Changing a mailbox is child's play in todo4teams. You click on a mailbox in the overview and the dialog for changing a mailbox opens immediately. There you make the appropriate changes and press "Save". The mandatory fields

• Email Address
• Incoming Aerver
• Outgoing Aerver
• Email User
• Email Password
• Type
• Takeover mode
• Addressee

are marked with a red star. If a mandatory field is invalid (e.g. if you delete the mailbox's email address), it will be highlighted in red and the "Save" button will be deactivated so that the mailbox cannot be saved in an inconsistent state:

If you have made changes to a mailbox and have not yet saved them, todo4teams will ask you whether you want to save or discard the changes so that no changes are accidentally lost: