Subject: Mail delivery failed: returning message to sender
From: [email-masked]
To: [email-masked]
Date: Thu, 23 Apr 2020 13:57:58 +0000

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email-masked]
    mailbox is full: retry timeout exceeded