We have all seen it. Some people often CC themselves on an email they send. Why?<p>Best reason I've thought of so far: They use Microsoft Outlook and CC'ing themselves inserts their reply into the thread view, as well as makes the email searchable in the inbox (not just sent mail).
Both of these and when I send from my ERP, if I don't CC myself, there will be no (easily) searchable/usable copy, or proof that it was sent. Plus it makes it easier for follow up emails.
to have a copy to store in the same folder as all the other related mails (you could technically move it from your "sent" folder, but then you can't find it there, or you'd have to copy it, which I'm not sure all mail clients do or like).