Knowledgebase:
Microsoft error 0x800CCC1A when sending/receivig emails
Posted by Chris S., Last modified by Chris S. on 30 December 2017 03:21 AM


Outlook error '0x800CCC1A' occurs when

  1. Mail server doesn't support legacy (outdated, insecure) connection encryption that your email client (Outlook) wants
    Recent SSL Encryption Bugs (like Heartbleed bug) require we discontinue outdated Encryption ciphers, protocols for your security. However your email client is not the latest stable, secure version and does-not support the latest secure Encryption ciphers, protocols! )

  2. If in your email account Settings, wrong port number for the outgoing (SMTP) server is specified
    ( Ensure if using SSL/TLS on SMTP port is set to 465 or 587
    else set SMTP port to 25 or 26 
    )


  3. If in your email account Settings, wrong port number for the incoming (POP, IMAP) server is specified
    ( Ensure if using SSL/TLS on IMAP port is set to 993  or  if using POP3 port is set to 995
    else set IMAP port to 143  or  POP port to 110 
    )

Resolution

  1. Upgrade your Microsoft Outlook to latest stable, secure version or
  2. Move to an alternate free Email Client like Thunderbird which supports the latest security protocols and
  3. Recheck Email account settings ports

Else if all above cannot be done or fail then disable SSL/TLS Encryption in your email account Settings using the following steps,

1.  Go to 'Tools'>>'Account Settings' as shown below.

Figure Two


2. When the 'E-mail Accounts' window opens up, select the email account which needs modification and click
 on 'Change' as shown below.

Figure Three



3. Then, click on 'More Settings...' as shown below.

Figure Four

    4. Click on 'Advanced' tab in the 'Internet E-mail Settings' window and uncheck 'This server requires an encrypted connection (SSL)' under 'Incoming Server'
      5. Click on 'OK'>>'Next'>>'Finish'
        6. Click on 'Close' and restart Outlook.

        Now try sending yourself a test e-mail message to make sure it works.


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