I found DKIM error in setup on my mail server. dmarcian.com had a DKIM validator. SPF and DMARC had to be setup OK on DNS too. I can now email from my domain to outlook.com without it bouncing or being dropped. #email #dkim #spf #dmarc #microsoft #outlook #hotmail #dns #block #opendkim #postfix
#spf
uhh #Procmail ist ja echt kryptisch. Aber hab doch hinbekommen zu fixen bei #SmartList. Das wurde wohl noch vor #SPF geschrieben. Heute ist wichtig, dass From korrekt ist und Ursprungssender lieber in Reply-To packen.
#DKIM #DMARC #SPF
Autres spams du jour : deux messages prétendant venir d'Atlassian (la boite favorite des chefs de projet et product owners), l'un créant un ticket Vinci et un autre un ticket Bouygues. (Avec une signature DKIM invalide mais ça peut toujours passer, on ne sait jamais. Le spammeur a pensé à insérer un Authentication-Results mensonger.)
Eine neue #Episode des #Zeroday#Podcast ist #online: 0d130 – Der Wunsch Mail-Provider
Link zur Episode: https://0x0d.de/2026/01/0d130-der-wunsch-mail-provider/
@zeroday@podcasts.social (Stefan)
@zeroday (Sven)
#Datenschutz #DKIM #DMARC #EMail #IMAP #Informationssicherheit #ITSecurity #ITSicherheit #POP3 #privacy #Privatsphäre #SMTP #SPF
#selflart für Fortgeschrittene.
#email #spf
Mails können out of the blue nicht mehr an einige Empfänger zugestellt werden, in den Bounces steht was von DMARC-Fehlern. Alle Online-Tools sagen: "Dein DMARC ist OK"
Natürlich habe ich einen SPF-Record. Und da ich rührige Abteilungen habe, die dauernd irgendwelche Dienstleister anschleppen, muß der ständig um neue Includes erweitert werden, der ist schon jetzt komplett kaum noch lesbar.
Es muß also ein weiterer Dienstleister inkludiert werden. Kein Ding, einfach den Record erweitern: iinclude:spf.example.com Ja, ihr seht es sofort, ich habe es nicht gesehen. Das macht sofort den SPF ungültig, und damit natürlich auch DMARC.
Möchte jemand ein i kaufen?
RFC 9815: BGP Link-State Shortest Path First Routing
Vous le savez (peut-être), le protocole de #routage #BGP est du type « vecteur de chemin ». Mais il peut aussi transporter des états des liens, si on souhaite faire des choses plus proches des protocoles à état des liens. Ce #RFC décrit comment, avec ces informations sur l'état des liens, décider du routage par l'algorithme #SPF (Shortest Path First) plutôt que par la méthode traditionnelle de BGP.
Hit me right in the impostor syndrome: after years of working with #SPF, I just learned that it doesn't validate the "From:" address, but (de facto) the "Return-Path:"
Which makes it pretty easy to circumvent by phishers. Only DMARC can prevent this.
How to Deploy #Mailman Suite on #Debian #VPS for Automated Mailing List Management This article provides a detailed step-by-step guide demonstrating how to deploy Mailman Suite on Debian VPS for automated mailing list management. Mailman Suite includes Mailman Core, #Postorius (web UI), #HyperKitty (archiver), and the Mailman Web UI integration.
What is Mailman Suite? ...
Continued 👉 https://blog.radwebhosting.com/deploy-mailman-suite-on-debian-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.raddemo.host #dkim #opensource #django #opendkim #dmarc #spf #selfhosting #reverseproxy #selfhosted
It’s official and we are proud as hell! 😎
sys4 will send 3 of its experts to work at the EU commissions’ Multistakeholder Forum on Internet Standards Deployment „to guide deployment of key Internet standards under NIS2 network security measures and promote wider industry uptake.“
We - @cstrotm (DNS / DNSSEC), Gert Doering (IPv6, RPKI) and @patrickbenkoetter (TLS, DANE, MTA-STS, SPF, DKIM, DMARC) - will work on recommendations and best practices.
Our intent is to recommend what’s reasonable for customer security on the Internet and we expect the one or the other company to disagree for economic reasons. Like they have disagreed since we started to talk with them more than 10 years ago. And the market didn’t fix it. Well… let’s see if working in the Forum will do the trick.
https://digital-strategy.ec.europa.eu/en/news/european-commission-seeks-participants-multi-stakeholder-forum-internet-standards-deployment
#dns #dnssec #ipv6 #rpki #tls #dane #mtasts #spf #dkim #dmarc
A Major Mail Provider Demonstrate They Likely Do Not Understand Mail At All https://nxdomain.no/~peter/they_do_not_understand_mail_at_all.html (tracked https://bsdly.blogspot.com/2026/01/a-major-mail-provider-demonstrate-they.html)
#greytrapping #spam, #antispam #greylisting #blocklist, #openbsd #freebsd #smtp #email #SMTP, #contentfiltering #SPF #DMARC #security #networking @nostarch
How to Deploy #Mailman Suite on #Debian #VPS for Automated Mailing List Management This article provides a detailed step-by-step guide demonstrating how to deploy Mailman Suite on Debian VPS for automated mailing list management. Mailman Suite includes Mailman Core, #Postorius (web UI), #HyperKitty (archiver), and the Mailman Web UI integration.
What is Mailman Suite? ...
Continued 👉 https://blog.radwebhosting.com/deploy-mailman-suite-on-debian-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.raddemo.host #dkim #spf #dmarc #django #selfhosting #selfhosted #opendkim #opensource #reverseproxy
How to Deploy #Mailman Suite on #Debian #VPS for Automated Mailing List Management This article provides a detailed step-by-step guide demonstrating how to deploy Mailman Suite on Debian VPS for automated mailing list management. Mailman Suite includes Mailman Core, #Postorius (web UI), #HyperKitty (archiver), and the Mailman Web UI integration.
What is Mailman Suite? ...
Continued 👉 https://blog.radwebhosting.com/deploy-mailman-suite-on-debian-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.social #opendkim #selfhosting #dkim #django #selfhosted #opensource #dmarc #reverseproxy #spf
SPF is unnecessarily complex: it's a DNS txt record which more than often is on the zone apex and so cannot be CNAMEd. Their solution: a special policy called redirect (example from RFC 7280:
sf.example.com. TXT "v=spf1 redirect=_spf.example.com"
_spf.example.com. TXT "v=spf1 mx:example.com -all"
guess what? You could've designated a dedicate namespace similar to DMARC (e.g., _dmarc.example.com) and CNAME that to wherever you want.
#qotd on mailop@mailop.org
> SPF is now basically useless because many SPF records include multi-tenant mail
farms where one tenant can fake make from another.
https://list.mailop.org/private/mailop/2026-January/032134.html
#mail #spf #postmaster
諸々鑑みて Gmail へは転送しない（させない）のが正解なんじゃないの？
＞Gmail転送の落とし穴：2026年のPOP廃止で何が起きるか(管理者へDMARCでp=reject は 指定してはいけない! gmailに転送できなくなる。) #spf - Qiita qiita.com/asakawaya/items/5...
Gmail転送の落とし穴：2026年のPOP廃止で何が起きる...
諸々鑑みて Gmail へは転送しない（させない）のが正解なんじゃないの？
＞Gmail転送の落とし穴：2026年のPOP廃止で何が起きるか(管理者へDMARCでp=reject は 指定してはいけない! gmailに転送できなくなる。) #spf - Qiita https://qiita.com/asakawaya/items/5cfcf024cdd3919cc01f
How to Deploy #Mailman Suite on #Debian #VPS for Automated Mailing List Management This article provides a detailed step-by-step guide demonstrating how to deploy Mailman Suite on Debian VPS for automated mailing list management. Mailman Suite includes Mailman Core, #Postorius (web UI), #HyperKitty (archiver), and the Mailman Web UI integration.
What is Mailman Suite?
Mailman Suite ...
Continued 👉 https://blog.radwebhosting.com/deploy-mailman-suite-on-debian-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.social #selfhosted #opendkim #dmarc #reverseproxy #dkim #django #spf #selfhosting
Client Info
Server: https://mastodon.social
Version: 2025.07
Repository: https://github.com/cyevgeniy/lmst