A couple of years ago, I suggested people not use their Internet service provider’s free email address.
Earlier this year, a podcast I follow made five arguments against using ISP addresses. I agree with everything in the podcast except for the implication that a GMail address could be more professional than an ISP’s email address. Neither one is professional – if you run a business and you have a web site, the email address ought to match the web address for your company’s site.