Comment 32 for bug 357864

I was taking a look at what was needed to get a quick hack working for this.

Is it possible to override the email address supplied in nsIMsgIdentity? or will
this cause problems with later saving those values back to prefs.js or indeed
with offline mail sending?

What I was thinking was adding a quick hack around line 1827 in
MsgComposeCommands.js and if there is a user edited header "From" then set this
as the value in the identity returned from getCurrentIdentity. Is that even
remotley possible?

http://lxr.mozilla.org/seamonkey/source/mailnews/compose/resources/content/MsgComposeCommands.js#1827