I have done this as an opne url action in a extension object (Vizlib), like this.
This is a very simple solution and can be more advanced I think.
1. One table with mailadress.
2. Selection object with mailadress, for selection.
3. The 'Vizlib Text Object', with action "Open URL" and URL "= 'mailto:' & FieldValue(mailadress)
4. Choose an mailadress (2) and press (3), that startsup you local mail program.
Hope this gives some ideas.