Error: "Email Error: 421..." appears when I send emails in Microsoft Outlook or Windows Mail with a Norton product installed

These steps are for the current version of the Norton products. If you have an older version or if you do not know your product version, go to Norton Update Center.

Disable outgoing email scan

    When you disable the outgoing email scan, your outgoing emails are no longer scanned. However, Email Protection continues to protect your computer by scanning the incoming emails.

  1. Start your Norton product.

  2. Click Settings.

  3. Under Detailed Settings, click Antivirus.

  4. On the Scans and Risks tab, next to Email Antivirus Scan, click Configure.

  5. In the Email Antivirus Scan window, under What to scan, uncheck Scan outgoing email messages.

  6. Click Apply.

  7. In the Security Request window, from the drop-down menu, select Permanently, and then click OK.

  8. In the Email Antivirus Scan window, click OK.

  9. Click Close.

Thank you!

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DOCID: kb20101015110602EN_EndUserProfile_en_us
Operating System: Windows
Last modified: 10/03/2016