Group emails to recipients in some outside domains not deliverable

Hello All,

     We are using Exchange 2003 v6.5.7638.1 on a W2K3 SP2 server. We have a Barracuda 300 SPAM filter that monitors incoming and outgoing email. We have users who now have not been able to send group emails that they were able to send a few days ago. We were hit with a virus that affected emails - which we resolved- but this seems to be the only change that we can see that would possibly affect emails. We checked with our ISP and Barracuda support and both confirmed we are not on any blacklist that would prevent these emails from being sent. We can send to these domains with a single recipient, but with multiple recipient emails to these domains (Aol.com, Yahoo.com, Gmail.com, for example) we are now unsuccessful. I am watching the queue in Exchange and they just sit there and retry. Our Barracuda is not blocking these emails. Any suggestions would be greatly appreciated.

thank you
Brian
KOCSupportAsked:
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KOCSupportAuthor Commented:
Just as an update- We uninstalled our AV client and re-installed it with just the basic protection and that resolved our issue. FYI in case this might help someone.
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KOCSupportAuthor Commented:
The undeliverable email states :

"Your message did not reach some or all of the intended recipients.

The following recipient(s) cannot be reached:

     "recipient name" on 04/08/2015 4:15 PM
            This message was rejected due to the current administrative policy by the destination server.  Please retry at a later time.  If that fails, contact your system administrator.
            <mail.koc-pa.com #4.3.2>"

thanks
Brian
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Will SzymkowskiSenior Solution ArchitectCommented:
This message was rejected due to the current administrative policy by the destination server

As you can see in the NDR there is a policy in place on the destination server which is stopping you from sending email do this domain. There is nothing you can do until this policy is removed and or modified. I would contact the recipients to ask them about the issue.

Will.
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KOCSupportAuthor Commented:
Hello Will,

   thanks for your reply. I contacted Microsoft about this (outlook.com) because certain group emails to 2 separate domains were coming back undelivered. The Outlook.com Sender Support Team stated they " do not see anything offhand with the IP (70.166.233.181) that would be preventing your mail from reaching our customers." Our Barracuda support tech said the same thing- he didn't see any reason why they would not be delivered and suggested that there might be some Exchange SMTP settings to look at.

thanks
Brian
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KOCSupportAuthor Commented:
We will also restart our firewall after hours just to be thorough, although we don't see anything in the logs to indicate an issue from the firewall standpoint.
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KOCSupportAuthor Commented:
Because we figured out the issue ourselves.
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