NOTE: FastCheck is no longer maitained and more likely doesn't work for now.

General overview
-----------------
EXTRA-REQUIREMENTS: MIME::Base64 perl module
Note: This feature does not work on FreeBSD.

Yahoo Messenger based fast e-mail checking. Switching this feature
on (FASTCHECK=1) will reduce significantly the time YoSucker needs
to determine whether you have some new incoming messages. The
YoSucker fetch-mail routine will then be launched only if there are
some new messages. Makes sense only only if BOX is set to Inbox.

PROs:
- saves much time - the time consuming parsing of yahoo web service
  will be used only when necessary - i.e. when FastCheck finds new
  incoming messages.
- increases efficiency
- uses much more sophisticated technology :-)
- is cool!!! ;-)))

CONs:
- will not work properly if you use YoSucker and Yahoo Mail web 
  interface at the same time. FastCheck returns the number of unread
  messages in your inbox based on Yahoo Mail information on what 
  messages have been already opened. This may not correspond with the
  YoSucker information as it uses a slightly different system to 
  distinguish unread messages. What does it mean? If you receive a new
  message and you go to http://mail.yahoo.xxx, you log on and read the 
  message, Yahoo will mark the message as read, and YoSuckers FastCheck 
  will return no new messages. However, if you run YoSucker with FastCheck
  switched off, it will fetch the "new" message you've just read...
- most likely won't work if you use PROXY

So it's 3 vs 2 - the PROs win!!! :-) Use FastCheck and let me know in case 
of any trouble.

Possible problems
------------------
- if you run YoSucker FastCheck=1 with wrong FASTPASS1 and/or FASTPASS2 
  your Yahoo Mail account can be temporarily blocked. In such case, you
  just need to logon Yahoo Mail using your browser and unblock your account
  like this. Then fix your FASTPASSes and re-run YoSucker...
- FastCheck won't work with some old versions of Perl
