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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 info@cs-sunn.org because the address couldn't be found. Check for typos or unnecessary spaces and try again.

 

Please have a look at for me

1 REPLY 1
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Re: I can send a mail, but not receiving mails back

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:

 

  info@xxxnternational.com

    host xxxinternational.com [xxx]

    SMTP error from remote mail server after RCPT TO:<info@xxxinternational.com>:

    550-Please turn on SMTP Authentication in your mail client.  ns71.webhostsg.com

    550-(web107.webhostsg.com) [xxx]:xxx is not permitted to relay

    550 through this server without authentication.