Category: mail
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Spam to aol.com
Some open relay spams a lot with this kind of messages: Delivered-To: abondarenko@gmail.com Received: by 2002:aa6:c2c8:0:b0:16a:1e8a:2c54 with SMTP id i8csp1735690lkp; Fri, 17 Dec 2021 09:01:32 -0800 (PST) X-Google-Smtp-Source: ABdhPJwYX2tMoVU+eJjTP1qslWMcUikk61IbaTmPrak3WWvb1fbofSlY0ftgYqX9WBAiH5rL/PIy X-Received: by 2002:a2e:bf1e:: with SMTP id c30mr3535718ljr.408.1639760491902; Fri, 17 Dec 2021 09:01:31 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1639760491; cv=none; d=google.com; s=arc-20160816; b=Pp3pD2GTGMOH8vYn+zs+n31Y3/RsUhm8SrzMWHMf4MAqnnojNhRemwUANtHgYhjd/9 M9F2iuIpJkYkdd5SqyzP2623PIWs8ahgMoEWWU5s9exmqAhICUtDc0BODLwWpzw1pbYi +XoA0yQkL79W+wWdCnn2D+EGR1LCr2dxnrH4A3OgsTTXG573/yQ3fAxMvT/qdSTCHf+X VtaHKSEHgU5vkfo20EF6hKF9h46d/KyaMspGtr4XhVeUPgvl3EWf/LilXOnbcctYH+q7 Q2ys7jcbeyltrTxwhVhJAy0gUu2ozZvSYh1SqR5MeWSbIb5/ClGinRy5cg5nimLi2jig…
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Postfix and greylisting
Spam became a noticeable threat for the mail servers many years ago. No servers today could be running without being hardened against the spam: according to some reports up to 75% of all the email traffic is spam. It’s noticeable from network capacity, hardware and electricity consumption even if you run a small company mail…
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Postfix mail server with DKIM
Installation and configuration of the mail server (Mail Transfer Agent, MTA) is one of the typical tasks any system administrator faces. Here we will cover the task and by the end of the article will have CentOS 7 with Postfix mail server that listens to he 25 port (SMTP) and delivers messages for the selected…
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OK Google Mail!
Starting around 11 April Gmail started to mess with the TLS. If in the “send as” settings you had anything in the MX hostname, that does not match what’s going on after your @ and your cert, your mail server got a reject, even if his origin matches the certificate. I had ‘mx.andreybondarenko.com’, had to…
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Google group calendars in Evolution Mail
If your organization uses Google Apps as mail service but you are using Evolution, there is no evident way to view and edit shared group calendars until recent versions. To add group calendar you need: go to calendar settings on web Calendar Address: -> ID (somenting like example.com_1d32345331343234213832@resource.calendar.google.com) Evolution -> New Calendar -> Google User name -> this ID Auth with usual name-pass…
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DKIM=temperror
Recently I have checked my messages headers of the mail that comes from the andreybondarenko.com MX and found that Google shows that my DKIM signature is invalid: In the spam score section: However the header itself is present: I have found that it’s quite common configuration error of the OpenDKIM, the selector you choose to store key can be chosen randomly, but the TXT record should match /etc/opendkim.conf.…
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Evolution mail signature workaround
Evolution mail application in the Fedora 25 has annoying bug: it freezes when trying to add/edit signature (although, you can delete old one). It’s a known bug fixed in upstream and you can actually edit signature files (it’s quite tricky), but you can add shell script that would generate signature for you. UPD: need to use “cowsay `fortune`”
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DNSBL checkers list
Since I am now running my own smtp-server, I have to deal with different black list servers myself and check my IP from time to time if it’s there or not.To cover pretty much everything valuable: https://www.whatismyip.com/blacklist-check/http://whatismyipaddress.com/blacklist-checkhttp://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a85.17.249.170&run=toolpage My IP was in 2 lists, DAN ME, APEWS and Barracuda. DAN ME is a list maintained by some loser, who lists there all TOR-related IP addresses…