CDO.Message.1 error '80040213'The transport failed to connect to the server

Hi There

All of a sudden our website CDO script no longer sends forms.  We get the message:-

CDO.Message.1 error '80040213'

The transport failed to connect to the server.

/cart/EMailApplication.asp, line 144

I cant think what has changed to stop it working.  The relevant code ( I think) is:-

Function SendEmail(sndMailFromAddress, sndMailFromName, sndMailRecipient, sndMailCC, sndMailSubject, sndMailBody, sndAttachment)
  Dim objMsg
  Dim objConf

  Set objMsg  = Server.CreateObject("CDO.Message")
  Set objConf = Server.CreateObject("CDO.Configuration")

  With objConf.Fields
        .Item(cdoSendUsingMethod) = cdoSendUsingPort
       .Item(cdoSMTPServer) = GlobalMailHost
      .Item(cdoSMTPServerPort) = 25
      .Item(cdoSMTPAuthenticate) = cdoBasic
      .Item(cdoSendUserName) = GlobalMailUsername
      .Item(cdoSendPassword) = GlobalMailPassword
      .Update
  End With



  Set objMsg.Configuration = objConf

  With objMsg
        .From = """" & sndMailFromName & """ <" & sndMailFromAddress & ">"
        .To = sndMailRecipient
        if MailCC <> "" then
               .Cc sndMailCC
        end if
        .Subject = sndMailSubject
        .TextBody = sndMailBody
       if sndAttachment <> "" then
              .AddAttachment sndAttachment
        end if
   .Send (line 144)

And the settings used are:-

GlobalMailHost = "auth.smtp.1and1.co.uk"
GlobalMailUsername = "XXXXX@comptonskinner.co.uk"
GlobalMailPassword = "XXXXXXX"
'GlobalAdminEmail = "XXXX@firstchoice.org.uk"
GlobalAdminEmail = "XXXXXt@cscrecruitment.co.uk"
GlobalCompanyName = "CSC Job Shop"

Any help would really be appreciated.