Users not receiving specific mail in Exchange 2010

We're subscribed to a newspaper mail newsletter and we have a problem with 2 users.

These 2 users don't receive the mail even when the other members of the mailing list get it without a problem. I checked the Firewall Log (Watchguard XTM330) and there is a entry for the email entering and passing through the SMTP proxy for every user, excluding the ones that don't receive it.

After many test two weird things happened:

If the usual sender of the newsletter does a resend to one of the users who doesn't receive the email, we receive it without a problem.

If the problematic email is sended to a distribution list that includes the 2 uses that doesn't receive it, it arrives to their mailbox without a problem.

Any idea what could be causing this issue?

Thanks in advance!
ScreenFoxAsked:
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Sumit GuptaSystem and Virtualization EngineerCommented:
Check if there are any restrictions in Distribution group:

http://exchangeserverpro.com/restrict-distribution-group-exchange-server-2010/
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Sumit GuptaSystem and Virtualization EngineerCommented:
Also check these users are using Outlook client if so then

Do a search for the email chances are it's going to a different folder. You can start outlook by going to start, run and then typing outlook.exe /cleanrules

This will delete any and all rules thus ruling out if it is a rule that is causing this. You can also have the user log into OWA and see if the email shows up. If it does then it's something local which again is either a rule, or some third party plugin causing it in which case follow the instructions above but this time use the switch /safe which will start Outlook without any addins or plugins.
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ScreenFoxAuthor Commented:

Check if there are any restrictions in Distribution group:

http://exchangeserverpro.com/restrict-distribution-group-exchange-server-2010/

I don't think the problem is with the distribution list, as it does arrive when its send to the distribution list, but if it is send to those individual users it does not arrive.


Also check these users are using Outlook client if so then

Do a search for the email chances are it's going to a different folder. You can start outlook by going to start, run and then typing outlook.exe /cleanrules

This will delete any and all rules thus ruling out if it is a rule that is causing this. You can also have the user log into OWA and see if the email shows up. If it does then it's something local which again is either a rule, or some third party plugin causing it in which case follow the instructions above but this time use the switch /safe which will start Outlook without any addins or plugins.

I already checked, but from reading the logs on the firewall it looks like the email isn't even reaching the network, so I don't think it even has a chance to reach the exchange server or outlook.
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Sumit GuptaSystem and Virtualization EngineerCommented:
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ScreenFoxAuthor Commented:
Well I checked and the Exchange server does not have any transport rule created.

Also, the mailboxes that are not receiving the message don't have any exception in the mail the can receive.
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ScreenFoxAuthor Commented:
Solved.

The sendind server had those 2 addresses blocked for some reason.
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ScreenFoxAuthor Commented:
The problem was on the sender side, not on our own.
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