[Druid] Mail delivery failed: returning message to sender

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: ailg@briggsirrigation.co.uk host briggsirrigation-co-uk.mail.protection.outlook.com [104.47.20.36] SMTP error from remote mail server after pipelined end of data: 550 5.4.1 All recipient addresses rejected : Access denied. AS(201806271)