lmtp and virtual users

[Aki Tuomi]

On 27.9.2019 23.21, David Wells - Alfavinil S.A. via dovecot wrote:
> Good afternoon.
>
> I have dovecot setup to authenticate virtual users using either gssapi
> or doind a bind to an ldap server to achieve a single sign on capable
> imap server connected to a samba active directory DC. What I am also
> trying to achieve is to have dovecot's lmtp daemon handle the mails
> passed from postfix. However, the only way I've gotten this to work is
> setting allow_all_users = yes in the userdb but this causes lmtp to
> deliver mails to non existant accounts without rejection. I've been
> searching but haven't found a way to set this same thing up but having
> dovecots lmtp check the validity of the mails recipient against the same
> samba AD DC through ldap before delivering it and rejecting unknown
> email addresses. Could someone please provide some insight into how to
> achieve this?
>
> Thank you very much in advance.
> Best regards,
> David Wells.
>
>
You could setup LDAP userdb without bind authentication, and use a
service account instead.

Aki