When to use professional e-mail address during PhD application
I am not aware of any guidelines on this, and doubt it will have any impact whatsoever (after all, your current position/university should be clear from your CV). However, there is another reason for using your personal email: access. If you apply for a job somewhere else, there is a good chance you will eventually lose your current professional email adress. And this type of correspondance can be useful to hold on to.