Praktisch alle mail vanaf deze tenant komt in de spambox

[Briefcase]

Hallo,

We hebben problemen met mail richting 365 tenants en Hotmail. Google en overige mail providers gaan prima, maar bij Microsoft diensten belanden ze steevast in de spam box.

Een message header van een mail dat de mist in gaat, staat hieronder.

- ik heb blacklist checks gedaan
- dkim toegevoegd
- spf gecheckt.
- Mailgenius score van 96, alleen een opmerking over DMARC


bedankt alvast!

code:

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From: Manon | somecompany <[e-mail]>
To: Bart Aaldering | someitcompany ICT Specialisten <[e-mail]>
Subject: RE: test
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[fastedje]

Briefcase schreef op zaterdag 1 april 2023 @ 11:24:
Hallo,

We hebben problemen met mail richting 365 tenants en Hotmail. Google en overige mail providers gaan prima, maar bij Microsoft diensten belanden ze steevast in de spam box.

Een message header van een mail dat de mist in gaat, staat hieronder.

Ik vind de volgende header wel verdacht:

code:

Authentication-Results-Original: dkim=none (message not signed)
 header.d=none;dmarc=none action=none header.from=somecompany.nl;

Over het algemeen vind ik office365 erg veel nietszeggende headers toevoegen wat het troubleshooting erg lastig maakt.
Verder maakt office365 de DKIM signatures na ontvangst altijd stuk waardoor je deze in een mailclient als Thunderbird niet meer kan controleren achteraf.

Wat ik uit de headers niet kon zien: heb je een reverse DNS record aangemaakt voor je uitgaande source IP? Zonder geldig reverse ip record.beland je mail bijna altijd in een spambox.

[olivercccp]

Hallo @Briefcase ,

Ik heb hetzelfde probleem ondervonden, volgens wat ik zie is er een IP adres van Microsoft dat niet in hun eigen SPF staat waardoor deze niet toegelaten wordt. Wij zijn al 2 IPv6 adressen tegengekomen op dit moment dat niet in hun SPF record staat.

Momenteel heb ik nog geen oplossing gevonden maar hier vind je een thread dat al een aantal jaar terug gaat met hetzelfde probleem: https://techcommunity.mic...on-spf-record/m-p/1358371


Moest je een oplossing gevonden hebben, tag me gerust


Grts

[akimosan]

Oh ja, die ben ik ook al tegengekomen. Doet MS helemaal niets aan en de antwoorden die je krijgt van MS zijn ruk. Dat gezegd hebbende, is het eigenlijk wel een probleem aan de andere kant wanneer zij de berichten in de SPAM box laten komen.

Eh, dat is dus ook MS. Wij hadden het probleem bij een partij die zelf de mailhosting nog deed.
Hoewel er een SPF fail is, zouden berichten met een geldige DKIM signature ook geaccepteerd moeten worden, zelfs in geval van een SPF fail

Maar eigenlijk moet je DMARC wel implementeren zodat je een policy kunt instellen hoe strict een andere partij met je domein en email moet omgaan.
Het gebruik van Valimail kan helpen om snel DMARC in te richten en te kijken waar nog berichten allemaal vandaan komen:

https://www.valimail.com/...65-free-dmarc-monitoring/
Pas op met strict alignment nadat je DMARC hebt geïmplementeerd.
Gedurende testen kan het praktisch zijn om SPF en DKIM op strict te zetten zodat je zicht hebt op berichten die falen.

https://support.valimail....rict-vs-relaxed-alignment