Is your feature request related to a problem?

Currently it is not possible to allow for auth_bind authentication for Dovecot by simple container configuration.

Describe the solution you'd like

For security reasons (https://wiki.dovecot.org/AuthDatabase/LDAP/AuthBinds) it is recommended to use BIND authentication against the LDAP server.

I think that configomat should allow for easy implementation of that feature.

Alternatives you've considered

Going with the password lookup. It works for most people (but then I think Active Directory does not allow password lookups).

Who will that feature be useful to?

All users looking into more secure setup and maybe AD users.

What have you done already?

I just started into implementing a container based mail setup and I'm in progress of evaluating the available options. So I did not yet implement this solution.

What are you going to contribute?

I'm neither an export on Dovecot nor LDAP. But of course I'll do the testing.

Additional context