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I have a Contact registered as MailContact and GuestMailUser. Can I delete the GuestMailUser without impact?
The GuestMailUser object is what is used to facilitate access to shared resources for the Guest, so if you are fine with them loosing access to any group/team/site, go for it. In contrast the mail contact object is just a placeholder for an email address, the only effect deleting it will have it that said address will no longer be visible in the GAL.
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