hello,

i have a mail server installed in my machine ubunut 9.04(postfix,pop3 and imap).
i want to have in what log file I can find information about how many messages are sent and how many messages are not sent using command lines?

thanks

/var/log/mail.log

I have seen him but, it contains:

Jun 27 12:27:52 lamia-laptop postfix/pickup[23419]: 5F6DF1516F6: uid=0 from=<root>
Jun 27 12:27:52 lamia-laptop postfix/cleanup[6026]: 5F6DF1516F6: message-id=<20100627112752.5F6DF1516F6@mail.example.com>
Jun 27 12:27:52 lamia-laptop postfix/qmgr[11532]: 5F6DF1516F6: from=<root@mail.lamia.com>, size=767, nrcpt=1 (queue active)
Jun 27 12:27:52 lamia-laptop postfix/local[14787]: 5F6DF1516F6: to=<root@mail.lamia.com>, orig_to=<root>, relay=local, delay=0.17, delays=0.12/0/0/0.05, dsn=2.0.0, status=sent (delivered to maildir)
Jun 27 12:27:52 lamia-laptop postfix/qmgr[11532]: 5F6DF1516F6: removed
Jun 27 12:28:03 lamia-laptop postfix/pickup[23419]: 02E33151706: uid=1000 from=<lamia>
Jun 27 12:28:03 lamia-laptop postfix/cleanup[6026]: 02E33151706: message-id=<20100627112803.02E33151706@mail.example.com>
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 02E33151706: from=<lamia@mail.lamia.com>, size=793, nrcpt=1 (queue active)
Jun 27 12:28:03 lamia-laptop postfix/local[14787]: 02E33151706: to=<lamia@mail.lamia.com>, orig_to=<lamia>, relay=local, delay=0.13, delays=0.11/0/0/0.02, dsn=2.0.0, status=sent (delivered to maildir)
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 02E33151706: removed
Jun 27 12:28:03 lamia-laptop postfix/pickup[23419]: 3033E15170A: uid=1000 from=<lamia>
Jun 27 12:28:03 lamia-laptop postfix/cleanup[6026]: 3033E15170A: message-id=<20100627112803.3033E15170A@mail.example.com>
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 3033E15170A: from=<lamia@mail.lamia.com>, size=558, nrcpt=1 (queue active)
Jun 27 12:28:03 lamia-laptop postfix/local[14787]: 3033E15170A: to=<lamia@mail.lamia.com>, orig_to=<lamia>, relay=local, delay=0.43, delays=0.41/0/0/0.01, dsn=2.0.0, status=sent (delivered to maildir)
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 3033E15170A: removed
Jun 27 12:28:03 lamia-laptop postfix/pickup[23419]: 366EB1516FE: uid=1000 from=<lamia>
Jun 27 12:28:03 lamia-laptop postfix/cleanup[6026]: 366EB1516FE: message-id=<20100627112803.366EB1516FE@mail.example.com>
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 366EB1516FE: from=<lamia@mail.lamia.com>, size=681, nrcpt=1 (queue active)
Jun 27 12:28:03 lamia-laptop postfix/local[14787]: 366EB1516FE: to=<lamia@mail.lamia.com>, orig_to=<lamia>, relay=local, delay=0.24, delays=0.19/0/0/0.05, dsn=2.0.0, status=sent (delivered to maildir)
Jun 27 12:28:03 lamia-laptop postfix/qmgr[11532]: 366EB1516FE: removed

........................

it contains at all time this lines above.

how can have information about sent messages?

To find the number of mails sent:
However, if your logfile is rotated, it will not be correct.

Since you use postfix, take a look at the plugins
http://www.postfix.com/addon.html

how can i know if my log file isn't rotated?

Look in your
directory for compressed files