The NDR is generated when directory-based edge blocking in Microsoft Exchange Online blocks an incoming email message because the recipient's email address is invalid. How do I fix this? If you're an email administrator in the recipient's organization, follow these steps until the issue is fixed: Check the spelling of the recipient's email address in the NDR. Determine whether the issue ...

Learn how to fix email issues for error code 5.7.515 when sending email to Outlook.com (the sending domain does not meet the required authentication level).

Omega Ring (2504.250423-1700) Hey Xbox Insiders! We are releasing a new Xbox Update Preview to the Omega ring today. Continue reading below to learn all about what's included with this update.

Get help with Outlook for Windows, the Outlook app, Outlook.com, and more. Find training videos, how-to articles, and Outlook support content

How to send automatic out-of-office replies from Outlook (depending on the type of email account you have).

If you’re experiencing network or website connectivity issues, the Hosts file may be part of the problem. This article explains what the Hosts file is, how it works, and why resetting it to the default state can resolve common connection issues. What's the Hosts file The Hosts file is a plain‑text system file used by the operating system to map human‑friendly hostnames (such as contoso ...

A phishing email is an email that appears legitimate but is actually an attempt to get your personal information or steal your money. Some deceptive emails appear to be from a safe sender but, in fact, have a "spoofed" source address to fool you. Here are some ways to deal with phishing and spoofing scams in Outlook.com. Spoof intelligence in Exchange Online Protection helps prevent phishing ...

If you're trying to add your Outlook.com account to Outlook or another mail app, you might need the POP, IMAP, or SMTP settings. You can find them below or by viewing them in your Outlook.com settings. Outlook and Outlook.com may be able to detect your account's mailbox settings automatically, but for other non-Microsoft accounts, you may need to contact your email provider for their settings.

Provides guidance for Windows Server to protect against an L1 terminal fault (LITF) attack.

Learn about AI credits and feature limits in Microsoft 365 subscriptions.