Call +91-9444874881 for sales enquiries
Also in Youtube. This video illustrates the famous OpenBSD tarpit.
Also in Youtube. This is the web interface of SpamCheetah.
The web interface will not work in IE and Mozilla Firefox is the preferred browser.
| Approach | Vendors, tools | Pros | Cons |
|---|---|---|---|
| Content scanning | Spamassassin, dspam, Bayesian filtering, CRM114 discriminator | Very popular spam filter | False positives, Very very slow, brings down mail processing speeds. Heavy load on the computer that performs this task. Very error prone too. Requires a lot of maintenance and baby sitting. |
| Plain vanilla greylisting | Available with most MTAs and commercial vendors. Examples include postgrey, qmail and so on. | No false positives. Fairly good catch rate and you can combine this with other tools for content scanning. Also reasonably fast. | Mail slows down by 4 hours or so. Spam catch rate is low as many spammers know how to get around greylisting. |
| OpenBSD greylisting + tarpit + blacklisting (SpamCheetah) | Available in all OpenBSD installations, comes with base. Not found in other BSDs or linux. | Very high spam catch rate. Very fast, requires low resources and requires no manual intervention. Zero false positives. Uses Berkeley db, so very fast and can run on embedded platforms. | There is an initial delay of 4 hours but this happens only the first time. After that mail flows at wire speed. Practically not an issue. |
| A combination of various concoctions | Many commercial vendors like Barracuda and Ironport do this. Even some homebrew solutions by UNIX hackers with open source MTAs and other tools like Spamassassin | Good spam catch rate. Integrated mail solution, big brand names. Customer comfort and popularity. | Very expensive. Often not necessary. False positives are not ruled out. |
Call +91-9444874881 for sales enquiries