I had a similar problem a couple of months ago, seemed that no one else had an issue sending to a friend of mine, except me. His ISP had some DNS issues as it turned out. Improperly enter MX records to be specific. For some reason it only seemed to affect my Exchange Server (I am sure there were others, but he was getting mail from other people). Marty Richards, one of the list regulars got me going with the following: On your mail server:
Start -> run -> nslookup >set query=mx >his.domain.com Does it return MX records at all? If so, do they match what you were expecting? If not, can you telnet from your Exchange box to the MX record with lowest priority on port 25? The MX query above should return names, such as mail.his.domain.com, not IPs. You might want to check the names resolve to the IPs you expect. The far end isn't having any other troubles that they know of? I worked with the admin at his ISP to get their MX records cleaned up and all has been fine since then. HTH Jay Personette [EMAIL PROTECTED] http://www.mavtech.com/ (281) 455-3993 -----Original Message----- From: Bao, Gang [mailto:[EMAIL PROTECTED]] Sent: Friday, July 26, 2002 11:31 AM To: MS-Exchange Admin Issues Subject: RE: Problem in sending mail to specific host We use Exchange 5.5 SP4. The returned message says "...network error during host resolution. Bob -----Original Message----- From: Bao, Gang [mailto:[EMAIL PROTECTED]] Sent: Friday, July 26, 2002 12:16 PM To: MS-Exchange Admin Issues Subject: Problem in sending mail to specific host Hello Everyone, Our Exchange server can not send mail to a specific host (listserv). We can ping both host name and IP of their listserv, we can also telnet the port 25 of the host. I spoke to the listserv admin. They did not block us on their FireWall and no any restrictions to us; they can receive mails from other places. Our server can send/receive mail from any places. Any idea what's wrong? Thanksssss. Bob List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
