...

doveadm user mailtest field value uid 1002 gid 8 home /home/mailtest mail mbox:~/mail:INBOX=/var/mail/mailtest system_groups_user mailtest

Looks fine.

[log files] I'll try to locate them.

Your best hope. Maybe this helps

doveconf -n | grep log_

Or just force it somewhere by settings the *log_path configuration values. Also your mail server's log when trying to deliver.

Joseph Tam <jtam.home@gmail.com>