How to send mail to mailbox with disabled domain?

[Gerald Galster]

Is this a dovecot problem on your side? dovecot usually accepts mail
from MTA like postfix, so it would be better to remove example1.com from
postfix relaydomains (mailbox domains, alias domains, ...). Then there
is no delivery to dovecot. Most MTAs ignore MX records - if a domain is
configured locally, it gets delivered.

Best regards
Gerald

> Am 11.09.2018 um 20:20 schrieb Kai Schaetzl <maillists at conactive.com>:
> 
> Given the following:
> 
> mailboxes:
> user1 at example1.com
> user2 at example1.com
> user3 at example1.com
> etc.
> 
> aliases:
> whatever at example1.com -> user1 at example1.com
> whatever at example2.com -> user1 at example1.com
> whatever at example3.com -> user1 at example1.com
> 
> Now the problem:
> example1.com MX goes elsewhere (doesn't point to this server anymore).
> Domains example2.com and example3.com still point to that server and 
> should be able to accept mail.
> 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.
> 
> How can I solve this? Is there a way of solving this, but keeping the 
> domain example1.com in the name for these mailboxes?
> Or is there a way to tell dovecot to ignore domains for mailbox names? 
> e.g. deliver to "user1"? (All user localparts are unique.)
> 
> Thanks for any hints.
> 
> Kai
> 
>