About MailRadar

As a Linux oriented community for sysadmins, MailRadar.com aims to provide unique information and surveys about email messaging and email servers, as well as a range of free tools to help you determine the status of an IP or domain, or the security level of your mail server.
Mail servers facts & figures

Open source vs. commercial mail servers - global distribution

Out of the total number of email servers identified, 71.06% were found to be open source, while the rest of 28.94% are commercial servers. Open source vs. commercial mail servers
Open source mail servers
Commercial mail servers

Open relay vs. secured mail servers - global distribution

Open relay vs. secured mail servers The open relay percentage is 6.65%. A high number of open relays would increase the overall amount of spam received world-wide. 93.35% of the inspected servers are safe from spammer exploitation.
Closed relay mail servers
Open relay mail servers

Blacklisted vs. reliable mail servers - global distribution

The servers are listed in at least one blacklist database have a 49.27% percentage out of the total number of servers scanned. These servers are banned and cannot transmit emails to other servers that rely on blacklists to block spammers. The number of servers not included in any of the blacklist databases is 50.73%. Blacklisted vs. reliable mail servers
Reliable mail servers
Blacklisted mail servers
Latest email related articles

Do not underestimate the bad guys

(Mike Bantick, ITWire) Security firm Sophos has recently produced its 2010 mid-year Security Threat Report, and whilst many things remain the same, there are plenty of new security vectors for the connected among us to deal with.

If there is one thing that is clear from the latest Sophos mid-year security threat report, it is that traditional attacks on private data are still prevalent.  Perhaps the vectors are shifting but figures show Spam, Phishing and Malware are still a major source of worry for security personnel world-wide.

The Security Threat Report shows that the traditional security attacks are migrating to social networks such as Facebook and Twitter.  Since April 2009, moving into 2010 reported Spam attacks reported from social networks increased from 33.4% to 57%, Phishing from 21% to 30% and Malware from 21.2% to 36%.  It is clear that criminal activity is moving into the online worlds increasingly populated by everyday Internet users.
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Rating: 12345

Five tips for avoiding self-inflicted email security breaches

(Chad Perrin, TechRepublic) Email security is about a lot more than just using a good password on your POP or IMAP server. Perhaps the most important part of email security is ensuring you don’t shoot yourself in the foot.

These tips focus on the ways users break their own security rather than on protecting against the predations of malicious security crackers. Security can be violated through careless acts more easily than by outside forces.
1. Turn off automated addressing features
2. Use BCC when sending to multiple recipients
3. Save emails only in a safe place
4. Use private accounts for private emails
5. Double-check the recipient, every time — especially on mailing lists
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Rating: 12345

Sophos booklet helpful in corporate security awareness

(M.E.Kabay, NetworkWorld) The recently-released free Sophos booklet, "10 myths of safe web browsing", is a simple, short summary of some basic Web safety information that can serve our purposes in raising security consciousness and involvement.

Each of the following myths is discussed in a short paragraph:
- Myth No.1: The Web is safe because I've never been infected by malware
- Myth No.2: My users aren't wasting time surfing inappropriate content
- Myth No.3: We control Web usage and our users can't get around our policy
[...]
This booklet would make a perfect subject for a brown-bag lunchtime discussion among the IT staff; it could be used as the basis for a user-education session to spark discussion of the issues.

Read more by following the full article link.
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Rating: 12345
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DNS Tools
Get IP status, owner and location, obtain its corresponding hostname or check specific ports.
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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)