Sieve scripting

Sieve (RFC5228) is a scripting language for filtering email messages at or around the time of final delivery. It is suitable for running on a mail server where users may not be allowed to execute arbitrary programs as it has no user-controlled loops or the ability to run external programs. Sieve is a data-driven programming language, similar to earlier email filtering languages such as procmail and maildrop, and earlier line-oriented languages such as sed and AWK: it specifies conditions to match and actions to take on matching.

Stalwart Mail Server includes support for JMAP for Sieve Scripts as well as ManageSieve, which allows users to upload and manage their Sieve scripts.

Please refer to the Sieve scripting section for more information about the Sieve scripting language and how to configure the Sieve interpreter.