Mail Failure - Too Many Recipients

From: Mail Delivery System [mailto:Mailer-Daemon@hostname.server.com] 
Sent: Friday, April 27, 2018 1:32 PM
To: test@Domain.com
Subject: Mail failure - too many recipients

A message that you sent contained more recipients than allowed on this
system. It was not delivered to any recipients.

------ This is a copy of your message, including all the headers. ------

If you received bounced back email with subject "Mail failure - too many recipients" or similar to above, that means you have exceeded the maximum recipient limit on our mail server.

We allow maximum of 300 recipients per email message, if the no of recipient you sent is more than 300, the email will be rejected by our Mail Server and bounced back to the original sender with error message similar as above.

Solutions:
- Reduce the no of mail recipients.
- Split the recipients into several emails with maximum of 300 recipient per email.

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