Problems with Contact Us Form in new Theme

Hi,
I have installed Opencart Version 4.0.2.3, i bought a new theme from Marketplace on here.
I have been setting it up but i cant get the Contact Us form to work that is built into the theme here
https://apollovsautograph.com/index.php ... uage=en-gb
The theme support told me to add my email details into the opencart mail settings which i have done here

i have added the correct password but when i try and send a message using the built in contact us form it says an email has been sent to the owner but i never recieve one but also i dont get an error?
I use and recieve emails on this account all the time so that isnt the problem, the support will no longer help me as they say it isnt their problem, but if i cant get this to work the theme is useless to me and i have wasted $70
Is there any help or advice people can give me please as i dont know much about opencart and is fairly new to me?

Any help is appreciated, cheers

Check both your PHP and OpenCart errors logs. Also check you outgoing mail server logs to see it the email reached that far. In cPanel it's call Track Delivery.

Have you tried Mail as the Mail Engine?

looks like i am getting this erorr in the logs
2024-06-15 09:59:25 - Error: EHLO not accepted from server! in /home/apollovsautograp/public_html/system/library/mail/smtp.php on line 173

The error message "EHLO not accepted from server" is caused by a badly configured SMTP server1. One possible workaround is to edit /system/library/mail.php and change the code2. Another solution is to use tls:// for the hostname and port 5873. You can also try changing the order of the commands1. Alternatively, you can try changing the port to 25 instead of 4654. Another solution is to check postfix main and comment out non_smtpd_milters5.

Could be your timeout value is too low.

You could also add $reply onto the end or the error thrown on line 173 to give you more details.

if i bought a contact us form extension do you think that would help or would i have the same issues?
This is very frustrating, have tried everything i have seen online and nothing seems to work.
I do appreciate you trying to help though

Unless the extension replaces the core OpenCart SMTP library it's unlikely it's going to help.