Error Code: 0x800CCC7F
Similar Symptoms:
454 TLS not available due to temporary reason, Protocal: 25, Secure(SSL): Yes, Server Error: 454, Error Number 0x800CCC7F
Possible Cause:
Client’s Anti-Virus program does not support SSL.
Resolution:
1) Disable the scanning email feauter in your Anti-Virus
2) Disable the SSL setting in mail client