This is a replacement for MailHost which gives you ESMTP access (username/password). Go to your Products directory and untar (tar -xzf).
NOTE - version 2.0.0 is ONLY for zope 2.3.x. version 2.5.0 is for zope 2.5.x
Zope Version (Zope 2.7.3-0, python 2.3.4, freebsd4)
Python Version 2.3.4 (#2, Feb 1 2005, 23:07:33) [GCC 2.95.4 20020320 [FreeBSD]]
Plone 2.0.5