On September 15th at 13:32 UTC, Pantheon declared an incident due to sporadic reports of outbound email instability. Subsequent investigation revealed performance degradation due to an unusually high volume of email traffic creating a load on the system. After applying performance tuning and restarting related services, normal operations resumed. The system was declared stable at 16:26 UTC and has remained stable since the performance improvements were instituted.
Impact: Between September 14th at 22:03 UTC and September 15th at 16:26 UTC, outbound email messages sent via SMTP experienced delays or were dropped. Pantheon was able to resend delayed emails and emails sent via an API connection were unaffected.
We apologize for any disruption this may have caused to your operations.