I have asked similair questions and this problem keeps taking turns. A little background:
Early febuary, we were using an open relay for 3-5 of our users who were using POP3 accounts. Our E-mail server was being used to send SPAM by outside sources so we closed down the open relay and mandated they all being on Exchange accounts. We were inadvertantly put on Yahoo's black lists and were unable to send any mail to people with Yahoo accounts. We requested our Domain be removed by submitting our IP (after closing the relay) and all was working great.
We did not think to check Yahoogroups.com (assuming they use the same blacklists) and have not been able to send E-mail to email addresses at yahoogroups.com. Our exchange server is set to try to deliver the messages in Queue 3 times, to e-mail delivery delay after 12 hours and deliver failure to deliver after 24. Here is what we get:
12 hours: 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.
Will-Retry-Until: Sun, 2 Apr 2006 13:08:24 -0600
Your message did not reach some or all of the intended recipients.
Subject: RE: Please respond!
Sent: 3/28/2006 5:36 PM
The following recipient(s) could not be reached:
firstname.lastname@example.org on 4/1/2006 9:54 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
Additionally, in looking at the Queues in System Manager, we find the messages in the queues, some messages listed as Retry others listed as Delayed.
We have Exchange 2003 server using GFI for SPAM monitoring (in house on the exchange server). We can e-mail essentially everyone else without problem, but in looking at the queues, nothing is being sent out to the Yahoogroups.com domain. Server is Virus/Spyware free (Symantec Corp 10.0)
What's the problem here and who is it with. It seems that our domain cannot connect to the yahoogroups.com domain to deliver mail, which I assume is why the mail is being held in the queues.
If it's a problem with us, where can I look to get it resolved. If it's a problem on Yahoo's end, what can I send them to show that they are blocking our domain.