Ok I am no emailer......but what I do have to say is that if you wanted to learn one of the best things you can do is sign up to lists....
One of the best ones I have found is http://www.fool.com/
otherwise known as "The Motley Fool"
I am sure you have seen their ads all overthe place ....anywho....
they have some awesome copywriters and you should def read there stuff you can't not open their email.....
here is a little gem I got today.....

and here is the start of the body.....

anyways as you can see they write really compelling stuff......
ignore the fact is stock stuff you can swap the topic as you see fit....
eg...diet
Your health club membership may soon be worthless. Here's why...
bizop
Your Job may soon be worthless. Here's why...
insert any vertical you want the point is the same......
learn and earn....
We've just recently decided to enter the penny stock and micro cap niche and this info is incredible and perfectly timed for us.
It will help us a lot in our email campaigns.
Thanks PB!