550 5.7.1 Access to not allowed by rules

SMTP Error Codes

Server blocked user access by a blacklist filter/rule, or server blocked access from the originating server by HELO/EHLO Filter.

Review server black list filters and user rules or set a bypass item. Whitelist the originating server in HELO/EHLO filter, or remove it from blacklist, or create a Bypass.

Applies To

SMTP Error Codes

See Also