Every time you send a message to your subscribers, go out of your way and take great pains to give or tell them something that's useful to them, or that they want to hear. It can be very difficult, but the greatest efforts reap the greatest rewards. It'll be appreciated and when it comes to the time for you to offer something for sale, that's when you get your payback. If you can't think of anything useful to say, then don't send any email. It's server-based so you don't have to be online while messages are sent.
Interface looks quite professional, although it's fixed.
Makes it very difficult to subscribe - the user has to jump through all sorts of hoops to subscribe to your list and many people won't bother. Mail King More flexibility. You'll have to import the addresses into your list, probably by hand. A good text editor will help you do this. You have to stay online to send messages, since it's PC-based.