ListProc is a commercial product produced by CREN that is based on the free package Listproc. List archives may also be set up to be accessible through the web. The mail filtering FAQ gives examples of how to filter and sort mail with various different UNIX packages such as procmail, filter, and mailagent. Procmail is a C program written by Stephen R. van den Berg that can act as a mail delivery agent and can automatically process and sort mail as you receive it or after it is already in a message folder. Procmail recipes can be a complex mixture of header information used to separate mail into different folders.
Filter is a mail sorting program that comes with the elm software.
Filter is invoked through the .forward file as procmail can be. Mailagent is automatic mail-processing tool written in perl, written and maintained by Raphael Manfredi. Mail Clients Rmail is the default mail package distributed with emacs . Rmail is a major mode within emacs and stores all its mail folders in babyl format. Vm is a highly extensible emacs add on mail package written by Kyle Jones that stores mail in regular UNIX mail format.