[Dovecot] imap, imaps, ports; config for secure-only service

[Timo Sirainen]

On Sun, 2010-08-22 at 16:47 +0100, Ron Leach wrote:

> But I want to force secure working - in some kind of secure-only mode, 
> so that internet-based users can reach the server securely.  So I 
> changed the protocols to:
> 
> protocol = imaps
> 
> with:
> 
> disable_plaintext_auth = yes
> 
> 
> In this configuration, TB could not connect on 143, but only on 993, 
> *and*, only if TB's SSL option is selected (not its TLS option).  This 
> was good, and bad.

You need either v2.0 or run two separate Dovecot installations with
different configs. With v2.0 you could do simply:

disable_plaintext_auth = yes
remote_ip 10.0.0.0/8 {
  disable_plaintext_auth = no
}

or something like that.