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This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing

Posted on 2016-10-31
Medium Priority
Last Modified: 2016-11-08
After Migrating from a local exchange to office 365, only when I send an invite I get this message
This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing

I do have a spf record in place.
Question by:alonig1
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LVL 43

Expert Comment

by:Vasil Michev (MVP)
ID: 41867139
Which server is generating the NDR? Can you post it (the sanitized one) here?
LVL 16

Expert Comment

by:Jason Crawford
ID: 41867148
Did you update your SPF records after moving to Exchange Online?  Try using the Kitterman SPF tool to validate the syntax:


Author Comment

ID: 41867156
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LVL 16

Expert Comment

by:Jason Crawford
ID: 41867161
In that case we'll need to see the message to troubleshoot further.  One on one assistance is available if needed.

Accepted Solution

alonig1 earned 0 total points
ID: 41873277
It was the saving of the contact name. I needed to delete the names and re-enter them (local users)

Author Closing Comment

ID: 41878480

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