-Dmail.smtp.starttls.enable=true 

javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
 at java.base/sun.security.ssl.HandshakeContext.<init>(HandshakeContext.java:169)
 at java.base/sun.security.ssl.ClientHandshakeContext.<init>(ClientHandshakeContext.java:98)
 at java.base/sun.security.ssl.TransportContext.kickstart(TransportContext.java:216)
 at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:395)
 at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:507)
 at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
 at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
Caused: javax.mail.MessagingException: Could not connect to SMTP host: smtp.yandex.ru, port: 465;
  nested exception is:
 javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
 at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
 at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
 at javax.mail.Service.connect(Service.java:317)
..........

Running as SYSTEM
Building in workspace /var/lib/jenkins/workspace/test-item
Checking for pre-build
Executing pre-build step
Checking if email needs to be generated
No emails were triggered.
[test-item] $ /bin/sh -xe /tmp/jenkins2305405028249091314.sh
+ ssh root@192.168.1.2 12124
Host key verification failed.
Build step 'Выполнить команду shell' marked build as failure
Sending e-mails to: myuser@mydomain.ru
ERROR: Could not convert socket to TLS
javax.mail.MessagingException: Could not convert socket to TLS;
 nested exception is:
 javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
 at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1880)
 at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:648)
 at javax.mail.Service.connect(Service.java:317)
...............