I would say that you need a reverse DNS record for your machine.
> [rdp@nobleman updates]$ nslookup Default Server: ns1.mv.net Address: 199.125.85.1 > mail.diffloth.com Server: ns1.mv.net Address: 199.125.85.1 Non-authoritative answer: Name: mail.diffloth.com Address: 199.232.38.4 > 199.232.38.4 Server: ns1.mv.net Address: 199.125.85.1 *** ns1.mv.net can't find 199.232.38.4: Non-existent host/domain so host->ip works, but ip->host doesn't. My guess is that att's mail server is doing a reverse lookup on the IP to check it matches the name it's being passed. Ask whomever does DNS for you to add a reverse record for that machine. --rdp On Fri, 8 Feb 2002, Joshua S. Freeman wrote: > I host a domain for a friend of mine.. the domain name is diffloth.com. I > also host mail services for her. Basically, any mail that comes in for > her at my machine is forwarded to her attbroadband.com account. This has > worked perfectly for months. > > Starting this morning we're seeing stuff like what's below. it seems that > attbroadband isn't willing to take mail from my host? > > Any idea how to troubleshoot/fix this kind of problem? > > TIA, > > J. > > > > ----- The following addresses had permanent fatal errors ----- > [EMAIL PROTECTED] > (expanded from: <[EMAIL PROTECTED]>) > > ----- Transcript of session follows ----- > ... while talking to chmls10.cp.ipsvc.net.: > >>> MAIL From:<[EMAIL PROTECTED]> SIZE=108 > <<< 451 4.1.8 unresolvable relay host name[199.232.38.4] > ... while talking to ndmls01.cp.ipsvc.net.: > >>> MAIL From:<[EMAIL PROTECTED]> SIZE=108 > <<< 451 4.1.8 unresolvable relay host name[199.232.38.4] > ... while talking to chmls17.cp.ipsvc.net.: > >>> MAIL From:<[EMAIL PROTECTED]> SIZE=108 > <<< 553 5.1.2 <[EMAIL PROTECTED]>... unresolvable relay host > name[199.232.38.4] > 501 [EMAIL PROTECTED] Data format error > > > -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- > Joshua S. Freeman | preferred email: [EMAIL PROTECTED] > pgp public key: finger [EMAIL PROTECTED] > http://www.threeofus.com > -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- > > > ***************************************************************** > To unsubscribe from this list, send mail to [EMAIL PROTECTED] > with the text 'unsubscribe gnhlug' in the message body. > ***************************************************************** > -- Rich Payne http://talisman.mv.com ***************************************************************** To unsubscribe from this list, send mail to [EMAIL PROTECTED] with the text 'unsubscribe gnhlug' in the message body. *****************************************************************
