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Email sender is using an old mail client

Discussion in 'E-mail Discussions' started by jason_isl, Jan 16, 2018.

  1. jason_isl

    jason_isl Registered

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    Dear All,

    My email cannot receive any email from a domain. And i have check the Delivery Report, there are no any record about it. But i have find some error in exim_maillog.

    2018-01-07 02:32:40 TLS error on connection from exchtp.xxxx [xxxxx]:5945 (SSL_accept): error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher
    2018-01-07 02:32:40 SMTP connection from exchtp.xxxx [xxxxx]:5945 closed by EOF

    I find out some information. Those said sender is using an old mail client. Can I fix the problem on my side?

    Thanks a lot
    Jason
     
  2. cPWilliamL

    cPWilliamL cP Technical Analyst II
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    Hi @jason_isl,

    Sorry to hear you're facing issues with an outdated mail client. I'd recommend updating the client or OS to ensure that it's using modern and secure ciphers/protocols; however, I understand that can be difficult. In cPanel 68, on new servers, we updated the cipher list:
    68 Release Notes - Version 68 Documentation - cPanel Documentation

    You may try setting the old ciphers below at WHM > Service Configuration > Mailserver Configuration: SSL Cipher List:
    Code:
    ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS
    
    However, realize that this decreases your security for all users.

    Thanks,
     
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