System Status
Intermittent bounced emails inbound to M365 domains
Identified - Mailprotector is aware of intermittent bounces of inbound emails to Microsoft 365 domains. The bounces reference one of two reasons: "banned sending IP" or "blocked using Spamhaus."

In both cases, Microsoft and Spamhaus do not indicate that the IP addresses are blocked when a delist request is made. Mailprotector has two open and active support requests with Microsoft to explain and resolve the situation. Mailprotector has been attempting to resolve the issue with Microsoft for over a week. Unfortunately, we have seen increased bounces in the last 24 hours. Partners and users may click on the delist links in the bounce notification. However, the delist will reply that the IP addresses are not listed.

It is important to note that this is not an outbound reputation issue. Microsoft is randomly rejecting emails from IP addresses that only relay inbound emails after being filtered. The IP addresses are added to the recommended inbound connector for M365 deployments.
Apr 17, 2025 - 13:42 EDT

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Uptime over the past 90 days. View historical uptime.
Shield Operational
90 days ago
100.0 % uptime
Today
Bracket Encrypted Email ? Operational
90 days ago
100.0 % uptime
Today
CloudFilter and SafeSend Email Security ? Operational
90 days ago
100.0 % uptime
Today
Management Console ? Operational
90 days ago
100.0 % uptime
Today
XtraMail Continuity ? Operational
90 days ago
100.0 % uptime
Today
SecureStore Archiving ? Operational
90 days ago
100.0 % uptime
Today
CloudMail Hosted Email ? Operational
90 days ago
100.0 % uptime
Today
Service Announcements ? Operational
90 days ago
100.0 % uptime
Today
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

Apr 26, 2025

No incidents reported today.

Apr 25, 2025

No incidents reported.

Apr 24, 2025

No incidents reported.

Apr 23, 2025

No incidents reported.

Apr 22, 2025

No incidents reported.

Apr 21, 2025

No incidents reported.

Apr 20, 2025

No incidents reported.

Apr 19, 2025

No incidents reported.

Apr 18, 2025

No incidents reported.

Apr 17, 2025

Unresolved incident: Intermittent bounced emails inbound to M365 domains.

Apr 16, 2025

No incidents reported.

Apr 15, 2025

No incidents reported.

Apr 14, 2025

No incidents reported.

Apr 13, 2025

No incidents reported.

Apr 12, 2025
Inbound emails bounced from small pool of servers
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.
Apr 12, 13:00 EDT
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