Ah, it would appear that you need to provide the envelope sender explicitly ( MailFrom => $From ); otherwise it falls back to some expensive guesswork (mailaddress/maildomain in Mail::Util), and that seems to be failing...

In reply to Re: e-mail fails with address that is not a fully qualified domain by Anonymous Monk
in thread e-mail fails with address that is not a fully qualified domain by merrymonk

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