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Error Number 0X800CCC0E

Getting Error while sending mail form outlook

The connection to the server has failed. 
Account: '', 
Server: '', 
Protocol: SMTP, 
Port: 25, 
Secure(SSL): No, 
Socket Error: 10060, Error Number: 0x800CCC0E

This is because the customer not able to connect to port 25 of mail server.


  • Server May be Down
  • Mail Server May be Down
  • Firewall Blocking Port 25

To Verify SMTP server working, run

telnet 25

If connected SMTP server is working.

Since windows firewall do not Block IP by itself, mostly, it can be server down or customer internet problem.

About Annie

I've been working in Technical Section for over 10 years in a wide range of tech jobs from Tech Support to Software Testing. I started writing blog for my future reference and useful for all.
Posted in Windows