Are the people in your office getting mutiples messages from ONLY you?
Or multiple messages of every email they recieve? Last off, are you
using Personal Folders?
What I was getting at is.. If you are in fact using Personal Folders,
once the .pst file get's over 1.7GB in size it's starts going haywire,
and whenever you send a message the recipient(s) recieve multiple
instances of the message and eventually you won't recieve any messages.