Postfix is not rejecting recipients addresses when mailx is used

filtermailxpostfix

I have a problem with postfix to reject outgoing email for some address in blacklist.

This is my configure /etc/postfix/main.cf:

smtpd_recipient_restrictions = 
      check_recipient_access hash:/etc/postfix/bad_recipients, permit_mynetworks, reject_unauth_destination, permit

File /etc/postfix/bad_recipients:

phongdang@chotot.vn REJECT

Then I use command:

postmap /etc/postfix/bad_recipients

to create bad_recipients.db

and restart postfix: /etc/init.d/postfix restart

Then I try send mail to phongdang@chotot.vn: 

echo "hello world" | mailx -s "Test from CLI" phongdang@chotot.vn

Maillog:

Nov  4 19:54:50 cent6 postfix/pickup[32452]: 851B011FD2B: uid=0 from=<root>
Nov  4 19:54:50 cent6 postfix/cleanup[32491]: 851B011FD2B: message-id=<20141104125450.851B011FD2B@cent6.5-template>
Nov  4 19:54:50 cent6 postfix/qmgr[32453]: 851B011FD2B: from=<root@cent6.5-template>, size=447, nrcpt=1 (queue active)
Nov  4 19:54:50 cent6 postfix/smtp[32493]: connect to ASPMX.L.GOOGLE.COM[2607:f8b0:400e:c02::1b]:25: Network is unreachable
Nov  4 19:54:51 cent6 postfix/smtp[32493]: 851B011FD2B: to=<phongdang@chotot.vn>, relay=ASPMX.L.GOOGLE.COM[74.125.28.26]:25, delay=1.2, delays=0.05/0/0.6/0.51, dsn=2.0.0, status=sent (250 2.0.0 OK 1415105691 x3si145045pdr.187 - gsmtp)
Nov  4 19:54:51 cent6 postfix/qmgr[32453]: 851B011FD2B: removed

And I receive email although I restricted email phongdang@chotot.vn. Please help me fix it.

Best Answer

  • It is because smtpd_recipient_restrictions only apply to the mails received by smtpd daemon through an SMTP transaction.
  • The mails submitted using sendmail or mailx command is queued in maildrop queue by postdrop command, which is picked up by pickup and fed to cleanup directly.

You can't restrict recipients for the mails submitted through sendmail or mailx commands.

The only solution to this problem is force your applications to send mail only through smtp.

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