Error Message while sending emails from Outlook

Sending reported error 0x80042109 Outlook cannot connect to your outgoing SMTP email server. The Outlook error 0x80042109 typically means that Outlook is unable to connect to your outgoing (SMTP) email server. This can be caused by a variety of reasons. Here’s how you can troubleshoot and fix it:

Common Causes

1. 1. 1. 1. Incorrect SMTP server settings
         2. Port 25 or 465 or 587 blocked by your ISP or firewall
         3. Antivirus or firewall interference
         4. Corrupted Outlook profile
         5. Network connectivity issues

Fixes to Try

1. Check SMTP Settings

• Go to: File > Account Settings > Account Settings > select your account > Change > More Settings > Outgoing Server and Advanced tabs.

• Ensure the SMTP server is correct (e.g., mail.yourdomain.com)

• Port is set to either 587 (with TLS) or 465 (with SSL)

• Authentication is enabled for outgoing server

2. Temporarily Disable Antivirus/Firewall

• Antivirus programs (like McAfee, Norton, Avast, etc.)  or a hardware Firewall on your network/router,  could be blocking outgoing SMTP connections.

• Try disabling them briefly to see if that resolves the issue.

3. Try a Different Port

• Port 25 (plain text authentication) is often blocked by ISPs; use 587 with TLS/STARTTLS or 465 with SSL.

4. Check Internet Connection

• Ensure you are connected to the internet and can browse the web.

5. Test with Webmail

• Log into your email via WebMail to confirm the account's password is accurate & server is not blocking your IP address. If you'r IP is blocked proceed to Step 8

6. Repair Outlook

• Go to: Control Panel > Programs and Features > select Microsoft Office > click Change > choose Repair.
   More reading: Repair Outlook Email storage file.

7. Create a New Outlook Profile

• Go to Control Panel > Mail > Show Profiles > Add a new profile and configure your account again.
   More reading: Create a Outlook profile

8. Your IP address could blocked on server's firewall (multiple failed login authentication attempts)

. Please login to customerportal and unBlock your public IP address

Should the error still persist, you can contact technical support and provide Teamviewer QuickSupport (free download from http://www.teamviewer.com/en/download/windows.aspx ) access to your PC for further investigation.