I can’t make SMTP work with my email provider. What’s wrong?
In case you face some issues with the popular email providers, please check whether you have allowed the usage of the third-party apps. The problem may be in the security limitation and without changing some security settings you may face the incorrect work of the SMTP extension.
The solution for Gmail can be found here. You may find the desired manual for your other email providers in their help sections or seek help via their support teams.