Unable to receive verification code for custom sender address

It's weird. I created a noreply@mydomain.com and did the email verification but I never received the confirmation code. Yet when I created anything other than noreply@, I was able to receive the confirmation code. I had to create a submissions@ email.

Can I not use a noreply@ email?.....

Hello there, 

I'm afraid that you cannot use a noreply@yourdomain.com as a custom sender email address. Using noreply as the user will be considered as a spam and most likely will be rejected from our servers. So I would recommend using a different email.

Let us know if you need any help. Thank you.