diff --git a/seed/relay-mail-client/funcs/relay_mail.py b/seed/relay-mail-client/funcs/relay_mail.py
index 967fc8a..e7d6870 100644
--- a/seed/relay-mail-client/funcs/relay_mail.py
+++ b/seed/relay-mail-client/funcs/relay_mail.py
@@ -3,6 +3,8 @@ from rougail.utils import normalize_family as _normalize_family
 
 
 def get_local_smtp_info(ip_smtp, infos, network_eth, normalize=False):
+    if ip_smtp is None:
+        return
     ip_smtp_o = _ip_address(ip_smtp)
     for idx, net in enumerate(network_eth):
         if ip_smtp_o in _ip_network(net):