javamail不能发送邮件的问题
用javamail写的程序，本机测试可以发送邮件，放到服务器上面发不了，
本机telnet   smtp.163.com   25,成功，
服务器telnet   smtp.163.com   25，失败，
有人说是服务器的防火墙问题，有点不明白：
是不是只要telnet   smtphost   25失败，就无法发送邮件？要是的话，该怎么办呢？

错误提示：
16:47:43,921   ERROR   [STDERR]   javax.mail.MessagingException:   Could   not   connect   to   SMTP   host:   smtp.163.com,   port:   25;
    nested   exception   is:
java.net.ConnectException:   Connection   refused:   connect
16:47:43,921   ERROR   [STDERR]   at   com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
16:47:43,921   ERROR   [STDERR]   at   com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
16:47:43,921   ERROR   [STDERR]   at   javax.mail.Service.connect(Service.java:297)
16:47:43,921   ERROR   [STDERR]   at   javax.mail.Service.connect(Service.java:156)
16:47:43,921   ERROR   [STDERR]   at   javax.mail.Service.connect(Service.java:105)
16:47:43,921   ERROR   [STDERR]   at   javax.mail.Transport.send0(Transport.java:168)
16:47:43,921   ERROR   [STDERR]   at   javax.mail.Transport.send(Transport.java:98)
16:47:43,921   ERROR   [STDERR]   at   tff.util.SendMail.sendMessage(SendMail.java:63)
16:47:43,921   ERROR   [STDERR]   at   zzl.bean.CompanyOP.SendMailAfterRegister(CompanyOP.java:643)
16:47:43,921   ERROR   [STDERR]   at   zzl.servlet.CompanyNewServlet.doGet(CompanyNewServlet.java:146)
16:47:43,921   ERROR   [STDERR]   at   javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
16:47:43,921   ERROR   [STDERR]   at   javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
16:47:43,921   ERROR   [STDERR]   at   org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
16:47:43,921   ERROR   [STDERR]   at   org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
16:47:43,921   ERROR   [STDERR]   at   org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
16:47:43,921   ERROR   [STDERR]   at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
16:47:43,92