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"Require that all senders are authenticated" not working properly

Windows 2003
Exchange 2007
"Require that all senders are authenticated" not working properly

Exchange 2007 has confused me again.  
I'm creating a distribution group just like I always have.  However, when I created the distribution  group "portal@company.com" and sent an email to it from my yahoo account, I receive a bounced email that says Exchange will accept emails only from authenticated users.  I've never had this problem before.   I went to portal@company.com's properties, Mail Flow Settings, and removed the check mark for "Require that all senders are authenticated."   Now, portal@company.com can receive emails from username@yahoo.com.  However, none of my other distribution groups have this problem.  They still have "Require that all senders are authenticated" check marked.  For example, sales@company.com works with the check mark.  Did I miss something?
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md168
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md168
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2 Solutions
 
Alan HardistyCommented:
Were the Distribution Groups that work with the "Require all senders are authenticated" enabled migrated from Exchange 2003?

Do you have Mail Non-Universal Distribution Groups and Mail Universal Distribution Groups and the Mail Non-Universal Distribution Groups work even though authentication is ticked?
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Alan HardistyCommented:
Having tested this out on my server - this works with Mail Non-Universal Distribution Group if the "Require that all senders are authenticated" is ticked or not.

So - the reason it works for some groups is that they are old style groups and either need to be deleted and re-created as Mail Universal Distribution Groups or you can leave them and know that everyone can send to the irrespective of the authentication check box.
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md168Author Commented:
I found the problem.  I have a receive connector for my relay.  I normally relayed through another IP address.  I added the new relay IP addresses to the receive connector and it works.
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md168Author Commented:
Thanks for the help.

The problem was my receive connector.
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