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[65.25.53.210]) by smtp.googlemail.com with ESMTPSA id t9sm5577492iop.86.2019.10.07.10.30.06 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 07 Oct 2019 10:30:07 -0700 (PDT) Message-ID: <5D9B761F.2040007@gmail.com> Date: Mon, 07 Oct 2019 13:30:07 -0400 From: Ernie Luzar User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 To: Tim Daneliuk CC: FreeBSD Mailing List Subject: Re: sendmail/saslauthd Domain Blocking References: <2fc80d5e-0092-77b3-e6c1-f5bbb38e72fe@tundraware.com> In-Reply-To: <2fc80d5e-0092-77b3-e6c1-f5bbb38e72fe@tundraware.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 46n6tn1MqLz4KFF X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=twR5A1DE; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of luzar722@gmail.com designates 2607:f8b0:4864:20::d32 as permitted sender) smtp.mailfrom=luzar722@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RECEIVED_SPAMHAUS_PBL(0.00)[210.53.25.65.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2.3.d.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(0.00)[ip: (-4.60), ipnet: 2607:f8b0::/32(-2.54), asn: 15169(-2.14), country: US(-0.05)]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Oct 2019 17:30:09 -0000 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