Hi guys,
I used SMG 10.7.5-292. I noticed something interest today. We use DNS authentication.
You can see if this works by typing the relevant IP address in the Connection IP section in the logs as Reject by MTA.
Actively used DNS validations:
- Reject connections where no reverse DNS record exists for the connecting IP address.
- Reject connections where the domain provided at HELO and EHLO has neither an 'A', nor an 'AAAA', nor an 'MX' record in DNS
- Reject messages where the domain provided in the MAIL FROM address has neither an 'A', nor an 'AAAA', nor an 'MX' record in DNS
When I look at the logs by making an IP-based filter, I see both blocked and delivered mails within 10 minutes.
How is this possible?