Am 02.05.24 um 04:38 schrieb Thomas Krichel via Exim-users:
> Jeremy Harris via Exim-users writes
>
>> You 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 mailboxrepec@??? 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
--
## subscription configuration (requires account):
##
https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/
## unsubscribe (doesn't require an account):
## exim-users-unsubscribe@???
## Exim details at
http://www.exim.org/
## Please use the Wiki with this list -
http://wiki.exim.org/
