--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -73,16 +73,16 @@ static ngx_command_t  ngx_mail_ssl_comma
 
     { ngx_string("ssl_certificate"),
       NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
-      ngx_conf_set_str_slot,
+      ngx_conf_set_str_array_slot,
       NGX_MAIL_SRV_CONF_OFFSET,
-      offsetof(ngx_mail_ssl_conf_t, certificate),
+      offsetof(ngx_mail_ssl_conf_t, certificates),
       NULL },
 
     { ngx_string("ssl_certificate_key"),
       NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
-      ngx_conf_set_str_slot,
+      ngx_conf_set_str_array_slot,
       NGX_MAIL_SRV_CONF_OFFSET,
-      offsetof(ngx_mail_ssl_conf_t, certificate_key),
+      offsetof(ngx_mail_ssl_conf_t, certificate_keys),
       NULL },
 
     { ngx_string("ssl_password_file"),
@@ -238,8 +238,6 @@ ngx_mail_ssl_create_conf(ngx_conf_t *cf)
      * set by ngx_pcalloc():
      *
      *     scf->protocols = 0;
-     *     scf->certificate = { 0, NULL };
-     *     scf->certificate_key = { 0, NULL };
      *     scf->dhparam = { 0, NULL };
      *     scf->ecdh_curve = { 0, NULL };
      *     scf->client_certificate = { 0, NULL };
@@ -251,6 +249,8 @@ ngx_mail_ssl_create_conf(ngx_conf_t *cf)
 
     scf->enable = NGX_CONF_UNSET;
     scf->starttls = NGX_CONF_UNSET_UINT;
+    scf->certificates = NGX_CONF_UNSET_PTR;
+    scf->certificate_keys = NGX_CONF_UNSET_PTR;
     scf->passwords = NGX_CONF_UNSET_PTR;
     scf->prefer_server_ciphers = NGX_CONF_UNSET;
     scf->verify = NGX_CONF_UNSET_UINT;
@@ -290,8 +290,9 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
     ngx_conf_merge_uint_value(conf->verify, prev->verify, 0);
     ngx_conf_merge_uint_value(conf->verify_depth, prev->verify_depth, 1);
 
-    ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
-    ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
+    ngx_conf_merge_ptr_value(conf->certificates, prev->certificates, NULL);
+    ngx_conf_merge_ptr_value(conf->certificate_keys, prev->certificate_keys,
+                         NULL);
 
     ngx_conf_merge_ptr_value(conf->passwords, prev->passwords, NULL);
 
@@ -328,7 +329,7 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
 
     if (*mode) {
 
-        if (conf->certificate.len == 0) {
+        if (conf->certificates == NULL) {
             ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                           "no \"ssl_certificate\" is defined for "
                           "the \"%s\" directive in %s:%ui",
@@ -336,7 +337,7 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
             return NGX_CONF_ERROR;
         }
 
-        if (conf->certificate_key.len == 0) {
+        if (conf->certificate_keys == NULL) {
             ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                           "no \"ssl_certificate_key\" is defined for "
                           "the \"%s\" directive in %s:%ui",
@@ -344,17 +345,31 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
             return NGX_CONF_ERROR;
         }
 
+        if (conf->certificate_keys->nelts < conf->certificates->nelts) {
+            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
+                          "no \"ssl_certificate_key\" is defined "
+                          "for certificate \"%V\" and "
+                          "the \"ssl\" directive in %s:%ui",
+                          ((ngx_str_t *) conf->certificates->elts)
+                          + conf->certificates->nelts - 1,
+                          conf->file, conf->line);
+            return NGX_CONF_ERROR;
+        }
+
     } else {
 
-        if (conf->certificate.len == 0) {
+        if (conf->certificates == NULL) {
             return NGX_CONF_OK;
         }
 
-        if (conf->certificate_key.len == 0) {
+        if (conf->certificate_keys == NULL
+            || conf->certificate_keys->nelts < conf->certificates->nelts)
+        {
             ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                           "no \"ssl_certificate_key\" is defined "
                           "for certificate \"%V\"",
-                          &conf->certificate);
+                          ((ngx_str_t *) conf->certificates->elts)
+                          + conf->certificates->nelts - 1);
             return NGX_CONF_ERROR;
         }
     }
@@ -371,8 +386,8 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
     cln->handler = ngx_ssl_cleanup_ctx;
     cln->data = &conf->ssl;
 
-    if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
-                            &conf->certificate_key, conf->passwords)
+    if (ngx_ssl_certificates(cf, &conf->ssl, conf->certificates,
+                             conf->certificate_keys, conf->passwords)
         != NGX_OK)
     {
         return NGX_CONF_ERROR;