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Bcc's are not sent by the Sendmail transport (they are handled correctly by the Smtp transport).
Posted by Matthew Weier O'Phinney (matthew) on 2006-07-11T10:39:42.000+0000
Fixed in 0.1.5 branch  and trunk 
Posted by Jayson Minard (jayson) on 2006-07-11T11:54:40.000+0000