Mailgun outage, November 2025: Elevated inbound recipient rejected
Mailgun reported and resolved an incident: Elevated inbound recipient rejected. It lasted 1 minute.
OKResolved
From Mailgun's official status page, in their words.
What happened
- Started
- Resolved
- Duration
- 1 minute
- Impact
- none
- Investigating
- Identifiednot posted
- Monitoringnot posted
- Resolved
Why it happened
Mailgun has not given a cause in its updates. We never guess one.
How it was resolved
On November 13th, Mailgun incorrectly rejected a subset of inbound emails with a 550 "recipient rejected" error. Senders received bounce notifications even though delivery should have succeeded. Affected timeframes: US region: 05:14 to 06:41 UTC and 14:55 to 15:48 UTC EU region: 14:55 to 15:48 UTC Based on our analysis, approximately 25% of US inbound traffic and 50% of EU inbound traffic had a chance to have been impacted during these windows. We're unable to provide exact counts due to gaps in our logging for rejected inbound mail, which we have since corrected.
Timeline
Oldest first, from the first notice to the resolution. From Mailgun's official status page, in their words.
- resolved
On November 13th, Mailgun incorrectly rejected a subset of inbound emails with a 550 "recipient rejected" error. Senders received bounce notifications even though delivery should have succeeded. Affected timeframes: US region: 05:14 to 06:41 UTC and 14:55 to 15:48 UTC EU region: 14:55 to 15:48 UTC Based on our analysis, approximately 25% of US inbound traffic and 50% of EU inbound traffic had a chance to have been impacted during these windows. We're unable to provide exact counts due to gaps in our logging for rejected inbound mail, which we have since corrected.
What this means for a business (and what to check now)
- Retry anything that failed during the 1 minute.
- Enter any payments, bookings or jobs you took another way.
- If a deadline fell inside the window, keep this page as your record of the outage.
The full guide: what to do when a service you rely on is down
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