[103728] in North American Network Operators' Group
Re: Problems sending mail to yahoo?
daemon@ATHENA.MIT.EDU (Peter Dambier)
Sun Apr 13 04:12:05 2008
Date: Sun, 13 Apr 2008 10:07:37 +0200
From: Peter Dambier <peter@peter-dambier.de>
Reply-To: peter@peter-dambier.de
To: nanog@merit.edu
In-Reply-To: <20080413054539.152F22B3B2B@mx5.roble.com>
Errors-To: owner-nanog@merit.edu
Roger Marquis wrote:
>
> Sounds like the party line inside Yahoo, but there are plenty of ISPs that
> do a really good job of combating spam. They do it with standard tools
> like RBLs, Spamassassin, OCR, ClamAV and without ineffective diversions
> like SPF or DKIM.
>
Seen from inside, it is not spamfilters but it is the routing table.
I have seen spam dropping by 98% when zerorouting some networks.
Nobody complained about false positives :)
But this is another story for the big ones. They might have customers.
>
> The problem is that it is an art, not well documented (without reading
> 5 or 6 sendmail/postfix and anti-spam mailing lists for a several years),
> is not taught in school (unlike systems and network administration), and
> rarely gets measured with decent metrics.
>
That is true. Plus the rules are constantly changeing.
> Not that spam really has much to do with network operations, well, except
> perhaps for those pesky Netcool/Openview/Nagios alerts...
At the edge it does. It can bring your VoIP down and video on demand.
I know from campus networks who improved p2p service when zerorouting
networks known for sending spam.
Peter
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