Hi, thanks for your PR.

I will accept this because you've done the work to add the missing ConfigureAwait's but on a personal level I disagree about the readability of that method as I think ConfigureAwait(false) is one of the most poorly name method & parameter combinations that I've ever come accros.

With regards to your blocking issues that you are experiencing, do you have a sample that reproduces this? If so I can assist in debugging.

I did previously have a performance test harness that I used to run which would send through emails from the Enron Corpus database. I can try to find that and run it against your sample.

Thanks,
Cain.

@cosullivan The application where I see this happening does this:
Run smtpservice instance that on a message receive publishes the email via mqtt on rabbitmq. When sending a bunch of concurrent emails to it the mqtt stuff results in timeouts. I'm not experiencing this when I just publish the same or many more messages concurrently. At the moment I think it is something in the networking code but as this is a hobby project I don't have much time to research. I'll try to make it as small as possible.

By the way, would it be possible to release the current master on nuget?

I have pushed a new version from master.

Thanks,
Cain.