Mailing List Message #106913
From: DUDLEY Paul <>
Subject: 550 server without authentication error
Date: Wed, 1 Aug 2018 03:04:40 +0000
To: <>

We are using CommuniGate version 6.2.0. We have the outgoing SMTP setting set to send directly to the recipient.

Some emails are failing to be sent because of a “550 server without authentication error” refusal by the destination mail server.

What can I check as far as SMTP authentication goes within CommuniGate that may fix this problem?

I have only seen it so far with one destination mail domain.



Paul Dudley

0412 257 603



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