Как отключить hostname lookup в postfix?

2 фрагмента из лога postfix:

Mar 14 22:05:59 server postfix/smtpd[7391]: 361B819CD37: client=community8.interfree.it[213.158.72.61]
Mar 14 22:06:00 server postfix/smtpd[7391]: reject: RCPT from community8.interfree.it[213.158.72.61]: 450 <kelly@atlitics.org>: Sender address rejected: Domain not found; from=<kelly@atlitics.org> to=<marketing@SERVER.RU>
Mar 14 22:06:06 server postfix/smtpd[7391]: disconnect from community8.interfree.it[213.158.72.61]

ar 14 22:23:18 server postfix/smtpd[7407]: connect from unknown[193.125.214.4]
Mar 14 22:23:21 server postfix/smtpd[7407]: 17A7E19CD37: client=unknown[193.125.214.4]
Mar 14 22:23:21 server postfix/smtpd[7407]: reject: RCPT from unknown[193.125.214.4]: 450 Client host rejected: cannot find your hostname, [193.125.214.4]; from=<saler-bounce@media2000.ru> to=<lex@server.ru>

Какая опция в конфиге отвечает за lookup имен?