Sender address rejected: not owned by auth user

[kirillkr (Kirill)]

Summary
I can’t setup SMTP settings. I set SMTP server in Yandex, but have error

Sender address rejected: not owned by auth user

Where I can set sender email?

Steps to reproduce
Mattermost 6.0.0 (for begin I install 5.x, but upgrade to 6) installed with docker-compose.
Own domain with mail by Yandex (such as Google for own domain).
I write correct smtp-connection:server, port, ssl, user and password. If I make mistake that I get error like bad auth not correct password. But this correct.

[MrNoize]

Komrade, попробуй в настройках mattermost зайти в настройки сайта → уведомления.

После чего заполнить поля “Уведомления приходят с адреса” и “Адрес для ответа на уведомление” с тем адресом Яндекс-почты, который указал в поле “Имя пользователя SMTP:”

I hope, my answer helps to you. Just solve this problem on my case.