the following i got from this userlist and i tried to implement it without
ful understanding
Existing primitives can do this already.
The example stops mail from yahoo.com/hotmail.com unless it comes from
specific systems.
Wietse
smtpd_sender_restrictions =
check_sender_access hash:/etc/postfix/strict_sender_map
smtpd_restriction_classes = strict_client_domain
/etc/postfix/strict_sender_map:
yahoo.com strict_client_domain reject
hotmail.com strict_client_domain reject
/etc/postfix/strict_client_map:
yahoo.com OK
hotmail.com OK
friendly.com OK
friendly.com is a host that sends/forwards legitimate mail
with a hotmail etc. sender address.
While we're improving, the following rules as posted would cause
mail from hotmail etc. to be bounced when the DNS times out.
This fixes it: do client hostname access control only when the
name lookup produced a definite (exists / doesn't exist) result.
strict_client_domain =
reject_unknown_client
check_client_access hash:/etc/postfix/strict_client_map
reject
unknown_client_reject_code = 554
Wietse
after i incorporated this into my main.cf i started getting the following
(to postmaster):
[email protected] (Mail Delivery System) Add Address to Contacts
To: [email protected] (Postmaster)
Date: 24/01/2009 04:38 PM
Subject: Postfix SMTP server: errors from d60-143.icpnet.pl[77.65.60.143]
Transcript of session follows.
Out: 220 relay1.xxx.xx ESMTP Postfix
In: HELO d60-143.icpnet.pl
Out: 250 relay1.xxx.xx
In: MAIL FROM:<[email protected]>
Out: 250 2.1.0 Ok
In: RCPT TO:<[email protected]>
Out: 451 4.3.5 Server configuration error
Session aborted, reason: lost connection
i get several messages like this; what can be this?
