554 errors to Microsoft services

Incident Report for mailgun

Resolved

Microsoft looks to have implemented a fix and we have noticed that delivery to Microsoft domains has returned to normal.
Posted May 12, 2016 - 12:38 PDT

Monitoring

We have identified an issue with messages to Microsoft services intermittently bouncing with "554 Transaction failed". In reviewing, this looks to be an issue that is occurring on Microsoft's end and they are investigating. We will continue monitoring the situation and provide updates
Posted May 12, 2016 - 09:55 PDT