Error Sending email through Custom PHP Script

Summary

Failed: MailMessage::send failed: Application Error Description: default mailbox is not configured: 'from_address' is not set

Content (required):

I am getting the following error (the account used for initConnectAPI has the email address set)

See PHP code below

Failed: MailMessage::send failed: Application Error Description: default mailbox is not configured: 'from_address' is not set

Thanks!

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

try{

    $to_email  = "****@gmail.com";

    $cc_email  = "[email protected]";

    $from_email = "[email protected]";

    $subject="Testing OSC";

   

    $html_body ="HTML content goes here";