annotate xml/en/docs/mail/ngx_mail_core_module.xml @ 1502:b628e042a15e

Documented "listen backlog=" in mail and stream.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 09 Jun 2015 14:40:14 +0300
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) 2006, 2007 Anton Yuzhaninov
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_mail_core_module"
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11 link="/en/docs/mail/ngx_mail_core_module.html"
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12 lang="en"
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13 rev="7">
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14
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15 <section id="summary">
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16
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17 <para>
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18 This module is not built by default, it should be
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19 enabled with
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20 the <literal>--with-mail</literal> configuration parameter.
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21 </para>
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22
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23 </section>
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24
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25
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
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30 worker_processes 1;
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31
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32 error_log /var/log/nginx/error.log info;
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33
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34 mail {
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35 server_name mail.example.com;
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36 auth_http localhost:9000/cgi-bin/nginxauth.cgi;
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37
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38 imap_capabilities IMAP4rev1 UIDPLUS IDLE LITERAL+ QUOTA;
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39
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40 pop3_auth plain apop cram-md5;
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41 pop3_capabilities LAST TOP USER PIPELINING UIDL;
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42
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43 smtp_auth login plain cram-md5;
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44 smtp_capabilities "SIZE 10485760" ENHANCEDSTATUSCODES 8BITMIME DSN;
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45 xclient off;
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46
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47 server {
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48 listen 25;
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49 protocol smtp;
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50 }
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51 server {
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52 listen 110;
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53 protocol pop3;
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54 proxy_pass_error_message on;
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55 }
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56 server {
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57 listen 143;
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58 protocol imap;
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59 }
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60 server {
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61 listen 587;
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62 protocol smtp;
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63 }
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64 }
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65 </example>
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66 </para>
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67
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68 </section>
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69
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70
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71 <section id="directives" name="Directives">
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72
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73 <directive name="listen">
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74 <syntax>
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75 <value>address</value>:<value>port</value>
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76 [<literal>ssl</literal>]
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77 [<literal>backlog</literal>=<value>number</value>]
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78 [<literal>bind</literal>]
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79 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>]
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80 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax>
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81 <default/>
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82 <context>server</context>
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83
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84 <para>
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85 Sets the <value>address</value> and <value>port</value> for the socket
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86 on which the server will accept requests.
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87 It is possible to specify just the port.
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88 The address can also be a hostname, for example:
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89 <example>
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90 listen 127.0.0.1:110;
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91 listen *:110;
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92 listen 110; # same as *:110
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93 listen localhost:110;
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94 </example>
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95 IPv6 addresses (0.7.58) are specified in square brackets:
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96 <example>
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97 listen [::1]:110;
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98 listen [::]:110;
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99 </example>
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100 UNIX-domain sockets (1.3.5) are specified with the “<literal>unix:</literal>”
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101 prefix:
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102 <example>
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103 listen unix:/var/run/nginx.sock;
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104 </example>
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105
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106 </para>
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107
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108 <para>
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109 Different servers must listen on different
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110 <value>address</value>:<value>port</value> pairs.
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111 </para>
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112
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113 <para>
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114 The <literal>ssl</literal> parameter allows specifying that all
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115 connections accepted on this port should work in SSL mode.
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116 </para>
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117
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118 <para>
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119 The <literal>listen</literal> directive
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120 can have several additional parameters specific to socket-related system calls.
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121 <list type="tag">
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122
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123 <tag-name>
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124 <literal>backlog</literal>=<value>number</value>
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125 </tag-name>
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126 <tag-desc>
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127 sets the <literal>backlog</literal> parameter in the
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128 <c-func>listen</c-func> call that limits
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129 the maximum length for the queue of pending connections (1.9.2).
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130 By default,
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131 <literal>backlog</literal> is set to -1 on FreeBSD, DragonFly BSD, and Mac OS X,
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132 and to 511 on other platforms.
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133 </tag-desc>
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134
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135 <tag-name>
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136 <literal>bind</literal>
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137 </tag-name>
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138 <tag-desc>
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139 this parameter instructs to make a separate <c-func>bind</c-func>
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140 call for a given address:port pair.
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141 The fact is that if there are several <literal>listen</literal> directives with
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142 the same port but different addresses, and one of the
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143 <literal>listen</literal> directives listens on all addresses
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144 for the given port (<literal>*:</literal><value>port</value>), nginx will
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145 <c-func>bind</c-func> only to <literal>*:</literal><value>port</value>.
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146 It should be noted that the <c-func>getsockname</c-func> system call will be
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147 made in this case to determine the address that accepted the connection.
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148 If the <literal>ipv6only</literal>
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149 or <literal>so_keepalive</literal> parameters
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150 are used then for a given
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151 <value>address</value>:<value>port</value> pair
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152 a separate <c-func>bind</c-func> call will always be made.
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153 </tag-desc>
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154
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155 <tag-name>
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156 <literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>
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157 </tag-name>
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158 <tag-desc>
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159 this parameter determines
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160 (via the <c-def>IPV6_V6ONLY</c-def> socket option)
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161 whether an IPv6 socket listening on a wildcard address <literal>[::]</literal>
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162 will accept only IPv6 connections or both IPv6 and IPv4 connections.
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163 This parameter is turned on by default.
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164 It can only be set once on start.
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165 </tag-desc>
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166
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167 <tag-name>
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168 <literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]
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169 </tag-name>
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170 <tag-desc>
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171 this parameter configures the “TCP keepalive” behavior
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172 for the listening socket.
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173 If this parameter is omitted then the operating system’s settings will be
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174 in effect for the socket.
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175 If it is set to the value “<literal>on</literal>”, the
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176 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket.
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177 If it is set to the value “<literal>off</literal>”, the
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178 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket.
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179 Some operating systems support setting of TCP keepalive parameters on
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180 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>,
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181 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options.
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182 On such systems (currently, Linux 2.4+, NetBSD 5+, and
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183 FreeBSD 9.0-STABLE), they can be configured
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184 using the <value>keepidle</value>, <value>keepintvl</value>, and
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185 <value>keepcnt</value> parameters.
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186 One or two parameters may be omitted, in which case the system default setting
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187 for the corresponding socket option will be in effect.
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188 For example,
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189 <example>so_keepalive=30m::10</example>
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190 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes,
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191 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default,
0a1c5a087556 Documented bind/ipv6only/ssl/so_keepalive in mail listen directive.
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192 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes.
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193 </tag-desc>
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194
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195 </list>
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196 </para>
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197
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198 </directive>
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199
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200
748
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201 <directive name="mail">
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202 <syntax block="yes"/>
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203 <default/>
95344046d2d8 Documented 'mail' directive.
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204 <context>main</context>
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205
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206 <para>
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207 Provides the configuration file context in which the mail server directives
748
95344046d2d8 Documented 'mail' directive.
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208 are specified.
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209 </para>
95344046d2d8 Documented 'mail' directive.
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210
95344046d2d8 Documented 'mail' directive.
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211 </directive>
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212
95344046d2d8 Documented 'mail' directive.
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213
664
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214 <directive name="protocol">
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215 <syntax>
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216 <literal>imap</literal> |
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217 <literal>pop3</literal> |
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218 <literal>smtp</literal></syntax>
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219 <default/>
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220 <context>server</context>
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221
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222 <para>
966
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diff changeset
223 Sets the protocol for a proxied server.
664
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224 Supported protocols are
8283b1048b27 Translated mail modules into English.
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225 <link doc="ngx_mail_imap_module.xml">IMAP</link>,
966
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diff changeset
226 <link doc="ngx_mail_pop3_module.xml">POP3</link>, and
664
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227 <link doc="ngx_mail_smtp_module.xml">SMTP</link>.
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228 </para>
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229
8283b1048b27 Translated mail modules into English.
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230 <para>
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parents:
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231 If the directive is not set, the protocol can be detected automatically
966
95c3c3bbf1ce Text review.
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diff changeset
232 based on the well-known port specified in the <link id="listen"/>
664
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233 directive:
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234 <list type="bullet">
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235
8283b1048b27 Translated mail modules into English.
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236 <listitem>
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237 <literal>imap</literal>: 143, 993
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238 </listitem>
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parents:
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239
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240 <listitem>
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241 <literal>pop3</literal>: 110, 995
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242 </listitem>
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parents:
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243
8283b1048b27 Translated mail modules into English.
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244 <listitem>
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245 <literal>smtp</literal>: 25, 587, 465
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246 </listitem>
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parents:
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247
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248 </list>
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249 </para>
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parents:
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250
8283b1048b27 Translated mail modules into English.
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251 <para>
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252 Unnecessary protocols can be disabled using the
924
a2aea48ff155 New "installation" article.
Ruslan Ermilov <ru@nginx.com>
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diff changeset
253 <link doc="../configure.xml">configuration</link>
664
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254 parameters <literal>--without-mail_imap_module</literal>,
1046
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diff changeset
255 <literal>--without-mail_pop3_module</literal>, and
664
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256 <literal>--without-mail_smtp_module</literal>.
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257 </para>
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258
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259 </directive>
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260
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261
1068
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262 <directive name="resolver">
0c5f8630fe40 Documented the mail "resolver" directive.
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263 <syntax>
0c5f8630fe40 Documented the mail "resolver" directive.
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264 <value>address</value> ...
0c5f8630fe40 Documented the mail "resolver" directive.
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265 [<literal>valid</literal>=<value>time</value>]</syntax>
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266 <syntax><literal>off</literal></syntax>
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267 <default>off</default>
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268 <context>mail</context>
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269 <context>server</context>
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270
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271 <para>
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272 Configures name servers used to find the client’s hostname
0c5f8630fe40 Documented the mail "resolver" directive.
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273 to pass it to the
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274 <link doc="ngx_mail_auth_http_module.xml">authentication server</link>,
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diff changeset
275 and in the
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276 <link doc="ngx_mail_proxy_module.xml" id="xclient">XCLIENT</link>
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277 command when proxying SMTP.
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278 For example:
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279 <example>
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280 resolver 127.0.0.1 [::1]:5353;
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281 </example>
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282 An address can be specified as a domain name or IP address,
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283 and an optional port (1.3.1, 1.2.2).
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284 If port is not specified, the port 53 is used.
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285 Name servers are queried in a round-robin fashion.
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286 <note>
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287 Before version 1.1.7, only a single name server could be configured.
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288 Specifying name servers using IPv6 addresses is supported
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289 starting from versions 1.3.1 and 1.2.2.
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290 </note>
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291 By default, nginx caches answers using the TTL value of a response.
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292 An optional <literal>valid</literal> parameter allows overriding it:
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293 <example>
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294 resolver 127.0.0.1 [::1]:5353 valid=30s;
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295 </example>
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296 <note>
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297 Before version 1.1.9, tuning of caching time was not possible,
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298 and nginx always cached answers for the duration of 5 minutes.
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299 </note>
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300 </para>
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301
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302 <para>
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303 The special value <literal>off</literal> disables resolving.
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304 </para>
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305
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306 </directive>
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307
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308
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309 <directive name="resolver_timeout">
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310 <syntax><value>time</value></syntax>
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311 <default>30s</default>
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312 <context>mail</context>
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313 <context>server</context>
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314
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315 <para>
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316 Sets a timeout for DNS operations, for example:
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317 <example>
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318 resolver_timeout 5s;
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319 </example>
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320 </para>
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321
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322 </directive>
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323
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324
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325 <directive name="server">
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326 <syntax block="yes"/>
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327 <default/>
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328 <context>mail</context>
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329
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330 <para>
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331 Sets the configuration for a server.
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332 </para>
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333
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334 </directive>
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335
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336
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337 <directive name="server_name">
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338 <syntax><value>name</value></syntax>
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339 <default>hostname</default>
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340 <context>mail</context>
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341 <context>server</context>
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342
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343 <para>
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344 Sets the server name that is used:
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345 <list type="bullet">
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346
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347 <listitem>
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348 in the initial POP3/SMTP server greeting;
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349 </listitem>
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350
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351 <listitem>
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352 in the salt during the SASL CRAM-MD5 authentication;
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353 </listitem>
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354
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355 <listitem>
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356 in the <literal>EHLO</literal> command when connecting to the SMTP backend,
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357 if the passing of the
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358 <link doc="ngx_mail_proxy_module.xml" id="xclient">XCLIENT</link> command
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359 is enabled.
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360 </listitem>
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361
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362 </list>
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363 </para>
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364
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365 <para>
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366 If the directive is not specified, the machine’s hostname is used.
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367 </para>
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368
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369 </directive>
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370
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371
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372 <directive name="timeout">
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373 <syntax><value>time</value></syntax>
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374 <default>60s</default>
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375 <context>mail</context>
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376 <context>server</context>
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377
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378 <para>
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379 Sets the timeout that is used before proxying to the backend starts.
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380 </para>
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381
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382 </directive>
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383
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384 </section>
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385
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386 </module>