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Automatic rules to Internal distribution group failing when authentication is enabled

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Hi Forum,

I have set up a rule on a user's PC whereby when he (user@internal.com) receives an external email (from sender@external.com), it should be automatically forwarded to a distribution group (group@internal.com) with cc touser1@internal.com and user2@internal.com .

This worked well for some time until recently when it started failing. The only way we can get this working again is when we disable authentication to the distribution group (group@internal.com ). We do not want this disabled as we don't want the outside world to Spam this distribution group. No changes has been made to the system which could have caused this issue. 

Is there a way to get this rule working without disabling the authentication?

Cheers

Arvind


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