Difference b/w eMarketing and internet or web marketing

What is the difference between eMarketing and internet or web marketing?

There is no real difference between eMarketing and internet or web marketing. However, with the arrival of mobile technologies such as PDA's and 3G mobile phones, as well as Interactive Television, both terms tend to be stretched to include these new media technologies. On the other hand, others would see eMarketing and internet or web marketing as subtly different, for example Chaffey (below):

internet [or web] marketing is achieving marketing objectives through applying digital technologies. (Chaffey 2006)

eMarketing is achieving marketing objectives through use of electronic communications technology. (Chaffey 2006)

Whilst this distinction is wholly acceptable, it is difficult to see where the distinction lies between digital technologies and electronic communications technologies, especially with the convergence of technologies such as mobile devices.