Matomo no send mail for invite a new user

Hi all,

We have a new matomo installation in ver. 4.13.3, php 8.2.x with system RedHat 8.x
Manual verification of email sending using instructions: ./console core:test-email email_adres - is performed without problems. Matomo has never sent a single email from this installation.

Sending an e-mail from the new user function is successful - the service says that the e-mail has been sent, but the effect is that nothing reaches the addressee with matomo. Even nothing reaches exchange, there is nothing in the logs about problems.

Where is the problem?
Thank you for your help.