Send as.. or send with..

[Martijn Kluijtmans]

Is it possible to add an "Send as.. or send with.." button (I don't know 
which one is correct english)
I have two SMTP servers, now I have to change the default smtp-server, 
before sending a message.
It would be easier to select the smtp-server just before the message 
will be sent.

Thanxs,
Martijn