Outlook 2007/2010 gives error 0x80042109 when sending emails (Solved)

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The very common problem that users of MS Outlook 2007, 2010 or even the latest versions encounter is the error 0x80042109 that shows up when sending emails. As a result, the user is just able to receive emails but not send. Isn't that frustrating?

Error 0x80042109 shows up when sending emails in MS Outlook 2007 or 2010

It is indeed frustrating to just be able to receive emails but not send them. Imagine you receive an email requiring your immediate response, like work-related tasks in a daily basis. Being unable to reply will be real nightmare.

In order to solve this sending issue, if you are using MS Outlook 2007, 2010 or later, you can follow these steps:

Step 1: Open MS Outlook and then click on File => Account Settings => Account Settings. For MS Outlook 2007, open Outlook 2007 then click on Tools => Account Settings.

Account settings in Outlook 2010

Step 2: In the dialog box that opens, locate the email account that you are using to send emails, or the email account that has problems sending emails. Click on it to select, then click on Change at the top. Alternatively, you can also double click on the problem email.

Step 3: Click on the "More Settings" button.

Step 4: Another dialog box will open. Click on the Advanced tab.

Step 5: There set the Outgoing Server (SMTP) port to 587. (The default port is 25. But because port 25 is the normal target of spammers, ISP now block port 25 and route the sending through secure port 587).

Step 6: Then set the encryption to TLS.

Step 7: Then click OK. Click Next on the other dialog box and then Finish.

Changing the SMTP Port from 25 to 587

Step 8: Now you shall be able to send emails without the annoying error message.