<p dir="ltr">Hi</p>
<p dir="ltr">Deploy Kerio Connect to listen on port on desperate box or on same Linux server. If behind a router, set destination Nat to forward to say port 26, Kerio Connect will listen on that, filter, score and forward mail to local host port 25. </p>
<p dir="ltr">Mail me if interested on further help. </p>
<div class="gmail_quote">On 22 Dec 2016 17:14, "Hezron Mwangi" <<a href="mailto:hmwangi@kenet.or.ke">hmwangi@kenet.or.ke</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000"><div>Dear Raphael,</div><div><br></div><div>Maybe you can try building a mail filtering gateway that filters your emails before forwarding them to your mail server. In the mail filtering gateway you can run:<br><br>postfix as your MTA and ensure you do spf checking.<br>postgrey which does greylisting.<br>clamav which does virus scanning.<br>spamassassin which scores emails and identifies spam.<br>MailScanner which is a Powerful virus/spam scanning framework for mail gateways.<br><br>In addition you can try:</div><div><br>pyzor which is a Collaborative, networked system to detect and block spam.<br>razor-agents which is a Distributed, collaborative, spam detection and filtering network.</div><div><br></div><div>Kind regards,<br>Hezron Mwangi.<br></div><div><br></div><hr id="m_-4740649536225944894zwchr"><div><b>From: </b>"David Njuki" <<a href="mailto:njukey@gmail.com" target="_blank">njukey@gmail.com</a>><br><b>To: </b><a href="mailto:afnog@afnog.org" target="_blank">afnog@afnog.org</a><br><b>Sent: </b>Wednesday, 21 December, 2016 18:39:56<br><b>Subject: </b>Re: [afnog] I am getting porn spam emails<br></div><div><br></div><div><div dir="ltr"><div class="gmail_extra"><span class="m_-4740649536225944894gmail-im" style="font-size:12.800000190734863px"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:#cccccc;border-left-style:solid;padding-left:1ex"><span class="m_-4740649536225944894gmail-m_-8568858263233392987gmail-">> I am getting porn spam mail everyday in my mail server. Each email<br>> are from different email addresses and domains. I have tried<br>> creating a filter, and I have tried reporting them as spam. I need<br>> to know how to stop receiving them.<br><br></span>There is no perfect solution against spam. To avoid *reading* it, the<br>best solution is a bayesian filter that you train. I use bogofilter<br>and I'm very happy with it (very few false positives and few false<br>negatives). But if you want to avoir *receiving* spam (because you<br>want to save not only human attention, but also bandwidth), this is<br>more complicated. Things that can help:<br><br>* reputable black lists. I say "reputable" because many lists are<br>badly managed. (I use mostly two Spamhaus lists, <a href="http://sbl-xbl.spamhaus.org/" rel="noreferrer" target="_blank">sbl-xbl.spamhaus.org</a><br>and <a href="http://xbl-xbl.spamhaus.org/" rel="noreferrer" target="_blank">xbl-xbl.spamhaus.org</a>.)<br><br>* greylisting (in my experience, it kills half of the spam before it<br>reaches your email server (RFC 6647 is a good reading). Some people<br>will claim it is useless because the spammers will adapt. Let them<br>trust their theory, I trust my practice.<br></blockquote><br></span><div style="font-size:12.800000190734863px">As an addition to greylisting, also make sure you postfix does sender verification at smtp time. Many spammers fail this test. </div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">Check how to enable here <a href="http://www.postfix.org/ADDRESS_VERIFICATION_README.html#sender_always" target="_blank">http://www.postfix.org/<wbr>ADDRESS_VERIFICATION_README.<wbr>html#sender_always</a></div>
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