Odoo can not send emails

Hi, I installed Odoo Community on my unmanaged Server.

Everything works fine. Ihave just a problem with sending and recieveing emails.
When I want to send it from my local installed Odoo, it works. But from server doesnt works

I got this error
Mail Delivery Failed
Mail delivery failed via SMTP server 'None'.
SMTPDataError: 550
5.7.1 Sender mismatch

Thanks for bidding