Reports - "Email Encryption Summary"

Legend

Auto Encryption - messages were encrypted according to your Encryption settings if "AutoEncryption" is enabled for sender domain
Encrypted Portal - messages were encrypted based on "Subject-Line Encryption Keywords" and delivered via Encryption Portal, because recipient does not support TLS protocol 
Encrypted Portal (TLS) - messages were encrypted based on "Subject-Line Encryption Keywords" and delivered directly to the recipient mail server using TLS protocol 
No Encryption - messages were delivered without encryption because "AutoEncryption" is not enabled for sender domain