Email sent to one mailbox but not another

Where can we see the website in question?

https://cliftonaudiology.com/contact/

See Setting up mail

What email settings do you have in the Mail tab panel?

To protect personal data, hiding email addresses in the settings or replacing them with dummy addresses is strongly advised. You can also include screenshots.

I’ve seen the ‘setting up mail’ page which is where I got the info from originally, but this is specifically about using certain email address seeing as it worked just fine with the first two and not the third.

Mail tab: https://snipboard.io/jCphU3.jpg

You seem to have a few configuration errors in the email templates. I suggest you fix them first.

They were referring to the email field being ‘required’ and reCAPTCHA.

Neither of which were stopping submissions from being sent to the first two addresses, so it wouldn’t make sense to still have a problem with the third.

Even after clearing those two ‘errors’, the problem still persists.

Is there anything that would stop submissions to the 2134ad21.[client’s domain][email protected] address? Before migration to WP it was on Squarespace and there was no issue at all with submissions being sent to that address, so why does this plugin have a problem with it?

Do you get any response message after you submit the form?

I see ‘Thank you for your message. It has been sent.’ but they’re adamant that they’re not receiving anything. Is that in any way possible?

See FAQ > I see a response message “Thank you for your message. It has been sent.” with green border, but I never receive a mail for that.