Mail Snoop Pro 

Mail Snoop Pro is an anti-spam and email notification application designed to monitor any number of Pop3/SSL Pop3/IMAP/SSL IMAP mailboxes, finding and deleting spam without disturbing you and alerting you when there is new mail you need to see
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MailBell 

MailBell is a utility that checks email on POP3, POP3-SSL, IMAP, IMAP-SSL, MAPI and Hotmail-Email accounts. It can notify you of new mail, can detect undesired messages and lets you delete mail with large attachments without downloading it.
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