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Is it possible to change an e-mailadres of a guest in Groups
Can a group-owner change the e-mail address of a guest, when the guest has a new e-mailadress?
Nope. What you can do is remove the Guest user and add him with the new address.
Yes, Guest users are represented by a mail user objects in the directory so you can use the relevant Exchange cmdlets. For example:
Set-MailUser alias_of_external_user -WindowsEmailAddress newaddress@domain.com
Oh sorry, I'm not the tenant owner! I can not use; Exchange cmdlets
Is it possible in the group in Usermanagement, where I can also add users/guests?
Nope. What you can do is remove the Guest user and add him with the new address.