undeliveable message to an email address that I did not use

Question

I sent a message from my email and I then received an email message Undeliverable with the following text Delivery has failed to these recipients or groups: ******@hotmail.com
The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly.

Inserted is a partial screenshot associated with the above message

Answer 1

Hi @Neil Lutz, 

Thank you for reaching out regarding the issue with your email delivery. 

We see that the recipient's mailbox is full. We suggest you should contact the recipient directly to ask them to clear some space in their mailbox, then try resending your message later. 

If you need further assistance, please let us know. 

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Answer 2

There is no screenshot attached, can you perhaps try again?

As for the non-delivery message itself, the recipient might have configured some sort of forwarding and thus messages are being copied/redirected to the address you did not specify. This is not something you can control on your end, so you can just ignore those messages. If you have other means of contacting the recipient apart from email, try letting them know about this behavior.