Opal5 was temporarily offline after running out of disk space. The server is online at this time and we're working to make more storage available.
Additionally at the time of this incident our status page (this site) was failing save our updates. We're working to correct that.
No incidents reported
smtp.us.opalstack.com is currently on the Cloudmark blacklist which is used by Comcast and other services. We've submitted a delisting request to Cloudmark and are waiting for a followup from them.
The US SMTP is no longer blacklisted.