squirell login output:
ERROR: Connection dropped by IMAP server.
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manual: http://www.howtoforge.com/virtual-users-and-domains-with-postfix-courier-mysql-and-squirrelmail-ubuntu-12.04-lts

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mail.log
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Oct  1 19:10:04 (none) pop3d: Connection, ip=[::ffff:127.0.0.1]
Oct  1 19:10:04 (none) imapd: Connection, ip=[::ffff:127.0.0.1]
Oct  1 19:10:04 (none) pop3d: Disconnected, ip=[::ffff:127.0.0.1]
Oct  1 19:10:04 (none) imapd: Disconnected, ip=[::ffff:127.0.0.1], time=0
Oct  1 19:10:05 (none) postfix/smtpd[8822]: connect from localhost[127.0.0.1]
Oct  1 19:10:05 (none) postfix/smtpd[8822]: lost connection after CONNECT from localhost[127.0.0.1]
Oct  1 19:10:05 (none) postfix/smtpd[8822]: disconnect from localhost[127.0.0.1]

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mail.err
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Oct  1 19:04:45 (none) imapd: testik@aboutbob.eu: No such file or directory