I do. I used to use my personal one, but I got so much spam. I just sign up on a lot of forums for post exchanges, and I'm not that interested in being a long-term member, so I just use a Mail.com email to bridge the gap.
I have a forum account that I use to register accounts with and my main one that I use for other daily activities. I find it easier to keep track of registrations and it keeps the spam out of my main email account.