> 
> can you try to send only using IPv4? I once had a problem with a friend's 
> server - same error message, but even if it said domain reputation, IPv4 
> worked, whereas IPv6 did not.
This.  This is a known issue.  A lot of senders who send through Microsoft have 
this issue; are you sending through Microsoft?  If so we have instructions for 
how to fix that by forcing sending through IPv4 when you send to Google.

Anne

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