Undelivered Mail Returned to Sender

[mutaharpk]

when i send email below address i got this message.(several time)

1)Delivery to the following recipient failed permanently:

 [e-mail]

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain bigpond.com by extmail.bigpond.com. [61.9.189.122].

The error that the other server returned was:
550 5.1.1 <[e-mail]> recipient rejected. IB603a

2)Delivery Status Notification (Failure)
The following message to <[e-mail]> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'sorry, no mailbox here by that name (#5.1.1)'

3)Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error. The following address
failed:

"[e-mail]":
SMTP error from remote server after RCPT command:
host: extmail.bigpond.com
5.1.1 <[e-mail]> recipient rejected. IB603a

can anyone help me how to solve this.

[pritaeas]

It says [e-mail] doesn't exists, send to the right address.

[CimmerianX]

Yep - right here:
The following message to <[e-mail]> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'sorry, no mailbox here by that name (#5.1.1)'