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I have recipients who get two copies of e-mails if:

  1. His e-mail address is in the TO list and
  2. He is a member of a distribution list that is also in the TO list.

Because of how a particular application works, this scenario sometimes happens.

How can Microsoft Exchange prevent this situation and send the e-mails only once to each recipient ?

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Just to be clear, are you talking about An active directory Distribution list (group), Outlook Distribution list, or some kind of 3rd party mail list software? –  Zoredache Mar 3 '12 at 1:26
    
Are the distribution list and the user's email in different domains? –  Shane Madden Mar 3 '12 at 2:45
    
@Zoredache AD list –  Chris Dwyer Mar 5 '12 at 15:39
    
@Shane different (I suspected this might be the problem, but was unable to replicate the behavior in this scenario with a test DL) –  Chris Dwyer Mar 5 '12 at 15:39

1 Answer 1

up vote 0 down vote accepted

The distribution list and user's e-mail have different domains. I just made them the same.

@Shane Madden - if you want credit for this answer, add it, and I'll mark it correct.

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