which pop3/imap secure method should I use?

[LeVA <leva@az.isten.hu>]

Hi!

I've configured a courier-imap server with pop3(-ssl) and imap(-ssl) support.
Now I can not decide which combination of methods is the most secure (first of 
all) and most usefull (lastly) for me.

The courier server supports both SSL and TLS, and I can use PLAIN and CRAM-MD5 
methods for authentication.

My mail user agent supports all of the above, so I would really appreciate if 
someone could tell me which configuration is the most secure way.

Thanks!

Daniel

-- 
LeVA