ESMTP is a user-configurable relay-only MTA with a sendmail-compatible syntax, based on libESMTP and supporting the AUTH (including the CRAM-MD5 and NTLM SASL mechanisms) and StartTLS SMTP extensions. The doinst.sh script will create symlinks from /usr/sbin/sendmail and other typical sendmail paths to /usr/bin/esmtp if sendmail is not already installed. ESMTP requires LibESMTP, also available at SlackBuilds.org NOTE: The esmtp package conflicts with the stock sendmail package - you must uninstall sendmail before installing esmtp.