Undelivered Mail Returned to Sender
This is the Postfix program at host email.orsk-adm.ru.
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 Postfix program
<firstname.lastname@example.org>: host web.orsk-adm.ru[18.104.22.168] said: 554 Mail for
[email]email@example.com[/email] rejected for policy reasons. (in reply to RCPT TO