Spam Filtering

Read the Frequently Asked Questions (FAQs) page if you are new.

• Spam Filtering Implementations
• Spam Filtering Resources
• Spam Filter Listings

Spam Filtering Implementations

Sever side software is useful for those who operate a mail server, client side for email end-users and recipients. Challenge/Response is a way to automatically whitelist new senders - most current implementations are poorly thought through. Be very careful before choosing to use Challenge/Response as a spam filter.

Client Side (User) Filters

Server Side Filters

Challenge/Response Filters

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Spam Filtering Resources

Filtering FAQs

Spam Archives

Bounces

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Spam Filter Listings

DNS Blackhole Lists (DNSBLs) provide a database which can be queried by DNS, which is useful primarily for server side applications but are now being utilised in client side implementations. Blacklists offer much the same service but are used as single-line text records for input into a mail program.

DNS Blackhole Lists

Blacklists

Anti Server Filtering

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