Date: Mon, 7 Oct 2019 09:48:00 -0500 From: Tim Daneliuk <tundra@tundraware.com> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: sendmail/saslauthd Domain Blocking Message-ID: <2fc80d5e-0092-77b3-e6c1-f5bbb38e72fe@tundraware.com>
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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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