This is output of log when i try to send mail to a alias account info@example.com from a@example.com.
i made alias in /etc/postfix/aliases like this
info: x@example.com, y@example.com
Log Output from tail -f /var/log/mail.log
May 22 23:05:02 mail roundcube: [22-May-2010 23:05:02 +0600]: Successful login for a@example.com (id 2) from 112.137.4.3
May 22 23:05:29 mail postfix/smtpd[4082]: connect from localhost[127.0.0.1]
May 22 23:05:29 mail postfix/smtpd[4082]: A2E404D8062: client=localhost[127.0.0.1], sasl_method=LOGIN, sasl_username=a@example.com
May 22 23:05:29 mail postfix/cleanup[4085]: A2E404D8062: message-id=<76c26fffb9ab7e0608e8ca31fae8b4c0@127.0.0.1>
May 22 23:05:29 mail postfix/qmgr[24356]: A2E404D8062: from=<a@example.com>, size=695, nrcpt=1 (queue active)
May 22 23:05:29 mail roundcube: [22-May-2010 23:05:29 +0600]: User a@example.com [112.137.4.3]; Message for <info@example.com>; 250: 2.0.0 Ok: queued as A2E404D8062
May 22 23:05:29 mail postfix/smtpd[4082]: disconnect from localhost[127.0.0.1]
May 22 23:05:29 mail postfix/smtpd[4096]: connect from localhost[127.0.0.1]
May 22 23:05:29 mail postfix/smtpd[4096]: DEE9A4D8063: client=localhost[127.0.0.1]
May 22 23:05:29 mail postfix/cleanup[4085]: DEE9A4D8063: message-id=<76c26fffb9ab7e0608e8ca31fae8b4c0@127.0.0.1>
May 22 23:05:29 mail postfix/qmgr[24356]: DEE9A4D8063: from=<a@example.com>, size=1645, nrcpt=1 (queue active)
May 22 23:05:29 mail postfix/smtpd[4096]: disconnect from localhost[127.0.0.1]
May 22 23:05:29 mail amavis[22053]: (22053-04) Passed CLEAN, MYNETS LOCAL [127.0.0.1] [127.0.0.1] <a@example.com> -> <a@example.com>, Message-ID: <76c26fffb9ab7e0608e8ca31fae8b4c0@127.0.0.1>, mail_id: qRNZksRPaBUH, Hits: -7.093, size: 695, queued_as: DEE9A4D8063, 244 ms
May 22 23:05:29 mail postfix/smtp[4091]: A2E404D8062: to=<info@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.28, delays=0.03/0/0/0.25, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=22053-04, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as DEE9A4D8063)
May 22 23:05:29 mail postfix/qmgr[24356]: A2E404D8062: removed
May 22 23:05:29 mail postfix/pipe[4097]: DEE9A4D8063: to=<info@example.com>, relay=dovecot, delay=0.07, delays=0.02/0.01/0/0.04, dsn=2.0.0, status=sent (delivered via dovecot service)
May 22 23:05:29 mail postfix/qmgr[24356]: DEE9A4D8063: removed