Email not delivered to downstream MTA (Email


Article ID: 184588


Updated On:


Data Loss Prevention Network Prevent for Email


When making telnet to port 25 to the email prevent server from upstream MTA getting the below error:
[Telnet] Fatal: Forwarding agent unavailable. Closing Connection


Error messages found in SMTP logs of detection server:

16/Apr/19:08:38:17:321+0300 [SEVERE] (SMTP_CONNECTION.5203) Forward connection error (tid=3f cid=b15a4fed-e11e-4e52-a6c9-8aae25c90103 reason=Connection refused: no further information)
16/Apr/19:08:38:17:321+0300 [SEVERE] (SMTP_CONNECTION.5210) All forward hosts unavailable (tid=3f cid=<> reason=No available forward hosts)


Try clearing DNS cache - often it resolves the issue.

If this doesn't help - contact support to check are there any issues on Email (aka Messagelabs) side as the problem might be related to communication on their side.