What I have to give for Company?
Fill all the necessary details in SIGN UP form. Make sure you are unchecking the payment option. Below is the screenshot of filled sign up form.
You may follow this below page for sign related details of Mailgun:
https://trainings.boltiot.com/courses/iotandml/lectures/6656741
Just put “Bolt iot student” there in the place of Company name and it will work.
Put “student” and continue.
Enter student in the company textbox.