Quote:
Originally Posted by SideshowBob
It's convenient that FM allows people to send email from third-party domains, but it shouldn't allow anyone to send using someone else's address that hosted at FM. If they do it makes a mockery of SPF and DMARC. .
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I believe there can be legitimate reasons why one might want to send using a FastMail email address other than your own in the From field. However, the owner of the address ought to first authorise doing so.