Before you can send any email using customized email templates you must supply email server setting in the Setup/Options section of the software.
Sending massive amounts of email is never a good idea. Our customized email templates are designed primarily for sending small amounts of email. Sending large amounts of email could cause problems with your Email provider and could cause problems with organizations you are sending the emails.
For large email blasts try an email service like "Constant Contact".
Contact RPT Software for more information if needed.