Please provide the form that has this problem.
I tested one of your forms. The email was accepted by your email server successfully. So, if it did not arrive on your email inbox, send this log to your email server administrator so they can check their logs and see why this email is not arriving:
May 27 01:36:18 yang sm-mta: o4R5aI2t004970: to=<firstname.lastname@example.org>, ctladdr=<email@example.com> (1003/1004), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=129067, relay=mailscanner.asc.edu. [18.104.22.168], dsn=2.0.0, stat=Sent (Ok: queued as BAC0577F81B)