RE: [courier-users] SpamAssassin during SMTP dialog

Dirk Kulmsee wrote:
> We all would love to block spam at the earliest stage, but at least here
> in Good ol' Germany you are half way in Jail if you do so.
> Mail & letters are PERSONAL and you may not intrude.

This is nonsense. Just put a clause into your AGB (Terms and Conditions),
then you're fine.

> How do you (all) do it?

I use Courier::Filter[1] to reject, during the SMTP transaction, messages
that come from a blacklisted sender (using various DNSBLs), fail an SPF
test, contain a virus (according to ClamAV), or contain attachments with
certain filenames (e.g. .exe, .com, .scr).

For rejecting spam, I rely solely on reputation systems (i.e. blacklists)
and I recommend to my users that they use the SpamCop reporting service[2]
to report spam.

Rejections are logged into an SQL database, and users can log into a
service website and see the rejected messages that were directed to them.
See [3] for an anonymized sample list (yes, it's a bit slow currently, and
the dynamic elements don't work with IE, which is broken).

References:
1. http://search.cpan.org/dist/Courier-Filter
2. http://www.spamcop.net/anonsignup.shtml
3. http://io.link-m.de/public-stats/mail-rejected-messages



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