f13.net

Colleague sent an email to external mail (SMTP) and CC'ed the copy through Microsoft Exchange Server to another colleague.
Now the email won't stop duplicating itself in her inbox folder every day. Interestingly, the time stamp remained at Friday. Last week.

How can I resolve this headache?

She is using Outlook I assume?
Does she have the account set up as IMAP or POP?
If she has her email account set up as POP switch to IMAP. Make sure it is set up so that anything deleted in Outlook deletes it from the server as well.
Also see what time she has set between the "check server for new messages every X minutes" as sometimes people have this set to low and the program is trying to check to often and duplicates messages.
If all else fails delete the mailbox from her outlook program, and recreate it.

One or more of these has generally been the problem when I have had problems with duplicate emails being  downloaded.

Check to see if it is some kind of weird rule thing.

Hopefully not rule 34...

Need more info about the server setups and exactly which address is getting the duplicate copy. Are you saying:

Message was sent to a user residing on a non-Exchange server and cc'ed to someone who resides on an Exchange server? The same Exchange server was the sending server? The email is repeatedly showing up for the sender, the original recipient, or the colleague who was CCed?

grrr i dug the wrong servers twice....finally found that shit n deleted it in the SMTP server.

i really don't know why we need MSE accounts, seems like a possible cause of future fuck up cause people would just SMTP one email out and CC a copy through MSE to their colleague. recreating the issue.