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Stephen said:eehost, mail.domain.com would redirect to the proper place, but can't directly have webmail on it, it could have links like now that go to the right location however
Hm. So, I tried adding a secondary CNAME pointing webmail.domain.com to hspheremail.info. The new CNAME took just fine (I even let it sit and mellow for 12 hours or so, just to give it time to "take"), but all I get when I try to hit it is a server error about the webmail.domain.com virtual directory not allowing directory browsing.
Try an A record like:
webmail.your-service-domain.com -> 64.187.103.185