Unix/Linux (client-side) anti-spam software:
- MailArmor is a Java package and works as a gateway between your mail client and the mail server.
- Mailfilter "is a flexible utility for UNIX (-like) operating systems to get rid of unwanted spam mails, before having to go through the trouble of downloading them into the local computer. It offers support for one or many POP3 accounts and is especially useful for dialup connections via modem, ISDN, etc."
- mapSoN for Unix/Linux by Peter Simons gives you a whiteboard. Unknown senders (unless they are replying to a message you sent or a news post of yours) have their messages held and receive a message asking them to confirm. Until confirmation is sent, the message is not delivered. You can then have a cron process delete the old items in the spool every so often. Since spammers usually use a phony return address, the message asking them to confirm never gets through, so their message sits in the spool until being deleted.
- popsneaker "is a mailfilter for remote filtering of POP3 email accounts. It is mostly useful for computers which have a dial-in connection to the internet. You can define rules to select emails, which you don't want to download to your local box. This is a simple and effective way to get rid of spam, advertisings and other kinds of unwanted mail. The filter rules are very flexible and powerful, but still easy to handle. The main ruletypes are using regular expressions to deny, to accept or to make an assumption on the mail."
- Scanmail is antivirus antispam software for Unix that works with sendmail.
- The Spam Bouncer by Catherine A. Hampton " is a set of procmail recipes, or instructions, which search the headers and text of your incoming email to see if it meets one or more of [various] conditions... The SpamBouncer sorts suspected spam into two categories -- mail from known spam sources which is definitely spam, and other mail which is probably spam, but might also be legitimate. It then tags this email with appropriate headers giving the spam classification, and responds according to the parameters you have set."
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