Outlook Send/Receive Error

When Outlook displays a Send/Receive error, it means the application cannot successfully communicate with your mail server to download or send messages. These errors often show as error codes like 0x800CCC0E, 0x8004010F, or 0x80040119 in the Send/Receive progress window. This guide helps you identify and fix the root cause.

Step 1: Identify the Specific Error Code

Understanding the error code narrows down the problem significantly.

1. Click Send/Receive > Show Progress or press Ctrl+Shift+F9 to trigger a manual sync.
2. In the Outlook Send/Receive Progress dialog, note the exact error message and code.
3. Common error codes and their meanings:
   • 0x800CCC0E — Cannot connect to the server (network or port issue)
   • 0x800CCC0F — Connection to the server was dropped
   • 0x8004010F — Outlook data file cannot be accessed
   • 0x80040119 — Corrupted Outlook data file
   • 0x80042108 — Timeout waiting for server response
   • 0x800CCC78 — Authentication failed when sending mail
4. Once identified, proceed to the relevant step below.

Step 2: Fix Authentication and Password Issues

Errors 0x800CCC78 and repeated password prompts indicate credential problems.

1. Go to File > Account Settings > Account Settings.
2. Select your email account and click Change.
3. Re-enter your password and check Remember password.
4. For Microsoft 365 accounts, ensure Modern Authentication is enabled:
   • Open Registry Editor (Windows) and navigate to:

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity

• Verify that EnableADAL is set to 1. If not, create a DWORD value and set it to 1.

5. Clear cached credentials from Windows Credential Manager:
   • Open Control Panel > Credential Manager > Windows Credentials
   • Remove all entries containing MicrosoftOffice or outlook.office365.com
   • Restart Outlook and sign in again
6. On macOS, open Keychain Access and search for Microsoft, then delete outdated entries and restart Outlook.

Step 3: Repair the Outlook Data File

Errors 0x8004010F and 0x80040119 point to a corrupted PST or OST file.

1. Close Outlook completely.
2. Locate the Inbox Repair Tool (SCANPST.exe):
   • Microsoft 365 / Office 2019: C:\Program Files\Microsoft Office\root\Office16\SCANPST.EXE
   • Office 2016: C:\Program Files (x86)\Microsoft Office\Office16\SCANPST.EXE
3. Click Browse and navigate to your data file location:

%LOCALAPPDATA%\Microsoft\Outlook\

4. Select the .ost or .pst file and click Start.
5. If errors are found, check Make backup of scanned file before repairing and click Repair.
6. Run the repair tool up to three times, as a single pass may not resolve all issues.
7. Reopen Outlook and test Send/Receive again.

Step 4: Reconfigure Send/Receive Groups

Misconfigured Send/Receive groups can cause sync operations to fail silently.

1. Go to Send/Receive > Send/Receive Groups > Define Send/Receive Groups.
2. Select All Accounts and click Edit.
3. Verify these settings:
   • Your email account is listed and checked in the left pane
   • Include the selected account in this group is enabled
   • All folders you want synced are checked in the folder list
4. Under Setting for group “All Accounts”, ensure:
   • Schedule an automatic send/receive every is checked and set to 5 minutes
   • Both Perform an automatic send/receive when exiting options are enabled
5. Click Close and then OK.
6. Press F9 to trigger a manual Send/Receive and verify the error is resolved.

Step 5: Resolve Firewall and Antivirus Conflicts

Connection errors like 0x800CCC0E and 0x80042108 may be caused by security software blocking Outlook.

1. Temporarily disable your antivirus email scanning feature:
   • Most antivirus programs have an Email Shield or Mail Protection feature
   • Disable it temporarily and test if Send/Receive succeeds
2. Check your Windows Firewall settings:
   • Open Windows Security > Firewall & network protection > Allow an app through firewall
   • Ensure Microsoft Outlook is allowed on both Private and Public networks
3. On macOS, go to System Settings > Network > Firewall and verify Outlook is not blocked.
4. If you are behind a corporate proxy, verify these ports are open:
   • Port 443 (HTTPS) for Microsoft 365
   • Port 993 (IMAP SSL) for IMAP accounts
   • Port 587 (SMTP TLS) for outgoing mail
5. Test connectivity from the command line:

telnet outlook.office365.com 443

6. If the connection succeeds after disabling security software, add Outlook as an exception in your antivirus configuration rather than leaving protection disabled.