NethServer Version: 7.9.2009
Module: Basic conf
I’m trying to setup the smarthost feature in Settings, to a Plesk mailserver.
I’m always getting these error in maillog:
Apr 28 15:39:49 nethserver postfix/smtp[9235]: warning: TLS library problem: 9235:error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version:s23_clnt.c:769:
Is there a way o properly solve it?
Thank you,
It seems your plesk mail server still uses the old insecure SSLv2 so you should disable it and enable at least TLSv1.2, see Unable to connect to Plesk mail server via an email client: TLS handshaking: SSL_accept() failed - Support Cases from Plesk Knowledge Base
It’s also possible to set the TLS policy on NethServer to “default upstream policy” to allow SSLv2 but as mentioned above it’s insecure and therefore not recommended, see TLS policy — NethServer 7 Final