Avelsieve or, verbosely, "Sieve Mail Filters Plugin for Squirrelmail" 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
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Messaging Server and Isode M-Box.
Sieve is a mail filtering language, intended for server-side filtering of emails. For more information, see RFC 3028. [Less]