Unable to track email invites for registered guests.

a guest registered after I sent them an email, but I have no idea who they are now. For example, lets say I invite dolad@duck.com. I would see them until they registered with "Pirate Master" Then Pirate master is invited to my party. Is there a way to see which emails have registered and replied from a certain email address?
 
sad I’m slightly sad
Inappropriate?
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