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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
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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.
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Question by:alonig1
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LVL 39

Expert Comment

by:Vasil Michev (MVP)
ID: 41867139
Which server is generating the NDR? Can you post it (the sanitized one) here?
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LVL 14

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:

http://www.kitterman.com/spf/validate.html
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Author Comment

by:alonig1
ID: 41867156
Yes.
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LVL 14

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.
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Accepted Solution

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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)
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Author Closing Comment

by:alonig1
ID: 41878480
solved.
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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