Accept email addresses of the form name@a.b.c

In setting up my new Ring account today, the verification email never arrived at my email address, which has fhe form: firstname.lastname@alumni.school.edu - i.e., name@a.b.c. I had to change to another email address name@gmail.com. That worked. So, even though there was no error message, it appears that the Ring app / account system does not accept email addresses of the form @a.b.c. I would much prefer to use my primary @a.b.c email address; I rarely use my @gmail.co