Nick,
Any list service of moderate or large size will leak spam, some more,
some less, but it's fairly bad wherever you go because the spammers tend
to have the larger lists, but probably only represent the minority of
their customers.
Roving.com (ConstantContact), bCentral, some of Topica, etc. all
experience these issues. There is no magic bullet to solving this
issue. You either block some legitimate E-mail or you allow through
some spam. Since my first priority is to deliver the good E-mail, I
choose to leak a bit of the spam. Content based filters are best for
this type of thing. Sniffer will tag some payload domains that are
separate from the provider (but you might have to remove some of the
provider rules in your rule base if they false positive), and tools that
do SURBL type lookups can be useful in separating the wheat from the
chaff, though they also tend to false positive on the provider's domains
on occasion. Using IP-based RBL's to differentiate between the good and
the bad here is a losing battle, and the results are inconsistent
because of things like SpamCop.
This was a huge issue for me along with legitimate bulk-mail because
there is hardly a resource out there that doesn't have false positive
issues on this content. My solution was to identify all such companies
by way of IP space and reverse DNS entries so that I could disable the
IP4R tests (by giving credit back), and then just simply relying on
content/payload filtering to take care of the spam that might come from
them. This was a ton of work and there are new additions to my lists
all the time, but it has paid off for me.
Matt
NIck Hayer wrote:
Does anyone have a list of newsletter [revdns?] senders that are
trusting to not send spam that they would be willing to share? I send
quite a bit of time trying to figure out if some emails are actuall
valid - for example stuff from roving.com, etc.
Thanks!
-Nick
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