Port numbers
------------
pop3: 110    pop3s: 995
imap: 143    imaps: 993

The file ssl.pop3 shows how to do a connect to a remote
host using SSL, for testing.  Likewise, ssl.imaps is for SSL imap.

sample transactions
-------------------

pop3: (unencrypted)

telnet myhost 110
user joeblow
pass passwd
list
quit

pop3s: (SSL encrypted)
openssl s_client -debug -connect myhost:995
(you will see SSL stuff go by, then)
user joeblow
pass passwd
list
quit

imap: (unencypted)

telnet myhost 143
xxx login joeblow passwd
xxx select inbox
xxx logout

imaps: (SSL encrypted)
openssl s_client -debug -connect myhost:993
(you will see SSL stuff go by, then)
xxx login joeblow passwd
xxx select inbox
xxx logout