Hustle Double Opt In


We have installed Hustle and opted to use Sendy

We have setup sendy and configured it, setup the amazon part and been approved by amazon

We have setup hustle and it appears to be working fine with sendy

We added an email into the hustle popup box and it is appearing in the list in sendy OK and showing as unconfirmed.

But we are not getting the opt in email confirmation email into our email account

Any idea on how we can troubleshoot and find out why sendy is not sending out the email?