You have received a proactive case along with an email subject High BEMTA QUEUES or High MAIL QUEUES with the following detail.
Domain name :
Domain queue count :
High volume of undeliverable emails with the same error from the recipient server.
Due to the high volume of email count that cannot be delivered. We are requesting for your assistance with the investigation into your local email sever or 3rd party services.
Please review the provided mail error and header sample to verify if those emails are legitimate. If they are not legitimate, please correspond to our email and provide confirmation that the queue can be purged.
Additionally, please provide confirmation if the root cause has been addressed to prevent any recurrences.