Ada user saya yg kirim email ke bcafinance.co.id dan mendapat reject sbb :

This is the mail system at host smtp1.biz.net.id.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email protected]>: host mail.bca.co.id[202.6.210.2] said: 550
    Denied by policy (in reply to end of DATA command)


Saya coba kirim email ke [email protected] eh malah user unknown 
binun deh.
Ada ide utk solusinya ?

Thanks



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