GSA Search Engine Ranker comes with a set of temporary emails, but they are not ideal for projects. So it is also essential to use quality emails that can benefit your project and as well as to improve the LpM and VpM values of the projects.
You can use any email service from Catchall to Yahoo, Yandex, Gmail, Hotmail and Protonmail, etc. Adding emails with multiple services can make your project results look more organic.