Take the 2-minute tour ×  One of our clients has been having
problems where whenever an external email has multiple
recipients on their domain, each recipients receives it a
matching number of times (see below). This only occurs for
emails originating from outside the company.    • To: 1 user; 1
email received   • To: 3 users; 3 emails received per user.   •
To: 1 user (+1 gmail address); 1 email received per user.   •
To: 2 users (+1 gmail address); 2 emails per user (1 email to
gmail)   • To: 1 user, CC: 1 user; 2 emails per user  This is an
up-to-date Exchange 2003 Server (SP2) on an SBS2003 Server. The
Exchange server connects to the MTA via POP. The Exchange
databases are not near their capacity. All email scanning is
disabled in McAfee.  We have checked with the MTA and only one
email is being sent to the Exchange server per user.  I have set
up 3 test accounts to eliminate any chance of it being related
to rules that have been set up specific to users in either
Exchange or Outlook.  share|improve this