No, even if I typed an email address directly in the TO box, the email is not sent out.
See the screenshot.
I tested it twice with directly typing the email address not via the variable.
The first one is SMTP.
The second one is Gmail.
In either way, the emails are not sent.
I hope it could be helpful to figure out the problem.
I tested with my actual email address,
but I just changed it to a fake one right before sharing it here.