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
Desktop version