Date: Mon, 07 Oct 2019 13:30:07 -0400 From: Ernie Luzar <luzar722@gmail.com> To: Tim Daneliuk <tundra@tundraware.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: sendmail/saslauthd Domain Blocking Message-ID: <5D9B761F.2040007@gmail.com> In-Reply-To: <2fc80d5e-0092-77b3-e6c1-f5bbb38e72fe@tundraware.com> References: <2fc80d5e-0092-77b3-e6c1-f5bbb38e72fe@tundraware.com>
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Tim Daneliuk wrote: > 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? Look at port dns2blackhole
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