Exchange 2010 the distribution group setting "require all senders are authenticated" is not working

Powershell shows "RequireSenderAuthenticationEnabled     : True" and I do not have "Externally secured" checked on any receive connectors, but I can still send to this group from the outside. I tried deleting and recreating the group, but it still accepts messages. Email comes in from a local Spam server. Any Ideas?
AntExpertIT ManagerAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
If you send from a legitimate email youremail@gmail.com to this group does it work? Sometimes spammers still find a way to mask the domain which allows the email to pass through. If this is strictly a spamming this you might want to take a look at your spam filter to see if there are any other logic rules you can put in place.

However, you are always going to get some sort of spam even with the best spam appliances out there.

Will.
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AntExpertIT ManagerAuthor Commented:
I can send from a generic gmail account to this group yes, or any group for that matter, since the "require all senders are authenticated" does not work.
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Will SzymkowskiSenior Solution ArchitectCommented:
Does this happen for any group that are you using with "Require Authenticaiton Enabled True"? or just this specific group.

If this affects all groups then i would look at our Receive Connectors and make sure that the proper permission groups and authentication on the default receive connector and also any custom ones you might have as well.

If all groups are acting this way then something has changed at the org/recevie connector level.

Will.
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AntExpertIT ManagerAuthor Commented:
Yes all groups seem to ignore this setting and I can't identify whats wrong with the receive connectors? Email is delivered from a local spam server, could that have something to do with it?
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Will SzymkowskiSenior Solution ArchitectCommented:
It is possible. Not sure why all groups would have this setting ignored. Have you tried to check the permissions on your default receive connectors? Also have you tried to re-create them?

Will.
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AntExpertIT ManagerAuthor Commented:
I just connected to the Exchange server via telnet, and it does reject messages to the group and indicates that authentication is required, so based on that, it appears the server is doing what it should. It must have something to do with how the spam server is forwarding messages to Exchange. If you have any ideas on how this should be configured,  I would appreciate your input.
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AntExpertIT ManagerAuthor Commented:
Found the Solution. We are using Symantec Brightmail Gateway for email Spam filtering. There is a setting on the server under "address resolution options"  called "enable distribution list expansion" that was checked. I unchecked this option and everything is working as it should.

Thanks Will for helping.
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AntExpertIT ManagerAuthor Commented:
I discovered that the exchange server was not the problem by using telnet.
I then began to research my Spam server and discovered the fix to the problem.
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