[Dovecot] Sending email using IMAP

[Marc Perkel]

This is something for after the 1.0 release but I think it's important 
and I'm going to try to figure out how to make it happen. I'd like to 
see some way to pass outgoing email from Thunderbird back to dovecot 
through some new command that we would have to make up. Email would be 
sent back over the IMAP connection and when Dovecot gets it dovecot 
would hand it off to an SMTP server that would deliver it.

If a crude experimental spec can be written I'll try to find someone on 
the Thunderbird side to write some sort of module to talk to it.

The reason for this is that I think that the elimination of SMTP from 
the client is a big step to control spam. The idea being that if IMAP 
can transfer outgoing mail the SMTP wouldn't be necessary for clients 
and we can block port 25 on windows machines and viruses can't send 
email. And the virus wouldn't have access to the IMAP password so 
viruses can't authenticate to send mail.

So - the key question is - what would it take to create an outgoing spec 
for sending email over IMAP? Like to see something clean and simple.