Overview
When GFI MailEssentials is installed as a relay server, the Message Delivery Log on the recipient mail server which gets the emails from the relay server shows in the Status Reply:
550 5.7.1 Recipient not authorized, your IP has been found on a block list
Environment
- GFI MailEssentials
- All supported environments
Root Cause
The Sender Reputation was enabled on the recipient mail server and is blocking the email.
Resolution
The Sender Reputation has been enabled on the mail server. This configuration is incompatible with GFI MailEssentials as a relay server. All filtering should take place on the GFI MailEssentials server, not on the receiving mail server. For more information on Sender Reputation and how to disable it, please see the following:
If the mail server is a Microsoft Exchange 2007 server:
If the mail server is an Exchange 2010:
If the mail server is Exchange 2013 and later: