How to FIX: 0x800CCC78 Outlook Send-Receive error (Solved)

How to FIX: 0x800CCC78 Outlook Send-Receive error (Solved)

Here we can see, “How to FIX: 0x800CCC78 Outlook Send-Receive error (Solved)”

Continue reading below to learn how to fix the error 0x800CCC78 in the Outlook Send/Receive process. The 0x800CCC78 sending error in Outlook commonly arises when the SMTP server authentication is faulty or when the recipient address contains an invalid character.

This tutorial will show you how to fix the Outlook Sending problem 0x800CCC78:

  • The message could not be sent. In your account’s properties, double-check the email address. The server responded as follows: 5.0.0. Access has been denied, or…
  • The message could not be sent. In your account’s properties, double-check the email address. 555 5.5.4 was the response from the server. SMTPUTF8 is an unsupported option (parameter unrecognized).

The Cause of Outlook Error 0x800ccc78

This issue usually appears when something goes wrong with email authentication.

The Internet Service Provider, or ISP, receives data since it sets the port values for network synchronisation. When transferring emails from Outlook, the default port number is 25. However, the issue arises when their ISP blocks their port number and replaces it with another. Outlook error 0x800ccc78 happens when your ISP blocks port 25 and allows port 587.

Another example is when “My Outgoing Server (SMTP) Requires Authentication” is unchecked. If you don’t activate it, you won’t send or receive emails across the network.

Also See:  Printer Needs User Intervention Error

How to Fix Outlook’s Send/Receive Error 0x800CCC78

Method 1: Verify the address of the recipient.

To begin, double-check that the recipient’s email address is correct and free of any special or unfamiliar characters. Even better, try sending the email again after deleting and retyping the email address. Continue reading below if the 0x800CCC78 issue in send/receive persists.

Method 2: Modify the Connection and Authentication Settings on the SMTP Server.

1. Select Account > Account Settings from the File menu.

2. Select More Settings from the drop-down menu after double-clicking on your email account.

3. Select the Outgoing Server option from the Outgoing Server tab. My outgoing server (SMTP) requires circle-box authentication. Use the same settings as my outgoing mail server.

4. Now go to the Advanced page and type in 587 for the SMTP server’s port number and Auto or TLS encryption. When you’re finished, click OK.

Note: Change the port to 465 and the encryption to SSL if the port is already 587.

5. Finally, test the account settings and continue working if the test is successful and error-free.


I hope this information was helpful to you. If you have any questions or comments, please use the form below.

User Questions:

1. Why isn’t my outlook able to send and receive emails?

To re-authenticate, sign out of your email account and back in again. For the Mac version, click the “Send & Receive” button under the “Home” tab, and for the PC/Windows version, click “Update Folder” under the “Send/Receive” tab. Check to see if you’re “Working Offline.”

2. What is the 0x800ccc0f error in Outlook?

When sending an email from Microsoft Outlook, the error number 0x800CCC0F is created. CAUSE. The mail client (Outlook) is unable to reach the MailEnable server, resulting in this error. The most common cause is that a firewall is blocking communication between the client and the server.

3. What is the 0x80042108 problem code in Outlook?

The Outlook 0x80042108 problem commonly happens when you type the name of the POP3 email server incorrectly or when you don’t have Internet connectivity. Contact your server administrator or Internet service provider (ISP) if you continue to see this message.”

Also See:  Keahak 9 Login

4. Proton/Outlook Issue

Proton/Outlook Issue from ProtonMail

5. Office365 – Sporadic Send/Receive Error When A User Sends From a Different Mailbox

Office365 – Sporadic Send/Receive Error When A User Sends From a Different Mailbox from sysadmin