Web and DNS at hosting company and mail at LAN -> some rejected mails guybrushtw[ at ]hotmail.com 4/27/2007 11:14:06 AM Hi all: I have searched the forums, but can't seem to find a suitable answer. This is mi case: Our domain lives in a dedicated server at a hosting company, with IP 62.xx.xx.87. We have the DNS tables and our website there. Recently we changed the MX record to point to our Exchange server, in our company. We have an external fixed IP given by an ISP: 213.xx.xx. 117. Everything is fine, except for some domains, which reject our mail: 2007-04-26 06:57:33 194.x.x.80 OutboundConnectionCommand SMTPSVC1 - MAIL FROM:<someone[ at ]domain.com> 0 2007-04-26 06:57:33 194.x.x.80 OutboundConnectionResponse SMTPSVC1 - - 550+5.7.1+Access+denied 0 However, if I try to send that same mail from the hosting company IP via telnet to port 25 of 194.x.x.80, it works perfectly. So, it compares the domain name given at HELO with the IP from which the message is being sent. I've been reading about it, and I guess we should have a PTR record for the Exchange server. Is that right? How can I set it? Should it be written in the DNS zone in our dedicated server, pointing to the IP given by our ISP? This is my current DNS table: $TTL 86400 [ at ] IN SOA ns.domain.com. a.a.a. ( 1164006442 ; Serial 10800 ; Refresh 3600 ; Retry 604800 ; Expire 3600) ; Minimum domain.com. IN NS ns.domain.com. domain.com. IN NS dns1.domain.com. domain.com. IN NS dns2.domain.com. ns.domain.com. IN A 62.xx.xx.87 domain.com. IN A 62.xx.xx.87 webmail.domain.com. IN A 62.xx.xx.87 mssql.domain.com. IN A 62.xx.xx.87 sitebuilder.domain.com. IN A 62.xx.xx.87 mail.domain.com. IN A 213.xx.xx.117 dns1.domain.com. IN A 62.xx.xx.88 dns2.domain.com. IN A 62.xx.xx.89 exchange.domain.com. IN A 213.xx.xx.117 ftp.domain.com. IN CNAME domain.com. www.domain.com. IN CNAME domain.com. lists.domain.com. IN CNAME domain.com. domain.com. IN MX 10 mail.domain.com. TIA and best regards, Javi.

Re: Web and DNS at hosting company and mail at LAN -> some rejected mails "Kevin D. Goodknecht Sr. [MVP]" <admin[ at ]nospam.WFTX.US> 4/27/2007 11:36:22 AM Read inline please. In news:1177672446.170792.267300[ at ]n35g2000prd.googlegroups.com, guybrushtw[ at ]hotmail.com <guybrushtw[ at ]hotmail.com> typed: [Quoted Text] > Hi all: > > I have searched the forums, but can't seem to find a suitable answer. > This is mi case: > > Our domain lives in a dedicated server at a hosting company, with IP > 62.xx.xx.87. We have the DNS tables and our website there. > > Recently we changed the MX record to point to our Exchange server, in > our company. We have an external fixed IP given by an ISP: 213.xx.xx. > 117. > > Everything is fine, except for some domains, which reject our mail: > > 2007-04-26 06:57:33 194.x.x.80 OutboundConnectionCommand SMTPSVC1 - > MAIL FROM:<someone[ at ]domain.com> 0 > 2007-04-26 06:57:33 194.x.x.80 OutboundConnectionResponse SMTPSVC1 - - > 550+5.7.1+Access+denied 0 > > However, if I try to send that same mail from the hosting company IP > via telnet to port 25 of 194.x.x.80, it works perfectly. So, it > compares the domain name given at HELO with the IP from which the > message is being sent. > > I've been reading about it, and I guess we should have a PTR record > for the Exchange server. Is that right? How can I set it? Should it be > written in the DNS zone in our dedicated server, pointing to the IP > given by our ISP? You need to contact your ISP for the PTR, reverse lookups are usually maintained by the ISP that owns the IP address. -- Best regards, Kevin D. Goodknecht Sr. [MVP] Hope This Helps Send IM: http://www.icq.com/people/webmsg.php?to=296095728 =================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from your issue, to respond directly to me remove the nospam. from my email address. =================================== http://www.lonestaramerica.com/ http://support.wftx.us/ http://message.wftx.us/ =================================== Use Outlook Express?... Get OE_Quotefix: It will strip signature out and more http://home.in.tum.de/~jain/software/oe-quotefix/ =================================== Keep a back up of your OE settings and folders with OEBackup: http://www.oehelp.com/OEBackup/Default.aspx ===================================