Dear Jonathan,
On 15:59 15.03.2003, you [Jonathan Angliss ([EMAIL PROTECTED])] wrote...
> Actually it is more than possible. Some ISDN blocks sit in the same block
> (/24) as dialups, albeit a different subnet mask. When RBL lists blacklist
> addresses, they often don't research into the extent of the range, and just
> block the whole /24 range, while the dialup range stops halfway through
> that subnet.
While we're at it, this is a quick copy&paste from an MTA mailing
list, targeted at "how to block spammers":
***+++***
A few options that can be done, sender verification can be done.
Create a filter that contains
if (($sender_host_name contains "ppp") or
($sender_host_name contains "dsl") or
($sender_host_name contains "pool") or
($sender_host_name contains "dhcp") or
($sender_host_name contains ".cpe.") or
($sender_host_name contains "interbusiness.it") or
(($sender_host_name contains "cable") and ($sender_host_name does
not contain "bloor.is.net.cable.rogers.com"))) then
[ Note Rogers.com uses cable within their sending mail server ]
Lastly you can create a list of networks to deny from.
***+++***
Blocks based on reverse hostname dial-up clients.
Cheers,
Johannes mailto:[EMAIL PROTECTED]
--
Excuse my english. I went to US public school.
________________________________________________
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