Warren (mailing lists) wrote:
Mail eXchangers should never be CNAMEs. If you find anyone who has an
MX record pointing to a CNAME rather than to an A record, or even to an
IP address they are configured incorrectly.
W
Correct, according to the RFC. I tried to tell Sympatico cable that
(200,000 subscribers), but they didn't want to listen. I think AOL may
do this as well. If nothing else, it's a way to keep the average spammer
out - look at all the extra work you have to do to get these domains to
work right; spammers usually aren't up that long.
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