Where does yii2 store mail logs, what else to check if the mail worked, but fell off?

Question

linux

Mail worked fine, but suddenly fell off.
What can be checked?
I send like this:

Yii::$app->mailer->compose()
     ->setTo($mail)
     ->setFrom('[email protected]')
     ->setSubject($subject)
     ->setHtmlBody($text)
     ->send();

I didn’t change the code much, I couldn’t break anything.
So I want to see what's in the logs.
On the centos server, but there is a VPS with cpanel and all the configs through it, which freezes, I don’t know these panels, and the rights on the server are limited because of them.

Answer 1

In general, retreat. The problem is that hosting has a limited number of emails per day.
And so, if on topic, then you can specify filetransfer in mailer as true in the config and then letters will be written to files in the folder runtime/mailer/