qmail bcc function problem

[Philip N. Han]

Hi,   We have over 800 members and sent out newsletters using the Bcc function within Microsoft Outlook via qmail server.   Up to three weeks ago everything worked fine then we started to get a few (3 or 4) return e-mails telling us that all the email addresses were showing up in the body portion of the e-mail message. And, in some cases attached files do not arrive.   I checked all settings in Outlook and even reinstalled the program but this did not solve the problem.   The question now is  -  could the problem involve qmail server?   We just installed qmail scanner from  http://qmail-scanner.sourceforge.net/ .     Thanks for any help.     Philip N. Han