Good online marketing

Another good example for online marketing is always let user's know your website is always active.

For example.

once every 2 weeks or a month, we just can say hi or greeting to all user registered on your shopping cart system telling that you're happy they register on your website.

you can use,

Subject:

Greetings from Yourwebsite.com

Dear Apis,

We hope you enjoy your stay with us at yourwebsite.com

Thank you.

This is some good example. maybe giving you idea in another creative way. :)