Why is mail not being sent to Prestashop?

Question

Prestashop

There is a website tabrizgroup.ru. Feedback module is connected. form on this page
tabrizgroup.ru/index.php?controller=contact
Sending mail is configured via smtp, a test message is sent and reaches the desired address.
But when I try to send a letter through the feedback form, I get an error
"An error occurred while sending the message. Please try again."
I can't understand what is the reason. Prestashop version 1.7.4.3

Answer 1

logs

Answer 2

turn on error display and see