You are in: Articles / Security / Antispam / Spam countermeasures and blocking mechanisms

Spam countermeasures and blocking mechanisms

In today's Internet environment, the spam issue cannot be eliminated 100%. It is a new problem, for which no conventional solutions have yet been designed. To address this increasing issue, many solutions for the stages before and after accepting mail messages were designed, to ensure most of the spam messages do not get to reach users’ mailboxes.

This article will focus on the most relevant ones, with a high degree of usability.

There are several methods that can be used to make a gross selection of the incoming messages; out of them, we can separate two principles of spam filtering. We will thus focus on the available mechanisms and methods, and consider pre-accepting a message filtering as the gross filter, and post accepting the message as the fine filter.

Gross filtering usually consists in checks that the connection complies with certain conditions before it is accepted by the server; also note that this type of filtering may not exist at all in some mail servers, depending on their configuration and implementation. Another aspect that needs to be taken into consideration is that, in certain configurations, these checks may not be made by the actual SMTP server, but by third party utilities and tools, or by intermediary tools that intercept or mitigate the communication between your server and the connecting host.
Rating: 12345
Page 1 of 3
Leave a comment

Note: all fields marked with (*) are required
Comments (0)
Close send to email window

Verification code

Already a member?
Blacklist monitoring alerts
sign up Signup for our real-time monitoring service and receive email notifications each time one of your IPs gets blacklisted.
Free Signup
Mail Server Operating System Poll

What OS do you use for your email server?
disabled next

How many mailboxes do you currently manage?
previous next

Would you like to comment upon the choosing of this particular OS?

DNS Tools
Get IP status, owner and location, obtain its corresponding hostname or check specific ports.
Ping Statistics
Reverse DNS Lookup
Whois Info (IP owner)
GeoIP Information
Check Port
Open Relay Test
Test if your mail server is an open relay for spammers.
Blacklist Checker
Check if your IP is listed in DNS based email blacklists (DNSBL)