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links - spam
There is no easy fix for the problem of spam.
There is no, and there can be no, universally accepted definition
of what constitutes spam. For this reason, any attempt to globally
block all incoming spam is bound to fail because it leads to
false positives — you don't get legitimate mail
because it is wrongly classified as spam.
Many webmail programs such as gmail and yahoo
have tools to filter out spam for you and put it
in a separate folder.
For those who use other mail clients, there are programs like
spamassassin and pine's filter to filter out the spam.
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E-mail spam at Wikipedia
"E-mail spam is a subset of spam that involves sending nearly identical messages to thousands (or millions) of recipients by E-mail." All about spam, clearly explained: Statistics, Legality, Avoiding spam, How spammers operate, Related info.
Spam at TechTarget
"Spam is unsolicited e-mail on the Internet. (E-mail that is wanted is sometimes referred to as ham.) From the sender's point-of-view, spam is a form of bulk mail, often sent to a list obtained from a spambot or to a list obtained by companies that specialize in creating e-mail distribution lists. To the receiver, it usually seems like junk e-mail."
: Jan 2005
Server-side app to request delivery confirmation for mail. Processes incoming mail messages, and conditionally requests a delivery confirmation from the sender, based on user's
.qmail file. Spam doesn't reply to the confirmation, so you don't see the spam.
"Spamhaus tracks the Internet's Spammers, Spam Gangs and Spam Services, provides dependable realtime anti-spam protection for Internet networks, and works with Law Enforcement to identify and pursue spammers worldwide."
SPF (Sender Policy Framework)
On the other hand, it seems that a lot of people (almost 20,000 domains) are using SPF (Sender Policy Framework) records on DNS to confirm that the sender MTA is official for a domain (by now are used only for testing purposes)."
SPF is a good solution, but it's still only a band-aid until everyone uses it. You'll just see spammers start forging from obscure, poorly-maintained domains. I'd rather force the spammers to properly implement SMTP than simply scurry under a different rock.
Basically, we're doing something that I've been on the wrong side of more than a few times: we're restricting access to our services to "legitimate" use only. We know what assumptions we can make, so now we need to find a way to make it the hardest we can for the "enemy" to keep up. SPF is a pretty shallow slope to climb, but properly implementing temporary failure handling is non-trivial.
: Feb 2007
filtering - alpine
filtering - spamassassin
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