Catchall with UserDB?

[Ferenc]

>> On 15/03/2020 02:32 Ferenc < dovecot at bezemkast.nl> wrote:
>> 
>> Hi!
>> 
>> I've set up Postfix with virtual users. I wanted to get Dovecot and LMTP up and running with
>> Passwd-file UserDB, which they do, but I can't figure out how to make use of a catch-all.

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> 
> You do it in postfix using virtual alias, just like before.
> ---
> Aki Tuomi

Could you tell me where to find how I do this? I've looked at https://doc.dovecot.org/configuration_manual/protocols/lmtp_server/.

With Dovecot-LDA I got virtual aliases working by using the -d ${user} flag in Postfix' master.cf. So /usr/lib/dovecot/dovecot-lda gets called with what Postfix thinks is the user in the -d flag. This worked. But I don't know how to pass ${user} to the lmtp -d flag?

I'm on Debian in a virtualbox vm. 

Thanks & cheers,
Ferenc