users recieving email in doubles

Im running exchange 2003 and 2010 in a coexisting environment. Some of my users are recieving emails in doubles. Internal and external emails are being delivered to users in doubles. any ideas?
DEFclubAsked:
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SergConnect With a Mentor system administratorCommented:
Make sure the account you're checking only appears once.  They may not have the same name but could contain the
same login info.
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Rajkumar-MCITPConnect With a Mentor Commented:
1. did you perform a message tracking, is those email send only once by server? or twice ?

2. do you have any antivirus software installed on those machine and enabled and option to scan the emails?, can u try to disable it for testing and check the status?

3. issue for mailbox in exchange server 2003 or exchange server 2010?
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DEFclubAuthor Commented:
Not seeing doubles sent in message tracking.

Exchange users Symantec for MS Exchange, yes scanns emails

Clients use Symantec SEP w/ out email scanning

seems to be realted to mostly exchange 2003
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DEFclubAuthor Commented:
thxs
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