If you are still not aware of it, email marketing is one of the best converting online marketing strategies out there.
The important thing to take note of is to build a list and take care of the people who have subscribed to you. It's not just blasting them an email every now and then.
It could be overwhelming. But, with the help of email marketing software (here is a good list with all the alternatives: http://www.staff.com/blog/comparison...tware-options/
) this strategy can be done and could help with the profitability of the business.
I've done it and is still currently doing it.