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Mail from one user to my domain not being delivered by Google

This is the message I am receiving from our user who is remote.  

The sender indicates that he can reach no one in my domain - but it seems to be him.  Any suggestions?


Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain outbounds9.obsmtp.com by outbounds9.obsmtp.com.

The error that the other server returned was:
550 permanent failure for one or more recipients (jegnatinsky@aaahc.org:quarantined)
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jplack07
Asked:
jplack07
1 Solution
 
Md. MojahidCommented:
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Vijaya Babu SekarAssociate Ops ManagerCommented:
Could you please check the domain has been listed in the block list? You may check it through below link. If listed your domain. You would need to remove the IP address of your MX record from the blocked list. Thanks.

mxtoolbox.com -> blocklist
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