Email marketing should be one of the arsenals to be used by an online merchant. To send an email to one of your customers is as simple as eating peanuts. However to send emails to hundreds or thousands of your email list members is like eating a sack of peanuts in one hour! That would certainly be impossible!
But this is not impossible to many successful online merchants. Their solution is automation. They simply use an email marketing software. One of the best email softwares is Mailloop. So far, I know of several successful internet entrepreneurs that use Mailloop.
If Mailloop would work for them, there is no reason it wouldn't work for your email marketing success.