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SMTP Error 0x800CCC60

Last modified: July 2, 2022
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The SMTP server returned an error –>

Account: ‘accountname’,
Server: ‘’,
Protocol: SMTP,
Server Response: ‘rblsmtpd: pid 11559: 451 Blocklist Removal Center‘,
Port: 25, Secure(SSL): No,
Error Number: 0x800CCC60

Root Cause:

Your server is as of now under ‘OPEN RELAY’. This implies your server being utilized by spammers to convey spam messages.

How to Fix Outlook SMTP Error 0x800CCC60

Method 1 - Check Account Settings

  1. To begin, go to the Tools menu or the File tab in Outlook.
  2. Open your email and go to Account Settings.
  3. After that, double-click on the account and select More Settings.
  4. Check and double-check your email address and password.
  5. After that, make sure that authentication is enabled while sending email.
  6. Finally, double-check that the port number is right (set to 25 or 587)

Method 2 - Disable Firewall

  1. To begin, turn on the firewall that was installed on your computer.
  2. Second, go to Control Panel > Advanced settings and see if Outlook is restricted or not. If Outlook is currently blocked, it will be unblocked.

Method 3 - Check Blacklist IPS

  1. To begin, go to and look up your IP address.
  2. Then, open the firewall and look for your IP address in the blocked column.
  3. If your IP address is on the blacklist, remove it and Save the settings.
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