The DKIM authentication check will satisfy many email filters that the PIN email is genuine. However, there are other factors outside our direct control which may cause aggressive spam filter settings to reject these emails.
Check the server-level filter policy.
The admin for your school email service will need to check this.
The above email address (or the domain 23equations.com) needs to be added to the "Safe Senders" or "Approved Senders" list.
Methods for doing this are well documented but the exact method will depend upon the service provider you use and also the service level of your contract.
Please contact us if you have any .