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

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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alonig1Asked:
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alonig1Author Commented:
It was the saving of the contact name. I needed to delete the names and re-enter them (local users)
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Vasil Michev (MVP)Commented:
Which server is generating the NDR? Can you post it (the sanitized one) here?
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Jason CrawfordTransport NinjaCommented:
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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alonig1Author Commented:
Yes.
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Jason CrawfordTransport NinjaCommented:
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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alonig1Author Commented:
solved.
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