Form submission emails not being received

At some point yesterday afternoon, I stopped receiving submission emails from my customers use of my booking form.

The booking process runs through normally but no emails are being received.

Other direct emails are being received successfully to the same email address.

As I check the email history log, I see that the emails are being sent using SMTP and the emails seems to sent successfully. 

Please check the SMTP email credentials in your JotForm account and see if it is required to change any settings.

https://www.jotform.com/help/241-How-to-Edit-Delete-Sender-Emails-on-SMTP-Settings

Please get back to us if you need any further assistance. We will be happy to help.

Further info. I have checked the security credentials for the smtp email settings and they are correct.

Also the autoresponder emails from jotform are not being received by the customer either.

So I think the problem is with Jotform rather than the email client settings

Managed to get the autoresponder working for emails to the customer, but the notification1 emails from jotform still isn't working

Can you please try to switch to noreply@jotform.com and check if it helps?

Please also try to inspect your logs, which should show you the incoming and out outgoing traffic/requests.

Please test with noreply@jotform.com as a Sender Email and inspect the logs as mentioned above and let us know, if the issue still persists.

We will wait for your response.