I am an amazon seller and own some of the brands. I signed up for mail.com paid service in the hope this will be great. Their security team blocked my account due to suspicious activity at 9 AM approximately on Sept 5th 2017. I logged two cases and called twice and was told that the case has been escalated to Level 2 Tech support, which by the way is never available on phone. As of 9 PM the account is still blocked with no access to my emails. I have no idea how much is this mistake of using them is going to cost my business probably atleast 50 unhappy customers and atleast revenue worth 5- 7k.
Have you ever heard of paid email service that doesn't have any tech that you can talk to. I can call my cellphone company and complain about something and get facetime with a support tech. Please never use their email!