On 09/11/2018 08:20 PM, Kai Schaetzl wrote:
I have to disable mail acceptance for example1.com. If not, mail sent *from* that server (e.g. from a web form) to that domain will not leave the server. However, if I disable example1.com for mail dovecot lmtp will not deliver mail to this mail box anymore, although the mailbox still exists.
First and foremost, you are describing a major routing problem *for the MTA*. You want it to do local delivery (via LMTP) for user1@example1.com, but forward mail addressed to foobar@example1.com to that domain's current MX. Since MTAs usually(!) decide that based on the *domain*, you have a need for some off-the-textbook tweaking right there. And the config to make *dovecot* work as needed would need to pick up from there.
If we're talking postfix, my first idea would be to make example1.com a virtual alias domain and set up a transport table with entries user1@example1.com local: # ... etc. etc. ... example1.com smtp:$HOW_TO_REACH_THE_MX (with $HOW_TO_REACH_THE_MX being anything from "use the official MX from DNS" to "contact this internal IP on this port, *without* DNS lookups", whichever your (internal?) networking necessitates).
http://www.postfix.org/transport.5.html
With a bit of luck, that might already "contain" the weirdness to the point that neither the MX nor dovecot need config hacks.
Regards,
Jochen Bern Systemingenieur
www.binect.de www.facebook.de/binect