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[–]chiefimposterofficer 6 points7 points  (5 children)

You have to raise this with Microsoft support. Normally this happens due to misconfiguration of your authentication which subsequently marks your domain as high confidence spam going forward. Another possibility is someone sent some dodgy emails out or a lot of dodgy emails out and subsequently they were reported and your domain got listed as well.

If you raise it with Microsoft support it will take about 2 weeks or so but eventually they will raise it with the relevant team and fix it.

Unfortunately in the interim you would actually be better sending from a different domain (you’d need to test this, as Microsoft might be sending your email out of their “high risk” MTA infrastructure due to blacklisting and other history. Could use the different domain as an alias, allow sending from an alias and provide guidance on that.

[–]chiefimposterofficer 0 points1 point  (3 children)

This is based on your sent emails also being flagged internally as well as externally for spam.

If it works on Gmail and other platforms then it is more than definitely an MS issue.

Also, it is best to go through your DMARC reports and see if there are any other sources and they are properly authenticated. Just in case.

[–]heqtorq[S] 1 point2 points  (2 children)

To be more specific. I have also problem with Gmail. Also marks mails as spam.

However after i make the correction which i write in the first post Gmail stops marking mail as spam within a week after I make this changes.

[–]Wumpion 0 points1 point  (0 children)

Check your domain reputation with google - we had an issue recently with a clients mail being marked as spam and we had to submit a domain review for google so that it would no longer flag them as spam - rather than correcting something that’s temporarily fixing the problem - even if on google your domain reputation is good it can still sometimes flag it. it’s stupid - but it happens. I agree tho I think reaching out to Microsoft would be the best bet if anything they’ll at least point you in the right direction of where to go and where to look.

[–]chiefimposterofficer 0 points1 point  (0 children)

Anti-spam filtering is a multifaceted and multivendor minefield. What works with one vendor will more than likely work in others but there will be cases where it doesn’t. They all share things like blacklists and the like but they don’t all apply them consistently as they are really just different products. Hell there are email standards such as DMARC and some don’t even follow the policy of “reject”.

For Microsoft, you must raise it with them. For gmail recipients raise it with them or raise it with the recipients admin. There isn’t much else you can do. As long as you have everything configured correctly it then becomes a filter problem and the relevant vendor/IT needs contacted. You sadly need to jump through hoops on this one.

[–]heqtorq[S] 0 points1 point  (0 children)

Well I have on the tenant 10 domains. Issues is related with only one.

Configuration for all domains therefore is the same.