— buat file sender_access
cd /etc/postfix
nano sender_access
— isi nya misal ( bisa untuk domain global , atau user account )
abusivecustomer.net REJECT
kucing@customer.net REJECT
— masukan ke Data Base
postmap /etc/postfix/sender_access
— edit / masukan line berikut di main.cf ( di paling bawah baris)
nano /etc/postfix/main.cf
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access
— restart service
/etc/init.d/postfix restart
— test jika email nya kucing@customer.net pasti di reject oleh server
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