Email Server Setup

I keep hearing that I don't need to have a user name and password for the LC server to send emails, but unless I put one in, nothing happens. I get the following error:

2008-01-15 12:13:40,993 ERROR [org.jboss.ejb.plugins.LogInterceptor] RuntimeException in method: public abstract java.lang.Object com.adobe.idp.dsc.transaction.impl.ejb.adapter.EjbTransactionCMTAdapterLocal.doSupports(c om.adobe.idp.dsc.transaction.TransactionDefinition,com.adobe.idp.dsc.transaction.Transacti onCallback) throws com.adobe.idp.dsc.DSCException:
ALC-DSC-000-000: com.adobe.idp.dsc.DSCRuntimeException: Internal error.
at com.adobe.idp.workflow.dsc.invoker.WorkflowDSCInvoker.transientInvoke(WorkflowDSCInvoker. java:311)
at com.adobe.idp.workflow.dsc.invoker.WorkflowDSCInvoker.invoke(WorkflowDSCInvoker.java:98)
at com.adobe.idp.dsc.interceptor.impl.InvocationInterceptor.intercept(InvocationInterceptor. java:134)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.proceed(RequestInterceptor ChainImpl.java:44)
at com.adobe.idp.dsc.transaction.interceptor.TransactionInterceptor$1.doInTransaction(Transa ctionInterceptor.java:74)
at com.adobe.idp.dsc.transaction.impl.ejb.adapter.EjbTransactionCMTAdapterBean.execute(EjbTr ansactionCMTAdapterBean.java:336)
at com.adobe.idp.dsc.transaction.impl.ejb.adapter.EjbTransactionCMTAdapterBean.doRequiresNew (EjbTransactionCMTAdapterBean.java:282)
at sun.reflect.GeneratedMethodAccessor344.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionConta iner.java:214)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionI nterceptor.java:149)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstance Interceptor.java:154)
at org.jboss.webservice.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor. java:54)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:389)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor. java:122)
at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624)
at org.jboss.ejb.Container.invoke(Container.java:873)
at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:415)
at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:88)
at $Proxy196.doRequiresNew(Unknown Source)
at com.adobe.idp.dsc.transaction.impl.ejb.EjbTransactionProvider.execute(EjbTransactionProvi der.java:143)
at com.adobe.idp.dsc.transaction.interceptor.TransactionInterceptor.intercept(TransactionInt erceptor.java:72)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.proceed(RequestInterceptor ChainImpl.java:44)
at com.adobe.idp.dsc.interceptor.impl.InvalidStateInterceptor.intercept(InvalidStateIntercep tor.java:37)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.proceed(RequestInterceptor ChainImpl.java:44)
at com.adobe.idp.dsc.interceptor.impl.AuthorizationInterceptor.intercept(AuthorizationInterc eptor.java:88)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.proceed(RequestInterceptor ChainImpl.java:44)
at com.adobe.idp.dsc.engine.impl.ServiceEngineImpl.invoke(ServiceEngineImpl.java:113)
at com.adobe.idp.dsc.ro