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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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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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NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 
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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Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

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