Dear Markus Falb
Thanks for your response,
i know these commands but if you will carefully look into logs, you will notice that my server is sending mail not receiving. therefor it has nothing to do with their PTR weather it is correct or in correct. that is according to the logic. anyways
Thanks / Regards
On 12.4.2012 13:29, Prabhpal S. Mavi wrote:
Dear All Greetings,
i am admin for ISP two years now, relay emails for more than 300 companies (CentOS/Postfix). Relaying more than 10,000 messages every hours successfully. no one has ever compliant for non delivery. but i cannot relay to this domain. The servers responsible for accepting messages are rejecting. i have given the whole log for experts to monitor.
it is something out of control, because it is not my problem. Our server has all record created (A,MX,PTR,SPF etc). i have three relay hosts fully functional. destination server is not accepting from any relay host.
can anyone try from his server and see if it is deliverable to ray@tata-nigeria.com
Thanks / Regards Prabhpal S. Mavi
Apr 12 11:06:00 titan postfix/qmgr[11860]: C3C142E4012: from=****@digital-infotech.net, size=1391, nrcpt=1 (queue active) Apr 12 11:06:02 titan postfix/smtp[12039]: C3C142E4012: host mx2.servershost.net[205.234.223.160] said: 450 4.1.7 ****@digital-infotech.net: Sender address rejected: unverified address: host mail.digital-infotech.net[41.211.25.193] said: 450 4.7.1 Client host rejected: cannot find your hostname, [205.234.223.198] (in reply to RCPT TO command) (in reply to RCPT TO command) Apr 12 11:06:03 titan postfix/smtp[12039]: C3C142E4012: to=ray@tata-nigeria.com, relay=mx3.servershost.net[66.225.214.101]:25, delay=1381, delays=1377/0.03/3.4/0.31, dsn=4.1.7, status=deferred (host mx3.servershost.net[66.225.214.101] said: 450 4.1.7 ****@digital-infotech.net: Sender address rejected: unverified address: host mail.digital-infotech.net[41.211.25.193] said: 450 4.7.1 Client host rejected: cannot find your hostname, [205.234.223.198] (in reply to RCPT TO command) (in reply to RCPT TO command))
Thanks / Regards Prabhpal S. Mavi
I think the destination server is trying a callback verification http://en.wikipedia.org/wiki/Callback_verification but that fails because your server is doing checks as described in http://en.wikipedia.org/wiki/FCrDNS
$ host 205.234.223.198 198.223.234.205.in-addr.arpa domain name pointer mx4.servershost.net. $ host mx4.servershost.net. mx4.servershost.net has address 66.225.237.241 -- Kind Regards, Markus Falb
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Thanks / Regards Prabhpal S. Mavi