Per Char Jackson:
I never use the email service provided by an ISP because it ties me to that
ISP. I can't change ISP's without also changing my email address. So
personally, I would never base an ISP decision on the availability of their
email service.

And I take it a step further by registering a vanity domain name - so I
can hop from email provider to email provider without my address
changing.
--
Pete Cresswell