Dovecot Help (fixed from earlier)

[ubuntu-users-list at thomas.freit.ag]

Hi David,

On 13.07.21 02:42, david wrote:
> I recently switched from Centos/Sendmail to Ubuntu 20.04.2/Postfix/Dovecot.  Most of the functions I need are working except reading mail from an iPhone.  The mail server is on my own machine,
> and the mail client is on my iPhone.  I use Secure POP.
> The symptom I think I see on the server is an authentication failure, but I'm sure my passwords are correct (I do control both the iPhone and the server).  What information would help diagnose
> and hopefully fix the problem?
> Thanks for your assistance.

You can increase log details (in /etc/dovecot/conf.d/10-logging.conf), to check what dovecot is actually doing/seeing from the client (even with logging passwords, be careful). I would suggest:

auth_verbose=yes
verbose_ssl=yes
login_log_format_elements = "user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k" # see https://doc.dovecot.org/settings/core/#login-log-format-elements

In addition possibly:
auth_verbose_passwords = sha1:8 # this logs first 8 chars of sha1 password hash

You can post the output of "doveconf -n" (which lists your config, without keys or passwords, however you might want to strip other possible sensitive data, as IPs, hostnames, ...).

My first guess would be TLS error or auth method problem (plain vs. cram-md5 or something like this)...

hth,
Thomas