Even so, our reverse-dns record is setup properly. I've triple checked that today.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Hlabse Sent: Monday, April 05, 2004 7:43 PM To: Exchange Discussions Subject: RE: Problem sending to one domain Some email servers require a reverse lookup record. Not sure From: "Phillip Stafford" <[EMAIL PROTECTED]> Reply-To: "Exchange Discussions" <[EMAIL PROTECTED]> To: "Exchange Discussions" <[EMAIL PROTECTED]> Subject: Problem sending to one domain Date: Mon, 5 Apr 2004 19:44:25 -0400 One of our clients running Exchange 2003 on a Win 2003 SBS is having issues in sending to one domain. The Outlook error message is: Your message did not reach some or all of the intended recipients. Subject: Sent: 4/5/2004 7:18 PM The following recipient(s) could not be reached: [EMAIL PROTECTED] on 4/5/2004 7:25 PM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mail.sendingdomain.com #5.5.0 smtp;500 Non RFC-compliant response received> I enabled maximum logging on several of the subcategories on the MSExchange Transport in System Manager. In the App Event Log, the following error is logged: Event Type: Warning Event Source: MSExchangeTransport Event Category: Connection Manager Event ID: 4006 Date: 4/5/2004 Time: 1:48:21 PM User: N/A Computer: Server Description: Message delivery to the host 'xxx.x.xxx.xx' failed while delivering to the remote domain 'receivingdomain.com' for the following reason: The connection was dropped by the remote host. To further assist, I went and started logging SMTP connections through a 3rd party app (MailMonitor) and listed below is the log for the connection: 220 **************************************************************0*2******* ******************200******2**0 *0*00 EHLO mail.domainname.com 500 Syntax error, command "XXXX mail.sendingdomain.com" unrecognized QUIT Since it appeared the recipient's server was having trouble with the EHLO command and no HELO command was ever issued as a result, I created an SMTP connector for their domain, using their IP address as the smarthost and giving their domain name of type SMTP in address space a cost of 1. When trying afterwards, the email again fails. In MailMonitor, the log is below: 220 **************************************************************0*2******* ******************200*****02**0 *0*00 HELO mail.sendingdomain.com QUIT So, it looks like the problem is something more than just the EHLO/HELO specification. I don't understand WHY, when sending HELO it then quits. I even tried sending emails from my own server (running Exchange 2003 Standard) and my email goes through fine. I have emailed their IT support on this issue and they claim that the problem is at our end. According to them, they are not performing any reverse-DNS lookups (our reverse-DNS has already been configured properly, by the way) and they are not blocking emails from our domain. This problem has been happening sporadically over the past few weeks (ever since we moved our mail in-house). Any help is greatly appreciated. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ Tax headache? MSN Money provides relief with tax tips, tools, IRS forms and more! http://moneycentral.msn.com/tax/workshop/welcome.asp _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with.
