Email messages not sent through custom SMTP config #415

New Issue

MrUnknownDE · 2026-04-05T16:19:39+02:00

MrUnknownDE commented

2026-04-05 16:19:39 +02:00

Originally created by @cjanz4711 on 7/23/2025

Please help us understand how this happened and how this can be prevented from occurring in the future.

Describe the bug
Emails sent are delivered in a mixed bag between our custom SMTP integration and oneuptime alerting, causing those customers who received email delivery from alerts@oneuptime.com to complain to our support analysts and mark messages as spam.

Over 190 emails in the last 24 hours were delivered through the wrong smtp integration. This must not occur.

To Reproduce
Steps to reproduce the behavior:
Logs of the event were captured from the email logs (sent at Jul 22, 2025 at 18:00 EDT.)

Expected behavior
All emails must be delivered via the custom SMTP server.

Screenshots

Deployment Type
SaaS at oneuptime.com

Additional context
One announcement with multiple status pages delivered emails in a mixed method between our custom smtp server "Syniti via Sendgrid" and OneUptime Mail Server."

The custom smtp server is configured at the project level. No status pages have custom smtp configurations. This has never occurred in the past to the best of our knowledge.

*Originally created by @cjanz4711 on 7/23/2025* Please help us understand how this happened and how this can be prevented from occurring in the future. **Describe the bug** Emails sent are delivered in a mixed bag between our custom SMTP integration and oneuptime alerting, causing those customers who received email delivery from alerts@oneuptime.com to complain to our support analysts and mark messages as spam. Over 190 emails in the last 24 hours were delivered through the wrong smtp integration. This must not occur. **To Reproduce** Steps to reproduce the behavior: Logs of the event were captured from the email logs (sent at Jul 22, 2025 at 18:00 EDT.) **Expected behavior** All emails must be delivered via the custom SMTP server. **Screenshots** <img width="1024" height="537" alt="Image" src="https://github.com/user-attachments/assets/e46fbb62-fa2c-4c47-9064-30f1843c4c04" /> **Deployment Type** SaaS at oneuptime.com **Additional context** One announcement with multiple status pages delivered emails in a mixed method between our custom smtp server "Syniti via Sendgrid" and OneUptime Mail Server." The custom smtp server is configured at the project level. No status pages have custom smtp configurations. This has never occurred in the past to the best of our knowledge.

MrUnknownDE closed this issue

2026-04-05 16:19:39 +02:00

MrUnknownDE added the bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug labels 2026-04-05 16:19:40 +02:00

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Reference: github/oneuptime#415