Just in case this helps somebody else in the future...
The information in this thread was good, but I still had problems.
The problem I had may have been specific due to the hosting company that I am using. www.mochahost.com
I confirmed the email address was the same in the "Host Settings > Advanced Settings > SMTP Server Settings" and "Admin > SMTP Server"
I was forced to use a static IP address for the SMTP server (supplied by my hosting company) and their specific requirement of the 2525 port. The SMTP Enable SMTP had to be disabled.
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My website is www.testcardatabase.com and I have email hosting with the domain (myname@testcardatabase.com)
I'm using DNN 7.0.2
Settings
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SMTP Server and Port = 203.95.224.24:2525
SMTP Authentication = Basic
SMTP Enable SSL = OFF (BOX NOT CHECKED)
SMTP Username = my email address (for example: myname@testcardatabase.com)
SMTP Password = password to access email address (for the example email address myname@testcardatabase.com)
I hope this helps someone,
Tony Huntimer
TestCarDatabase.com