Is the mailing list sent? You say it takes a few seconds before moving on - what do you mean?
asp cdo-, , , CDO.Configuration. , , , :
Function GetConfig()
Dim oConfig
Set oConfig = CreateObject("CDO.Configuration")
oConfig.Fields("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2
'etc...
oConfig.Fields.Update
Set GetConfig = oConfig
End Function