title: I can't send emails on Ubuntu server [javax.net.ssl.SSLHandshakeException]
body: <p>I can't send emails on Unbuntu server suddenly.</p>
  <p>It's happened since today.
  It's still working on local.</p>
  <pre><code>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:1907)
  at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:666)
  </code></pre>
  <p><strong>JAVA:</strong><br/>
  openjdk version &quot;11.0.11&quot; 2021-04-20<br/>
  OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04)<br/>
  OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing)</p>
  <p><strong>Post-Handshake New Session Ticket arrived:</strong><br/>
  SSL-Session:<br/>
  Protocol  : TLSv1.3<br/>
  Cipher    : TLS_AES_256_GCM_SHA384</p>