General discussion

Locked

Exchange 5.0

By jhicks ·
Have a customer running Exchange 5.0 on an NT 4.0 (SP 6) box. Clients are running outlook 2000. They cannot send emails to a couple of domains. For example they can send mail to most addresses but when they try to send mail to someone at verizon.net or stargate.net, the emails come back as undeliverable. It's only a handful of domains that they cxant send mail to. Can't find anything in the Exchange settings that would stop the mail from being sent to those domains. They are on a DSL connection and their (ISP's) DNS servers are resolving names as far as I can tell. Anyone have any idea of what could be going on? Any help would be appreciated. Thanks.

This conversation is currently closed to new comments.

3 total posts (Page 1 of 1)  
| Thread display: Collapse - | Expand +

All Comments

Collapse -

Exchange 5.0

by curlergirl In reply to Exchange 5.0

Have you checked the reverse lookup on the DNS servers? This could be the cause, if the recipient domain's email server is set to reject email if a reverse lookup fails - this is a security setting that many admins are putting into effect. Also, you might want to check to see if you have been put on someone's open relay s**t list - I ran across one case in which we couldn't email to one specific domain because they were using an ISP who in turn was using an open relay list that was falsely listing many domains as having open relays that did not (including ours). If you are on an open relay list, first be sure you don't actually have an open relay on your server, and then go to the listing web site and get yourself removed. Hope this helps!

Collapse -

Exchange 5.0

by jhicks In reply to Exchange 5.0

Turns out that someone was using the server as a spam relay. Upgraded exchange to 5.5 SP3 and stopped the rerouting of outbound mail. Thanks for the suggestion.

Collapse -

Exchange 5.0

by jhicks In reply to Exchange 5.0

This question was closed by the author

Back to Software Forum
3 total posts (Page 1 of 1)  

Related Discussions

Related Forums