I used Mailshot every since I got my first Apple product, iPhone 4. I’ve since updated to Pro version. I like how a can duplicate or copy a group, check and uncheck and delete addressees within my group. Particularly I like taking two column of name and email in Numbers and pasting in Import into Mailshot, and immediately create a group. In Numbers I write a formulas that inserts a “<“ at the beginning of an email address and “>” at the end. With the contacts name in the first column and the addresses formula in the second column, I simply import and manually paste. This creates is one paste my whole list. Easy as pie. The formulas is created once and is copied down in Numbers. Sweet!