Tuesday, September 3, 2002 08:17 AM
Mail servers don't "check mail". SMTP servers receive connections and make transfers. POP and IMAP servers provide access to mailstores (mailboxes, folders), when requested by mail clients. Usually an SMTP server drops off incoming mail for local delivery, to the mailstores/mailboxes, which are then served by POP or IMAP servers.
Mail clients "check for new mail", on their respective mail servers.