On 17/01/2026 11:46, Peter Uetrecht via Postfix-users wrote:
Hi John,
I expect emails from senders with the domain [email protected] addressed
to recipient [email protected] to be rewritten to recipient
[email protected]. I can't find any evidence that the Postfix pipe
daemon called the script, and therefore Sendmail can't resend the
email with a rewritten recipient. This is all I find in the logs, no errors.
Jan 17 10:45:19 pc postfix/smtpd[282165]: 08DDE196C31:
client=localhost[127.0.0.1]
Jan 17 10:45:37 pc postfix/cleanup[282170]: 08DDE196C31:
message-id=<[email protected]>
Jan 17 10:45:37 pc postfix/qmgr[282063]: 08DDE196C31:
from=<[email protected]>, size=412, nrcpt=1 (queue active)
Jan 17 10:45:37 pc postfix/smtp[282171]: 08DDE196C31:
to=<[email protected]>, relay=192.168.2.1[192.168.2.1]:25,
delay=29, delays=29/0.03/0.02/0, dsn=2.0.0, status=sent (250 ok:
Message 239712885 accepted)
Jan 17 10:45:37 pc postfix/qmgr[282063]: 08DDE196C31: removed
Jan 17 10:45:38 pc postfix/smtpd[282165]: disconnect from
localhost[127.0.0.1] helo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Hi Peter
you want to filter emails and you have defined a transport in master.cf
that will do that, but it looks like you are not actually directing
email into that transport.
In the example above, email is arriving via smtp from the localhost and
is correctly being delivered as per the relayhost setting.
In order to use your filter you will need to direct email to it in some
way. There could be multiple ways of achieving that, depending on the
exact scenario of this postfix server. It seems that the server does not
have any local recipients and that it receives email via smtp. It also
is expected to receive email via sendmail from your filter script. What
isn't clear to me is whether it also receives email via sendmail apart
from your script and that email from sendmail has to be filtered. Of
course the email from your script must not be filtered else it would
create a loop.
Bit if you are not planning to filter email arriving via sendmail
command You may fit into the scenario that is described here:
https://www.postfix.org/FILTER_README.html
in the section "Simple content filtering". If so that would require you
to make a configuration update in master.cf for the smtp service adding
the parameter "
-ocontent_filter
<https://www.postfix.org/postconf.5.html#content_filter>=rewritepipe:dummy
and reload postfix.
John
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