> J2 Global operates numerous, nearly identical websites such as eFax.com, RapidFax.com, MyFax.com, MetroFax.com, SmartFax.com and Fax.com that all offer the same internet fax services. As a result, J2 effectively controls over 90% of the internet fax market.

> ... the methodology of litigation that J2 employs has allowed for them to sue any competitors for infringing on a patent held by J2 over all faxes using an email, regardless of whether they are using PHP, SMTP or .NET gateways in the emails.

Source: Used to work for, then own a fax brand many years ago.