안녕하세요.웹서비스를 만들고 있는데 문의메일 보내는 형태로 웹전송 서비스를 추가했습니다.smtp서버는 다른데서 하나 빌린걸 받았고smtp20.example.jp 이런식으로 호스트 주소도 받았습니다.그리고 jsp,servlet, mail-1.4.7.jar 로 메일전송 로직을 만들었습니다.로컬에서 테스트시 메일 전송이 깔끔하게 잘 됐습니다.문제는 윈도우 서버에 배포를 하였는데 전송실패가 되는겁니다.방화벽에 587 포트를 열었고, smtps로도 전송을 시도 해봤는데 모두 실패 했습니다.이유가 뭘까요?혹시 받은 호스트서버에서 어떠한 권한을 열어주어야 되는걸까요 에러코드 첨부합니다. javax.mail.MessagingException: Could not connect to SMTP host: smtp20.gmoserver.jp, port: 587; 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:1961) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654) at javax.mail.Service.connect(Service.java:317) at javax.mail.Service.connect(Service.java:176) at javax.mail.Service.connect(Service.java:125) at main.MailSender.doPost(MailSender.java:119) at javax.servlet.http.HttpServlet.service(HttpServlet.java:555) at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:673) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834)Caused by: 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:170) at java.base/sun.security.ssl.ClientHandshakeContext.<init>(ClientHandshakeContext.java:103) at java.base/sun.security.ssl.TransportContext.kickstart(TransportContext.java:245) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:409) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:388) at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:549) at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:354) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927) ... 29 more

배포를 처음 해보는거라...로그 폴더에 가서 로그확인을 했는데, 이부분에 대한 로그도 안찍힙니다.로그 설정도 손봐야 되나보군요.Test-NetConnection -ComputerName smtp20.exj.com -Port 25이렇게 메일서버 테스트 해봤더니 25는 false가 뜨고, 587, 465는 true가 뜹니다...로그는 설정되면 가지고 오겠습니다.릴레이 설정에 대해 알아보겠습니다. 우선 감사합니다. 후 ...