Microsoft Outlook Error 0x80042109 is a common error which usually pop up when Outlook cannot connect to your Outgoing(SMTP) email server. This error prevents your mail to move outside and Outlook screen produces a send / receive error as shown in below screen.
Sending and Receiving' reported error (0x80042109) clearly specifies that Outlook is unable to connect to your outgoing SMTP mail server. Simple Mail Transfer Protocols are main elements behind Outgoing emails. If someone specify wrong details to these SMTP protocol then such kind of error 0x80042109 occur in Microsoft Outlook.
Sometimes Microsoft Outlook Error 0x80042109 occurs if there are scanning programs. And these scanning program running in background. Hence you should make sure about scanning program like Antivirus and firewall and disable it.
Default assigned value of SMTP for Outlook is 25 but after alteration in this value you need to reset it by 587. With the help of Internet Service Provider, users can troubleshoot this issue. To fix this send/ receive error you can simply change SMTP details.
How to Fix Outlook Error 0x80042109
Open Microsoft Outlook and hit the "File" button.
Hit the "Data File Management" tab.
A new "Account Settings" screen will appear.
Note: If you are using Outlook 2010 & 2013 then follow the given path :
File >> Options >> Account Settings >> Account Settings
Hit the "Email" tab and pic out the email address which is causing the error.
Choose an email address, make a double click on it.
Press the "More Settings" button.
Go to "Advanced" tab.
Change the SMTP value: "25" to "587" and select the “TLS” in “Use the following type of encrypted connection” section
Note: Blog describes different procedure to fix Microsoft Outlook Error 0x80042109 error and manual procedure is suggested to fix send/receive error of Microsoft Outlook. Sometimes this type of error occurs if there exist corruption issues in OST file. To fix error detected in Outlook OST file and repair corruption issues in OST file you need to repair it using OST Recovery Software.