Many users encounter the Outlook error code 0x800ccc78 when they try to connect to Microsoft Outlook or while using it. In some situations, the users come across the “unknown error” tag. In such cases, it might be impossible to diagnose the problem. In some other scenarios, users face the following error message while using Outlook:
Sending reported error (0x800ccc78): Unable to send the message. Please verify the email address…
As you can conclude from the above message, the Outlook error 0x800ccc78 is usually associated with the outgoing email messages. You might not face any issues with the incoming ones.
Reasons behind Outlook error 0x800ccc78:
Although there might be various reasons for the occurrence of the error 0x800ccc78, a couple of the common ones are explained below:
Step : 1 The problem might have started with your ISP (Internet Service Provider). Your ISP is responsible for sending or receiving emails because they define the port values. For sending out email messages, the default port number has to be 25. But if your ISP blocks port number 25 and enables 587, the error 0x800ccc78 pops up.
Step : 2 The issue might arise when the My outgoing server (SMTP) requires authentication option is disabled. Therefore, you have to make sure that you enable this option.
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