I have checked the security of my email using an external tool. The tool concluded that Zoho's mailservers support RC4-SHA encryption, which are considered 'insecure' by the external tool.

However, Zoho's security policy page states that:

1. All data transmission to Zoho services are encrypted using TLS 1.2 protocols, and we use certificates issued by SHA 256 based CA ensuring that our users have a secure connection from their browsers to our service. We use the latest and strong ciphers like AES_CBC/AES_GCM 256 bit/128 bit keys for encryption, SHA2 for message authentication and ECDHE_RSA as the key exchange mechanism.
   

Does this imply that mailservers are able to use the ciphers that are considered 'insecure' by the external tool, instead of using the 'AES_CBC/AES_GCM 256 bit/128 bit keys'?