*****WHY YOUR EMAIL SUBSCRIBERS UNSUBSCRIBE****
Some 34.8% of consumers said the main reason they unsubscribe from marketing emails is because they receive emails too often, and 20.8% said they unsubscribe because they find the content irrelevant or not useful. About 16% said they had never signed up for the email list, and 13.7% unsubscribe because they don't trust the source for the email. [SOURCE: Email Marketing Daily]
I found this guide from Aweber (email marketing client/platform) that may help your business reap the benefits from successful email marketing. I know I'm learning to get better at it because email marketing has an ROI of 4,300%! It's invaluable that I learn this, and you might want to consider it too.