![]() However, the benefits of requiring TLS far outweigh the potential drawbacks. ![]() In these cases, your mail server will be unable to send email to these servers because the connection cannot be securely encrypted. This is because some email servers may not support TLS, or may not have it enabled. WM: But if I require TLS, won't some good email get blocked?ĬhatGPT: If you require TLS on your mail server, it is possible that some legitimate email may be blocked. This can help protect your users' privacy and prevent sensitive information from being intercepted. By requiring TLS, you can ensure that all communications between your email server and other servers are encrypted and secure. It is especially important for email servers because email is often transmitted across networks in an unencrypted form, which means that anyone who has access to the network can potentially read the email as it is being transmitted. TLS is a security protocol that provides privacy and integrity for communications over the internet. WM: Should I require TLS on my mail server?ĬhatGPT: Yes, it is a good idea to require TLS (Transport Layer Security) on your mail server. As such, turning it on seems a no-brainer. It also claims that Gmail requires TLS for both incoming and outgoing. It clearly think TLS should be required but older versions should be allowed. The above seem to be relatively tough questions to get an answer for. Should I require TLS on our Kerio Connect server?.ChatGPT gives it a try) Show: Today's Messages :: Show Polls :: Message Navigator Note: Results from MxToolbox might not always be accurate or updated.Home » GFI User Forums » Kerio Connect » Should I require TLS? (A surprisingly tough question to get answered. The successful output will be similar to the following:įor more information about different commands, you can refer to the official OpenSSL documentation or the OpenSSL s_client Commands third-party reference documentation. Once the SSL/TLS configuration has been changed, it is recommended to run the OpenSSL s_client validation commands from the Linux/macOS machine.įor example, to check if the server supports TLSv1.2, please run the following command: openssl s_client -connect : -tls1_2 If it has not been set, Google Chrome might show a Not Secure website message. ![]() To resolve compatibility issues, configure the SSL Certificate Authority with Certificate Transparency = Yes. The Google Chrome browser might have some compatibility issues with OCSP (Online Certificate Status Protocol) stapling. List all strong ciphers by running the standard OpenSSL command: openssl ciphers 'HIGH:!aNULL:!MD5' Test the SSL/TLS settings by using the SSL Labs website. ![]() Here is an example of the mailserver.cfg settings, which includes the variables listed above: This variable allows Kerio Connect to decide which cipher set to use regardless of the client's preferences. This variable should be modified in both Security and SmtpSecurity tables. Permanently deletes a cipher from the list's Securityand SmtpSecuritytablesĮxcludes a cipher from the list (can be overwritten by the next ciphers) ServerTlsCiphers and ClientTlsCiphers will be the following: AESGCM:HIGH:+EDH-DSS-DES-CBC3-SHA:+DES-CBC3-SHA :!ECDHE-RSA-AES256-SHA384 AESGCM:HIGH:+EDH-DSS-DES-CBC3-SHA:+DES-CBC3-SHA: !ECDHE-RSA-AES256-SHA384 ! (exclamation point) Modify the server and the Client TLS cipher variables to delete the cipher from the list permanently. Note: In the OpenSSL site, the cipher is equal to the ECDHE-RSA-AES256-SHA384 value.
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