Anyone here well verse in MS Exchange 5.5 server? I am having some problems with our mail server here at work. Lately, it seems that a few employees can't e-mail people at certain domains. This is a similar NDR that the sender gets.

Your message did not reach some or all of the intended recipients.

Subject: RE: United Way Agency Speakers Needed / Celebrity Event
Sent: 10/29/01 1:36:36 PM

The following recipient(s) could not be reached:

brian.wagner@allina.com on 11/3/01 9:42:18 AM
The recipient was unavailable to take delivery of the message
The MTS-ID of the original message is: c=US;a= ;p=United Way;l=UWEXCHANGE-011101153118Z-313
MSEXCH:IMS:United WayOMAIN:UWEXCHANGE 3499 (000B09AA) Host unreachable

Can anyone help me with this... I have searched TechNet and it doesn't say much on this error. Thanks in advance.

 

Hey there - I'm a net admin that runs Exchange 5.5 - something similiar has happened to my users in the past. I've found out that sometimes your ISP that's handling your e-mail is the problem. For instance, my ISP's e-mail server was on a list of e-mail servers that were being rejected for Spam reasons or something along those lines at one point. So basically, any email that my ISP's e-mail server was sending out to one paticular address was being rejected. In time, it corrected itself. Usually you have to contact your ISP and tell them of the problem so that they can get a jump start on the problem to fix it. And its not like I don't host my e-mail server, I do, but when it comes to problem like that, It's totally out of my hands.

 

GSX210HP: We host our my own mail...I use an ISP for relaying mail only. It's just recenlty that this started up. I have even contacted some of the recipient IS departments...they don't know what's causing it either. Hopefully, they will get back to me on what they figure out on their end.

 

It may be DNS resolution at your ISP. That's where your server resolves names. Give them a call. We just had a problem with that. Our ISP is UUNET.

 

Yea, seriously, 9 times out of 10 its the ISP's fault. Exchange might be a real security nightmare, but at least its reliable. For me anyway - just call the your ISP and bitch at them - it always works for me.

 

Just taking a swag, buy any chance your domain has been blackholed due to an open relay? Here's a couple of sites: http://www.orbz.org/ and http://www.mail-abuse.org/rbl/ to check.