[Dovecot] Login issue

["M. Tolga Özses"]

Hi,

I have a login issue. I do everything I can think of, but can't login. 
My .conf file is at http://kabuto.kunduz.org/dovecot.conf and I make 
slight changes everytime I try a new thing. I last set 
disable_plaintext_auth to yes and when I try to login using Thunderbird, 
I get

*Code:*
Sending of username did not succeed. Mail server mail.somedomain.org 
responded: Plaintext authentication disabled.


, and dovecot.log reads

*Code:*
Info: pop3-login: Login failed: Plaintext authentication disabled: 
method=PLAIN, rip=212.98.201.1, lip=192.168.1.2.


When I set disable_plaintext_auth to no and try again, I get

*Code:*
Sending of password did not succeed. Mail server mail.somedomain.org 
responded: Authentication failed


and dovecot.log reads

*Code:*
dovecot: Jun 07 16:05:45 Info: auth(default): client in: AUTH   1      
 PLAIN   service=POP3    lip=192.168.1.2 rip=212.98.201.1      
resp=<hidden>
dovecot: Jun 07 16:05:45 Info: auth(default): client out: CONT  1
dovecot: Jun 07 16:05:45 Info: auth(default): client in: CONT<hidden>
dovecot: Jun 07 16:05:45 Info: auth(default): pam(kabuto,212.98.201.1): 
pam_authenticate() failed: Authentication failure
dovecot: Jun 07 16:05:46 Info: auth(default): client out: FAIL  1      
 user=kabuto
dovecot: Jun 07 16:05:47 Info: auth(default): client in: AUTH   2      
 PLAIN   service=POP3    lip=192.168.1.2 rip=212.98.201.1      
resp=<hidden>
dovecot: Jun 07 16:05:47 Info: auth(default): pam(kabuto,212.98.201.1): 
pam_authenticate() failed: Authentication failure
dovecot: Jun 07 16:05:48 Info: auth(default): client out: FAIL  2      
 user=kabuto
dovecot: Jun 07 16:05:51 Info: pop3-login: Disconnected: user=<kabuto>, 
method=PLAIN, rip=212.98.201.1, lip=192.168.1.2



Can you help me with this? Sorry that it is long, but it was the only 
way to describe completely.

Best regards,
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