Time out sending email to some external addresses

[Eng2003]

Hello,

I am getting the following error when sending to an outside email. It is not happening to everyone just a few. Here is the domain worldnet.att.net. The message is as follows:

'email@worldnet.att.net' on 10/30/03 10:13am
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<mail.domainname.com #4.4.7>

Has anyone ran accross this and may have a fix for the situation?

Thanks,

Eng2003

 

[bluepill]

I am getting the same thing but to only a handfull of domains. (hotmail, earthlink) It started on Monday Nov 3rd.
I can telnet (port 25) on the remote server with no problem. The email retries and after about 6 hours I get this message in the sytem manager.

&quot;The connection was dropped by the remote host&quot;
or

&quot;An SMTP protocol error occurred&quot;

I asked hotmail is they had us on a RBL or any whitelist, but have not heard from them. Any help would be appreciated.
Thanks

 

[Mrozek]

Experiencing the same problem myself as of 11/6. However, that is the day we switched T1/DNS providers so I'm guessing it is the same problem initiated differently.

Do your reverse lookups translate to the best address? A few months ago we started getting blocked because our reverse looked as though the address was a dynamic dsl address (which they want to block). So we had our ISP change our PTR and that fixed the problem.

 

[bluepill]

I changed my dns settings to point to an external address.
I stopped/restarted DNS service. ( I changed some wierd DNS entries that did not belong.)
I stopped/restarted the SMTP service.

I got out to hotmail! (users are happy)

I also changed the DNS settings in my SPAM filter. (Externally)

I am still getting some bounced email and I took my spam filter out of the mix totally. I believe that some DNS entries were discabobulated. ( I think that its fixed)

Right now everything works.

 

[stuhall8]

Also had this same problem....it turned out that our DNS Servers had cached information for the domain that was not receiving email and they had made DNS changes. Once we flushed our DNS Server's cache we resolved the new servers and everything worked.