NethServer Version: 7.9.2009
We setup Email on our Nethserver and we’ve begun experiencing the following problems:
- We use a third part spam filter service and their spam filter uses “verify receiver” with option 550. This means that before email is sent to us our spam filter service verifies the email address to ensure it is legit. This means my Nethserver needs to reply back to our spam service. That reply is over port 25 and was working up to earlier today. At some point this morning this reply stopped thereby causing our spam service provider to stop sending us emails. We’ve mitigated this by our spam service provider has turned off this verification check which allows mail to flow through now.
Where in Nethserver can I check to see why this reply is not being sent back any longer?