Am 28.04.2011 20:20, schrieb motty.cruz: > Hello, > > Looks like one of our clients are trying to email us but their emails are > getting rejected. I’m sorry I will not > display customers ip > > Apr 28 11:11:12 host postfix/smtpd[48962]: warning: hostname mail.tld.com > does not resolve to address xxx.xxx.xxx > Apr 28 11:11:12 host postfix/smtpd[48962]: connect from unknown[xxx.xxx.xxx] > Apr 28 11:11:12 host postfix/smtpd[48962]: NOQUEUE: reject: RCPT from > unknown[xxx.xxx.xxx]: 450 4.1.8 > <cli...@tld.com>: Sender address rejected: Domain not found; > from=<client.tld.com> to=<u...@mydomain.com> > proto=ESMTP helo=<mail.tld.com>
450 is a temporary error and the client will combe back or is not standard-conform > Sender address rejected: Domain not found your dns can not solve the sender-domain maybe a temporary dns-problem > reject_unknown_sender_domain says you want this behavior
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