You can create an email group which you place mailing list these people into, and whenever you want to send out an announcement, you simply mailing list send out an email to the entire group. If you're using programs such as Hotmail or Outlook, make sure that you put your group email in the BCC category, otherwise you'll send out the entire mailing lists email addresses to everyone.
There are also programs available which will make life even easier. How to get subscribers This can be the hard part because you want to create a group of fans who have chosen to sign up and hear more from you. Therefore, you should be careful not to market mailing list too aggressively and should instead allow readers to make up their own minds about joining. Put a note in the back of your books.
One of the joys of self publishing is that you decide what you want in your books, and you can update at any time you want. At the end of all your books you can tell people briefly that you have a mailing list to sign up too, and encourage them to join if they mailing list want news. You can even include hyperlinks straight to your mailing list in the back of eBooks. Advertise your mailing list on your website.