When using Teamstack, users are able to save multiple email addresses in their profile settings. Users are only able to select one "primary" email address but can have multiple secondary email addresses associated with their account.

Users are able to log in with every email address that they have added to their profile and are able to use the "Forgot Password" function with both primary and secondary email addresses.
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Users aren't able to delete their primary email address. If the primary email address needs to be deleted, users would first need to mark a separate secondary email address as their primary and then delete the old primary email email address.

Users will only get notifications on their primary email and can only reset or change their password using the primary email address.