Re: Postmap Results Look Odd

From: Brian Evans (no email)
Date: Wed Apr 23 2008 - 15:15:34 EDT

  • Next message: Carlos Williams: "Re: Postmap Results Look Odd"

    Carlos Williams wrote:
    > I notice that my /etc/postfix/header_checks are doing a small portion
    > of filtering out w/ little false positives however when I tried to add
    > an entry into /etc/postfix/header_checks for the 1st time, I ran the
    > postmap /etc/postfix/header_checks command and received a strange
    > output from Postfix which leads me to beleive something is wrong
    > here...
    > Let me start by stating what my goal was:
    > I wanted to disable "all" smtp inbound and outbound traffic to my
    > domain as a test. I basically don't want anyone on this email server
    > to be able to send or receive email from a specific domain. I was told
    > to go to "header_checks" and enter this:
    > /^To: <*>/ REJECT We do not send email to this domain
    > /^From: <*>/ REJECT We do not accept email for this domain
    > I want the sender to receive notification that the message will not be
    > relayed to its destination based on this rule so I did not want to use
    > "DISCARD"
    > So before I go deeper into my issue, was this the correct thing to do
    > to obtain the goal I wanted? I assume a header_check entry would
    > suffice and work but you guys are the experts.
    You may wish to consider check_sender_access and check_recipient_access
    tables in your smtpd_sender_restrictions and
    smtpd_recipient_restrictions respectively. (after
    reject_unauth_destination of course)

    Note: filtering by what a transaction gives you as a FROM (both envelope
    and header) is highly unreliable and easily forged.
    > Secondly after I added this to my "header_checks" file, I ran "postmap
    > /etc/postfix/header_checks" and got a strange output which to me looks
    > like Postfix does not like my header_checks file format or something
    > to that nature:
    > Here is what I got:
    > postmap: warning: /etc/postfix/header_checks.db: duplicate entry: "/^x-mailer:"
    > postmap: warning: /etc/postfix/header_checks, line 474: record is in
    > "key: value" format; is this an alias file?
    > header_checks = regexp:/etc/postfix/header_checks
    regexp files do not get postmap run on them.. Although, you can, and
    should, run postmap using the -q option to validate entries.
    See `man 1 postmap`


  • Next message: Carlos Williams: "Re: Postmap Results Look Odd"

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