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 m...
