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Sending Error,

spiffs4u semprini 1 Reputation point
2026-04-20T22:54:14.0066667+00:00

Sending Error: 0x800ccc0F,

The connection to the server was interrupted

Outlook | Windows | Classic Outlook for Windows | For home
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  1. Ferdinand Nanalig 29,200 Reputation points Independent Advisor
    2026-04-20T23:59:27.55+00:00

    Hi! Let me help you.

    Please follow the steps in the accepted answer in this [link](https://learn.microsoft.com/en-us/answers/questions/5521648/receiving-error-sending-reported-error-(0x800ccc0f).

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  2. Q&A Assist
    2026-04-20T22:54:26.3066667+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    Error 0x800CCC0F in classic Outlook means the connection to the mail server was interrupted. For Outlook using IMAP/POP, use these steps:

    1. Fix the app password (IMAP/POP account)
      1. Sign in to the mail provider’s webmail.
      2. Go to Account InformationSecurity and create a new app password for Outlook.
      3. Open Outlook.
      4. Select File → under Account Information choose the affected IMAP/POP account.
      5. Select Account SettingsServer Settings.
      6. In IMAP Account Settings, paste the new app password into the Password box.
      7. Select Next, then Done.
      8. Test Send/Receive.
    2. If on Windows 10, disable TLS 1.3 (only if error persists)
      1. Close Outlook.
      2. Select Start, search for Regedit, and open Registry Editor.
      3. Browse to: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols
      4. Under Protocols, check if there is a TLS 1.3 key.
      5. If TLS 1.3 exists:
        • Right‑click ProtocolsExport to save a backup of the key.
        • Delete the TLS 1.3 key and all its subkeys.
      6. Close Registry Editor.
      7. Restart Outlook; if still not syncing, restart Windows and test again.

    If the issue is with a .pst data file (for example, frequent send/receive problems across accounts), run the Inbox Repair Tool as described in the Outlook data file repair article referenced below.


    References:

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