GNU mailutils is a powerful protocol-independent mail framework. It provides
a set of libraries for  writing flexible  mail-handling software, as well as
a number of  utilities for both  local and remote  mail handling. Among  the
utilities provided are pop3 and imap4 servers, sieve mail filtering utility,
mailx-compatible mail client and others.

NOTE: This package overwrite some files in Slackware's core packages:
- elm
- mailx

If you removed mailutils, don't forget to reinstall them again.