IMAP tunnel thru http proxy - possible?

[Deboo <deboo@debian.elitemail.org>]

   I just have http access from office (thru a proxy gateway), and
   no outside POP/IMAP/SMTP access. Is it possible to somehow tunnel
   all the IMAP(S)/POP(S) requests thru the proxy? The proxy allows
   http/https and ftp only.

  Do point me where I can get more info about this or how to do this or
  some kind of howto or links to any such place.

Much appreciated.
Rgds,
Deboo