Thanks Thomas. Seems like that might be the cause of the problem. I am running a Win2K DNS server. I'm going to update the SP to fix this problem and check if that resolves the issue. Will report back on the results.
-----Original Message----- From: Thomas Di Nardo [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 5:39 PM To: Exchange Discussions Subject: RE: No MX Record ? What DNS are you using? If you're using Win2K or NT4.0 DNS take a look at Q295933. This would cause the behavior you are seeing. Tom. -----Original Message----- From: RBHATIA [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 4:56 PM To: Exchange Discussions Subject: RE: No MX Record ? I had to relay to work around this issue. Has anyone else had similar issues with Exchange 5.5 not being able to send email to domains with a missing MX record ? -----Original Message----- From: Blunt, James H (Jim) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 3:11 PM To: Exchange Discussions Subject: RE: No MX Record ? Our incoming mail comes through a Linux-based mail relayer, while our outgoing goes from the IMS through our proxy server, which also doubles as our DNS lookup server. And no...the proxy doesn't have 5.5 installed on it. -----Original Message----- From: Baker, Jennifer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 11:54 AM To: Exchange Discussions Subject: RE: No MX Record ? After looking at his dns, I'm amazed his mail works at all. Is your relay server a 5.5 server? It doesn't act like one, which is probably why it does work. -----Original Message----- From: Blunt, James H (Jim) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 10:52 AM To: Exchange Discussions Subject: RE: No MX Record ? Jennifer, I hate to argue, but that statement is incorrect. Exchange 5.5 SP4 does in fact send e-mail to a domain, if no mx record exists. I know this because one of our admins sends e-mail to his personal mail server from work all the time. His domain name is hopeless.nu and his mail is located at mail.hopeless.nu. Doing an NSLOOKUP on this domain shows no mx record for hopeless.nu and only a cname record for mail.hopeless.nu. Jim -----Original Message----- From: Baker, Jennifer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 9:35 AM To: Exchange Discussions Subject: RE: No MX Record ? 5.5 requires an mx record to send mail. This is not RFC behavior IMO. E2k does not require it and uses the "a" record if an "mx" record is not present. -----Original Message----- From: RBHATIA [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 9:24 AM To: Exchange Discussions Subject: RE: No MX Record ? I did look up the RFC...and am soliciting a response from this list since it wasn't much help in resolving my problem. Here is an excerpt from the RFC that doesn't apply to my Exchange server : The lookup first attempts to locate an MX record associated with the name. If a CNAME record is found instead, the resulting name is processed as if it were the initial name. If no MX records are found, but an A RR is found, the A RR is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host. In this case there is an A record associated with HOUSTONFEARLESS.COM - 65.204.137.153 So why do the emails still sit in the queue ? -----Original Message----- From: Andy David [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 12:19 PM To: Exchange Discussions Subject: RE: No MX Record ? RFC2821 -----Original Message----- From: RBHATIA [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 12:09 PM To: Exchange Discussions Subject: RE: No MX Record ? How does Exchange 5.5 handle mail in the absence of an MX record ? -----Original Message----- From: Andy David [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 12:13 PM To: Exchange Discussions Subject: RE: No MX Record ? One does not absolutely need a MX record to receive mail. -----Original Message----- From: RBHATIA [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 12:03 PM To: Exchange Discussions Subject: No MX Record ? Hi, I've been having problems sending email to users in a domain called houstonfearless.com The IMC queue states "Network error during host resolution". I did some troubleshooting and it seems like the domain does not have an MX record. I'm running Exchange 5.5. SP4 that is using DNS to send email externally. What's wierd though is that they are receiving email from other people. I even sent them a test message from my YAHOO account and they received it. Any ideas ?? _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] ------------------------------------------------------------------------ ---- -- The information contained in this email message is privileged and confidential information intended only for the use of the individual or entity to whom it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copy of this message is strictly prohibited. If you have received this email in error, please immediately notify Veronis Suhler Stevenson by telephone (212)935-4990, fax (212)381-8168, or email ([EMAIL PROTECTED]) and delete the message. 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