again: 450 is a tempfail and i do not know where you see a real problem, so was it a permanent problem or did you only get panic becuase one warning?
we can not debug your network nor check the clients ip since you hide it from one who would help you Am 28.04.2011 20:56, schrieb motty.cruz: > Problem was fixed; but I don't want to open my spam filter server to > spammers. Do you think that is a DNS configuration issue on our client's > DNS? When I issue the following command on the spam filter server > # nslookup client.ip.address > Server: my.dns.serverip > Address: my.dns.serverip#53 > > Non-authoritative answer: > Client.ip.address.in-addr.arpa name = mail.clientdomain.com. > > Thanks for your help. > > -----Original Message----- > From: owner-postfix-us...@postfix.org > [mailto:owner-postfix-us...@postfix.org] On Behalf Of Reindl Harald > Sent: Thursday, April 28, 2011 11:28 AM > To: postfix-users@postfix.org > Subject: Re: NOQUEUE: reject: RCPT from unknown[xxx.xxx.xxx]: 450 4.1.8 > > 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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