How to Solve Outlook Error 0x800ccc78 Unable Send Message?

Suppose you switched on your PC to work on MS Outlook. Promptly after opening MS Outlook, you clicked on Send/Receive button to send or receive some necessary mails which you were expecting from your client. But due to some annoying issue you start receiving an error messages like:

Access denied
Sending and receiving disclose error 0x800ccc78
Unable to send the message
Please verify e-mail address in account properties
Message not sent because it rejected you as sender
Server response '550', Access Denied 0x800CCC78

Here are the Common cause lists of Outlook error 0x800CCC78:

These errors mainly occur when you improperly shut down or close Outlook.
While your PST file is infected with Virus while sending or receiving email information.
When your PST file has been saved in a hard drive that has bad sectors then Outlook is likely to get corrupted and it display error 0x800ccc78

Outlook errors also caused due to the unnecessary changes in registry of your machine. If this error shows repeatedly at your Outlook screen and you don't understand why Outlook shows these error messages and how to get rid of these errors then follow the given steps:

Step 1: Open Microsoft Outlook.

Step 2: Click on "Account settings" option from "Tools" menu.

Resolve Outlook error 0x800CCC78: Step1

Step 3: You should see "Email accounts" that you are using for this Outlook and "Double click" on it.

Resolve Outlook error 0x800CCC78: Step2

Step 4: New window will pop up in your screen- Change Email Account and Fill all the required information.

Resolve Outlook error 0x800CCC78: Step3

Step 5: Click to "More settings" option and after move to "Outgoing server" tab.

Resolve Outlook error 0x800CCC78: Step4

Step 6: Choose this option- "My Outgoing Server (SMTP) requires authentication".

Resolve Outlook error 0x800CCC78: Step5

Step 7: Click on "Ok" button to finish this process.

Note: If after trying the manual method still you get an error message 0x800CCC78 on your system then there is no other way rather than going to an third party utility like PST email Recovery. As it helps in fixing all types of errors and recovering corrupt Outlook data file (.pst) in healthy file format.