Dear all,
Since this morning it seems that we are not able to send any messages to a certain domian. We receive such e-mail every time when we are trying to send it:
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept
email from certain senders, or another restriction may be preventing delivery.<o:p></o:p>
The following organization rejected your message: cluster-a.mailcontrol.com.
Could you please help me to resolve this problem
Thank you in advance<o:p></o:p>