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Sender address rejected: not owned by auth user

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.