Contact Emails Not Sending

I have tried several test emails, to a few contacts within the directory and nobody is receiving them, including me (above link is my directory entry). I have put a plugin on which shows other emails as having been successfully sent (Post SMTP) from my WordPress site but it does not log any originating from the directory.

I would prefer not to have the form than one that doesn’t work, so the only option if no solution is to remove email addresses from every directory entry, which will be time-consuming and disappointing obviously.

The page I need help with: [log in to see the link]