skeating last edited by
I have recently had a problem with my firewall IP showing up on MXToolbox blocklists. The firewall is in front of a mail server. Interestingly, the mail server IP itself, or the domain names do not show up as being blocked. Is there something I can do to prevent this in the future?
KOM last edited by
This isn't a pfSense issue. Properly configure and secure your mail server. Do not configure it as an open relay. You're on a blocklist because your IP address was reported as a source of spam or malware. Is it possible that your IP address was previous used by someone else before you got it? This is common with VPS hosts, for example.
This is another great site for Mail Server Blocklist validation:
If you have your mail server on a separate WAN IP then your main WAN IP, then it looks like a device on your LAN was caught sending SPAM…
Create some firewall block rules to block all outbound MAIL ports from your main WAN IP network... Enable logging, and see if you get any hits on that... Then cleanup the infected LAN device(s)...