Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

TLS between MTA's?

Discussion in 'E-mail Discussion' started by akust0m, Jun 14, 2018.

  1. akust0m

    akust0m Well-Known Member

    Feb 19, 2016
    Likes Received:
    Trophy Points:
    cPanel Access Level:
    Root Administrator
    Hey :)

    I understand about SSL/TLS connections between client and server, but what about between MTA's?

    Will cPanel attempt to send via TLS by default to other MTA's? Will Exim in cPanel accept mail and send mail in plain text if the remote MTA doesn't support TLS for some reason?

    Is non-encrypted delivery common between MTA'S?

    Are there settings in cPanel to configure this behavior for Exim?

    Thanks in advance :)
  2. cPanelLauren

    cPanelLauren Forums Analyst II Staff Member

    Nov 14, 2017
    Likes Received:
    Trophy Points:
    cPanel Access Level:
    DataCenter Provider
    The sending MTA will connect over whichever protocol is specified by the sender's client and the receiving MTA must accept that protocol. If the sending server requests a connection over TLSv1.2 the receiving server must accept that protocol otherwise the connection is refused.

    The protocol is deemed by the client not the server, the client requests a connection over x protocol/s and the MTA facilitates that connection with the remote server.

    The only reason a non-encrypted connection would be made would be if it was requested by the client.

    You can modify the ciphers and protocols exim is able to use at WHM>>Service Configuration>>Exim Configuration Manager.

    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice