Steps to reproduce

1.  Use an instance which has SSO-3.0.0 installed
2.  Configure SSO module to map email attribute from the openID
3.  Check that when Mail modules tries to send an email it fails throwing an UnsoportedOperationException

Expected results

The email is properly retrieved from the external user and the email is sent

Actual results

UnsoportedOperationException is thrown

Workaround

N/A

Development notes

When the MailVerifyPresenter class (method sendSimpleMail) tries to send the email, it fails because it does't check it the user is MgnlUser or an ExternalUser:

String userEmailAddress = PropertyUtil.getString(SessionUtil.getNodeByIdentifier(RepositoryConstants.USERS, MgnlContext.getUser().getIdentifier()), PROPERTY_EMAIL);

Discovery

Regarding this specific problem, in fact the user email can be retrieved using MgnlContext.getUser().getProperty("email") which is a generic way for both MgnlUser and ExternalUser

Notes: Apply the same fix for both methods MailVerifyPresenter#sendSimpleMail and MailVerifyPresenter#sendTemplateMail (source code)