How can I send email to only selected contacts from the contact list?
I suppose this depends on whether you are using the Email List feature under Account > Email list or if you have just created an email campaign…
Using the Email List, you can create a List with segments and you can add segments to a Gizmo email campaign (that way you are just sending to a portion of your larger list).
Here is more info on that:
If you are just using an email campaign, the campaign will send the initial message to all active contacts in that campaign… and will then send reminders to anyone who is not a complete response…