===Using SME default dynamic client & external DNS CNAME entries===
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In many cases, you really do not need to use ddclient or some variation of it eg sme7-ddclient or smeserver-ddclient
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You can use the built in dynamic client for your main domain (accessible by running Configure this server from the admin console).
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Then create CNAME entries in external DNS records which point at the main domain name.
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SME will update the main domain name/dynamicIP change, and the additional domains will follow it as the external IP changes.
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The use of this method is only possible where the full DNS records are accessible & editable by admin users.
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In some situations with DNS service providers, these DNS records are not accessible, in that case you will need to use one of the ddclient methods.
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Also see http://bugs.contribs.org/show_bug.cgi?id=6206#c9 which says:
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"I notice that you mention two dyndns domains, but you should be able to set up domain2.x.y to be a CNAME for domain1.x.y, then configure domain1.x.y with the builtin client."