Send & Receive Issues

How to Fix Outlook Cannot Send Emails to Yahoo or Gmail

Maira Mehtab Oct 21, 2026 868 views

Question details

The user is unable to send outgoing emails to Yahoo or Gmail addresses using Outlook, although incoming mail is received without issue.

Fix Outlook Cannot Send Emails to Yahoo or Gmail Recipients

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Sending outgoing emails to external providers like Yahoo and Gmail from the Outlook client.
Observed behavior: Outgoing messages fail to deliver to Yahoo and Gmail recipients, often generating a nondelivery report, while the inbox continues to receive incoming emails normally.

Before you start

Ensure you have an active internet connection and check if you received a specific non-delivery report (NDR) in your inbox, as the error code inside will help identify the exact cause.

Solution 1Recommended

Test Sending from Outlook on the Web

This helps isolate whether the issue is with the Outlook desktop application itself or your email account's server settings.

If an email fails to send from the desktop app but works on the web, the app needs repair. If it fails on the web as well, the issue lies with your email server, DNS records, or domain reputation.

Log into webmail

Open your web browser and navigate to outlook.live.com, or your specific email provider's webmail portal.

Sign in to your account

Enter your email address and password to log in to your mailbox.

Send a test email

Click 'New message', compose a brief test email, and send it to a Yahoo or Gmail address.

Check the result

Wait a few minutes to see if the email is delivered successfully or if you receive a bounce-back message.

Webmail Failure: If you cannot send emails from the webmail interface either, you will need to contact your IT administrator or email provider to check server connectivity and policies.

Solution 2

Run an Online Repair for Microsoft Office

Use this solution if you successfully sent emails via webmail, meaning the problem is isolated to a corrupted Outlook desktop application.

Solution 3

Review Nondelivery Report and Contact Your Administrator

Addresses backend server issues, such as missing DNS records (SPF, DKIM, DMARC), which are required by Yahoo and Gmail's strict sender policies.

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Frequently Asked Questions

Why are my emails to Gmail and Yahoo bouncing back with an error?

Gmail and Yahoo enforce strict email security policies to prevent spam. If your email server lacks proper domain authentication records like SPF, DKIM, or DMARC, or if your sending IP address has a poor reputation, they will automatically reject your messages.

Will reinstalling Outlook fix my inability to send emails to specific domains?

Reinstalling or repairing Outlook will only resolve the issue if the desktop application itself is corrupted. If you test sending from your provider's webmail and it also fails, the issue is on the server side, meaning reinstalling the application will not fix it.

What is a Nondelivery Report (NDR) and how do I use it?

An NDR is an automated bounce message you receive when an email fails to reach its recipient. It contains an SMTP error code that explains exactly why Yahoo or Gmail rejected the message. You should provide this code to your IT administrator to help them troubleshoot your domain's sending reputation.

Outlook & Email Problems