Outage in Exclaimer

Emails are getting Pending/Defer Status when sending Emails

Resolved Minor

January 23, 2026 - Started 17 days ago - Lasted 3 days
Official incident page

Incident Report

We are currently investigating an issue affecting email delivery within our Exclaimer services. Email routed through Exchange Online may be impacted due to an ongoing Microsoft incident (MO1221364).

Components affected

Exclaimer Mail Routing - Office 365 Exclaimer Mail Routing - Office 365 Exclaimer Mail Routing - Office 365 Exclaimer Mail Routing - Office 365 Exclaimer Mail Routing - Office 365 Exclaimer Mail Routing - Office 365

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Latest Updates ( sorted recent to last )

RESOLVED 13 days ago - at 01/26/2026 02:33PM

No further issues with mail flow have been identified over the weekend that were caused by this incident. If you are continuing to experience issues with your Exclaimer Subscription, please don't hesitate to reach out, and our team will be more than happy to assist.

MONITORING 17 days ago - at 01/23/2026 06:38AM

We are continuing to monitor for any further issues.

MONITORING 17 days ago - at 01/23/2026 06:32AM

We have confirmed that Microsoft has deployed a fix to address the issue and confirmed resolution for Incident (MO1221364). We are continuing to monitor the service for stability.

INVESTIGATING 17 days ago - at 01/23/2026 02:39AM

We are currently investigating an issue affecting email delivery within our Exclaimer services. Email routed through Exchange Online may be impacted due to an ongoing Microsoft incident (MO1221364).

Latest Exclaimer outages

Exclaimer Cloud Portal not loading as expected - 4 days ago

Message delivery issues - 6 days ago

UK Server-side IP appearing on Sender Score Return Path Blocklist - 6 days ago

Client-side signature Reporting Issue - 12 days ago

Some messages are marked Undeliverable 'blocked using Spamhaus' - about 1 month ago

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