[Dovecot] dovecot: imap-login: Aborted login

[Adnane]

Hello every one

first I'am new to mail servers,

I have followed this tutorial --> 
https://library.linode.com/email/postfix/postfix2.9.6-dovecot2.0.19-mysql?format=print 
to set up
an Ubuntu 12.04 Dovecot postfix mail box for a subdomain 
mailer.adnane.me,  I think I followed every thing right but I get
disconnected when I try to access adnane at mailer.adnane.me with thunderbird

dig mx mailer.adnane.me +short
1 mailer.adnane.me.


root at mailer:~# postmap -q mailer.adnane.me 
mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
1
root at mailer:~# postmap -q adnane at mailer.adnane.me 
mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
1

I think the issue is with authentication


root at mailer:~# tail -f /var/log/syslogJul
Jul 22 03:34:41 mailer dovecot:imap-login: Disconnected (no auth 
attempts): rip=41.251.155.145, lip=5.135.151.43, TLS
Jul 22 03:35:02 mailer dovecot: imap-login: Disconnected (no auth 
attempts): rip=41.251.155.145, lip=5.135.151.43, TLS handshaking: 
Disconnected
Jul 22 03:35:02 mailer dovecot: imap-login: Disconnected (no auth 
attempts): rip=41.251.155.145, lip=5.135.151.43, TLS handshaking: 
Disconnected
Jul 22 03:35:03 mailer dovecot: imap-login: Disconnected (no auth 
attempts): rip=41.251.155.145, lip=5.135.151.43, TLS: Disconnected


plz let me know which conf files I need to post here, tnx.