Major Description
When getting married a common practice is to change of username. EG:
Alice MARTINEZ have an email address amartinez@domain.tld and gets married to Bob ERNANDEZ. She thus want to change her email address to aernandez@domain.tld, while preserving her data.
The data of the account need to remains accessible after the user change.
We identified a couple of data structures to migrate: forwards, mailboxes, ACLs, delegations, JMAP filters.
We thus believe that it is desirable to achieve modularity in order to leverage injections and simply defines steps individually.
