Outage in Substack

Issue with reported open rates

Minor

March 27, 2026 - Started 4 days ago
Official incident page

Incident Report

We’re investigating an issue affecting reported open rates for some publishers. Current evidence suggests this is related to how Gmail loads tracking pixels, and does not indicate a change in engagement or deliverability. We take responsibility for ensuring these metrics are accurate and are prioritizing improvements to our open rate tracking so this is resolved as quickly as possible. We will continue to provide updates here as we learn more.

Components affected

Substack Email delivery

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Latest Updates ( sorted recent to last )

INVESTIGATING 4 days ago - at 03/27/2026 10:20PM

We’re investigating an issue affecting reported open rates for some publishers. Current evidence suggests this is related to how Gmail loads tracking pixels, and does not indicate a change in engagement or deliverability.

We take responsibility for ensuring these metrics are accurate and are prioritizing improvements to our open rate tracking so this is resolved as quickly as possible. We will continue to provide updates here as we learn more.

Latest Substack outages

We're aware of an issue causing delays in publisher stats - about 1 month ago

Publisher Stats Loading - about 1 month ago

Substack Availability Issues - about 2 months ago

Issues loading Notes - 3 months ago

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