| dnsbl.net.au | Helping you block invalid E-mail |
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Similar to the hostname based, RHS syntax dnsbl.net.au Dynamic Domain Names, but this one contains IP numbers only.
Consists of collection of IP addressed networks, which are normally assigned dynamically (never the same ip number again, when you log back on again.)
Well, those sorts of servers or end user clients are supposed to be using their service providers mail server for outgoing email.
But, of course, those are easy to block by those people who don't want to receive spam.
Also, many service providers can limit and monitor the type, quantity and frequency of email going outwards from each clients session, and enforce their own AUP. If their client goes berserk, and spews out spam, then the ISP has a record of the event, date, times, and to and from details, in their logs, which can be used in a court.
Also, many ISP's are now enforcing their 'you may not forge' policies, to prevent their clients from forging their return or reply addresses.
So to avoid all those pesky rules imposed by ISP's to stop spam be sent out from their netowrk's, the spammer sets up their own mailserver, logs in on either the dialup or dsl connection, and spams away directly, without going near their ISP's outgoing mail server.
There are recommended routing methods which ISP's can use to block port 25 traffic, to and/or from the ISP's dialup or dsl networks. While many are doing this, many are not.
Also, another problem which came to light in 2001, was the vast quantity of direct delivered viruses, which are normally sent directly from the infected client, without going out via their respective service provider SMTP or outgoing mail server.
Many other ISP's around the world are now rejecting any and all email delivery attempts, if they originate from a network which is either a dialup or dsl type service.
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| dnsbl.net.au |
abuse [at] dnsbl [dot] net [dot] au
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