Lettermint experienced a minor incident on June 23, 2026, lasting —. The incident has been resolved; the full update timeline is below.
Update timeline
- identified Jun 23, 2026, 08:39 AM UTC
Status: Identified 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.
- monitoring Jun 23, 2026, 08:40 AM UTC
Status: Monitoring We are still actively working on this issue. An update from Spamhaus was received ~20 minutes ago and delisting is being propagated worldwide. We will keep monitoring the situation. Our sincere apologies for the inconvenience.
- resolved Jun 23, 2026, 04:24 PM UTC
Status: Resolved We are not seeing anymore deferrals related to ratelimit for these IPs and will mark it as resolved. Apologies for the inconvenience this has caused.