This isn't http, there is no redirect command. Also the two protocols
are completely different and non-compatable.

The normal option for this is to just require encryption, then if they
use normal IMAP and attempt to do anything except secure it using TLS,
the connection gets dropped.

Quoting Frank Bonnet f.bonnet@esiee.fr:

Hello

Is it possible to configure Dovecot (2) to "redirect" IMAP
connexions to IMAPS ?

I know it would be possible with ipfw on the server but I wonder if dovecot has such capability.

thanks