It seems like their soft started analyzing the return codes, and so they are
resending their mail after a short while. So I think blacklisting is still in
rule.
--
Since greylisting has become more defacto, I have seen more
successfull 411 like spam squeezing through "legitimate" email
servers with free web emails and expecially the old excitenework,
and then the scoring is low on spamassassin on our side
even with SARES, because they craft the words better.... :(
So you still need to block by content, but that's getting harder also.
Since the need block by content scanning, the changes of errors
are higher, thus the need to craft the 5.5.0 error message with
someting like, call or fill out form on this website to get whitelisted...
A while back I had posted a question about grey listing, and if it
got answered I missed it....
Basically for spamd we can edit the /etc/spamd.conf so that black
listings get a specific message when rejected, good...
But what about greytrapping?
When an email gets rejected due to greytrapping, what error message
can be returned? how do you put that in /etc/spamd.conf
Somehow occassionally a legit server sends an email to a poison
address, maybe a spammer can use known poison emails and fake them
as from, then they spam legit servers, they in return send email
to the poison address and get greytrapped? ARGH....
