SMTP outgoing connection over TLS does not work in Outlook: lost connection lost connection after CONNECT from unknown

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  • Avatar
    Miha Gregorš

    Hi,

    I get this type of error in logs from other smtp/mail servers that cannot communicate with our Plesk mail server.

    SSL_accept error from unknown[203.0.113.2]: lost connection
    lost connection after CONNECT from unknown[203.0.113.2]

    I there any handshake problem?

    I have grep 'smtpd_tls_mandatory_protocols' /etc/postfix/main.cf
    smtpd_tls_mandatory_protocols = TLSv1 TLSv1.1 TLSv1.2

    Regards, Miha

  • Avatar
    Ivan Postnikov

    Hello @Miha, please, try the solution from this article.

  • Avatar
    Miha Gregorš

    Hi,

    thx, I will try to reinastall ca-certificates. Is plesk repair mail needed?

    Regards, Miha

  • Avatar
    Ivan Postnikov

    @Miha

    Yes, it is required to repair mail server configuration. 

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