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Note that it is not possible to change a user's email adressaddress. In case a user's email address changed, please download all the documents of signed envelopes (if not done before), and then create a new user with the new mail address and let the user log in to be sure the user was activated and is working as intended. After that, delete the user with the old email address. During deletion of the user, you will be asked to reassign the in-progress envelopes, drafts etc to another user. Here you can select the newly created user.
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