Does having an e-mail account set me up for online billing?

No, online billing is a separate system which needs to be signed up for independently of email.
To register, go to https://mdcom.convergentcare.com/mdcom/
validateSelfCareCustomer.do?action=initialize
and enter your account number in the New
Users section. You will need the PIN number off of your bill to complete this process. Due
to FCC regulations, Mediacom cannot give you the PIN over the phone. We can have a
letter mailed to you containing that number, or you may go into the nearest local office and
present photo ID, and we will be glad to give you the PIN.