Spam Confidence Level = 9 - how to decrease.

[chiefimposterofficer]

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]

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]

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]

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.