>>>>>>Superb! Thanks once again Viv. What is interesting is that all the email is now being sent, but the code never hits the SendCompletedCallback.
>>>>>>
>>>>>>Oh, it also does not seem to be running asynchronously as I don't get control back in the UI for quite a while.
>>>>>>
>>>>>>One of these days I'll understand C# :(
>>>>>
>>>>>Viv,
>>>>>
>>>>>I commented out the wiatHandle.WaitOne(); and then my code stopped hanging. Do I need that line of code in there? Is it just in the wrong place?
>>>>
>>>>I think you need it - otherwise the whole PostAWBS method will exit before the async calls are complete. Are you sure all the emails were sent when it was removed ?
>>>>
>>>>P.S Ignore the update to my last post. As you found the SendCompletedCallback will fire whether it is static or not.
>>>
>>>You're right, just less than half were sent. So do I need to make my PostAWBs asynchronous too? How?
>>
>>If you're on .NET 4 then it's quite a bit more work than 4.5 which has the 'await' pattern :-{
>>
>>See this link : http://msdn.microsoft.com/en-us/library/2e08f6yc(v=vs.100).aspx
>>You'd need to use the last (most complicated :{ ) version : 'Execute a callback when an asynchronous call completes'.
>>
>>(or move to 4.5 :-} )
>
>Thanks, I'll check it out. 4.5 is not an option at the moment as Mere Mortals.NET doesn't support that version yet.

Shouldn't be any reason why a 4.5 application should not reference 4.0 assemblies. But, of course, you would need both for deployment.

Or, AFAIR, since MM includes source code you could recompile that for 4.5 .....