exchange 2000 error 5.7.1

[nohamsters]

Some of my users are receiving NDR with the following errors: I don't know if it is our server or the other domains.

The following recipient(s)could not be reached:

recipients name.edu on date and time
You do not have permission to send to this recipient. For assistance, contact your administrator.
<Exchange.domain.com #5.7.1 smtp; 5.7.1 Unable to relay for recipients name.

Clients:Outlook 2002, XP Pro SP1
Server: Windows 2000 Server w/sp3, Exchange 2000 server w/sp3.
Mail is flowing inside the LAN fine and mail to the outside is flowing ok except for this happening a few times a day to only a few users. Any help would be great.

 

[xmsre]

In most cases you have an internal DNS, there is a firewall in the middle, and your ISP hosts the external DNS. It's the external one we're worried about.


John Fullbright
MOSMWNMTK

 

[Davetoo]

xmsre,

My final post to you on this. Did you read the article I listed? It clearly states that the reverse DNS option in Exchange 2000 will not prohibit an email from coming into an Exchange server if the lookup fails, i.e. the reverse DNS option on Exchange 2000 only helps to slow down the Exchange server as it simply eats up clock cycles without really benefiting anything. That's why it's turned off by default.

I belive it is you that is misinterpreting my statements, but I can do nothing further to clarify what I've said. I'm talking about external email entering an Exchange server, I think you're confused with some other issue.



I'm Certifiable, not certified.
It just means my answers are from experience, not a book.

 

[xmsre]

I think I'll take the last word on this one. You still don't get the point.

If you configure exchange to reject incoming connections by specifying a domain name on the SMTP virtual server, and reverse lookup fails, the connection will be dropped.

http://support.microsoft.com/default.aspx?scid=kb;en-us;322358

 

[Davetoo]

Apples and oranges. We're discussing two separate issues.

Thanks.

I'm Certifiable, not certified.
It just means my answers are from experience, not a book.

 

[rtichnor]

We're all here to help. Let's remember that.