Outage in Lettermint

[Ratelimit] Delayed sending to Outlook OLC

Resolved Minor

June 23, 2026 - Started about 1 month ago - Lasted about 8 hours

Incident Report

We are actively mitigating this issue. You might see deferrals in your webhooks or UI instead of delayed processing. Please note emails are still being retried. This is caused by an increase in volume due to the ongoing incident with Spamhaus listing, which is being resolved and the delisting is being propagated. This issue does not impact Microsoft 365 (Outlook 365) addresses nor other providers. Broadcast is also not affected by the issue. Our sincere apologies for the inconvenience.

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Latest Updates ( sorted recent to last )

MONITORING about 1 month ago - at 06/23/2026 09:30AM

We are seeing improvements and emails are being delivered.

We will keep monitoring the situation closely.

IDENTIFIED about 1 month ago - at 06/23/2026 08:39AM

We are actively mitigating this issue. You might see deferrals in your webhooks or UI instead of delayed processing. Please note emails are still being retried.

This is caused by an increase in volume due to the ongoing incident with Spamhaus listing, which is being resolved and the delisting is being propagated.

This issue does not impact Microsoft 365 (Outlook 365) addresses nor other providers.

Broadcast is also not affected by the issue.

Our sincere apologies for the inconvenience.

Latest Lettermint outages

Intermittent Timeouts Retrieving Inbound Emails and Attachments - 10 days ago

Increased error rates on the dashboard and Team API - about 1 month ago

[Blocklist] Transactional IP listed in Spamhaus - about 1 month ago

[Blocklist] Transactional IP is listed in Spamhaus - about 1 month ago

Delayed sending to Outlook OLC - about 1 month ago

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