On 11/08/2012 11:39 PM, Daniele Nicolodi wrote:
On 08/11/2012 23:21, Jeroen Geilman wrote:
Postfix cannot detect a mail loop if it has never seen the message before.
You are not re-injecting the filtered message, you are (or, rather, SA
is) calling sendmail(1), which in turn invokes pickup(8):
Nov 8 12:35:47 zed postfix/pickup[2485]: BCDF560EF: uid=65534
from=<instant.checkm...@designakeackson.info>
This means a different path is followed from the original submission
over SMTP; sendmail-submitted mail generally lacks features that allow
such loops to be detected.
In this case, you are using the "nobody" user to re-submit the message,
which will throw postfix off further, since it has no MAIL FROM: to
match it with.
Re-inject the message over a separate smtpd(8) instance instead; the
content filter loopback will not alter the envelope, thus enabling
postfix to detect a loop.
smtpd(8): MAIL FROM: joe@home, RCPT TO: jim@work -> Spamassassin -> SMTP
re-inject: MAIL FROM: joe@home, RCPT TO: jim@work.
sendmail(1): MAIL FROM: joe@home, RCPT TO: jim@work -> Spamassassin ->
sendmail: MAIL FROM: nobody (uid=65534), RCPT TO: jim@work.
Note the "nobody" above.
Hello Jeroen,
thank you for your reply, but I do not follow you. My problem is that a
mail forwarding loop is detected where I suppose there should be none,
not the opposite. The same log you quite, imho shows that a proper FROM
was indeed provided by sendmail, as I believe that Postfix reports the
envelope sendere and not the From: header in its logs.
Ah, I see. I misread the question, then.
See David's response for a possible explanation.
My configuration is basically what described as "Simple content filter
example" in the documentation: http://www.postfix.org/FILTER_README.html
Cheers,
Daniele
--
J.
