Outlook.com email account appears as "outlook_[long series of letters and numbers]@outlook.com" in Outlook for Windows

Last updated: November 16, 2016

ISSUE

After connecting to Outlook for Windows (Outlook 2016, 2013, 2010 versions) to your Outlook.com email account, your may experience the following:

  • Your email account name shows up as outlook_[long series of letters and numbers]@outlook.com in the Folder Pane and when composing emails using Outlook for Windows.

  • Recipients will also receive the email from the sender with the outlook_[long series of letters and numbers]@outlook.com format.

  • When recipients reply to the email, the email bounces and you may receive the message “Undeliverable message when you send Internet mail in Outlook.”

This issue only impacts customers using Outlook for Windows. Emails sent via Outlook.com on the web works correctly and emails will be sent with the correct email address.

WORKAROUND

This issue occurs for users with multiple account aliases. We are actively working on a fix. In the meantime, to fix this issue, please do the following:

  1. Go to https://account.live.com/names/Manage and sign in to your Outlook.com account.

  2. Set your Outlook.com email as the primary alias.

  3. In Outlook for Windows, remove and re-add the account. See the steps in this article: Add your Outlook.com account in Outlook for Windows

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See Also

Fixes or workarounds for recent issues in Outlook for Windows

Resolve Outlook for Windows issues with automated troubleshooting tools

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