FORM not sending Messages

I am a very new Enfold user. I created a website for my customer to sell masks for Covid-19. It has two forms One is a standard “Contact Us” form (Page: Contact) and the other is an ORDER form (Page: Email Us”). The Order form is of the most concern. Sometimes it works and many times it does not. We know this because SOMETIMES when it doesn’t work, the customer, by chance, will call the vendor and say they never got the confirmation email. Also, the vendor will not get the email of the order.

I have tried my own tests from my computer and standard email. I ALWAYS get the “EMAIL HAS BEEN SENT!” message and sometimes it works and sometimes it doesn’t. When it works, it works correctly. When it doesn’t neither the vendor or I will get the test order emails.

I know my customer is losing orders because when it fails, the customer has every reason to think it worked since they get the “Sent …” message.

I have read the many posts from six months ago but the solutions suggested are way beyond my meager understanding of the technicalities.

Can you help please … I have posted my credentials in the private content. Any suggestion you can make for me to get past this problem would be greatly apprecciated.

Thank You.

Alan