15-03-2021 12:45:00 PM (GMT)
We are aware of an intermittent issue whereby some users might experience a delay in sending mails to Microsoft related email domains such as Hotmail, Live and Outlook. The cause of the issue is under investigation with Microsoft but we believe it is related to rate limiting rather than the blocking of our IPs.
Latest Update (16/03/2021 09:21): Following an extended period of monitoring overnight, no further email delivery delays have been observed. The incident has been resolved.