Good point AndrewR... Should also be in the sticky for pilots starting out to not email their prospective bosses with an email like
[email protected] or similar.
I don't see a problem with individuals using free email servers - hotmail, gmail etc. It's "the cloud" - very much the fashion. I can see some people might turn up their noses at hotmail, but I don't really see why, for an individual.
Not so good for companies - if you are representing a company, you should have a company email address. Business email addresses at some generic ISP suggests too small to be bothered arranging a mail server. If you're an electrician, that's probably OK. A company with many employees, not so much.