Why aren't emails coming from the php contact form?

Question

PHP

There is a first landing, from which letters come to the mail from a feedback form written in php - everything is OK!
On the second landing page, the form is exactly the same, the same html, the same php script - everything is exactly the same, but the messages do not come to the mail and that's it. Not in spam either, nowhere, although the script works!

The hosting of the sites is the same, everywhere there is php.

Answer 1

try to check the PHP configuration for mail and debugging in the logs, and the availability of some mail from the problematic site, most likely sending mail can be blocked by the server administrator so as not to send spam, for example