I have put together an email in eNewsletter and tried to do a test send. I sent it three times.
First, to an email of mine that is hosted through my webhost and is in the same account as the sending site, but on a different domain. That email went through, all the way to my Thunderbird client.
Next I sent a test to my partner, on a different server in Utah. He has never received it.
I then sent my wife the test to her YMail address. She didn't receive it either.
Just to be sure, I repeated the first step, and again I got the email.
ps- In all cases, the "Your mail has been sent" box opened and told me the mail had...well...been sent.