sendmail/saslauthd Domain Blocking
tundra at tundraware.com
Mon Oct 7 14:48:19 UTC 2019
I block unwanted domains from sending mail to one of our servers by
putting it on the reject list in /etc/mail/access.
I am seeing distributed brute force attempts to use that same
server as a relay. These are coming from a few domains.
So far, these attempts have failed but I'd like to be proactive in
preventing future such intrusions.
Is there an equivalent way to block entire domains and/or subdomains
from ever even connecting to saslauthd?
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