Preparations

1. open /index.php file for editing
2. replace the $application->Run(); line with this code (replace e-mails with different working e-mails you can access):

$application->emailUser(
    'TEST.EMAIL',
    null,
    array(
        'to_email' => 'email-one@dev-domain',
        'use_custom_design' => 1,
        'message' => '',
    )
);

$application->emailUser(
    'TEST.EMAIL',
    null,
    array(
        'to_email' => 'email-two@dev-domain',
        'use_custom_design' => 1,
        'message' => 'non-empty',
    )
);

3. save changes
4. login to the Admin Console
5. go to the Website & Content → E-mail Templates section
6. create a new e-mail template with this data:
   • Template Name: TEST.EMAIL
   • Subject: Empty email
   • HTML Version: <inp2:m_Param name="message"/>

Test Plan

1. visit the /index.php file from the Web Browser to trigger the e-mail sending code
2. login to the Admin Console
3. go to the User Management → Mailings section
4. press the Process Queue toolbar button on the Email Queue tab
5. confirm (in your e-mail client), that:
   • e-mail to the email-one@dev-domain e-mail wasn't sent
   • e-mail to the email-two@dev-domain e-mail was sent and it was the only recipient of that e-mail