>From experience: the RFC and real life are a bit off. with out an MX record exchange will look at the root of your FQDN, so it will look at durr-usa.com and see that IP. It will not go any deeper to a machine name. Just add an MX record and solve the problem.
--Kevinm M, WLKMMAS, UCC+WCA, And Beyond Did I just say that out loud? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Joe Pochedley Sent: Wednesday, March 13, 2002 10:16 AM To: Exchange Discussions Cc: '[EMAIL PROTECTED]' Subject: RE: Network Error During Host Resolution They shouldn't need an actual MX record if they have an A record..... (I know it's proper to have an MX record, but it's not absolutely necessary.....) Since de.durr-usa.com DOES have an A record, Exchange SMTP SHOULD be able to locate it.... >From RFC 2821 Section 3.6 3.6 Domains Only resolvable, fully-qualified, domain names (FQDNs) are permitted when domain names are used in SMTP. In other words, names that can be resolved to MX RRs or A RRs (as discussed in section 5) are permitted, as are CNAME RRs whose targets can be resolved, in turn, to MX or A RRs. Local nicknames or unqualified names MUST NOT be used. There are two exceptions to the rule requiring FQDNs: - The domain name given in the EHLO command MUST BE either a primary host name (a domain name that resolves to an A RR) or, if the host has no name, an address literal as described in section 4.1.1.1. - The reserved mailbox name "postmaster" may be used in a RCPT command without domain qualification (see section 4.1.1.3) and MUST be accepted if so used. >From Section 5 Once an SMTP client lexically identifies a domain to which mail will be delivered for processing (as described in sections 3.6 and 3.7), a DNS lookup MUST be performed to resolve the domain name [22]. The names are expected to be fully-qualified domain names (FQDNs): mechanisms for inferring FQDNs from partial names or local aliases are outside of this specification and, due to a history of problems, are generally discouraged. 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. If one or more MX RRs are found for a given name, SMTP systems MUST NOT utilize any A RRs associated with that name unless they are located using the MX RRs; the "implicit MX" rule above applies only if there are no MX records present. If MX records are present, but none of them are usable, this situation MUST be reported as an error. Still Looking........ Joe Pochedley "I like deadlines," cartoonist Scott Adams once said. "I especially like the whooshing sound they make as they fly by." -----Original Message----- From: Roger Seielstad [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 13, 2002 12:56 PM To: Exchange Discussions Subject: RE: Network Error During Host Resolution They don't have an MX record, so you can't find a server to which you can deliver mail: bash-2.04$ dig de.durr-usa.com mx ; <<>> DiG 9.1.2 <<>> de.durr-usa.com mx ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37004 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;de.durr-usa.com. IN MX ;; AUTHORITY SECTION: durr-usa.com. 7200 IN SOA ns1.ameritech.net. postmaster.ameritech.net. 200111271 3600 900 604800 7200 ;; Query time: 361 msec ;; SERVER: 66.92.212.61#53(66.92.212.61) ;; WHEN: Wed Mar 13 12:52:37 2002 ;; MSG SIZE rcvd: 97 ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Peregrine Systems Atlanta, GA > -----Original Message----- > From: Joe Pochedley [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, March 13, 2002 11:40 AM > To: Exchange Discussions > Subject: Network Error During Host Resolution > > > Kind ladies and gentlemen of the list. I am sending this message > again in hopes that someone will be able to help me. > I'm not intending to spam the list, just looking for some > assistance. I've heard from a few people off list that > they've also experienced similar problems, but none of them > have / had a solution and were hoping that I had found > something with yesterday's inquiry....... > > If anyone out there can help, or at least give me another direction to > explore I would greatly appreciate it. (I know about MS PSS and it is > my final option, but I'd rather not go there). > > My Exchange Server is v5.5 SP4 > > Problem is as follows: > > -Begin Quoted Error Message- > > Your message did not reach some or all of the intended recipients. > > Subject: RE: Durr Industries > Sent: 3/10/02 1:11 PM > > The following recipient(s) could not be reached: > > '[EMAIL PROTECTED]' on 3/12/02 1:01 PM > The recipient name is not recognized > The MTS-ID of the original message is: c=US;a= > ;p=namfg;l=SEQUOYAH-020310181103Z-71 > MSEXCH:IMS:namfg:cleveland:SEQUOYAH 3499 > (000B09AA) network error during host resolution > > [EMAIL PROTECTED] on 3/12/02 1:01 PM > The recipient name is not recognized > The MTS-ID of the original message is: c=US;a= > ;p=namfg;l=SEQUOYAH-020310181103Z-71 > MSEXCH:IMS:namfg:cleveland:SEQUOYAH 3499 > (000B09AA) network error during host resolution > > -End Quoted Error Message- > > I'm getting this error when trying to send to de.durr-usa.com, and > have in the past had this error on a few other addresses, but the > message has always eventually gone through in the past. This time > though, I can't get anything to go through to de.durr-usa.com. > Supposedly, we have been able to send to these recipients in the past, > but it's only been in the past two months that there have been any > problems that the end user has complained about... No changes have > been made to our Exchange Server or DNS servers for at least > the past 4-6 months. > > I am able to look up de.durr-usa.com using the same DNS server that > the exchange server is using, so it's not that the DNS server can't > resolve the host name... I looked up durr-usa.com's DNS records and > there is no MX record for the sub domain 'de' but there is an A > record, so theoretically the Exchange SMTP service should use the A > record in place of the MX record, correct? > > I am at a loss. > > Thanks in advance. > > Joe Pochedley > > > _________________________________________________________________ > 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] > _________________________________________________________________ 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] _________________________________________________________________ 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] _________________________________________________________ Do You Yahoo!? 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