It's not just that the site is missing an Mx record, they also lack a valid PTR for their A record. The number of domains which so poorly manage their DNS is thankfully small, relatively speaking.
> -----Original Message----- > From: RBHATIA [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, August 28, 2002 3:56 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. 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