Firmansyah wrote:
coba ini:
tambahkan baris berikut pada /etc/postfix/main.cf

### restric users from local to internet
smtpd_restriction_classes = local_only
local_only =
  check_recipient_access hash:/etc/postfix/local_domains
  reject_unauth_destination
  permit_mynetworks
  reject

smtpd_recipient_restrictions =
     check_sender_access hash:/etc/postfix/restricted_users
     permit_mynetworks
     reject_non_fqdn_recipient,
     reject_unknown_sender_domain,
     reject_unknown_recipient_domain,
     permit_mynetworks,
     reject_unauth_destination,
     permit

edit file /etc/postfix/local_domains
yahoo.com       OK
gmail.com        OK

edit file /etc/postfix/restricted_users
[EMAIL PROTECTED] local_only
[EMAIL PROTECTED] local_only

Kalau seperti diatas, maka [EMAIL PROTECTED] dan [EMAIL PROTECTED] bisa mengirim ke gmail dan/atau yahoo.com. Kemudian restriction classes local_only sangat rawan untuk disalahgunakan, misalnya akan SELALU meneruskan email dari sender user1 dan user2 @domainsaya.com ke yahoo dan gmail.

Rgds,
Asfihani

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