Outlook error (0x80042109) while sending messages
Posted by Bhushan Kumar, Last modified by Bill Williams on 22 December 2015 02:32 AM

Error Message 

Sending reported error 0x80042109 Outlook cannot connect to your outgoing SMTP email


This error is caused by either

  1. SMTP Server not specified correctly - Please check you mail server name specified in the email client's settings

  2. SMTP port 25 being blocked by ISP - In Outlook (email client), in Settings change SMTP port
    from 25 to alternate port 26 or TLS port 587

  3. Your IP address being blocked on server's firewall - 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 ) access to your PC for further investigation.

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