spam filtering services

Spam Filtering Services

Spam filtering services offered by many retail isps, commercial online spam-filtering services (such as spamcop), mda-based procmail scripts, or packages like spamassassin, are all examples of on-network filtering.
White hat: good anti-spam policies.
Black hat: pro-spam policies.
The definition widely used in electronic messaging and email defines spam as a disruptive, commercial message that is unsolicited and usually sent indiscriminately.
These protocols don't come up very often in the study of spam, because they do not figure in the propagation of spam.
Do a search for anti spam software or spam blocker reviews and you'll find a lot of choices.
Spamarrest or similar spam blockers are typically used for personal use.
Spamarrest works by questioning unknown senders with its innovative challenge/response function.
This helps filter out spammers, who haven't gotten around to automating this response.
Senders only have to be authenticated once by spamarrest, before being added to the safe list.
Spamarrest is compatible with most or even all types of email applications, including web based emails.
Spam, Bulk Email: Spam originally meant to post many off-topic and inappropriate postings to a newsgroup(s), making it hard to read by lowering the signal to noise ratio.