The last time I checked, everyone.net no longer offerred the service for “free”. DH used Big Mail Box for a while, but I think that has gone away also.
You can always “manually” set up as many email boxes as you want on your DH account, but I’m not aware of a “free for anyone” provider you can set your MX to like everyone.net in the “old days”. You can probably thank the spam-meisters for that; I know I wouldn’t want to share an email server with anyone who was passing out “free email” programatically!
All it takes is one idiot to get the shared server blacklisted / blocked, then we are all screwed. Bad enough as it is, with AOL blocking the occasional DH server off and on/ from time to time as it is.