Mar 12 2020
- last edited on
Apr 01 2022
I am having a big problem with office quarantining my user's emails before they are sent.
Here is some back story:
I run the IT for three businesses. two of them are on the same tenant in 365 but the other is on a separate tenant. The one that is on its own is the one having problems.
When an email on that tenant sends a message to a yahoo account there are no problems, but when it sends to another Microsoft based email account it is blocked by quarantine as a phishing email.
I understand that we can add a rule to allow emails from this tenant to come through but that is only a band-aid fix to the problem as if we need to send an email to someone who has these types of filters or another company using 365, we have no way to ask them to white list us or accept our emails.
I have tested this from multiple emails on this tenant and they all have the same result.
Mar 16 2020 01:38 AM
Have you run the message headers through a message header analyser? It may be that this tenant/sending domain has a misaligned SPF, DKIM or DMARC record
Microsoft Remote Connectivity Analyzer > Message Analyzer
Or MX toolbox