2.) Putting message archiving functionality at the Internet gateway seems very efficient. But what is wrong with this picture?
Message archives can only archive messages that they see. If you are only concerned with archiving messages that pass to and from the Internet, then this might work. However, if your goal in archiving messages is to meet some regulatory requirement, it is likely that you will need to archive messages that are sent internally and never go to the Internet. In that case, you will need to have the archiving function attached to the user's mailbox rather than to a transport path out of the network. Only this can assure that you are copying every message that the user receives. If you are more concerned with archiving every transmitted message, then the appropriate place for the archiving function is the MTA or mailbox server that the user agent uses for message submission.
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This was first published in April 2005