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В очереди появляются такого рода письма:

q3H975d0012401   235569 Tue Apr 17 16:07 MAILER-DAEMON
      8BITMIME   (Deferred: Operation timed out with www.books.ru.)
                                         <hg@www.books.ru>
q3H7tqPl008796     8925 Tue Apr 17 14:55 MAILER-DAEMON
      8BITMIME   (Deferred: Name server: styx.sweb.ru.: host name lookup failu)
                                         <root@styx.sweb.ru>
q3GDsHko079409   220849 Mon Apr 16 20:54 MAILER-DAEMON
      8BITMIME   (Deferred: Operation timed out with www.books.ru.)
                                         <hg@www.books.ru>
q3G9OAGv072481   406676 Mon Apr 16 16:24 MAILER-DAEMON
      8BITMIME   (Deferred: Operation timed out with www.books.ru.)
                                         <hg@www.books.ru>
q3G7W9gt066555   228345 Mon Apr 16 14:32 MAILER-DAEMON
      8BITMIME   (Deferred: Operation timed out with www.books.ru.)
                                         <hg@www.books.ru>
                Total requests: 5

Смотрю в логах, только to=<>, from=<> вообще отсутствует. Что может быть и как бороться с таким спамом?

Apr 17 00:02:57 relay sm-mta[82992]: q3GDsHko079409: to=<hg@www.books.ru>, delay=03:08:40, xdelay=00:00:00, mailer=esmtp, pri=3670296, relay=www.books.ru., dsn=4.0.0, s
tat=Deferred: Operation timed out with www.books.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3GC38Um076974: to=<mailer@content.mail.ru>, delay=04:59:49, xdelay=00:00:00, mailer=esmtp, pri=5472758, relay=sender7.mail.ru., ds
n=4.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3GAW7rD074737: to=<mailer@content.mail.ru>, delay=06:30:50, xdelay=00:00:00, mailer=esmtp, pri=7228289, relay=sender7.mail.ru., ds
n=4.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3GA59HH073943: to=<mailer@content.mail.ru>, delay=06:57:48, xdelay=00:00:00, mailer=esmtp, pri=7627664, relay=sender7.mail.ru., ds
n=4.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3GA4ONk073909: to=<mailer@content.mail.ru>, delay=06:58:33, xdelay=00:00:00, mailer=esmtp, pri=7627679, relay=sender7.mail.ru., ds
n=4.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3GA3YRr073882: to=<mailer@news.mail.ru>, delay=06:59:23, xdelay=00:00:00, mailer=esmtp, pri=7834280, relay=sender7.mail.ru., dsn=4
.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3G9Figp072183: to=<mailer@content.mail.ru>, delay=07:47:13, xdelay=00:00:00, mailer=esmtp, pri=8539774, relay=sender7.mail.ru., ds
n=4.0.0, stat=Deferred: Operation timed out with sender7.mail.ru.
Apr 17 00:02:57 relay sm-mta[82992]: q3G9OAGv072481: to=<hg@www.books.ru>, delay=07:38:47, xdelay=00:00:00, mailer=esmtp, pri=8716135, relay=www.books.ru., dsn=4.0.0, s
tat=Deferred: Operation timed out with www.books.ru.