It’s like the system that is used by Wordpress plugins like Spam Karma or Akismet. They have their own spam filters that filter out spam but also access blacklists and whitelists on the Internet that are created by a lot of users.

Bullgard Spamfilter integrates with Microsoft Outlook, Outlook Express and Thunderbird and requires a user account at Bullguard which can be created during setup (just enter a email address and password). A huge advantage over tools like Spamihilator is the fact that you do not need to change the account settings, e.g. the mailserver, in the email client that you are using, it works right out of the box.

One aspect that I personally do not like is that Bullguard adds a footer message to all mails that are send from your account, saying:

I use BullGuard Spamfilter to keep my inbox clean.
It is completely free: www.bullguard.com/freespamfilter

This can’t be unchecked in this version and is definitely a reason for me personally not to use it.

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Some plugins add specialized spam filters which is a great way of keeping spam messages from reaching your inbox. Other add statistics for instance that give you a better overview of the spam that has been captured so far. I’m not using Spamihilator anymore because I made the switch to Thunderbird which fights spam automatically.

A Blacklist Filter – This plugin checks mail messages against public blacklists.
Attachment Extensions Filter – Ability to block mails with attachments that have certain file extensions automatically
HTML Links Filter – blocks mails that contain to many links or urls
Misnamed filter – Blocks mail that is addressed to another name. So, mail saying Hello Robert will be moved to spam if your name is not Robert.
Mystic Signs Filter – Filters out mails that try to obscure words by integrating special chars into them.

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I searched desperately for a good anti spam software and tried many. Most did not work to well in reducing spam, some worked to well and even stopped my normal mail from arriving. Then, finally after a long evaluation time I found the spam software that I´am still using today. It reduced my daily spam dosis of 500 to 4 in just two days.

Spamihilator “sits” between your mail client and the pop3 server analysing every mail that arrives. If the program thinks a mail is actually spam it moves it to the trashcan and the training area. I suggest everyone takes a daily look into the trashcan just in case something gets missing the first days. You can also put emails on a whitelist which means emails from the sender of the whitelist will never be seen as spam and thus always arrive.

If there is a whitelist there’s also a blacklist, you can enter emails that are always seen as spam and therefor automatically moved to the trashcan.

The training area helps to increase distinguishing chance of the spam software, you can select every mail and declare it as spam or not. Mailihilator then learns from these.

The amount of spam mails I received remained steady the same, but the amount that arrived at my mailbox was reduced by an astonishing 98% after just two days of using the spam program.

Spamihilator already has some good spam checking algorithm which gets better by using the training area but there are also lots of plugins which mostly serve a special spam type. Lets take a look at the most importanr plugins.

Addressee Filter: Quickly filters out mails that are not addressed To or Cc’d to one of your correct email addresses.

AlphabetSoup Filter 1.0: This plugin filters emails containing useless chains of characters.

Empty Mail Filter v1.0.2 : This filter blocks e-mails that are empty or contain very few words.

No Comment! Filter v1.0.0: This filter blocks e-mails that contain HTML comments. Spammers sometimes use HTML comments.

RFC-Validator 1.2.0: Filters mails that are not RFC conform or malicious

Scripts Filter v1.0.2: This filter blocks e-mails that contain embedded HTML scripts.

S_P_A_C_E Filter: Eliminates e-mails containing spaced-out words like `v 1.a g-r a` or `v.i c.0~d.i_n`.

There are lots more, all can be downloaded from the Mailinator homepage.

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