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Description
Upgraded from civicrm 4.1.2 to 4.3.4 (drupal 7)
Selected few groups to send mass email. Checked the box 'Remove Duplicate emails'
The Mailing Report (from Scheduled and Sent Mailing menu item) shows Successful deliveries (11000) almost twice the Intended recipients (6000). Clicked the Successful deliveries link and found that most of the contacts were listed twice.
This used to behave fine in 4.1.2.