First guess, Ben, is that they are set to deny relaying, but I would guess incorrrectly.
IIRC, that's RFC compliant behavior for denying relaying - as long as it tanks before giving a valid response to the 354 section. Roger ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Peregrine Systems Atlanta, GA > -----Original Message----- > From: Ben Schorr [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, March 19, 2002 6:00 PM > To: Exchange Discussions > Subject: Some "Hosts Unreachable" > > > This is a new one on me; maybe some of you have seen it > before. Exchange 5.5 on NT4SP6a using the IMS to connect > through an ISA server. On a handful of hosts the message > queues up with a "Host Unreachable" error. On most hosts > (including old favorites like aol.com, hotmail.com, etc.) > mail comes and goes just fine and we don't seem to be having > any problems RECEIVING mail. > > But to this small band of hosts (including hawaii.edu and > hawaii.rr.com) the mail just queues up. Here's a snippet > from an SMTP log that may shed some > light: > > 3/19/02 12:15:06 PM : >>> MAIL > FROM:<[EMAIL PROTECTED]> SIZE=1977 RET=FULL > 3/19/02 12:15:06 PM : <<< IO: |250 2.1.0 > [EMAIL PROTECTED] OK > | > 3/19/02 12:15:06 PM : <<< 250 2.1.0 > [EMAIL PROTECTED] OK > 3/19/02 12:15:06 PM : >>> RCPT TO:<[EMAIL PROTECTED]> > NOTIFY=FAILURE,DELAY > > 3/19/02 12:15:06 PM : <<< IO: |250 2.1.5 [EMAIL PROTECTED] > | > 3/19/02 12:15:06 PM : <<< 250 2.1.5 [EMAIL PROTECTED] > 3/19/02 12:15:06 PM : >>> DATA > > 3/19/02 12:15:06 PM : <<< IO: |354 Start mail input; > end with <CRLF>.<CRLF> > | > 3/19/02 12:15:06 PM : <<< 354 Start mail input; end > with <CRLF>.<CRLF> > 3/19/02 12:16:22 PM : 499 Host unreachable: cta.net. Message > subject: ""Plain Text Test"". Rescheduling delivery for later. > > Notice that it seems to be going fine until it gets the 354 > message, then it sits for a little over a minute and seems to > time out. This particular test message was just a couple of > lines of plain text; so it shouldn't be a size issue. > > We've already restarted the IMS several times and the entire > Exchange server once. Judging by the oldest message in the > queue this problem seems to have started this weekend and no > unusual system maintenance or changes occurred over the > weekend. As far as I know we were able to send mail to/from > those domains just fine on Friday. > > Baffling. Any thoughts on what might be causing this and how > we can resolve it? > > -Ben- > Ben M. Schorr, MVP-Outlook, CNA, MCPx3 > Director of Information Services > Damon Key Leong Kupchak Hastert > http://www.hawaiilawyer.com <http://www.hawaiilawyer.com> > > > _________________________________________________________________ > 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]
