postfix spamfilter a shell prikaz trap

[Jiří Veselský]

> premejslim o necem podobnym
> postu mam jak ty (postfix, virtualni uzivatele a spamassassin), ale me 
> by stacilo ty spamy presmerovat na uzivatele "spam". Moje idea byla 
> zatim takova, ze pomoci header_checks mapy bych nedefinoval
>
> /^Subject: .*SPAM* /
> REDIRECT spam at moje.domena
>
> zatim jsem to teda nezkousel, je to jen takova idea jeste nedotazena 
> do konce. Nejsem si ani jistej, jestli ten header_checks je aplikovan 
> jen na prvne prichozi maily, nebo i na maily vracene spamassassinem
>
> s tim by mi moh nekdo poradit
No jestli muzu... nerikas jak dostanes zpravu do spamassassina.
Je vice cest.
Vsechny zpravy prochazi "cleanup"-em, ktery je soucasti postfixu a zde 
se provadi"header-checks"
Problem je v tom, ze napriklad pokud spamassassin nakonfigurujes jako 
"milter" (smtpd_milter = local:/var/run/spamass-milter.sock), tak zprava 
nejdrive projde pres cleanup a potom teprve jde do spamassassina a tudis 
radek hlavicky "X-Spam-Status: ..." je pridan az po "cisteni" zpravy a 
tudis neprojde zminovanym header_checks.
Dalsi moznost je poslat zpravu do spamassassina pomoci smtp a 
spamassassin ti to vrati na jiny port, kde samozrejme header_checks 
zpravy presmeruje jak pozadujes.
Treti moznost je pouzit amavis nebo nejaky LDA, ktery ti dovoli 
definovat pravidla.

Co se me tyce, tak mam variantu 1 (milter) a cekam az vyjde Postfix 2.7, 
kde Wietse doprogramoval direktivu "milter_header_checks", ktera jiz 
prochazi zpravy az po vsech definovanych milterech. Prikladam uryvek 
emailu od Wietse a timto mu velmi dekuji:
-----
I have added header checks for Milter-generated mail headers.
The feature is called "milter_header_checks".

It is available from Postfix mirrors as postfix-2.7-20090607, and
also available as an optional patch for Postfix 2.6.

Wietse

milter_header_checks (default: empty)

Optional lookup tables for content inspection of message headers that
are produced by Milter applications. See the header_checks(5) manual
page available actions. Currently, PREPEND is not implemented.

The following example sends all mail that is marked as SPAM to a spam
handling machine. Note that matches are case-insensitive by default.

/etc/postfix/main.cf:
milter_header_checks = pcre:/etc/postfix/milter_header_checks

/etc/postfix/milter_header_checks:
/^X-SPAM-FLAG:\s+YES/ FILTER mysmtp:sanitizer.example.com:25

The milter_header_checks mechanism could also be used for whitelisting.
For example it could be used to skip heavy content scans for DKIM-
signed mail from known friendly domains.

This feature is available in Postfix 2.7, and as an optional patch for
Postfix 2.6.
-----
Jirka




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