[Dovecot] Force STARTTLS on port 143 for !internalnetwork

[Ralf Hildebrandt]

Hi!

How can I force users which are connecting from OUTSIDE our newtworks
to user STARTTLS on Port 143?

Right now we resort to IMAPS on port 993, but an additional STARTTLS
enabled login on the default port would make things easier!

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de