submission-login: submission-proxy - Avoid sending empty XCLIENT FORWARD field.

diff --git a/src/submission-login/submission-proxy.c b/src/submission-login/submission-proxy.c
index a148318ee1e8fd9b5b3c9f7b63941f09cf4a89a6..db84ef737efe8dc1ec7d7796e9b16cfeb4b1b02e 100644 (file)
--- a/src/submission-login/submission-proxy.c
+++ b/src/submission-login/submission-proxy.c
@@ -38,6 +38,8 @@ proxy_compose_xclient_forward(struct submission_client *client)
                        str_append_tabescaped(str, (*arg)+8);
                }
        }
+       if (str_len(str) == 0)
+               return NULL;
 
        return t_base64_encode(0, 0, str_data(str), str_len(str));
 }