Hi there!
Please ensure that you are not using the sending address as your test email; when you send an email to the same email address you sent it from, Gmail is always suspicious that someone is pretending to be you. That's why you will receive it in the spam or junk folder or will not receive it.
If you are not using the same sending address, it might need a little more digging from the team. I recommend that you send an email to help@convertkit.com17 so the team can take a look at your account.
Thank you!