FX.44 Student Program: tell applicants what to do when the verify email never arrives

Some school mail servers refuse outside mail (seen: itcgalilei.edu.it, 550 5.7.1), so an applicant at such a school waits for a link that never comes and we cannot email them to explain. The notice after applying and a new "No email from us?" item beside the form on /education now say to check spam, then apply again with another address. Since FX.24 another address gets the license on the click, with no approval. The staff alert discussed with this fix was not built: no application waits for approval any more. Tested with bin/test-student-program.php and the live page; no one has yet applied after seeing the new words.