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On Sat, 2 Dec 2017, Mark Foley wrote:

I have a Samba4 Active Directory server. Dovecot authenticates AD Users with 
domain credentials
using GSSAPI (Thunderbird client). I believe I have Dovecot set to attempt 
authentication via
                                     ^^^^^^^^^^ ????
shadow first and. failing that, it does authenticate via GSSAPI.

Smartphones connect to Dovecot via port 143 and SSL.  They are not domain 
members so if the
shadow authentication fails, no other methods are tried and no connection is 
made.

What can I do with my dovecot config to fix this?

If you are asking about how to auth against AD with plain credentials, see https://wiki2.dovecot.org/AuthDatabase/LDAP

You can add another passdb {} . However, this enables any client to use plain credentials, incl. Thunderbird.

- -- Steffen Kaiser
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