Hi,

Yes this is possible with the passdb_username_filter (https://doc.dovecot.org/2.4.2/core/config/auth/passdb.html#passdb_username_f...)

So if you've got one passdb for example.com and another one for every other domain you would do something like:

passdb {
   driver = ...
   args = ...
   ...
   username_filter = *@example.com # to skip this passdb for other domains
   result_succes=|return-ok # to skip later passdbs result_fail=return-fail # again to 
not ask later passdbs if auth failed } passdb { # passdb for other 
domains .... } ``` |

|(this configuration example is for 2.3 and needs to be adapted for 2.4)|

||||
Kind regards,
Markus


On 11/11/25 18:14, lejeczek via dovecot wrote:
>     Hi guys.
>
>     Is it possible to tell dovecot to authenticate with a specific back-end
>     for a given domain?
>     If it would not the only back-end a given account of a specific domain
>     would try, then it would be the first back-end such account would try to
>     auth against - possible?
>
>     many thanks, L.
>
> _______________________________________________
> dovecot mailing list --dovecot@dovecot.org
> To unsubscribe send an email todovecot-leave@dovecot.org

   Hi,

   Yes this is possible with the passdb_username_filter
   ([1]https://doc.dovecot.org/2.4.2/core/config/auth/passdb.html#passdb_username_filter)

   So if you've got one passdb for example.com and another one for every
   other domain you would do something like:

passdb { driver = ... args = ... ... username_filter = *@example.com # to skip this passdb for other domains result_succes=return-ok # to skip later passdbs result_fail=return-fail # again to not ask later passdbs if auth failed } passdb {

passdb for other domains

.... }

  (this configuration example is for 2.3 and needs to be adapted for 2.4)

  Kind regards,
  Markus

  On 11/11/25 18:14, lejeczek via dovecot wrote:

   Hi guys.

   Is it possible to tell dovecot to authenticate with a specific back-end
   for a given domain?
   If it would not the only back-end a given account of a specific domain
   would try, then it would be the first back-end such account would try to
   auth against - possible?

   many thanks, L.

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References

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  1. https://doc.dovecot.org/2.4.2/core/config/auth/passdb.html#passdb_username_filter
  2. mailto:dovecot@dovecot.org
  3. mailto:dovecot-leave@dovecot.org