ram schrieb:
On Fri, 2008-08-01 at 08:18 +0200, [EMAIL PROTECTED]
wrote:
Hallo postfix-users,
Occasionally external systems are tying to send mail with a
faked sender address via my system. So far no harm is done,
ad they have not been able to create a real user name. But
I would like to stop them before they use my mail system,
as soon as they make contact. How can I do this?
Example:
Jul 31 15:31:02 duinheks postfix/smtpd[29511]: NOQUEUE: reject: RCPT from
unknown[218.20.152.23]: 550 5.1.0 <[EMAIL PROTECTED]>: Sender address
rejected:
User unknown in local recipient table; from=<[EMAIL PROTECTED]>
to=<[EMAIL PROTECTED]> proto=ESMTP helo=<chenzao>
I dont see any reason for you to worry. You are doing a
reject_unauth_destination already
There is no way to stop *all* unauthorized connections ( as soon as they
connect ? ). You could use RBL's like zen.spamhaus etc on connect that
will stop a lot of them but not all
reject_unknown_reverse_client_hostname
helps a lot here
--
Best Regards
MfG Robert Schetterer
Germany/Munich/Bavaria
