--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -40,7 +40,6 @@ struct ngx_mail_auth_http_ctx_s {
     ngx_mail_auth_http_handler_pt   handler;
 
     ngx_uint_t                      state;
-    ngx_uint_t                      hash;   /* no needed ? */
 
     u_char                         *header_name_start;
     u_char                         *header_name_end;
@@ -269,7 +268,7 @@ ngx_mail_auth_http_write_handler(ngx_eve
                 ngx_del_timer(wev);
             }
 
-            if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
+            if (ngx_handle_write_event(wev, 0) != NGX_OK) {
                 ngx_close_connection(c);
                 ngx_destroy_pool(ctx->pool);
                 ngx_mail_session_internal_server_error(s);
@@ -895,7 +894,7 @@ ngx_mail_auth_sleep_handler(ngx_event_t 
             return;
         }
 
-        if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
+        if (ngx_handle_read_event(rev, 0) != NGX_OK) {
             ngx_mail_close_connection(c);
         }
 
@@ -903,7 +902,7 @@ ngx_mail_auth_sleep_handler(ngx_event_t 
     }
 
     if (rev->active) {
-        if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
+        if (ngx_handle_read_event(rev, 0) != NGX_OK) {
             ngx_mail_close_connection(c);
         }
     }
@@ -915,7 +914,6 @@ ngx_mail_auth_http_parse_header_line(ngx
     ngx_mail_auth_http_ctx_t *ctx)
 {
     u_char      c, ch, *p;
-    ngx_uint_t  hash;
     enum {
         sw_start = 0,
         sw_name,
@@ -927,7 +925,6 @@ ngx_mail_auth_http_parse_header_line(ngx
     } state;
 
     state = ctx->state;
-    hash = ctx->hash;
 
     for (p = ctx->response->pos; p < ctx->response->last; p++) {
         ch = *p;
@@ -951,12 +948,10 @@ ngx_mail_auth_http_parse_header_line(ngx
 
                 c = (u_char) (ch | 0x20);
                 if (c >= 'a' && c <= 'z') {
-                    hash = c;
                     break;
                 }
 
                 if (ch >= '0' && ch <= '9') {
-                    hash = ch;
                     break;
                 }
 
@@ -968,7 +963,6 @@ ngx_mail_auth_http_parse_header_line(ngx
         case sw_name:
             c = (u_char) (ch | 0x20);
             if (c >= 'a' && c <= 'z') {
-                hash += c;
                 break;
             }
 
@@ -979,12 +973,10 @@ ngx_mail_auth_http_parse_header_line(ngx
             }
 
             if (ch == '-') {
-                hash += ch;
                 break;
             }
 
             if (ch >= '0' && ch <= '9') {
-                hash += ch;
                 break;
             }
 
@@ -1081,7 +1073,6 @@ ngx_mail_auth_http_parse_header_line(ngx
 
     ctx->response->pos = p;
     ctx->state = state;
-    ctx->hash = hash;
 
     return NGX_AGAIN;
 
@@ -1089,7 +1080,6 @@ done:
 
     ctx->response->pos = p + 1;
     ctx->state = sw_start;
-    ctx->hash = hash;
 
     return NGX_OK;
 
@@ -1112,7 +1102,7 @@ ngx_mail_auth_http_block_read(ngx_event_
     ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
                    "mail auth http block read");
 
-    if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
+    if (ngx_handle_read_event(rev, 0) != NGX_OK) {
         c = rev->data;
         s = c->data;
 
@@ -1166,6 +1156,7 @@ ngx_mail_auth_http_create_request(ngx_ma
                 + sizeof(CRLF) - 1
           + sizeof("Client-IP: ") - 1 + s->connection->addr_text.len
                 + sizeof(CRLF) - 1
+          + sizeof("Client-Host: ") - 1 + s->host.len + sizeof(CRLF) - 1
           + sizeof("Auth-SMTP-Helo: ") - 1 + s->smtp_helo.len
           + sizeof("Auth-SMTP-From: ") - 1 + s->smtp_from.len
           + sizeof("Auth-SMTP-To: ") - 1 + s->smtp_to.len
@@ -1220,12 +1211,19 @@ ngx_mail_auth_http_create_request(ngx_ma
 
     b->last = ngx_cpymem(b->last, "Client-IP: ", sizeof("Client-IP: ") - 1);
     b->last = ngx_copy(b->last, s->connection->addr_text.data,
-                         s->connection->addr_text.len);
+                       s->connection->addr_text.len);
     *b->last++ = CR; *b->last++ = LF;
 
+    if (s->host.len) {
+        b->last = ngx_cpymem(b->last, "Client-Host: ",
+                             sizeof("Client-Host: ") - 1);
+        b->last = ngx_copy(b->last, s->host.data, s->host.len);
+        *b->last++ = CR; *b->last++ = LF;
+    }
+
     if (s->auth_method == NGX_MAIL_AUTH_NONE) {
 
-        /* HELO / MAIL FROM / RCPT TO can't contain CRLF, no need to escape */
+        /* HELO, MAIL FROM, and RCPT TO can't contain CRLF, no need to escape */
 
         b->last = ngx_cpymem(b->last, "Auth-SMTP-Helo: ",
                              sizeof("Auth-SMTP-Helo: ") - 1);