Hey NewsGuy!
Are you talking about having an ad in your daily mailing? If so, that's pretty much expected in any newsletter.
But you said you're "building" a list, and I wonder if you mean adding an ad in your own email ad campaign. If this is the case, I wouldn't recommend doing that since you're trying to get people interested in what you're offering.
Did that answer your question?
Diane
The business writer who helps people grow their small business
http://www.BouncePublishing.com