You'll want to know which ones came from which source so you can track them as a group. Plan to mail to them at the same time you mail to your house list, but you'll want to change the text of the appeal letters slightly to educate them about your mailing list organization. After a year or two, if these people haven't responded, it might be wise to drop them from your list.
The most important thing is to stay in contact with anyone on your list. Keep telling your stories and keep offering them the chance to give. Do you have a mailing list that you mailing list are concerned about over mailing to? This is a fine line that many Internet marketers walk when it comes to operating their email marketing business. Another thing to consider is are you irritating your list?
I know some people who do not want to mail to their list hardly at all because they are afraid to make them mad. There are a couple things you mailing list should keep in mind when you determine how often are you going to mail. 1. Do not sell all of the time! Your credibility and reputation will be enhanced if you go out of your way to help the people on your list.