Student Invite Gmail


I am trying to invite my students to join cloud 9. I have contacted my tech department about white listing the email for the student email accounts. However, the students are still not able to receive the email. Students have a gmail account The tech department say that they need to know more information, like if support{at}c9{dot}io is getting a rejection message. What can we do to get the students signed up?


Could you send any specifics on this over to so we can take a look?