From: Magnus Bäck (no email)
Date: Thu Jan 01 2004 - 13:08:49 EST
On Thu, Jan 01, 2004 at 10:52:52AM -0700,
Jon Langton <> wrote:
> I screwed up my last email. Here is what I have:
> header_checks = regexp:/etc/postfix/header_checks in main.cf
> /^From: .*<>/ REJECT in header_checks file
Sigh. Why is it so hard for some people to just cut and paste, and
thereby avoid the problem of typos? You're wasting my time.
> With this config I see in /var/log/maillog an entry of From=<> size=3225,
> nrcpt=1 (queue active) then I see a bunch of outbound emails so I am
> assuming that they are using a null? from field to fool postfix into
> relaying email. Any ideas how to prevent this?
A null sender indicates a bounce. You *can* reject these (although not
with a header check as you've been attempting), but you must not do so.
Post your configuration ("postconf -n") and all relevant log entries for
a transaction like the one you described, and we can help you.
The problem here is that you might be an open relay. Ask about that. Do
not guess yourself to a solution and ask how that solution should be
implemented.
-- Magnus Bäck
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