Tried to register an account using a free Yahoo email address. Got the error:

com.zimbra.cs.mailclient.CommandFailedException: LOGIN failed: LOGIN failure. Server Error-Please try again after some time. Error code 2

I suspect it is because it is a yahoo.co.uk address. Are these supported?

The log reports (email address obscured)

2008-07-28 11:32:12,642 INFO [btpool0-0] [name=zimbra;ip=127.0.0.1;] datasource - Testing DataSource: { id=9b179181-3db0-40b1-bee5-58fd5a305e42, type=imap, isEnabled=true, name=Yahoo!, host=imap.mail.yahoo.com, port=143, connectionType=cleartext, username=XXXXXXXXXXXXXXXXX@yahoo.co.uk, folderId=1 }
2008-07-28 11:32:12,798 INFO [btpool0-0] [name=zimbra;ip=127.0.0.1;] datasource - Server ID: null
2008-07-28 11:32:12,892 INFO [btpool0-0] [name=zimbra;ip=127.0.0.1;] datasource - Error connecting to mail store:
com.zimbra.cs.mailclient.CommandFailedException: LOGIN failed: LOGIN failure. Server Error-Please try again after some time. Error code 2
at com.zimbra.cs.mailclient.imap.ImapRequest.checkSta tus(ImapRequest.java:94)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendChec kStatus(ImapRequest.java:80)
at com.zimbra.cs.mailclient.imap.ImapConnection.sendL ogin(ImapConnection.java:118)
at com.zimbra.cs.mailclient.MailConnection.login(Mail Connection.java:205)
at com.zimbra.cs.datasource.ImapSync.connect(ImapSync .java:143)
at com.zimbra.cs.datasource.ImapSync.test(ImapSync.ja va:103)
at com.zimbra.cs.datasource.DataSourceManager.test(Da taSourceManager.java:66)
at com.zimbra.cs.account.offline.OfflineProvisioning. testDataSource(OfflineProvisioning.java:515)
at com.zimbra.cs.account.offline.OfflineProvisioning. createDataSourceAccount(OfflineProvisioning.java:5 67)
at com.zimbra.cs.account.offline.OfflineProvisioning. createAccount(OfflineProvisioning.java:419)
at com.zimbra.cs.service.admin.CreateAccount.handle(C reateAccount.java:58)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:411)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:268)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:160)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:266)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:727)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:188)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:716)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:406)
at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:211)
at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:139)
at org.mortbay.jetty.handler.RewriteHandler.handle(Re writeHandler.java:176)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:506)
at org.mortbay.jetty.HttpConnection$RequestHandler.co ntent(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:442)
2008-07-28 11:32:12,892 INFO [btpool0-0] [name=zimbra;ip=127.0.0.1;] datasource - Test failed: com.zimbra.cs.mailclient.CommandFailedException: LOGIN failed: LOGIN failure. Server Error-Please try again after some time. Error code 2