The plugin allows you to send email messages via the mailopost.ru provider API. So that the letters arrive quickly and do not end up in the spam folder.
When activated, in the "E-mail Settings" section, the "Mailopost Settings" tab appears, in which you need to specify the API key.
After saving the key, all letters will attempt to be sent via the service. If the service does not work and the letter is not sent via it, the standard sending from the server will work.