CNAMEs totally work -- the problem is that they override MX records. Earlier on we used to encourage users to use CNAMEs, but then they would inadvertantly lose

CNAMEs totally work -- the problem is that they override MX records. Earlier on we used to encourage users to use CNAMEs, but then they would inadvertantly lose ALL their email, even if we tried to explain to them that they shouldn't use CNAME's if you have MX records on there. So we stopped telling people to do that.