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TimSANConcepts's avatar
TimSANConcepts
Copper Contributor
Dec 22, 2021

Our 365 Emails to other 365 tenants going to junk

Team,

 

We are currently a month into diagnosing an issue with other 365 tenants marking our email as spam, we've reviewed headers, DKIM, DMARC, MX SPF, every little thing we can think of and still getting marked as spam.

 

Adding more to this, it's consistently inconsistent, even the engineers at Microsoft are puzzled, we spent about $2000 on an exchange engineer, everything is perfect, his testing was flawless, BUT still face these issues with many companies.

 

What's next? I am at a loss.

365 Exchange
Excchange
filter
Junk
Spam
  • JonasBack's avatar
    JonasBack
    Steel Contributor
    Dec 23, 2021

    I feel you. Had the same issue with one customer. Headers showed no problems. Implemented SPF -all and DMARC p=reject but still, emails went was marked as spam at recipient.

    In this case it turns out that the sending domain website (in this case it was WordPress but it can happen to any website) was infected with malware which probably caused their domain to be marked as suspicious. However, it was very hard to find this was the cause. On reason could also be that everyone linked to the website in their signatures.

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