From: "Gabriel Diaz" <gabidiaz@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] spam protection vs. secondary mx'es
Date: Wed, 29 Nov 2006 17:33:59 +0100 [thread overview]
Message-ID: <82c890d00611290833w276f2bd0rb5e38df8b1920d12@mail.gmail.com> (raw)
In-Reply-To: <87ejrmdxus.fsf@jorgito.magma.com.ni>
Hello
>
> Nowadays running a mailserver is becoming cumbersome. However in the
> overall picture it is better not to use a mass-mail hoster like yahoo,
> gmx and the like, because it allows spammers to masquerade their
> messages behind *@yahoo.com addresses, which you are unlikely to
> block, since so much other people use them.
>
SPF can help with this one, if the spammer's mail from: is from
yahoo.co.jp or gmail.com, or gmx.de, you can test against their spf
records. (actually yahoo only have spf on its co.jp domain and gmail
is ?neutral).
http://oliva.9grid.es/magic/webls?dir=/soft/gdiaz/spf
you can download spf.c. mkfile and a "man page".
i'm testing it, but i cannot find domains with macro strings, so i
tested offline as much as i could.
feedback and fixes appreciated :)
gabi
PD: you will need to modify /sys/src/upas/smtp/smptd.c and
/mail/lib/validatesender to get it running.
next prev parent reply other threads:[~2006-11-29 16:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-29 9:35 Robert Raschke
2006-11-29 12:19 ` erik quanstrom
2006-11-29 19:37 ` Dave Lukes
2006-11-29 14:35 ` William Josephson
2006-11-29 16:24 ` Georg Lehner
2006-11-29 16:33 ` Gabriel Diaz [this message]
2006-11-29 16:36 ` William Josephson
2006-11-30 20:53 Steve Simon
2006-11-30 21:05 ` William Josephson
2006-11-30 23:16 ` Michael Batchelor
2006-11-30 23:30 ` William Josephson
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