Outlook is a huge email service supplier for people. While using it, many a time, users face Outlook Error Code 0x800ccc1a; when you send SMTP-based email, and it can arise without any warning, the firewall is blocking the outgoing and incoming messages, slow internet connection or connectivity issues, and many more. You can get your issue resolved on-time by checking your internet connection and deactivating antivirus and windows firewall. After that, you must manually add the incoming POP Server and check your router’s MTU. Finally, you must use Inbox Repair Tool to repair the Outlook OST file.