Some places just point thier MX records to the root domain, some point it to mail. If pointed towards mail then you need an A record to tell the mail subdomain to point to the right IP.
I found 1and1 DNS settings to be a bit limited
---------- Post added at 19:21 ---------- Previous post was at 19:19 ----------
Quote:
Originally Posted by Rob
I presume that the mail bit acts as a catch all for all email without messing up anything else?
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It's actually just conventional naming.. MX can though point to any name and as long as that name has an A record associated with it the setting will be OK