Why do I getting error “Protocol: SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0B”?

You may receive this error in your email client settings at some point. In Outlook this is a bug and can usually be resolved by restarting your email client and making sure you have SMTP authentication enabled.

This is not a server problem and is caused by a miconfigured email client, ISP\'s blocking access to port 25 and using port 26 instead or a DNS problem with your ISP.

To confirm that the mail server is online and responding you can perform the following:

  1. From the 'Start' button click 'Run'
  2. Type in 'telnet yourdomain.com 25'
  3. You should receive something to the effect of:
  4. 220-server.dnsprotect.com ESMTP Exim x.xx #1 day, xx Month 2004 time
  5. 220-We do not authorize the use of this system to transport unsolicited,
  6. 220 and/or bulk e-mail.
  7. This confirms there are *no problems* with the SMTP server

To confirm the POP server is online and responding:

  1. From the 'Start' button click 'Run' Type in 'telnet yourdomain.com 110'
  2. You should receive something to the effect of:
  3. +OK POP3 [cppop x.x] at [xx.xx.xx.xx] (yourdomain.com)
  4. This confirms the POP server is online and there are no problems with the POP server.
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