How to block a particular email in IMAIL

The "Block Senders" option allows iMail users to block addresses from which they don't want to receive mail. Incoming mail from addresses on the list will be deleted automatically.
To add address to the blocking list, just
->Enter your iMail Personal Settings
->Select the Block Senders option, and
->Enter the full email address in "user@domain.com" format
Please note the followings when using the "Block Senders" option:
->You can put up to 50 email addresses.
->Messages from those senders will be deleted automatically.
->It applies to messages being delivered to the INBOX only.
(The "Block Senders" option is particular useful for iMail users who are using PC-Pine or users who will access to their mailboxes from different machines (no need to set Message Filters on those machines again).
Also check this link which will be more useful
http://skc.smyrna.k12.de.us/users/cbush/block.htm