Some common additional services offered by Dynamic DNS providers include:
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Wildcards - allows for wildcard references to sub-domains. For example, if you register yourdomain.dyndns.org, your site would be reachable at *.yourdomain.dyndyn.org; for example, server.yourdomain.dyndyn.org, www.yourdomain.dyndyn.org, ftp.yourdomain.dyndyn.org.
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Mail Exchangers - Creates MX record entries for your domain so that SMTP servers can locate it via DNS and send mail.
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Backup MX (offered by dyndns.org, yi.org) - Allows for the specification of an alternative IP address for the MX record in the event that the primary IP address is inactive.
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Groups - Allows for the grouping of hosts so that an update can be performed once at the group level, rather than multiple times for each member.
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Off-Line IP Address - Allows for the specification of an alternative address for your registered hostnames in the event that the primary registered IP is offline.
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For information on setting up DDNS Profiles, see Configuring Dynamic DNS.
