Yii2 Advanced, What folder do emails come to?

Question

Yii

I am designing and programming a site on Yii2 Advanced using OpenServer, and I can’t find where the letters are sent, in Yii2 Basic they go to the mail folder , but in Advanced there is a common folder , in which the mail folder contains only templates for registrants (registration confirmation). Tell me how to set up such a folder, or where is the folder with letters. Thanks in advance

Answer 1

[frontend|backend]/runtime/mail

Answer 2

What does yii have to do with it? Letters go where you send them.
Or are you interested in email templates? If yes, then common/mail