Undelivered Mail Returned to Sender

Dobrý den,
obdrželi jsme tuto zprávu při pokusu odeslání mailu na oldrich.misa@drinkgas.cz

Kde je prosím problém?

Děkuji
Karel Salay

—— Přeposlaná zpráva ——
Od: „Mail Delivery System“ <MAILER-DAEMON@wes1–so1.wedos.net>
Komu: mex@mex.cz
Odesláno: 16.3.2020 11:39:41
Předmět: Undelivered Mail Returned to Sender

This is the mail system at host wes1–so1.wedos.net.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<oldrich.misa@drinkgas.cz>: host
drinkgas-cz.mail.protection.outlook.com[104.47.17.74] said: 550 5.4.1
Recipient address rejected: Access denied. AS(201806281)
[DB8EUR05FT031.eop-eur05.prod.protection.outlook.com] (in reply to RCPT TO
command)