When a sender's email get changed, in order to preserve the completed, archived and ongoing transactions, one of the underlying solution is to invite a new sender under the main account, then assign one-to-one delegation to the new sender. This tool could help you streamlined this process in batch by inputting a CSV file.
In order to run this tool, you will need the following:
1. API key or Username + Password of your account
2. a CSV file contains sender's information. (A sample file has been included in the attachment showing you the expected header format)
Sender information:
Firstname, Lastname, Email are specified per sender. Company name and whether to Activate your senders immediately are set in batch.
If you encountered any questions towards this tool, feel free to make a post at the Developer Community Forums!