Outage in Lettermint
[Blocklist] Broadcast IP blocked with Outlook OLC
Resolved Minor
August 11, 2026 - Started 13 days ago
- Lasted 1 day
Incident Report
We’ve identified that one of our outbound broadcast IP addresses have been blocklisted, affecting email delivery for some customers. The team is currently investigating the cause and working on delisting the IP. In the meantime, the IP address has been suspended and will not be used until the issue is resolved. This does not affect other IPs in the pool nor transactional routes.
If you have seen a hard bounce because of this, you can safely reactivate the recipient from your suppression management.
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Latest Updates ( sorted recent to last )
IDENTIFIED
12 days ago - at 08/11/2026 08:24AM
We have identified the source of the listing and are actively remediating the issue.
We will keep monitoring the situation.
Our sincere apologies for the inconvenience.
INVESTIGATING
13 days ago - at 08/11/2026 08:03AM
We’ve identified that one of our outbound broadcast IP addresses have been blocklisted, affecting email delivery for some customers. The team is currently investigating the cause and working on delisting the IP. In the meantime, the IP address has been suspended and will not be used until the issue is resolved. This does not affect other IPs in the pool nor transactional routes.
If you have seen a hard bounce because of this, you can safely reactivate the recipient from your suppression management.
Latest Lettermint outages
Intermittent Timeouts Retrieving Inbound Emails and Attachments - about 1 month ago
Increased error rates on the dashboard and Team API - about 2 months ago
[Ratelimit] Delayed sending to Outlook OLC - 2 months ago
[Blocklist] Transactional IP listed in Spamhaus - 2 months ago
[Blocklist] Transactional IP is listed in Spamhaus - 2 months ago
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