1 files changed, 8 insertions, 2 deletions
diff --git a/src/mail/ngx_mail_smtp_handler.c b/src/mail/ngx_mail_smtp_handler.c
index 2d7c24f56..6e944738f 100644
--- a/src/mail/ngx_mail_smtp_handler.c
+++ b/src/mail/ngx_mail_smtp_handler.c
@@ -54,10 +54,16 @@ ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
     ngx_resolver_ctx_t        *ctx;
     ngx_mail_core_srv_conf_t  *cscf;
 
-    c->log->action = "in resolving client address";
-
     cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
 
+    if (cscf->resolver == NULL) {
+        s->host = smtp_unavailable;
+        ngx_mail_smtp_greeting(s, c);
+        return;
+    }
+
+    c->log->action = "in resolving client address";
+
     ctx = ngx_resolve_start(cscf->resolver, NULL);
     if (ctx == NULL) {
         ngx_mail_close_connection(c);