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Hello Jack,

Am 21.09.2022 um 15:26 schrieb Jack Woehr via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx>:

By default, SNDSMTPEMM sends your email From:
Subdomains in From: addresses is a no-no with modern SMTP servers.

This is *wrong*.

If you have set up your external DNS server properly with consistent A, AAAA, and PTR records, as well as an SPF TXT entry, you can send and receive mail from whatever FQDN you like.

If that FQDN is an internal server which needs to send out mail, that name might not be published in public DNS and is rightfully rejected. Then a MX entry is added for that name, to the internet facing gateway, being configured to deliver incoming mail properly, such as bounces for undeliverable mail.

Lately, it's "modern" to send mail with no-reply@ and throw away incoming mail to there, but with this, people throw away diagnostic messages also.

:wq! PoC

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