Resolved.
I had to hard code my host, user name and password in:
modxroot/manager/includes/controls/class.phpmailer.php
where
modxroot is the root of the modx installation on the server.
These are the three empty variables that I assigned values to in the file class.phpmailer.php:
var $Host = ""; //mail.smtphost.com
var $Username = ""; //emailusername
var $Password = ""; //emailpassword
I tracked this down by performing a text search on "mail(" in the file:
modxroot/assets/snippets/eform/eform.inc.php
and noticed the include path for phpmailer. (btw, great choice for a php email class.)
I am open to suggestions for alternative methods "approved" by and for modx.
This had absolutely nothing to do with eForm, so I apologize for posting in the incorrect forum. Please consider moving this topic to a location where some one might find the information useful.
Thanks,
Rich