--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -111,6 +111,8 @@ static ngx_command_t  ngx_mail_auth_http
 
 
 static ngx_mail_module_t  ngx_mail_auth_http_module_ctx = {
+    NULL,                                  /* protocol */
+
     NULL,                                  /* create main configuration */
     NULL,                                  /* init main configuration */
 
@@ -135,7 +137,6 @@ ngx_module_t  ngx_mail_auth_http_module 
 };
 
 
-static char       *ngx_mail_auth_http_protocol[] = { "pop3", "imap", "smtp" };
 static ngx_str_t   ngx_mail_auth_http_method[] = {
     ngx_string("plain"),
     ngx_string("plain"),
@@ -145,18 +146,6 @@ static ngx_str_t   ngx_mail_auth_http_me
 
 static ngx_str_t   ngx_mail_smtp_errcode = ngx_string("535 5.7.0");
 
-static ngx_uint_t  ngx_mail_start_states[] = {
-   ngx_pop3_start,
-   ngx_imap_start,
-   ngx_smtp_start
-};
-
-static ngx_mail_auth_state_pt  ngx_mail_auth_states[] = {
-   ngx_mail_pop3_auth_state,
-   ngx_mail_imap_auth_state,
-   ngx_mail_smtp_auth_state
-};
-
 
 void
 ngx_mail_auth_http_init(ngx_mail_session_t *s)
@@ -762,7 +751,8 @@ ngx_mail_auth_http_process_headers(ngx_m
                 return;
             }
 
-            if (s->passwd.data == NULL && s->protocol != NGX_MAIL_SMTP_PROTOCOL)
+            if (s->passwd.data == NULL
+                && s->protocol != NGX_MAIL_SMTP_PROTOCOL)
             {
                 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
                               "auth http server %V did not send password",
@@ -881,9 +871,11 @@ ngx_mail_auth_sleep_handler(ngx_event_t 
             return;
         }
 
-        s->mail_state = ngx_mail_start_states[s->protocol];
-        rev->handler = ngx_mail_auth_states[s->protocol];
+        cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
 
+        rev->handler = cscf->protocol->auth_state;
+
+        s->mail_state = 0;
         s->auth_method = NGX_MAIL_AUTH_PLAIN;
 
         c->log->action = "in auth state";
@@ -894,8 +886,6 @@ ngx_mail_auth_sleep_handler(ngx_event_t 
             return;
         }
 
-        cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
-
         ngx_add_timer(rev, cscf->timeout);
 
         if (rev->ready) {
@@ -1145,9 +1135,10 @@ static ngx_buf_t *
 ngx_mail_auth_http_create_request(ngx_mail_session_t *s, ngx_pool_t *pool,
     ngx_mail_auth_http_conf_t *ahcf)
 {
-    size_t      len;
-    ngx_buf_t  *b;
-    ngx_str_t   login, passwd;
+    size_t                     len;
+    ngx_buf_t                 *b;
+    ngx_str_t                  login, passwd;
+    ngx_mail_core_srv_conf_t  *cscf;
 
     if (ngx_mail_auth_http_escape(pool, &s->login, &login) != NGX_OK) {
         return NULL;
@@ -1157,6 +1148,8 @@ ngx_mail_auth_http_create_request(ngx_ma
         return NULL;
     }
 
+    cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
+
     len = sizeof("GET ") - 1 + ahcf->uri.len + sizeof(" HTTP/1.0" CRLF) - 1
           + sizeof("Host: ") - 1 + ahcf->host_header.len + sizeof(CRLF) - 1
           + sizeof("Auth-Method: ") - 1
@@ -1165,7 +1158,8 @@ ngx_mail_auth_http_create_request(ngx_ma
           + sizeof("Auth-User: ") - 1 + login.len + sizeof(CRLF) - 1
           + sizeof("Auth-Pass: ") - 1 + passwd.len + sizeof(CRLF) - 1
           + sizeof("Auth-Salt: ") - 1 + s->salt.len
-          + sizeof("Auth-Protocol: imap" CRLF) - 1
+          + sizeof("Auth-Protocol: ") - 1 + cscf->protocol->name.len
+                + sizeof(CRLF) - 1
           + sizeof("Auth-Login-Attempt: ") - 1 + NGX_INT_T_LEN
                 + sizeof(CRLF) - 1
           + sizeof("Client-IP: ") - 1 + s->connection->addr_text.len
@@ -1212,8 +1206,8 @@ ngx_mail_auth_http_create_request(ngx_ma
 
     b->last = ngx_cpymem(b->last, "Auth-Protocol: ",
                          sizeof("Auth-Protocol: ") - 1);
-    b->last = ngx_cpymem(b->last, ngx_mail_auth_http_protocol[s->protocol],
-                         sizeof("imap") - 1);
+    b->last = ngx_cpymem(b->last, cscf->protocol->name.data,
+                         cscf->protocol->name.len);
     *b->last++ = CR; *b->last++ = LF;
 
     b->last = ngx_sprintf(b->last, "Auth-Login-Attempt: %ui" CRLF,