If in saying "filters" you mean, delivers it to a folder along with
hoards of other junk for some poor admin to check to ensure there is no
legitimate mail in the pile... Yep.
I don't find this a great task though. A quick sort by subject, or
sender and you quickly wipe out all the crap, leaving a handful of
legitimate emails to let through. This might be a painful task for
larger sites such as Massey or an ISP.
Cheers,
Richard.
-----Original Message-----
From: Steve Withers [mailto:swithers(a)mmp.org.nz]
Sent: Friday, 26 September 2003 10:39 a.m.
To: NZ NOG
Subject: [nznog] IP / domain blocking for SPAM prevention
Further comments on IP and domain blocking for *personal* mail servers:
Just checked my maillog from yesterday.
70% of rejected mail connects came from hotmail, yahoo, earthlink and
aol.
30% came from the 61.* and 218.* Korean IP spaces
10% was rejected by ordb / relay denied / other blocked domains
I have wondered if ISPs want to encourage customers to set up
individually customisable mailservers on broadband connections - some
sort of appliance - that acts as their mail server.
Let the business and competent private users decide what they will and
won't receive....with benefits to the ISP in terms of reduced bandwidth
consumed as spam isn't deliverable to these people. Just lots of
rejected connect attempts. This may even be a managed service an ISP
could offer a customer / business. If payment is on data-volume, this
could help reduce such charges - offsetting any service fee to some
extent.
Am I right in thinking Mailmarshall still allows the spam to be
delivered? It just filters it.
The method above prevents delivery.
It would be impossible to do this at ISP level....but it may be a
service line an ISP might like to offer a client who wants to define
what they do and do not receive.
--
Steve Withers