![]() If the mail size has exceeded the configured quota, you may encounter the error code 503 in Outlook. Delete old mail to free space in the mailbox. If the test fails again, move to the next solution. If the test is successful, click the Next and Finish buttons.įinally, open MS Outlook and try to send an email. To test your settings, click the Test Account Settings button. Click on the Advance tab and make sure you have configured the correct SMTP server port and the encryption protocol. Use same settings as my incoming mail server.Ħ.My outgoing server(SMTP) requires authentication. ![]() Go to the Outgoing Server tab and check the following checkboxes: Set the view to Small icons, select Mail (Microsoft Outlook), and click on the Email Accounts button.ĥ. Press Windows + R key to open the Run dialog box, type Control Panel, and hit Enter.Ģ. In that case, we need to configure the protocol from Control Panel manually. If SMTP is not configured correctly on your computer, you may encounter the 503 error. SMTP protocol plays an important role in sending mail and requires authentication for every user who wants to send emails to save them from spoofing, phishing, and spam. Tip: Read our guide on How to Disable Windows Defender for better understanding. Then, click Turn Windows firewall on or off and choose Turn off Windows Firewall (not recommended) from Private/Public network settings. To disable the Windows firewall on Windows 11, go to Control Panel > System and Security > Windows Firewall. If you can send mail after disabling the firewall, make sure to allow Outlook through the Firewall. ![]() To check if this is the issue, temporarily disable the Windows Defender firewall. However, it can sometimes interfere with Outlook and prevent sending emails. Windows 11 comes with a Windows Defender Firewall that monitors incoming and outgoing traffic to protect users’ computers from hackers. Turn off the Windows Defender firewall Temporarily
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