Am 02.05.24 um 04:38 schrieb Thomas Krichel via Exim-users:
Jeremy Harris via Exim-users writesYou mailed person A. A has their mails configured, at the MX for A, to be forwarded to B. You don't have control over that configuration; it is entirely A's choice. He wanted it to be done. But you have configured your system, probably in "SPF" terms, you say "any messages claiming to be from me *must* be be sent by *my* system. Any messages being sent by any other system are invalid, and should be rejected." The message is being sent onwards by A's MX to B's MX. it is being sent by A's MX, as far as B's MX is concerned. B's MX implements SPF, and does what you claim you wanted. It rejects the message, since the message did not arrive at that host directly from your MX. And thus, a traditional and useful feature of email handling has been broken.You are touching on something I always wanted to know about but was to shy to ask. I run the mailboxre...@repec.org on my server. This is an email address that has been around for donkey's years and thus gets a lot of spam. I don't have an imap server for the readers of this email so I forward it to their external addresses. I understand that this breaks the SPF from the sending domain, and puts my server at the risk of being noted as an SPF breaker.
That is, what SRS is for. While forwarding, you rewrite the sender of the original mail to form, that it's from the forwarding server domainwaise and contains the original mail address for replies.
best regards, Cyborg
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