On Mon, Nov 18, 2002 at 12:31:49PM -0800, David Masterson wrote:
> Hmmmm.  If it was truly "opt-in", why would they need to avoid
> filters?  They could simply have their customers white-list them.

If the ISP sets up some spam filtering program that deletes everything
suspected to be spam and doesn't give the customer the option of
changing the filter.

One year ago, a discussion mailing list that I run (ffml.anifics.com)
had the same IP address as another site that had an affiliate program
(its affiliates tended to send spam) and a mail forwarding service
(spam sent to a mail forwarder and then reported to spamcop ended up
blaming the forwarding service). As a result, that IP address got
blacklisted by osirusoft.

It turned out that the pacbell.net ISP used osirusoft, and mail from
any host listed in osirusoft was deleted automatically (SpamAssassin
assigns a score of 2.7 to hosts listed in osirusoft, which isn't
enough by itself to tag a message as spam). Several members on my
mailing list had that ISP and contacted me asking why they couldn't
get their messages. I told them to ask their technical support to stop
filtering us. They did so, but their technical support refused to do
anything about the filter!

So, I think that's why opt-in mailing list owners want to avoid being
filtered in the first place, because ISPs can be overzealous in
filtering spam sometimes. Also, the customer might not be tech-savvy
enough to setup a whitelist even if his ISP allows it.


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