Some professors are just really, really bad at email. When my daughter was auditioning 8 years ago there was a prof who only communicated via fax. Even then, fax was completely outdated. It was as if were sending messages by carrier pigeon or something. And then a funny thing happened: when he accepted her to his studio she got an email via his wife’s account. I always wondered, if she had gone on to study with him, how would they have communicated.