Email Send Error

Question

Since my last Microsoft update I cannot send email - but I can receive. On send I get error code 0x800CCC78. My email service provider determined 'no problem' with my settings. Today I tried a Microsoft 365 repair 'on-line' but the problem remains. I still have Windows 10. Any recommendations?

Answer 1

Hello Mark,

I’m an Independent Advisor and Microsoft user like you. Thanks for posting the query here at this forum.

The error 0x800ccc78 in Outlook can occur for several reasons:

1. Your Internet Service Provider (ISP) has blocked the port number and changed it to another one
2. Your outgoing server authentication settings are incorrect
3. You have exceeded your daily quota and cannot send mail for about 20.5 hours
4. "My Outgoing Server (SMTP) Requires Authentication" is unchecked

Please try below steps,

1. Close all Office applications including Outlook.
2. Sign-out of your Office account and Do a safe reboot. You can start Safe Mode using the F8 key during start up.
3. Check the account settings and change the authentication settings in Outlook as per your Internet Service Provide. Restart your Internet modem.
4. Close and reopen Outlook in Safe mode. 1. Right-click the Start button, and click Run. 2. Type Outlook.exe /safe, and click OK.

Hope this information would be useful to you. Please feel free to get back if you need any additional info.

Thank you! Ravikumar Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.

Answer 2

Brilliant - thanks so much for taking the time and sharing your expertise and insights!

Answer 3

Thank you. Please let us know if you continue to see any issue. you can reopen the thread and share the details.

Regards, Ravi