Вот последние строки файла /var/log/mail.log
Jun 9 10:03:57 Debian-60-squeeze-64-LAMP sendmail[14517]: r5983vlQ014517: to=sem3en1 <sem3en@bk.ru>, ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=35185, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (r5983v1U014519 Message accepted for delivery)
Jun 9 10:03:57 Debian-60-squeeze-64-LAMP sm-mta[14521]: r5983v1U014519: to=<sem3en@bk.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=125352, relay=mxs.mail.ru. [94.100.176.20], dsn=5.0.0, stat=Service unavailable
Jun 9 10:03:57 Debian-60-squeeze-64-LAMP sm-mta[14521]: r5983v1U014519: r5983v1U014521: DSN: Service unavailable
Jun 9 10:03:57 Debian-60-squeeze-64-LAMP sm-mta[14521]: r5983v1U014521: to=<www-data@localhost.localdomain>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30000, dsn=2.0.0, stat=Sent
Jun 9 10:05:19 Debian-60-squeeze-64-LAMP sm-mta[14542]: r56AcEpk001146: to=<ruslan2287228@yandexs.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=2+21:27:05, xdelay=00:00:42, mailer=esmtp, pri=37745393, relay=148.240.4.32. [148.240.4.32], dsn=4.0.0, stat=Deferred: Connection timed out with 148.240.4.32.
Jun 9 10:07:02 Debian-60-squeeze-64-LAMP sm-mta[14542]: r55AduWD004607: to=<marat@mail.net>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=3+21:27:06, xdelay=00:01:43, mailer=esmtp, pri=50435342, relay=mx.messaging.ca.mci.com., dsn=4.0.0, stat=Deferred: Connection timed out with mx.messaging.ca.mci.com.
Jun 9 10:15:19 Debian-60-squeeze-64-LAMP sm-mta[15255]: r56AcEpk001146: to=<ruslan2287228@yandexs.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=2+21:37:05, xdelay=00:00:42, mailer=esmtp, pri=37835393, relay=148.240.4.32. [148.240.4.32], dsn=4.0.0, stat=Deferred: Connection timed out with 148.240.4.32.
Jun 9 10:20:28 Debian-60-squeeze-64-LAMP sm-mta[15255]: r55AduWD004607: to=<marat@mail.net>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=3+21:40:32, xdelay=00:05:09, mailer=esmtp, pri=50525342, relay=mx.messaging.ca.mci.com., dsn=4.0.0, stat=Deferred: Connection timed out with mx.messaging.ca.mci.com.
Jun 9 10:25:19 Debian-60-squeeze-64-LAMP sm-mta[16363]: r56AcEpk001146: to=<ruslan2287228@yandexs.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=2+21:47:05, xdelay=00:00:42, mailer=esmtp, pri=37925393, relay=148.240.4.32. [148.240.4.32], dsn=4.0.0, stat=Deferred: Connection timed out with 148.240.4.32.
Jun 9 10:31:03 Debian-60-squeeze-64-LAMP sm-mta[16363]: r55AduWD004607: to=<marat@mail.net>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=3+21:51:07, xdelay=00:05:44, mailer=esmtp, pri=50615342, relay=mx.messaging.ca.mci.com., dsn=4.0.0, stat=Deferred: Connection timed out with mx.messaging.ca.mci.com.
Jun 9 10:31:09 Debian-60-squeeze-64-LAMP sendmail[17085]: r598V9vL017085: from=www-data, size=5182, class=0, nrcpts=1, msgid=<201306090831.r598V9vL017085@localhost.localdomain>, relay=www-data@localhost
Jun 9 10:31:09 Debian-60-squeeze-64-LAMP sm-mta[17086]: r598V99r017086: from=<www-data@localhost.localdomain>, size=5349, class=0, nrcpts=1, msgid=<201306090831.r598V9vL017085@localhost.localdomain>, proto=ESMTP, daemon=MTA-v4, relay=Debian-60-squeeze-64-LAMP [127.0.0.1]
Jun 9 10:31:09 Debian-60-squeeze-64-LAMP sendmail[17085]: r598V9vL017085: to=BORG <frendf64@gmail.com>, ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=35182, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (r598V99r017086 Message accepted for delivery)
Jun 9 10:31:09 Debian-60-squeeze-64-LAMP sm-mta[17088]: STARTTLS=client, relay=gmail-smtp-in.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=RC4-SHA, bits=128/128
Jun 9 10:31:11 Debian-60-squeeze-64-LAMP sm-mta[17088]: r598V99r017086: to=<frendf64@gmail.com>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=00:00:02, xdelay=00:00:02, mailer=esmtp, pri=125349, relay=gmail-smtp-in.l.google.com. [74.125.143.26], dsn=2.0.0, stat=Sent (OK 1370766671 8si4455841lbp.136 - gsmtp)
Jun 9 10:33:43 Debian-60-squeeze-64-LAMP sendmail[17351]: r598Xhm3017351: from=www-data, size=5192, class=0, nrcpts=1, msgid=<201306090833.r598Xhm3017351@localhost.localdomain>, relay=www-data@localhost
Jun 9 10:33:43 Debian-60-squeeze-64-LAMP sm-mta[17353]: r598XhjZ017353: from=<www-data@localhost.localdomain>, size=5359, class=0, nrcpts=1, msgid=<201306090833.r598Xhm3017351@localhost.localdomain>, proto=ESMTP, daemon=MTA-v4, relay=Debian-60-squeeze-64-LAMP [127.0.0.1]
Jun 9 10:33:44 Debian-60-squeeze-64-LAMP sendmail[17351]: r598Xhm3017351: to=xaker36 <superperd@yandex.ru>, ctladdr=www-data (33/33), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=35192, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (r598XhjZ017353 Message accepted for delivery)
Jun 9 10:33:45 Debian-60-squeeze-64-LAMP sm-mta[17355]: r598XhjZ017353: to=<superperd@yandex.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=00:00:02, xdelay=00:00:01, mailer=esmtp, pri=125359, relay=mx.yandex.ru. [213.180.193.89], dsn=2.0.0, stat=Sent (Ok: queued on mxfront6h.mail.yandex.net as HdRnv0dM84-XiCunWph)
Jun 9 10:35:19 Debian-60-squeeze-64-LAMP sm-mta[17437]: r56AcEpk001146: to=<ruslan2287228@yandexs.ru>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=2+21:57:05, xdelay=00:00:42, mailer=esmtp, pri=38015393, relay=148.240.4.32. [148.240.4.32], dsn=4.0.0, stat=Deferred: Connection timed out with 148.240.4.32.
Jun 9 10:40:31 Debian-60-squeeze-64-LAMP sm-mta[17437]: r55AduWD004607: to=<marat@mail.net>, ctladdr=<www-data@localhost.localdomain> (33/33), delay=3+22:00:35, xdelay=00:05:12, mailer=esmtp, pri=50705342, relay=mx.messaging.ca.mci.com., dsn=4.0.0, stat=Deferred: Connection timed out with mx.messaging.ca.mci.com.
Есть еще в /var/mail три файла: mail, root, www-data. Какие нужны?
А где конфиги лежат? х)