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The mail system
<email@example.com>: host 127.0.0.1[127.0.0.1] said: 504 5.5.2 id=03268-01 -
Rejected by next-hop MTA on relaying, from MTA(smtp:[127.0.0.1]:10029): 504
5.5.2 <localhost>: Helo command rejected: need fully-qualified hostname (in
reply to end of DATA command)