System Status
Identified - Mailprotector has noticed an increase in the amount of emails with a “Banned Sending IP” bounce from M365 within the last 12 hours. This previously was resolved on May 1st, but the issue has returned.

This is still occurring in very small volumes, but we understand any bounce from the system is a disruption in business function. Due to this, we have reopened our case with Microsoft and are attempting to re-engage them.

We would recommend having the sender send the email again since it will go through the second time. It is important to note that this is not an outbound reputation issue.

Microsoft recommends that the sender follow the delisting instructions in the NDR (bounce notification) and resend the email. Mailprotector is attempting to work the problem with Microsoft to resolve the issue permanently.

May 09, 2025 - 12:39 EDT

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We recognize the importance of being able to trust the companies which help run your business. We want to be one of the most transparent vendors you work with. Transparency keeps us honest, and drives us to our goal of 100% uptime.

We monitor the status of all Mailprotector services. If there are any interruptions in service, a note will be posted here.

If you are experiencing problems with your Mailprotector service and do not see a notice posted, please contact our service team.

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100.0 % uptime
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90 days ago
100.0 % uptime
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Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
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No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.
May 17, 2025

No incidents reported today.

May 16, 2025

No incidents reported.

May 15, 2025

No incidents reported.

May 14, 2025

No incidents reported.

May 13, 2025

No incidents reported.

May 12, 2025

No incidents reported.

May 11, 2025

No incidents reported.

May 10, 2025

No incidents reported.

May 9, 2025
May 8, 2025

No incidents reported.

May 7, 2025

No incidents reported.

May 6, 2025

No incidents reported.

May 5, 2025
Resolved - Since April 29, there have been unnoticeable bounces. While we cannot be certain that Microsoft will not repeat the issue, the status is considered resolved at this time. If you receive a bounce for "banned sending IP" or "blocked using Spamhaus", please open a support request.
May 5, 09:56 EDT
Monitoring - Since April 30, little to no bounces have been observed. We are continuing to monitor the situation and waiting for Microsoft's response to explain the reason and a permanent resolution.
May 2, 09:35 EDT
Update - Bounces over the last 7 days have subsided, but an increase has been observed today, April 29. The number of bounces is tiny; however, we know a single bounce can frustrate a customer.

Communication with Microsoft was escalated last week, and we await more information.

Apr 29, 16:21 EDT
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, 13:42 EDT
May 4, 2025

No incidents reported.

May 3, 2025

No incidents reported.