Marc Lucke via Postfix-users:
> re:
> https://techcommunity.microsoft.com/t5/exchange-team-blog/updated-requirements-for-smtp-relay-through-exchange-online/ba-p/3851357
>
That text is about relaying email: you originate a message, and use
Postfix to ask a Microsoft email service to deliver that message
to some recipient on the Internet.
As documented at the link that you cite, Microsoft requires that
the SMTP client is authorized to use the MAIL FROM domain.
> Let's say I send an email. I use:
>
> > mail from: <annoy...@spammer.com>
>
> and in the data (body)
>
> > From: Professional Legit Person
> <igotalovelybunchofcoconuts@innocent.pizza>
That appears to be a different use case: you are not originating a
message for some recipient on the Internet, instead you appear to
be using Postfix to forward a message from the Internet to a Microsoft
email service.
For this, your best bet is to forward the message as an attachment,
instead of inline. That is, create a new email message, from your
email address, and attach the forwarded message as message/rfc822.
I do this sporadically, using the 'forward' feature of a mail reader
program. If you want to do this in some automated manner, perhaps
Bill Cole has some tooling suggestions.
Wietse
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