I have mail relay controls locked down, but still spam servers can connect to my Domino server. For example, I have “.tw” in “Deny connections from the following SMTP internet hostnames/IP addresses:” of Configuration doc. However, spam servers from .tw can connect. Log is filled with “…net.tw connected. … Relay denied”. I would prefer to prevent their server from even connecting. Is this possible?
Subject: How can you block an SMTP server from even CONNECTING
Block them at the firewall. But then you’re just pushing the job of rejecting the connection upstream one link. If the firewall is on your end of your internet connection, that’s not doing much. If the firewall is on the ISP end, it will save you a tiny bit of bandwidth.
Subject: RE: How can you block an SMTP server from even CONNECTING
Great point. Thanks!
Subject: How can you block an SMTP server from even CONNECTING
I don’t think it’s possible to do using your current method. Reason being that the server has to connect to Domino in order for Domino to identify it as a source that it should deny. If it hasn’t managed to connect, how can Domino know it’s from a source it should deny?
It’s possible that your ISP may be able to do something, but I doubt it.
Subject: RE: How can you block an SMTP server from even CONNECTING
Great point. Thanks!