We have received several mentions of mails that are not being sent by our mail relays. Our NOC team is currently investigating the issue. Mails are not lost and will be sent when the issue has been resolved.
Update: The issue seems to be impacting incoming mails as well.
Update 10:15: The issue has been resolved. The mails are being delivered again.
Update 14 apr: There has been a regression, our team is currently fixing the problem.
Update 16:57: All systems are stable. No more slowdowns have been detected.
The edpnet team
*All times are listed in CET, Central European Time