Just wanted to post this here for others, from netapp support, fixed the problem for me (this was for VSC 2.0)
From what I understand, the case was opened because you have disable IPV6 following MS http://support.microsoft.com/kb/929852 on both the server for the restore and vcenter where svc is installed (rebooted both) - problem still occurs.
There is a bug related to this, the link is below,
Same here, i'm running SMVI 4.2.1 installed about 6 weeks ago and i have the same "bug", i've followed the fix here to edit the wrapper.conf file, rebooted the vCenter server but still get an IPv6 address in the SFR mails and backup notification mails. SMVI plugin has also been removed and reinstalled but still the same issue.