TODO
====
+o Do we add support for spaces in IMAP or POP passwords?
+o Set real application name instead of using argv[0]...
+o Create a test application to send responses in multiple
+ packets.
o Add support for multiple accounts;
+o Add support for local mailboxes;
o Implement correct method for checking new messages with
IMAP (don't use RECENT command, but NEW command);
o Implement the volume for the console beep;