Cannot send out messages

[vernalcity]

I am a newbie at this and I thought I had everything going well. We are receiving messages just fine, but when I try to send an email out, I get the following error-

method: SendMsgRequest
msg: system failure: Unable to send message
code: service.FAILURE
detail: soap:Receiver
trace: com.zimbra.common.service.ServiceException: system failure: Unable to send message ExceptionId:btpool0-4://192.168.1.21/service/soap/SendMsgRequest:1291157558002:88feb072f38b2be8 Code:service.FAILURE at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248) at com.zimbra.cs.mailbox.MailSender.sendMimeMessage(M ailSender.java:477) at com.zimbra.cs.mailbox.MailSender.sendMimeMessage(M ailSender.java:309) at com.zimbra.cs.mailbox.MailSender.sendMimeMessage(M ailSender.java:266) at com.zimbra.cs.service.mail.SendMsg.doSendMessage(S endMsg.java:189) at com.zimbra.cs.service.mail.SendMsg.handle(SendMsg. java:150) at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:420) at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:274) at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:158) at com.zimbra.soap.SoapServlet.doWork(SoapServlet.jav a:291) at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:212) at javax.servlet.http.HttpServlet.service(HttpServlet .java:727) at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:181) at javax.servlet.http.HttpServlet.service(HttpServlet .java:820) at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1166) at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(Set HeaderFilter.java:79) at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157) at org.mortbay.servlet.UserAgentFilter.doFilter(UserA gentFilter.java:81) at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter .java:132) at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:418) at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:230) at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114) at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152) at org.mortbay.jetty.handler.rewrite.RewriteHandler.h andle(RewriteHandler.java:230) at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152) at org.mortbay.jetty.handler.DebugHandler.handle(Debu gHandler.java:77) at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:543) at org.mortbay.jetty.HttpConnection$RequestHandler.co ntent(HttpConnection.java:939) at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:755) at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:218) at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:405) at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:413) at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:451) Caused by: com.zimbra.cs.mailbox.MailSender$SafeMessagingExce ption: Could not connect to SMTP host: vernalcity.org, port: 25; chained exception is: java.net.SocketTimeoutException: connect timed out at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTra nsport.java:1545) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SM TPTransport.java:453) at javax.mail.Service.connect(Service.java:291) at javax.mail.Service.connect(Service.java:172) at javax.mail.Service.connect(Service.java:121) at com.zimbra.cs.mailbox.MailSender.sendMessageToHost (MailSender.java:781) at com.zimbra.cs.mailbox.MailSender.sendMessage(MailS ender.java:702) at com.zimbra.cs.mailbox.MailSender.sendMimeMessage(M ailSender.java:412) ... 39 more
request:

I am on ZCS 6.0 on RHEL 5 virtualized in VMware ESXi 4.1. I have checked all of the settings I could think of, and even tried some troubleshooting techniques I found elsewhere such as making sure ports are open on the firewall and such.

If anyone has any ideas on what I could do, I would appreciate it. Thank you everyone!

[phoenix]

You need to take a lok in the MTA log files to see what the exact errors is.

[vernalcity]

I actually got it working, don't know what exactly it was (may have been just time for the DNS to process or something). Thank you for the response.