[admars]

I get this with Thunderbird, at first I found it annoying but it can be useful as i sometimes use another PC to send email from.

The way it acts, is not as if it is copying the mail to sent items and, to inbox, but as if it does send it to correct recipient and a BCC to yourself, as I found the version in the inbox arrives a bit later, sometimes if the recipient wrote a speedy reply, same time as proper reply.