SMTP Mailbox: Security Tab

Note: This tab applies only to SMTPs hosts.
Security Mode
Possible values:
  • None - For non-secure transfers, and commands and data are clear-text.
  • SSL Implicit - For servers that support only SSL connections.
  • SSL STARTTLS - For servers that support SSL by using either the SSL STARTTLS or AUTH TLS command. 
Client Certificate
If you select SSL STARTTLS or SSL Implicit in the SMPTs FTP tab, the target server can issue client certificates.  In this case, import the client certificate (see Certificate management) and then use the Certificate Alias and Password fields to specify or browse for the imported certificate.