verification problems

I am a teacher and some of my students are signing up using our school email addresses. We look (even in spam) for the verification email and it never shows. I have checked with our technology department and supposedly they have allowed us to receive emails from Arduino but still no results. I was asked to contact you to see if there is a disconnect somewhere. Our email address all end in d93mail.com. If a student uses an email that is not associated it tends to go through and my own email seems to work, any suggestions?

Sincerely,
Kim Williams

Yours is the only account with a d93mail.com email address, but beyond that, there's little I can do.