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Post Mortem

2 posts

Post Mortem

Postmortem: The July 21 TLS Certificate Incident on api.mailchannels.net

July 22, 20265 min read

July 21, 2026 On the morning of July 21, 2026, we rotated the TLS certificate on api.mailchannels.net, the endpoint that receives every message sent through our Email API. Within minutes, …

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Post Mortem

MailChannels Service Disruption: All The Gory Details

April 26, 20249 min read

On April 22, 2024, at 05:30 UTC, our monitoring systems alerted us that SMTP connection times had spiked from the normal sub-1 second to over 7 seconds. This was the …

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