Zitat von Leonardo Rodrigues Magalhães <[EMAIL PROTECTED]>:
Roman Medina-Heigl Hernandez escreveu:
- I wouldn't set up a global greylist filter, because all my receiving mail
is going to be delayed (I guess my users don't like this ;-))
after years deploying mail servers with greylisting enabled, i think
you should definitely, at least, try to greylist all your users. After
years doing that, i can guarantee that only quite a few users will even
notice the initial delay. The majority of users wont notice the mail
delay. And for those who noticed, most of them are quite happy knowing
that that's a new anti-spam feature, because they indeed are receiving
less spams.
and you should notice, as well, that deploying greylist may require
a good work on building some whitelists for matching your traffic. That
can help a lot avoiding the initial mail delay for messages coming from
big ISPs from your country and for big worldwide mail ISPs, like
Hotmail, Gmail, Yahoo, etc etc.
but what about SPAMs that cames from hotmail/gmail/yahoo ?????
Greylist wont help there .... greylist only tries to separate real mail
servers and one-shoot softwares that spammers uses. If some spammers
uses a real server for sending spam messages, than it would pass
greylist anyway, as the server, at some point, would retry to send and
the message would be accepted.
100% Ack
We use greylisting with automatic whitelisting of clients which have
retried (MTAs) and some short list of the most used providers
(gmx,web.de,hotmail,yahoo...) which we do not greylist. After some
time nearly all the mailservers used by busines contacts are in the
whitelist anyway an for new contacts delay of some hours does not
matter at all.
This saved us form blocking all sort of proviers,TLDs, dynamic-dial-up
etc. to get rid of most spam. The most affected accounts now get
around 1 spam a day compared to more then 50 before greylisting.
Regards
Andreas
--
All your trash belong to us ;-) www.spamschlucker.org
To: [EMAIL PROTECTED]
