pop3spam is a POP3 client which connects to a POP3 server and deletes unsolicited mail. It's possible to check for messages that exceed a certain limit and to scan header lines for special patterns (regular expressions). If a message has been identified as unsolicited, it can be deleted directly from the POP3 server without the need to download it first. Eventually your normal mail-retrieval utility (e.g. fetchmail) can gather all (cleaned) mail as usual.
