> - посмотреть в логи, заняться их анализом и размышлениями о смысле жизни. cat /var/log/maillog
Dec 3 13:45:59 ast-real sendmail[17202]: qATC4lAb003474: to=<adress@localmail.ru>, ctladdr=<root@ast-real.localdomain> (0/0), delay=3+21:41:12, xdelay=00:00:00, mailer=esmtp, pri=8581343, relay=mx.localmail.ru., dsn=4.0.0, stat=Deferred: Connection timed out with mx.localmail.ru.
Dec 3 13:45:59 ast-real sendmail[17202]: qATC44mb003408: to=<adress@localmail.ru>, ctladdr=<root@ast-real.localdomain> (0/0), delay=3+21:41:45, xdelay=00:00:00, mailer=esmtp, pri=8581343, relay=mx.localmail.ru., dsn=4.0.0, stat=Deferred: Connection timed out with mx.localmail.ru.
Dec 3 13:45:59 ast-real sendmail[17202]: qATC3rqs003371: to=<adress@localmail.ru>, ctladdr=<root@ast-real.localdomain> (0/0), delay=3+21:42:06, xdelay=00:00:00, mailer=esmtp, pri=8581343, relay=mx.localmail.ru., dsn=4.0.0, stat=Deferred: Connection timed out with mx.localmail.ru.
Dec 3 14:05:12 ast-real sendmail[17278]: qB3A5CkP017278: from=root, size=1155, class=0, nrcpts=1, msgid=<201212031005.qB3A5CkP017278@ast-real.localdomain>, relay=root@localhost
Dec 3 14:05:12 ast-real sendmail[17279]: qB3A5Cg5017279: from=<root@ast-real.localdomain>, size=1455, class=0, nrcpts=1, msgid=<201212031005.qB3A5CkP017278@ast-real.localdomain>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 3 14:05:12 ast-real sendmail[17278]: qB3A5CkP017278: to=adress@localmail.ru, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=31155, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (qB3A5Cg5017279 Message accepted for delivery)
[root@]# telnet mx.localmail.ru 25
Trying zz.zzz.zz.zzz...
telnet: connect to address zz.zzz.zz.zzz: Connection timed out
telnet: Unable to connect to remote host: Connection timed out
[root@ ~]# ping mx.localmail.ru
PING mx.localmail.ru (zz.zzz.zz.zzz) 56(84) bytes of data.
64 bytes from mail.localmail.ru (zz.zzz.zz.zzz): icmp_seq=1 ttl=255 time=0.276 ms
64 bytes from mail.localmail.ru (zz.zzz.zz.zzz): icmp_seq=2 ttl=255 time=0.215 ms
64 bytes from mail.localmail.ru (zz.zzz.zz.zzz): icmp_seq=3 ttl=255 time=0.222 ms
64 bytes from mail.localmail.ru (zz.zzz.zz.zzz): icmp_seq=4 ttl=255 time=0.420 ms
Похоже это маршрутизатор: zz.zzz.zz.zzz виновен?