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I can send a mail, but not receiving mails back

Hi, i use to receive emails before, but recently, when anyone send a mail to me they get the message below. The address is valid, because i used it to send the mails.


Address not found
Your message wasn't delivered to because the address couldn't be found. Check for typos or unnecessary spaces and try again.


Please have a look at for me


Same here.....


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

    host [xxx]

    SMTP error from remote mail server after RCPT TO:<>:

    550-Please turn on SMTP Authentication in your mail client.

    550-( [xxx]:xxx is not permitted to relay

    550 through this server without authentication.