Default TLS Prevent Domains
There are numerous internet Service Provider (ISP) domains that allow sending via a TLS connection but do not ensure the message is secured while storing, retaining or displaying email messages. Additionally, replies/forwards of secure messages from these domains are not received securely. To prevent security issues such as insecure replies to sensitive information and bounced messages, the ZixGateway appliance comes with a list of ISPs that are automatically set to prevent a TLS connection. Meaning emails sent to these domains will be delivered via the Zix Portal
The domains that are automatically included in the Domain/Host Specific Authentication & Encryption section and are set to Prevent, are:
ZixCorp recommends that the default ISPs in the list above are set to "Prevent" to avoid storing, retaining or displaying email messages insecurely.
Carlos Rios
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