Letterhead Status

All Systems Operational

Uptime over the past 90 days. View historical uptime.

API Operational

90 days ago

100.0 % uptime

Today

Curations API Operational

90 days ago

100.0 % uptime

Today

Marketing API Operational

90 days ago

100.0 % uptime

Today

Applications Operational

90 days ago

100.0 % uptime

Today

Archives Operational

90 days ago

100.0 % uptime

Today

Audience Operational

90 days ago

100.0 % uptime

Today

Composer Operational

90 days ago

100.0 % uptime

Today

Dashboards Operational

90 days ago

100.0 % uptime

Today

Newsletters Operational

90 days ago

100.0 % uptime

Today

Promotions Operational

90 days ago

100.0 % uptime

Today

Delivery Operational

90 days ago

99.99 % uptime

Today

Outbound Email Deliverability (Shared Pools) Operational

90 days ago

99.99 % uptime

Today

Outbound Email Deliverability (Dedicated Pools) Operational

90 days ago

100.0 % uptime

Today

Services Operational

90 days ago

99.99 % uptime

Today

Authorization Operational

90 days ago

100.0 % uptime

Today

Automation Operational

90 days ago

100.0 % uptime

Today

Curation Operational

90 days ago

100.0 % uptime

Today

Documentation Operational

90 days ago

100.0 % uptime

Today

Email Service Provider Operational

90 days ago

99.99 % uptime

Today

Metrics Operational

90 days ago

100.0 % uptime

Today

Notifications Operational

90 days ago

100.0 % uptime

Today

Transactional Emails Operational

90 days ago

100.0 % uptime

Today

Webhooks Operational

90 days ago

100.0 % uptime

Today

Operational

Degraded Performance

Partial Outage

Major Outage

Maintenance

Past Incidents

Mar 13, 2026

No incidents reported today.

Mar 12, 2026

No incidents reported.

Mar 11, 2026

No incidents reported.

Mar 10, 2026

No incidents reported.

Mar 9, 2026

Elevated Preview-Generating Failure Rates

Resolved - This incident has been resolved.
Mar 9, 14:09 EDT

Update - We are continuing to monitor for any further issues.
Mar 9, 13:40 EDT

Monitoring - A fix has been implemented and we are monitoring the results.
Mar 9, 12:55 EDT

Investigating - The failure rate has improved, but we're still seeing new instances. Thanks for your patience.
Mar 9, 12:23 EDT

Update - We are continuing to monitor for any further issues.
Mar 9, 11:44 EDT

Monitoring - A patch is in the wild, and we are keeping our eyes peeled.
Mar 9, 11:36 EDT

Identified - We have identified the underlying issue and applying a patch. Ostensibly, there is an issue certain kinds of image handling in our newsletter composer.
Mar 9, 11:18 EDT

Investigating - We are noticing an elevated number of preview-generation failures, and we are investigating.
Mar 9, 11:05 EDT

Mar 8, 2026

No incidents reported.

Mar 7, 2026

No incidents reported.

Mar 6, 2026

No incidents reported.

Mar 5, 2026

Isolated Preview-Generation Error Related to Background Color Block Setting

Resolved - This incident has been resolved.
Mar 5, 17:39 EST

Monitoring - All looks well. We'll watch for a bit.
Mar 5, 17:38 EST

Identified - We are seeing a small but consistent-enough amount of errors where previews are failing for global templates. We've narrowed the issue down to odd background color settings, and we are looking into it. This affects < 1% of newsletters.
Mar 5, 16:41 EST

Monitoring Isolated Newsletter Publication Status Error

Resolved - All's well.
Mar 5, 09:18 EST

Monitoring - We have observed a couple of odd errors in which the newsletter status failed to change to "puiblished" after being sent. There's no indication of this being a widespread issue, but we're proactively monitoring.
Mar 5, 08:28 EST

Mar 4, 2026

Isolated Tenant Upstream Connectivity Issue

Resolved - This incident has been resolved.
Mar 4, 14:27 EST

Monitoring - Everything's looking copacetic. We will monitor for awhile longer. Sorry for the fright.
Mar 4, 14:14 EST

Update - Confirming that this is affecting the affected tenant's user interface, but neither delivery nor archives
Mar 4, 13:50 EST

Investigating - We are investigating an issue causing requests for a single tenant to return upstream availability errors (“no healthy upstream”). All other tenants remain unaffected. Engineers are actively working on resolution.
Mar 4, 13:47 EST

Mar 3, 2026

Elevated Curation Error Rates

Resolved - This incident has been resolved.
Mar 3, 14:45 EST

Monitoring - Okie dokie. It looks like all things are back to normal. We'll keep monitoring.
Mar 3, 14:20 EST

Update - Just confirming that this may cause issues when previewing newsletter templates using curation blocks. A patch is deploying.
Mar 3, 14:04 EST

Identified - We've noticed a spike of errors related around curation fetching. We believe we've already identified the underlying issue.
Mar 3, 13:51 EST

Mar 2, 2026

Double-optin Email Confirmation Delivery - Elevated Misconfiguration Rates

Resolved - This incident has been resolved.
Mar 2, 14:37 EST

Monitoring - We addressed the underlying issue and we're keeping our eye on it.
Mar 2, 12:45 EST

Update - We are continuing to work on a fix for this issue.
Mar 2, 12:06 EST

Identified - We're seeing an elevated rate of errors related to domain misconfiguration as it relates to double-optin email confirmations.
Mar 2, 12:04 EST

Mar 1, 2026

No incidents reported.

Feb 28, 2026

No incidents reported.

Feb 27, 2026

Audience Dashboard Visibility

Resolved - This incident has been resolved.
Feb 27, 14:56 EST

Identified - The issue has been identified and a fix is being implemented.
Feb 27, 13:27 EST

Investigating - We’re currently investigating reports of unexpected behavior across parts of the Letterhead application. Some users may experience issues with data visibility or functionality in certain areas of the app.
Feb 27, 12:26 EST

Microsoft-hosted Email Addresses Bouncing

Resolved - Microsoft has confirmed that they made additional changes the night of Thursday, Feb 26th that should have remediated most IP rate limiting and rejection issues. If you are still seeing impacts, please reach out via your normal support channels and our team can investigate and escalate with Microsoft.
Feb 27, 13:25 EST

Update - We are continuing to monitor for any further issues.
Feb 26, 14:26 EST

Monitoring - Microsoft is reporting elevated temporary rejection rates for emails delivered to Outlook.com, Hotmail, and other Microsoft-hosted addresses. They are actively investigating. This is an industry-wide issue and not isolated to a specific service or sender. We will continue to monitor and update this page as we receive more information.
Feb 26, 14:25 EST