Konfigurasi Postfix-nya seperti ini:
Buka dan edit-lah file main.cf :
# vi /etc/postfix/main.cf
pada blok SMTPD, ubahlah dan lengkapilah seperti di bawah ini:
# Setting SMTPD
#
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions =
permit_mynetworks,
reject_non_fqdn_hostname,
reject_invalid_hostname
smtpd_sender_restrictions =
permit_sasl_authenticated,
permit_mynetworks,
reject_non_fqdn_sender,
reject_unknown_sender_domain
smtpd_recipient_restrictions =
reject_unauth_pipelining,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
reject_unverified_sender,
reject_unverified_recipient,
reject_rbl_client bl.spamcop.net,
reject_rbl_client dnsbl.sorbs.net,
reject_rbl_client cbl.abuseat.org
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
smtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
Simpanlah, lalu restart Postfix : # /etc/init.d/postfix restart
Gerakan Open Source 