Ultimately, spats happen, and unfortunately, email will repeat these spats verbatim. A better practice would be to keep these conversations out of the public sphere by using security software that prevents unauthorized forwarding of email. If you're going to have a little "back and forth" you should do your best to keep it private.

Particularly within the legal community, these days, they should know better. The following is an article about email misdirection: http://www.essentialsecurity.com/Documents/article9.htm