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#postfix

2 messages2 participants0 message aujourd’hui
Andreas Gohr<p>I spent a lot of time getting <a href="https://fedi.splitbrain.org/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a> to work with an external relay on <a href="https://fedi.splitbrain.org/tags/nixos" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nixos</span></a> today.<br><br><a href="https://www.splitbrain.org/blog/2025-07/25-postfix_relay_to_smtp2go_on_nixos" rel="nofollow noopener noreferrer" target="_blank">https://www.splitbrain.org/blog/2025-07/25-postfix_relay_to_smtp2go_on_nixos</a><br><br><a href="https://fedi.splitbrain.org/tags/blogpost" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>blogpost</span></a> <a href="https://fedi.splitbrain.org/tags/smtp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>smtp</span></a> <a href="https://fedi.splitbrain.org/tags/mail" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mail</span></a> <a href="https://fedi.splitbrain.org/tags/smtp2go" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>smtp2go</span></a></p>
Bruce Heerssen<p>I don't understand. Dovecot refuses to issue the correct SSL cert. I've checked and triple checked the file name in /etc/dovecot/conf.d/10-ssl.conf. I've restarted the service multiple times and even rebooted.</p><p>Apache issues the correct cert. They are using the exact same files.</p><p>perplexing.</p><p>CLI command to check dovecot:<br>openssl s_client -connect mail.heerssen.net:465</p><p>And Apache<br>openssl s_client -connect mail.heerssen.net:443</p><p><a href="https://darkmoon.social/tags/Postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Postfix</span></a> <a href="https://darkmoon.social/tags/dovecot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>dovecot</span></a> <a href="https://darkmoon.social/tags/ServerAdmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ServerAdmin</span></a> <a href="https://darkmoon.social/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linux</span></a></p>
Stumpi im Retroland<p><span class="h-card" translate="no"><a href="https://cultur.social/@marcuwekling" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>marcuwekling</span></a></span> Großartige Idee! Ich bin (eh schon) dabei! 🙃 <a href="https://c64.social/tags/dutgemacht" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>dutgemacht</span></a> <a href="https://c64.social/tags/ididit" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ididit</span></a> </p><p>Hier was ich derzeit schon so nutze:</p><p>- Eigener Mailserver <a href="https://c64.social/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a> <a href="https://c64.social/tags/clamav" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>clamav</span></a> <a href="https://c64.social/tags/rspamd" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rspamd</span></a> <a href="https://c64.social/tags/roundcubemail" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>roundcubemail</span></a> <a href="https://c64.social/tags/dovecot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>dovecot</span></a> <br>- Notebooks auf <a href="https://c64.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linux</span></a><br>- <a href="https://c64.social/tags/pfsense" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pfsense</span></a> Firewall <br>- <a href="https://c64.social/tags/thunderbird" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>thunderbird</span></a> </p><p>Selber gehostete freie Dienste/Software derzeit:<br>- <a href="https://c64.social/tags/Nextcloud" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Nextcloud</span></a><br>- <a href="https://c64.social/tags/PaperlessNGX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PaperlessNGX</span></a> <br>- <a href="https://c64.social/tags/Peertube" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Peertube</span></a> <br>- <a href="https://c64.social/tags/HomeAssistant" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>HomeAssistant</span></a> <br>- <a href="https://c64.social/tags/Mastodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Mastodon</span></a> <br>- <a href="https://c64.social/tags/Matrix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Matrix</span></a> <br>- <a href="https://c64.social/tags/Wordpress" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Wordpress</span></a> </p><p>Fremdgehostete freie Dienste:<br>- <a href="https://c64.social/tags/pixelfed" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pixelfed</span></a> <br>- <a href="https://c64.social/tags/bigbluebutton" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>bigbluebutton</span></a> <br>- <a href="https://c64.social/tags/letsencrypt" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>letsencrypt</span></a> </p><p>Leider kann ich meinen Windowsrechner noch nicht loswerden <a href="https://c64.social/tags/gamer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gamer</span></a> - aber das kommt bestimmt auch noch irgendwann... 🤞</p>
rixx<p>because running a mail server wasn’t fun enough: the Dovecot 2.3 → 2.4 update has tons of breaking config changes</p><p>(h/t to <a href="https://willem.com/blog/2025-06-04_breaking-changes/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">willem.com/blog/2025-06-04_bre</span><span class="invisible">aking-changes/</span></a> for the exhaustive breakdown of the changes)</p><p><a href="https://chaos.social/tags/mailadmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mailadmin</span></a> <a href="https://chaos.social/tags/dovecot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>dovecot</span></a> <a href="https://chaos.social/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a> <a href="https://chaos.social/tags/sysadmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sysadmin</span></a></p>
Brook Miles<p>I have succeeded in configuring both Cyrus IMAP and Postfix to authenticate using an LLDAP server. Please clap.</p><p><a href="https://sunny.garden/tags/CyrusIMAP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CyrusIMAP</span></a> <a href="https://sunny.garden/tags/Postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Postfix</span></a></p>
kazé<p>I have a <a href="https://mastodon.social/tags/SysAdmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SysAdmin</span></a> question: is it okay to use a local, loopback-only SMTP server (<a href="https://mastodon.social/tags/mailutils" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mailutils</span></a> + <a href="https://mastodon.social/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a>) to allow a local web app to send mails directly? Without any login/passwd?</p><p>This works fine:<br> echo [boty] | mail -s [subject] [dest]</p><p>But I can’t make it work from my app (<a href="https://mastodon.social/tags/ApacheAnswer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ApacheAnswer</span></a>), even though it does have an unauthenticated mode for SMTP. What am I missing?</p>
René's old blog<p><strong>Sending newsletters in bulk</strong></p><p>Full post here. <a href="https://rene.seindal.dk/2025/06/17/sending-newsletters-in-bulk/" class="" rel="nofollow noopener noreferrer" target="_blank">https://rene.seindal.dk/2025/06/17/sending-newsletters-in-bulk/</a></p><p></p><p>I have a newsletter — <a href="https://venetianstories.com/newsletter/" rel="nofollow noopener noreferrer" target="_blank">Venetian Stories</a> about the history of Venice — with a couple of hundred recipients.</p><p>For some time, I have managed that with a free WordPress plugin. One of those with a PRO version, and every update shifted some functionality over to the paid version.</p><p>When I wanted to move the newsletter from my <a href="https://historywalksvenice.com/" rel="nofollow noopener noreferrer" target="_blank">History Walks Venice</a> site to a dedicated domain, there was no way of migrating the plugin data without moving to the PRO version. Several functions I had used for a long time, were no only available for payment.</p><p>Confronted with these futile complications, I decided to return to basics.</p><p>The newsletters would be sent from my mail application of choice, as HTML emails, with all the recipients in the BCC field.</p><p></p><p><a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://rene.seindal.dk/tag/bulk-mail/" target="_blank">#BulkMail</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://rene.seindal.dk/tag/mail-in-a-box/" target="_blank">#MailInABox</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://rene.seindal.dk/tag/postfix/" target="_blank">#Postfix</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://rene.seindal.dk/tag/venetian-stories/" target="_blank">#VenetianStories</a></p>
Jan Wildeboer 😷:krulorange:<p><a href="https://social.wildeboer.net/tags/NerdSpeak" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NerdSpeak</span></a> Some mail senders are exposing internal, non-resolving host names in the EHLO/HELO phase when sending mails, causing my mail server to (correctly) refuse them. However, in some cases I have to begrudgingly accept their broken config as the mails they send are actually legitimate and important. Looking at you, Drillisch Online. Fix your shit. Anyway, here's how I did it on my <a href="https://social.wildeboer.net/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a> server: <a href="https://codeberg.org/jwildeboer/gists/src/branch/main/2025/20250615HELOAllowlistPostfix.md" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">codeberg.org/jwildeboer/gists/</span><span class="invisible">src/branch/main/2025/20250615HELOAllowlistPostfix.md</span></a></p><p>1/3</p>
Brook Miles<p>Against all odds I have configured a test Cyrus IMAP + Postfix server that both sends and receives email. :goose_hacker: </p><p>It's jank as heck, and absolutely not a useful production setup, but it does "work", and only took 3 hours.</p><p><a href="https://sunny.garden/tags/CyrusIMAP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CyrusIMAP</span></a> <a href="https://sunny.garden/tags/Postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Postfix</span></a></p>
David Chisnall (*Now with 50% more sarcasm!*)<p>Any <a href="https://infosec.exchange/tags/postfix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postfix</span></a> users know how to configure <code>smtp_tls_wrappermode = yes</code> for sending via a single relay, but not use it for others? I have things set up to relay via my outbound SMTP server to a few mail servers that all want STARTTLS over port 587, but now I want to add one that wants SMTPS over port 465. If I don't set <code>smtp_tls_wrappermode = yes</code>, it refuses to connect to the new server. If I do set it, it refuses to connect to the existing ones. There are some hints in the documentation that you can use <code>transport_maps</code> in some way, but I can't figure out how.</p>

Y-en-a-t-il parmi vous qui ont mis en place dans #postfix un système de liste blanche de correspondants par utilisateur.

On a des clients qui utilisent Mailinblack et qui apprécient le système de captcha envoyé automatiquement en réponse aux expéditeurs inconnus.

Il doit y avoir moyen de faire quelque chose de similaire avec milter et/ou sieve

Nos boites mails sont administrées avec ISPConfig

Just going through the logs of my own mail server (Thanks, @mwl !) to extend my #postfix #fail2ban #regexp to ban hosts with too many unsuccesful login attempts. Knowing the user name pattern (example.com only letters, others with at least one dot) I came up with

'warning: .*\[<HOST>\]: SASL LOGIN authentication failed: .*sasl_username=<F-USER>(?:[^.]*@(?!example\.com)|[^.]*\.[^.]*@(?:example\.com))</F-USER>'

This works great.