Report Description

This report is a comprehensive report involving all mail servers we know of visible on the internet. For each domain in our conventional web server survey, we also determine the list of mail servers that provide inbound mail services (via MX record lookups). Each unique mail server is connected to once each month, where we wait for the server's "220 " message which usually accompanies a banner revealing the server software being used.

Basic Response Statistics

When connecting to an MX server, a number of different responses are possible. The remote server may not be up and running or completely refusing connections, it may not respond back with a "220 " line in the amount of time we wait, nor will it always provide a banner that identifies the type of software running.

Description>	Number of Servers	Percent
Total Number of MX Servers Queried	672,561	100.0%
Number of Servers that didn't respond	106,122	15.78%
Server didn't open socket	104,747	15.57%
Server didn't provide banner	1,375	0.20%
Server provided banner	566,439	84.22%
Server banner identifies software in use	379,795	56.47%

As indicated by the above table, of the 672,561 servers queried, only 379,795 servers responded with a banner that allow us to identify the software being used. All of the remaining information in this report is based on the responses that allowed us to identify the software in use.

Basic Technology Breakdown

Server Type	Number of Servers	Percent
Exim	225,619	59.41%
Postfix	130,211	34.28%
Sendmail	13,179	3.47%
MailEnable	6,943	1.83%
MDaemon	1,373	0.36%
Microsoft	626	0.16%
CommuniGate Pro	442	0.12%
XMail	253	0.07%
OpenSMTPD	232	0.06%
IMail	217	0.06%
SurgeSMTP	192	0.05%
Qmail Toaster	124	0.03%
MagicMail	98	0.03%
Lotus Domino	67	0.02%
WinWebMail	45	0.01%
Merak	41	0.01%
Kerio	40	0.01%
Post.Office	36	0.01%
ArGoSoft	24	0.01%
GroupWise	15	0.00%
OpenVMS	4	0.00%
Gordano Messaging Suite (GMS)	3	0.00%
VisNetic	3	0.00%
ModusMail	2	0.00%
Trend Micro	2	0.00%
Mercury	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (225,619 servers)
Version	Number of Servers	Percent
4.96.2	165,657	73.42%
4.96	11,474	5.09%
4.97.1	8,716	3.86%
4.95	7,989	3.54%
4.93	6,228	2.76%
4.96.1	5,587	2.48%
4.94.2	4,773	2.12%
4.92	2,650	1.17%
Other	12,545	5.56%
Postfix (130,211 servers)
Version	Number of Servers	Percent
Other	130,211	100.00%
Sendmail (13,179 servers)
Version	Number of Servers	Percent
8.16.1	5,108	38.76%
8.15.2	3,656	27.74%
8.14.7	1,202	9.12%
8.14.4	1,011	7.67%
8.13.8	516	3.92%
8.14.5	294	2.23%
8.17.1	263	2.00%
8.14.9	195	1.48%
8.13.1	163	1.24%
8.17.2	152	1.15%
Other	619	4.70%
MailEnable (6,943 servers)
Version	Number of Servers	Percent
10.46--	2,992	43.09%
10.34--	345	4.97%
10.43--	262	3.77%
10.47--	207	2.98%
10.27--	206	2.97%
10.25--	174	2.51%
10.47--10.47	140	2.02%
10.43-10.43-	121	1.74%
10.42--	119	1.71%
10.48--	106	1.53%
10.47-10.47-	104	1.50%
9.00--	86	1.24%
9.00--9.00	81	1.17%
10.48--10.48	74	1.07%
Other	1,926	27.74%
MDaemon (1,373 servers)
Version	Number of Servers	Percent
23.5.2	101	7.36%
23.5.3	99	7.21%
23.5.1	78	5.68%
13.5.1	67	4.88%
13.0.5	54	3.93%
13.0.4	50	3.64%
11.0.0	50	3.64%
21.5.4	45	3.28%
23.5.0	42	3.06%
11.0.3	41	2.99%
19.5.4	38	2.77%
23.0.2	35	2.55%
16.5.2	33	2.40%
14.5.2	30	2.18%
23.0.1	30	2.18%
12.5.6	27	1.97%
21.5.2	26	1.89%
22.0.3	23	1.68%
19.5.5	18	1.31%
Other	486	35.40%
Microsoft (626 servers)
Version	Number of Servers	Percent
6.0.3790.4675	163	26.04%
10.0.17763.1697	103	16.45%
10.0.14393.4169	78	12.46%
8.5.9600.16384	72	11.50%
7.5.7601.17514	48	7.67%
6.0.3790.3959	37	5.91%
5.0.2195.5329	27	4.31%
10.0.20348.1	16	2.56%
8.0.9200.16384	13	2.08%
5.0.2195.6713	12	1.92%
10.0.17763.1	9	1.44%
Other	48	7.67%
CommuniGate Pro (442 servers)
Version	Number of Servers	Percent
6.2.15	47	10.63%
6.2.14	36	8.14%
6.3.17	19	4.30%
6.4.1	19	4.30%
6.3.18	17	3.85%
6.3.20	17	3.85%
6.4.0	13	2.94%
6.1.20	13	2.94%
6.3.19	12	2.71%
6.0.9	9	2.04%
6.1.16	9	2.04%
6.3.6	8	1.81%
5.4.11	7	1.58%
7.1.6	7	1.58%
6.0.11	7	1.58%
5.1.16	7	1.58%
6.1.18	7	1.58%
6.3.14	6	1.36%
5.1.7	6	1.36%
5.2.20	5	1.13%
6.3.15	5	1.13%
6.3.13	5	1.13%
6.1.19	5	1.13%
Other	156	35.29%
XMail (253 servers)
Version	Number of Servers	Percent
1.27	167	66.01%
1.22	56	22.13%
1.26	9	3.56%
1.25	9	3.56%
1.15	3	1.19%
Other	9	3.56%
OpenSMTPD (232 servers)
Version	Number of Servers	Percent
Other	232	100.00%
IMail (217 servers)
Version	Number of Servers	Percent
12.6.1.4	28	12.90%
12.5.6.101	15	6.91%
12.5.8.41	14	6.45%
9.23	13	5.99%
12.5.8.59	13	5.99%
12.5.7.59	12	5.53%
12.5.3.93	12	5.53%
12.5.8.58	11	5.07%
12.5.6.105	11	5.07%
8.05	8	3.69%
12.4.1.15	8	3.69%
8.22	7	3.23%
7.07	5	2.30%
12.5.5.115	5	2.30%
12.3.0.100	5	2.30%
8.15	5	2.30%
12.6.0.17	5	2.30%
11.5	5	2.30%
12.5.4.146	4	1.84%
12.6.0.20	4	1.84%
8.00	4	1.84%
12.5.8.54	3	1.38%
6.04	3	1.38%
10.02	3	1.38%
12.5.5.117	3	1.38%
Other	11	5.07%
SurgeSMTP (192 servers)
Version	Number of Servers	Percent
7.8a-1	17	8.85%
7.7c-1	16	8.33%
7.3o4-4	16	8.33%
7.7i-1	15	7.81%
7.3e2-2	13	6.77%
7.6j-1	11	5.73%
7.5c-1	9	4.69%
6.9c-1	7	3.65%
7.5a-1	6	3.12%
7.4o-1	6	3.12%
7.1e-1	6	3.12%
7.6u-1	6	3.12%
6.5a2-2	6	3.12%
7.7g-1	5	2.60%
7.4e-1	5	2.60%
7.6s-1	4	2.08%
7.8b-2	4	2.08%
6.7c-1	4	2.08%
7.7h-3	3	1.56%
7.6h-2	3	1.56%
7.3i2-2	2	1.04%
7.7m-1	2	1.04%
7.7b-3	2	1.04%
7.3c3-3	2	1.04%
7.8b-4	2	1.04%
7.7l-3	2	1.04%
3.9e-1	2	1.04%
6.8g-1	2	1.04%
7.6d-1	2	1.04%
Other	12	6.25%
Qmail Toaster (124 servers)
Version	Number of Servers	Percent
1.03	68	54.84%
1.3	52	41.94%
1.03.5	2	1.61%
Other	2	1.61%
MagicMail (98 servers)
Version	Number of Servers	Percent
Other	98	100.00%
Lotus Domino (67 servers)
Version	Number of Servers	Percent
8.5.3	13	19.40%
8.5.3FP6	9	13.43%
7.0	5	7.46%
6.5	3	4.48%
7.0.3	3	4.48%
8.5.1	3	4.48%
8.5.2FP1	2	2.99%
8.5	2	2.99%
6.5.1	2	2.99%
8.5.2FP2	2	2.99%
8.5.3FP3	2	2.99%
8.0.1	2	2.99%
6.5.3	2	2.99%
7.0.2	2	2.99%
8.5.3FP2	1	1.49%
8.5.3FP6HF1215	1	1.49%
6.0.1	1	1.49%
5.0.13a	1	1.49%
8.5.2	1	1.49%
5.0.8	1	1.49%
8.5.3FP5	1	1.49%
7.0.4FP1	1	1.49%
8.0	1	1.49%
7.0.4FP2	1	1.49%
6.6.6	1	1.49%
6.5.2	1	1.49%
7.0.3FP1	1	1.49%
5.0.13	1	1.49%
8.5.3FP1	1	1.49%
Other	0	0.00%
WinWebMail (45 servers)
Version	Number of Servers	Percent
4.2.0.1	9	20.00%
4.4.0.1	7	15.56%
4.5.0.1	6	13.33%
3.9.0.7	5	11.11%
4.0.0.1	3	6.67%
3.8.1.3	3	6.67%
3.8.0.1	2	4.44%
3.7.3.1	2	4.44%
1.0	1	2.22%
3.8.5.1	1	2.22%
3.9.3.1	1	2.22%
3.8.6.1	1	2.22%
3.9.2.1	1	2.22%
3.9.0.1	1	2.22%
4.3.0.1	1	2.22%
4.1.0.1	1	2.22%
Other	0	0.00%
Merak (41 servers)
Version	Number of Servers	Percent
8.9.1	10	24.39%
8.0.3	9	21.95%
7.6.1	7	17.07%
8.3.8	3	7.32%
8.0.1	1	2.44%
8.9.2	1	2.44%
8.3.6	1	2.44%
6.1.0	1	2.44%
7.4.5	1	2.44%
9.0.3	1	2.44%
8.5.0	1	2.44%
7.6.0	1	2.44%
7.4.4	1	2.44%
6.0.8	1	2.44%
7.0.1	1	2.44%
5.8.2	1	2.44%
Other	0	0.00%
Kerio (40 servers)
Version	Number of Servers	Percent
6.7.3	9	22.50%
6.6.1	6	15.00%
6.7.0	6	15.00%
6.5.2	4	10.00%
6.7.1	3	7.50%
6.6.2	3	7.50%
5.7.9	2	5.00%
6.5.1	2	5.00%
6.0.10	1	2.50%
6.0.8	1	2.50%
6.7.2	1	2.50%
6.5.0	1	2.50%
6.3.0	1	2.50%
Other	0	0.00%
Post.Office (36 servers)
Version	Number of Servers	Percent
4.4	14	38.89%
4.2.2	8	22.22%
4.3	5	13.89%
3.5.3	3	8.33%
4.1.2.4	2	5.56%
4.2	1	2.78%
3.9.2	1	2.78%
3.1.2	1	2.78%
4.2.1.1	1	2.78%
Other	0	0.00%
ArGoSoft (24 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	6	25.00%
1.8 (1.8.9.3)	3	12.50%
1.8 (1.8.9.5)	3	12.50%
1.8 (1.8.8.8)	2	8.33%
1.8 (1.8.7.3)	2	8.33%
1.8 (1.8.9.2)	2	8.33%
1.8 (1.8.9.1)	2	8.33%
1.8 (1.8.6.1)	1	4.17%
1.8 (1.8.8.4)	1	4.17%
1.8 (1.8.8.7)	1	4.17%
1.8 (1.8.9.4)	1	4.17%
Other	0	0.00%
GroupWise (15 servers)
Version	Number of Servers	Percent
18.2.1	2	13.33%
18.5.0	2	13.33%
14.2.1	1	6.67%
18.1.1	1	6.67%
14.2.3	1	6.67%
18.0.0	1	6.67%
18.4.1	1	6.67%
23.4.0	1	6.67%
14.2.2	1	6.67%
18.2.0	1	6.67%
24.1.0	1	6.67%
18.3.1	1	6.67%
18.0.2	1	6.67%
Other	0	0.00%
OpenVMS (4 servers)
Version	Number of Servers	Percent
7.3	2	50.00%
8.4	1	25.00%
8.2	1	25.00%
Other	0	0.00%
Gordano Messaging Suite (GMS) (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
9.3.2.0	2	66.67%
8.0.3	1	33.33%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Trend Micro (2 servers)
Version	Number of Servers	Percent
5.18	2	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%