bagaimana cara merubah code 450 ke 554 untuk domain not found /user unknownn?

Feb 16 20:34:49 hujan postfix/smtpd[12737]: reject: RCPT from 
ql02.cakraweb.com[209.25.148.151]: 
450 <[EMAIL PROTECTED]>: Sender address rejected: Domain not found; 
from=<[EMAIL PROTECTED]> 
to=<[EMAIL PROTECTED]>

seperti

Feb 16 09:20:05 hujan postfix/smtpd[7681]: reject: RCPT from unknown[202.107.49.86]: 
554 Service unavailable; [202.107.49.86] blocked using relays.ordb.org, reason: 
Blackholed by ORDB -- 
see <http://ordb.org/lookup/?host=202.107.49.86>; from=<[EMAIL PROTECTED]> 
to=<[EMAIL PROTECTED]>

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Asfihani - UIN 85858803
http://nyambik.its-sby.edu

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