Why is smtp not working?

Question

linux

ssmtp.conf file:
root=(mine)@mail.ru
mailhub=smtp.mail.ru:465
rewriteDomain=mail.ru
hostname=linuxuser-desktop
FromLineOverride=YES
AuthUser=(mine)@mail.ru
AuthPass=(mypassword)
UseSTARTTLS=YES

file revaliases
root:[email protected]:smtp.mail.ru:465

PHP command:
mail($adminEmail, $subject, $message);

As a result:
The site takes a long time to load and mail() just returns false

Answer 1

UseSTARTTLS=YES

Here is the joint.
Mail.ru wants a different type of encryption, SSL/TLS instead of STARTTLS.
They clearly describe this: https://help.mail.ru/mail/mailer/popsmtp