Let me assist you with your concern regarding being unable to send and receive emails due to error: 0x800CCC90.
Based on our investigation, the error message usually caused by the following:
1. Incorrect POP settings (usually the SSL option for SMTP) – check with provider if it is required or not
2. Firewall blocking ports (usually port 25) – could be 3rd party since Windows Firewall generally allows this port through, unless specifically told not to do so.
As our initial troubleshooting step, I recommend that you try to reconfigure your account. To do so, please visit the link below: