It saddens me to write a review like this. I own a small yoga studio. Referrizer has been a terrible service for my business and it has cost me time and revenue that I would have earned with a competent company. All emails and newsletter emails go to junkmail. I reached out to several individual customers on my email newsletter list. All emails went to junk mail. I did this test again, after my customers made sure to accept emails from my company, and again all went to junk/spam. My open rate for emails with other services, such as constant contact, mailchimp, etc., was between 25% and 30%. With Referrizer it has been 7% or worse. In addition, all of their marketing materials are filled with errors. Sentence structure doesn't make sense, there are typos all over the place. It has been a big waste of time and money for my company. I hope this honest review is helpful for you and your business.