i read on Backscatterer.org powered by UCEPROTECT
that i need to use 550 as return code for unknown user
zimbra use 450 as postifx default
Postfix Configuration Parameters
"unverified_recipient_reject_code (default: 450)
The numerical Postfix SMTP server response when a recipient address is rejected by the reject_unverified_recipient restriction.
Unlike elsewhere in Postfix, you can specify 250 in order to accept the address anyway.
Do not change this unless you have a complete understanding of RFC 821. "
do u suggest me to change it?
what your opinion?
which files should i change?