Проблема с Sendmail

При отправки писем о регистрации с сайта пишет в maillog

Dec 14 14:04:32 SERV sendmail[4188]: My unqualified host name (SERV) unknown; sleeping for retry
Dec 14 14:05:35 SERV sendmail[4188]: unable to qualify my own domain name (SERV) -- using short name
Dec 14 14:05:35 SERV sendmail[4188]: nBE85Zid004188: from=www, size=4110, class=0, nrcpts=1, msgid=<200912140805.nBE85Zid004188@SERV>, relay=www@localhost
Dec 14 14:05:35 SERV sm-mta[4192]: nBE85ZgZ004192: from=<www@SERV>, size=4345, class=0, nrcpts=1, msgid=<200912140805.nBE85Zid004188@SERV>, proto=ESMTP, daemon=IPv4, relay=localhost [127.0.0.1]
Dec 14 14:05:35 SERV sendmail[4188]: nBE85Zid004188: to=mymail@bk.ru, ctladdr=www (80/80), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=34110, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (nBE85ZgZ004192 Message accepted for delivery)
Dec 14 14:05:35 SERV sm-mta[4194]: nBE85ZgZ004192: to=<mymail@bk.ru>, ctladdr=<www@SERV> (80/80), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=34345, relay=mxs.mail.ru. [94.100.176.20], dsn=5.0.0, stat=Service unavailable
Dec 14 14:05:35 SERV sm-mta[4194]: nBE85ZgZ004192: nBE85ZgZ004194: DSN: Service unavailable
Dec 14 14:05:35 SERV sm-mta[4194]: nBE85ZgZ004194: to=<www@SERV>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=35369, relay=local, dsn=2.0.0, stat=Sent

в php.ini прописаны строки

php_value sendmail_from mail@mysite.ru
php_admin_value sendmail_path /usr/sbin/sendmail

Письма в ящик на mail.ru не приходят, на gmail.com попадают в сомнительные. Понимаю что на майле я в спаме из-за