>> 2015-03-14 19:53:50 Send_09   - 450 Return
>> Path not v
>> erifiable.
>> 2015-03-14 19:53:50 Send_09  450 Return Path not verifiable.

> If I had to guess, I would suspect the reject is based an SPF validation
> failure.

I put SPF records in the DNS records for the affected domains and things seem
like they are working now.

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