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Avelsieve is a Squirrelmail plugin for creating Sieve scripts on a Sieve-compliant mail server (usually either IMAP or MSA/MTA). Some Sieve-compliant servers are Cyrus IMAP, DBMail, Sun Messaging Server and Isode M-Box. Sieve is a mail filtering language, intended for server-side filtering of emails. For more information, see RFC 5228 and