Some Emails timeout

[TysonLPrice]

We are using Outlook 2002. We also recently upgraded the Symantec virus software to 9.0. It seems that shortly after that the following occured.

A small percentage of our Emails send a warning after a couple of hours saying:

This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.

Then several hours after that we get a message:

The following recipient(s) could not be reached:

'XXXXX'on 8/11/2004 2:38 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<XXXXX #4.4.7>

I'm replacing the actual Email addresses with XXXXX for this post.

I don't see where we are on any Spam blocking lists. I can send hotmail to the sites that are failing so I know it is not on their side.

What seems strange is it only happens to a small percentage of our Email. Any thoughts or tools on finding out what is going wrong?

 

[cmeagan656]

Do you have a reverse DNS (PTR record)? More and more mail servers are requiring you have one before they accept your mail. Although, usually you get the bounce back right away or not at all (some mail servers just drop the message).

Cheers.

 

[TysonLPrice]

Yes we do. I'm really stuck here. The error message doen't tell me what's going, i.e. the reason it's just bouncing around. Out of about fifty some clients it's only affecting five I know of.

 

[TysonLPrice]

It looks like the virus software was keeping them from going out. Thanks to the folks that responded.