Sending message without recipients

#1

I have realized it is possible to send an e-mail without recipients: no To, CC or BCC.

Email is sent, and then returned as there are no recipients.

Interface should validate whether the To, CC or BCC fields are filled and act accordingly.

Regards,
Carlos Dourado

#2

Error message from Mailer-Daemon@runbox.com

“A message that you sent contained no recipient addresses, and therefore no delivery could be attempted.”