Inbound emails bounced from small pool of servers

Incident Report for Mailprotector

Resolved

Over the weekend, a small pool of inbound gateway servers bounced incoming emails to CloudFilter because of a database connection issue. The NDR message indicates:
The response from your-domain-com.inbound.emailservice.io was:
5.7.1 username@your-domain.com: Recipient address rejected: Access denied

The team responded and resolved the issue quickly. Fortunately, weekends have a comparatively low email volume. However, if a user was expecting an email and did not receive it, they may need to request the sender to retry sending it.

A thorough investigation of the incident is being performed, and the issue will be adjusted, monitored, and mitigated for the future.

Posted Apr 12, 2025 - 13:00 EDT