I know some professionals that still use AOL, GMail, Hotmail, or local ISPs. I find it unprofessional, just like cookie cutter websites. I avoid using or recommending them simply because I firmly believe professionals need to maintain a certain image. While I dress very casually (my clients seem to appreciate it), I am a lot more formal in other regards, including branding.
My website, for example, uses domain of cornerstonecpasolutions.com but it is too long for e-mail. I own A LOT of other domains for future use, but currently have chosen to use hhicpa.com as a redirect domain to my website, and it is also the e-mail I use for all of my firm's e-mail addresses. Six letters is a lot simpler for people to remember, and it means something to my client base.