How do I fix error 0x800ccc78 in Outlook?

Question

Now let’s focus on the compatibility of Outlook so it may clear your mind what actually it is because it generally enables every user who has emails on Microsoft exchange. Do you think that you are able to use the server? 

Outlook Technical Error Support Phone Number 

Answer 1

Open Outlook.
From the Tools menu select Account Settings. ...
Verify that the E-mail tab is selected. ...
Click on the account to highlight it, and click on the Change icon above it. ...
Click the button More Settings... in the lower right-hand corner. ...
Click on the tab Outgoing Server.

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Answer 2

Change Port Number to 587
Step 1: Start your Outlook. Click Tools and go to Account Settings.
Step 2: Under account settings, click the change button. Go to more settings under add new email account. Click on the tab, labeled "Advanced."
Step 3: Go to the port numbers of SMTP and IMAP, set 587 as the port number for SMTP (Outgoing server). Now click, Ok. Click on Next and then the finish button.
Step 4: Close your outlook application and restart it. Try sending a message and see if it works. If the error pops up again, move to the next method.

Greetings,
Peter