The first thing you should do before you sign up for any paid to read email web sites is get an online payment processor so you can receive your payments. Here are the most common:

Paypal https://www.paypal.com/us/mrb/pal=XDR3XDQCQEZ4Q
E-Gold http://www.egold.com

Next, get a new email account. You will be receiving LOTS of email, and probably don’t want to clutter your personal or business email account. You can get FREE web-based email from Yahoo or Inbox.com.

Now you can start signing up for paid to read email programs. I can guarantee the programs listed here, but not any that are advertised on these sites. Beware, there ARE scams out there. Here are some fast-earning, well-paying programs that have served me well.
Http://cashdesks.com/pages/index.php?refid=lilmissy707
http://mail4seekers.com/pages/index.php?refid=lilmissyinc
http://www.mv10.com/pages/index.php?refid=lilmissyinc
http://www.readrevenue.com/pages/index.php?refid=lilmissyinc
http://www.ilovemails.com/pages/index.php?refid=lilmissyinc
http://www.cosplaymails.com/pages/index.php?refid=lilmissyinc

*NOTE* These programs are also a great low-cost way to advertise if you have any kind of advertising budget. Very responsive!