Overview
When GFI MailEssentials is installed as a Simple Mail Transfer Protocol (SMTP) relay and trying to deliver the emails to the mail server, the Message Delivery Log of the mail server shows in the Status Reply:
550 5.7.1 Message rejected as spam by Content Filtering
Environment
- GFI MailEssentials
- All supported environments
Root Cause
Content Filtering was enabled on the mail server and is blocking emails.
Resolution
Content Filtering has been enabled on the recipient's mail server. This configuration is incompatible with GFI MailEssentials installed as a relay server, all email filterings should happen on the relay server. For more information Content Filtering and how to disable it, please see the following:
If the mail server is Microsoft Exchange 2007 server:
If the mail server is Microsoft Exchange 2010 server:
If the mail server is Microsoft Exchange 2013 and 2016 server: