Pocket SpamFilter 126.96.36.199
the author of this app says:
This helps you keep your e-mail account free of spam. It supports an unlimited number of POP3 e-mail accounts. You can download information only, headers, headers and lines, or the complete body. Delete e-mails without downloading, and create filters for sorting mail. You can filter on any part of the message with string searches, regular expressions and wildcards.