It usually is not a problem to have multiple A records pointing to the same
IP address. Upon reverse lookup (usually not a problem with web servers, it
is with mail though, do not have a mail server listed with a CNAME record).
You could make domain.com the A record and make an CNAME for WWW and this
wouldnt be a problem.
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see this url: http://www.iea-software.com/maillist.html