It looks like there is an error with where the WA_SecurityAssist_SendMail call is being made. The mailFrom isn't being set up correctly. In the EmailPW.php page, find the place where the fromAddress and fromAddressDisplay are being set (you can search for either of those) and make sure they are set to your email address and the display that you set up in the wizard. It should look something like this:
"fromAddress" => "firstname.lastname@example.org",
"fromAddressDisplay" => "displayname",
Let me know if that is the issue or not.