This document briefly explains how to configure
Mutt-i
,
PGP
and
GnuPG
in its diferents versions (2.6.x, 5.x and GnuPG), noting the common problems that can occur while sending signed or encrypted mail to be read by mail clients not PGP/MIME compliants as defined in RFC2015 and in other operating systems. It also includes an example of procmail configuration to send the public keys automatically to received e-mails asking for it, as a key servers does.