Outbox trace

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
Hi,
 recently i'm trying to create semi-remote mailing system (details are rather irrelevant, but i can provide such if needed), where multiple senders use same email address. Nevertheless their supervizor would like to have some insight on sent emails.
 However, to make it legal equivalent of paper-copy it has to be stored in 'outbox' on the server, as it cannot be re-send to any other email as 'backup' or 'confirmation' or whatever.
 Now, the question is: can blat leave a copy of sent email on the server? If not via smtp, then imap4 perhaps?
 If so, can someone hint me what should i look for?
 

 
 Cheers
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