If you recently added an email account in your Outlook Express and received an error while sending the email, that means: Sending reported error (0X800CCC78): This message cannot be sent. Check the email address in your account. Properties .. Invalid HELLO name (see RFC2821.4.1.1.1)
You may already be trying to resend the email but each time it sends the reported error 0x800ccc78 in your Outlook or Windows Live email. It doesn't matter if you closed and restarted your Outlook, it won't work. Even after you have restarted the Windows system, Outlook cannot send email and keeps showing the same error message.
You may receive emails in your Outlook Express, but outgoing emails just don't work.
So, the question arises how to fix error 0x800ccc78 on your Windows system. Well I found the solution for this. Before we proceed, let us understand why sending emails from Outlook is not allowed.
When we set up an email in Outlook Express or Windows Live email, a connection is established via SMTP, which requires authentication to send an email. The problem only affects the settings.
Note that the given steps also work in Outlook Express 2007, 2010, 2013 and 2017 to fix error code error 0X800CCC78. So let's begin.
For Outlook Express Windows 2007
1) Open your Outlook Express 2007
2) Click Tools >> Account Settings
3) Double click on the email account for which outgoing email is not working
4) Click More Settings
5 ) Now click on the Outgoing Server tab
6) Click the radio button that says My outgoing server (SMPT) requires authentication
7) And select the second nd option Use the same settings as my incoming mail server
8) Click OK and Next and then click Finish
Now press the F9 or Send/Receive key in the menu bar and the outgoing email will work.
For Outlook Express Windows 2010, 2013 and 2017
1) Open your Outlook Express
2) Click File in the top navigation and then click Information
3) Click on Account Settings and again on Account Settings from the drop-down list .
4) Now double click on the email account for which no email is sent.
5) Click More Settings
6) A pop-up window will open. Click the Outgoing Servers tab
7) Click the radio button that says My outgoing server (SMPT) requires authentication
7) Choose the same settings as for my incoming mail server
8) Finally click OK and Next and then click Finish
Now click the Send/Receive button at the top of the menu . Your Outlook will start sending emails.
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