Check if Substack Email delivery is down, recent outages, user-reported issues, and outages map.
Substack Email delivery is working normally
Last checked from Substack's status page a few minutes ago
This chart displays the number of user-reported issues over the past 24 hours, grouped into 20-minute intervals. It's normal to see occasional reports, which may be due to individual user issues rather than a broader problem. We only consider an issue widespread if there are multiple reports within a short timeframe.
IsDown has tracked 28 incidents for Substack Email delivery since started monitoring Substack status in April 2020. We collect data from 4484+ services, and normalize the data to give you a clear picture of the impact of the outage.
| Date | Status | Incident | Duration |
|---|---|---|---|
|
Sep 20, 2025
04:42 PM CEST
|
Minor | Post email delivery is delayed | about 2 hours |
|
Sep 15, 2025
05:24 PM CEST
|
Minor | Substack experiencing increased latency | about 4 hours |
|
Aug 30, 2025
06:17 PM CEST
|
Minor | Delay in sending scheduled posts | 27 minutes |
|
Jun 23, 2025
07:45 PM CEST
|
Minor | Substack Availability Issue | about 12 hours |
|
May 24, 2025
04:47 PM CEST
|
Minor | Substack is experiencing issues | about 13 hours |
|
Apr 29, 2025
07:03 PM CEST
|
Major | Increased error rates | about 2 hours |
|
Mar 11, 2025
05:43 PM CET
|
Minor | Email delivery delays | about 1 hour |
|
Dec 13, 2024
05:21 PM CET
|
Major | Elevated Error Rates | about 1 hour |
|
Oct 01, 2024
04:04 PM CEST
|
Major | Posts not being delivered via email | about 1 hour |
|
Mar 12, 2024
05:25 PM CET
|
Minor | Substack availability issues | about 2 hours |
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Services commonly monitored together with Substack
Substack Email delivery isn't down. You can check Substack Email delivery status and incident details on the top of the page. IsDown continuously monitors Substack Email delivery official status page every few minutes. In the last 24 hours, there were 0 outages reported.
Substack Email delivery is currently operational. You can check Substack Email delivery status and incident details on the top of the page. The status is updated in almost real-time, and you can see the latest outages and issues affecting customers.
No, there is no ongoing official outage. Check on the top of the page if there are any reported problems by other users.
Currently there's no report of Substack Email delivery being slow. Check on the top of the page if there are any reported problems by other users.
IsDown monitors the Substack Email delivery official status page every few minutes. We also get reports from users like you. If there are enough reports about an outage, we'll show it on the top of the page.
Substack Email delivery last outage was on September 20, 2025 with the title "Post email delivery is delayed"
A Status Page Aggregator centralizes the status updates from multiple service providers into one dashboard, allowing you to monitor and receive alerts about outages or issues from all your critical services in one place.
The Status Aggregator brings you the convenience of monitoring all your critical services in one place, eliminating the need to check the status on multiple websites. It ensures timely alerts on service disruptions, helping you quickly address issues and minimize operational impacts.
IsDown and DownDetector help users determine if a service is having problems. The big difference is that IsDown is a status page aggregator. IsDown monitors a service's official status page to give our customers a more reliable source of information. The integration allows us to provide more details about the outage, like incident title, description, updates, and the parts of the affected service. Additionally, users can create internal status pages and set up notifications for all their third-party services.
IsDown offers an easy way to monitor Substack with maximum flexibility
IsDown monitors Email delivery for major outages. A major outage is when Email delivery experiences a critical issue that severely affects one or more services/regions. When Substack marks an incident as a major outage, IsDown updates its internal status, the customer status page and dashboard. Depending on the customer settings, IsDown will also send notifications.
IsDown monitors Substack status page for minor outages. A minor outage is when Email delivery experiences a small issue affecting a small percentage of its customer's applications. An example is the performance degradation of an application. When a minor outage occurs, IsDown updates its internal status and shares that information on the customer status page. Depending on the customer settings, IsDown will also send notifications.
IsDown collects all information from the outages published in Substack status page to provide the most accurate information. If available, we gather the title, description, time of the outage, status, and outage updates. Another important piece of information is the affected services/regions which we use to filter the notifications that impact your business.
Substack publishes scheduled maintenance events on their status page. IsDown collects all the information for each event and creates a feed that people can follow to ensure they are not surprised by unexpected downtime or problems. We also send the feed in our weekly report, alerting the next maintenances that will take place.
IsDown monitors Substack and all their 5 components that can be affected by an outage. IsDown allows you to filter the notifications and status page alerts based on the components you care about. For example, you can choose which components or regions affect your business and filter out all other outages. This way you avoid alert fatigue in your team.
Substack and other vendors don't always report outages on time. Our crowdsourced status platform helps you stay ahead of outages. Users report issues and outages, sharing details on what problems they are facing. We use that info to provide early signs of outages. This way, even without an official update, you can stay ahead of possible problems.
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