Service Alert: Microsoft Email Delivery Delays — November 12-13, 2026

Microsoft is currently experiencing a widespread outage affecting Outlook, Exchange Online, and other Microsoft 365 services. As a result, emails sent to recipients using these services may be delayed until Microsoft resolves the issue.

If your mailing list includes a significant number of Microsoft email users, you may notice temporarily lower open and click rates while deliveries are delayed.

There is no need to resend your campaign. Direct Mail will automatically retry temporarily delayed deliveries until Microsoft's servers are accepting mail again. No action is required on your part.

For updates, visit Microsoft's Service Status page or Microsoft 365 Status on X. We'll also update this notice as more information becomes available.

Help Documentation 〉Old Versions of Direct Mail 〉Campaign Reports 〉

Discovering what email clients your recipients use

This help article is for an old version of Direct Mail.

You may want to know what email clients your recipients are using in order to optimize the design of your template. For example, if most of your recipients are reading your email in Outlook on Windows, your message should not use fonts that are unavailable on Windows.

Here's how to see what the popular email clients are:

  1. Go to the Reports tab.
  2. Click on the email campaign you want to inspect.
  3. The top 5 email clients are shown in the Summary section. To view more than 5, click the downward facing arrow underneath the top 5 list.

You can also view email client information in the "Recipients" section of the campaign report as well as the "Charts > Email Clients" section.

Did you find this article helpful? Yes | No