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Hello,
Thanks for the question about keeping your email secure while a third party works on your website. The best way would be to provide only FTP and database access as is necessary for the developer. They would not need to have access to the cPanel interface for your site in order to work on your website. Check out Giving your Developer Account Access for specific ways to limit access for your developer/designer.
I hope that helps to answer your question! If you require further assistance, please let us know!
Regards,
Arnel C.