Retroactive Incident - Issues with encoded Special Characters in email From headers
Aug 5, 18:00 UTCAug 5, 18:00 UTC
Duration
0m
Impact
Informational
Root cause
Not disclosed
Twilio, 90 days
554 incidents
Affected
Not listed by the vendor.
Final update
Starting on July 16th 2026, to July 31st 2026, customers may have encountered errors when sending emails via SMTP with encoded special characters in the From header. Our engineers noticed the issue and apply a fix to correct it. There is no data loss. The issue has been resolved, and all impacted services are operating normally.
Timeline
- Resolved · Aug 5, 18:00 UTC
Starting on July 16th 2026, to July 31st 2026, customers may have encountered errors when sending emails via SMTP with encoded special characters in the From header. Our engineers noticed the issue and apply a fix to correct it. There is no data loss. The issue has been resolved, and all impacted services are operating normally.
More from Twilio
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 2503:49 UTC | SMS Delivery Delays from Twilio to Claro Brazil | minor | Ongoing |
| Sep 2502:24 UTC | SMS Delivery Delays from a Subset of Twilio Short Codes to Cellularone NE Arizona United States | minor | Ongoing |
| Sep 2420:40 UTC | Event Streams Service Disruption | minor | 5h 44m |
| Sep 2417:55 UTC | SMS Delivery Receipt Delays from a Subset of Twilio Alphanumeric Sender IDs to Ooredoo Algeria | minor | Ongoing |
| Sep 2417:19 UTC | Some Transfer Calls in Elastic SIP Trunking Failing With Error Code 32204 | minor | 43m |
| Sep 2416:22 UTC | Link Branding Creation Fails with HTTP 500 Internal Server Error (Auto SSL Enabled) | minor | 2h 4m |
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.