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	741,799	100.0%
Number of Servers that didn't respond	122,014	16.45%
Server didn't open socket	120,510	16.25%
Server didn't provide banner	1,504	0.20%
Server provided banner	619,785	83.55%
Server banner identifies software in use	401,308	54.10%

As indicated by the above table, of the 741,799 servers queried, only 401,308 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	227,172	56.61%
Postfix	147,735	36.81%
Sendmail	14,456	3.60%
MailEnable	7,318	1.82%
MDaemon	1,616	0.40%
Microsoft	781	0.19%
CommuniGate Pro	496	0.12%
OpenSMTPD	351	0.09%
XMail	278	0.07%
IMail	242	0.06%
SurgeSMTP	225	0.06%
Qmail Toaster	124	0.03%
WinWebMail	110	0.03%
MagicMail	103	0.03%
Lotus Domino	83	0.02%
Merak	50	0.01%
Post.Office	50	0.01%
Kerio	42	0.01%
ArGoSoft	29	0.01%
GroupWise	17	0.00%
Gordano Messaging Suite (GMS)	7	0.00%
OpenVMS	5	0.00%
Trend Micro	5	0.00%
ModusMail	4	0.00%
InterScan VirusWall	3	0.00%
VisNetic	2	0.00%
Mercury	1	0.00%
MessageWall	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (227,172 servers)
Version	Number of Servers	Percent
4.96.2	164,971	72.62%
4.96	12,776	5.62%
4.95	8,198	3.61%
4.97.1	6,707	2.95%
4.93	6,509	2.87%
4.96.1	6,082	2.68%
4.94.2	5,186	2.28%
4.92	2,847	1.25%
Other	13,896	6.12%
Postfix (147,735 servers)
Version	Number of Servers	Percent
Other	147,735	100.00%
Sendmail (14,456 servers)
Version	Number of Servers	Percent
8.16.1	4,940	34.17%
8.15.2	4,247	29.38%
8.14.7	1,296	8.97%
8.14.4	1,227	8.49%
8.13.8	595	4.12%
8.14.5	507	3.51%
8.17.1	327	2.26%
8.14.9	237	1.64%
8.17.2	207	1.43%
8.13.1	164	1.13%
Other	709	4.90%
MailEnable (7,318 servers)
Version	Number of Servers	Percent
10.46--	3,014	41.19%
10.34--	350	4.78%
10.43--	301	4.11%
10.47--	259	3.54%
10.27--	219	2.99%
10.47--10.47	205	2.80%
10.25--	178	2.43%
10.47-10.47-	161	2.20%
10.43-10.43-	147	2.01%
10.42--	123	1.68%
9.00--	84	1.15%
9.00--9.00	82	1.12%
Other	2,195	29.99%
MDaemon (1,616 servers)
Version	Number of Servers	Percent
23.5.1	189	11.70%
23.5.2	87	5.38%
19.5.4	79	4.89%
23.0.2	76	4.70%
13.5.1	72	4.46%
13.0.5	60	3.71%
23.5.0	60	3.71%
11.0.0	55	3.40%
11.0.3	51	3.16%
13.0.4	50	3.09%
23.0.1	45	2.78%
21.5.4	40	2.48%
14.5.2	37	2.29%
16.5.2	37	2.29%
21.5.2	31	1.92%
12.5.6	27	1.67%
22.0.3	24	1.49%
19.5.5	20	1.24%
Other	576	35.64%
Microsoft (781 servers)
Version	Number of Servers	Percent
6.0.3790.4675	195	24.97%
10.0.17763.1697	128	16.39%
8.5.9600.16384	101	12.93%
10.0.14393.4169	95	12.16%
7.5.7601.17514	57	7.30%
6.0.3790.3959	38	4.87%
5.0.2195.5329	38	4.87%
8.0.9200.16384	21	2.69%
5.0.2195.6713	13	1.66%
10.0.20348.1	11	1.41%
5.0.2195.7381	10	1.28%
Other	74	9.48%
CommuniGate Pro (496 servers)
Version	Number of Servers	Percent
6.2.15	52	10.48%
6.2.14	47	9.48%
6.4.1	21	4.23%
6.4.0	21	4.23%
6.3.17	20	4.03%
6.3.18	18	3.63%
6.1.20	17	3.43%
6.3.20	14	2.82%
5.4.11	10	2.02%
6.3.19	10	2.02%
6.1.16	9	1.81%
5.1.16	9	1.81%
6.3.14	8	1.61%
7.1.6	8	1.61%
6.0.11	8	1.61%
6.2.12	7	1.41%
5.2.20	7	1.41%
6.1.18	7	1.41%
6.0.9	6	1.21%
6.3.6	6	1.21%
6.3.15	5	1.01%
5.2.3	5	1.01%
5.1.7	5	1.01%
6.3.13	5	1.01%
Other	171	34.48%
OpenSMTPD (351 servers)
Version	Number of Servers	Percent
Other	351	100.00%
XMail (278 servers)
Version	Number of Servers	Percent
1.27	184	66.19%
1.22	67	24.10%
1.25	8	2.88%
1.26	7	2.52%
1.15	4	1.44%
1.24	3	1.08%
Other	5	1.80%
IMail (242 servers)
Version	Number of Servers	Percent
12.6.1.4	33	13.64%
12.5.8.41	19	7.85%
12.5.6.101	17	7.02%
9.23	16	6.61%
12.5.8.59	16	6.61%
12.5.6.105	15	6.20%
12.5.7.59	11	4.55%
12.5.3.93	11	4.55%
8.22	10	4.13%
12.5.8.58	10	4.13%
8.05	8	3.31%
12.4.1.15	6	2.48%
12.3.0.100	6	2.48%
12.6.0.17	6	2.48%
12.5.4.146	5	2.07%
7.07	5	2.07%
12.5.5.115	5	2.07%
8.15	5	2.07%
12.5.8.54	4	1.65%
10.02	4	1.65%
11.5	4	1.65%
12.6.0.20	3	1.24%
8.00	3	1.24%
Other	20	8.26%
SurgeSMTP (225 servers)
Version	Number of Servers	Percent
7.7c-1	30	13.33%
7.7i-1	30	13.33%
7.3e2-2	15	6.67%
7.6j-1	15	6.67%
7.3o4-4	13	5.78%
7.5c-1	9	4.00%
7.5a-1	7	3.11%
7.1e-1	7	3.11%
7.4o-1	7	3.11%
6.9c-1	7	3.11%
7.6u-1	6	2.67%
7.6h-2	5	2.22%
7.7h-3	5	2.22%
7.7g-1	5	2.22%
7.4e-1	5	2.22%
7.7m-1	4	1.78%
7.2i-1	4	1.78%
7.6s-1	4	1.78%
6.5a2-2	4	1.78%
6.7c-1	4	1.78%
7.6d-1	4	1.78%
6.5a-1	3	1.33%
7.8a-1	3	1.33%
7.7j-1	3	1.33%
Other	26	11.56%
Qmail Toaster (124 servers)
Version	Number of Servers	Percent
1.03	70	56.45%
1.3	51	41.13%
1.03.5	2	1.61%
Other	1	0.81%
WinWebMail (110 servers)
Version	Number of Servers	Percent
4.4.0.1	18	16.36%
4.2.0.1	14	12.73%
3.9.0.7	13	11.82%
4.5.0.1	12	10.91%
3.8.1.3	10	9.09%
3.8.0.1	6	5.45%
4.3.0.1	4	3.64%
3.7.7.3	3	2.73%
3.9.2.1	3	2.73%
3.7.3.1	3	2.73%
4.1.0.1	3	2.73%
3.7.6.1	2	1.82%
3.8.1.5	2	1.82%
3.8.6.1	2	1.82%
3.8.5.1	2	1.82%
4.0.0.1	2	1.82%
3.9.0.3	2	1.82%
Other	9	8.18%
MagicMail (103 servers)
Version	Number of Servers	Percent
Other	103	100.00%
Lotus Domino (83 servers)
Version	Number of Servers	Percent
8.5.3	15	18.07%
8.5.3FP6	10	12.05%
7.0	6	7.23%
7.0.3	5	6.02%
8.0.1	4	4.82%
7.0.2	4	4.82%
6.5	3	3.61%
6.5.3	3	3.61%
8.5.1	3	3.61%
8.5.2FP1	2	2.41%
8.5.3FP1	2	2.41%
8.0	2	2.41%
6.5.1	2	2.41%
8.5.2FP2	2	2.41%
8.5.2	2	2.41%
8.5.1FP5	2	2.41%
8.5.3FP2	1	1.20%
8.5	1	1.20%
8.5.3FP6HF1215	1	1.20%
6.0.1	1	1.20%
5.0.13a	1	1.20%
8.5.2FP4	1	1.20%
5.0.8	1	1.20%
8.5.3FP5	1	1.20%
7.0.4FP1	1	1.20%
7.0.4FP2	1	1.20%
8.5.1FP3	1	1.20%
6.6.6	1	1.20%
6.5.2	1	1.20%
8.5.1FP2	1	1.20%
6.5.1IF1	1	1.20%
8.5.3FP3	1	1.20%
Other	0	0.00%
Merak (50 servers)
Version	Number of Servers	Percent
8.9.1	12	24.00%
8.0.3	12	24.00%
7.6.1	7	14.00%
8.3.8	5	10.00%
7.4.5	2	4.00%
8.0.1	1	2.00%
8.9.2	1	2.00%
8.3.6	1	2.00%
6.1.0	1	2.00%
9.0.3	1	2.00%
7.5.2	1	2.00%
4.2.1	1	2.00%
7.6.0	1	2.00%
7.4.4	1	2.00%
6.0.8	1	2.00%
7.0.1	1	2.00%
5.8.2	1	2.00%
Other	0	0.00%
Post.Office (50 servers)
Version	Number of Servers	Percent
4.4	27	54.00%
4.2.2	7	14.00%
3.5.3	5	10.00%
4.3	4	8.00%
3.9.2	2	4.00%
4.1.2.4	2	4.00%
4.0.1	1	2.00%
3.1.2	1	2.00%
4.2.1.1	1	2.00%
Other	0	0.00%
Kerio (42 servers)
Version	Number of Servers	Percent
6.7.3	9	21.43%
6.7.1	5	11.90%
6.6.1	5	11.90%
6.7.0	5	11.90%
6.6.2	4	9.52%
6.5.2	3	7.14%
5.7.9	2	4.76%
6.7.2	2	4.76%
6.4.1	1	2.38%
5.7.6	1	2.38%
6.0.8	1	2.38%
6.5.0	1	2.38%
6.5.1	1	2.38%
6.6.0	1	2.38%
6.3.0	1	2.38%
Other	0	0.00%
ArGoSoft (29 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	10	34.48%
1.8 (1.8.9.3)	5	17.24%
1.8 (1.8.9.5)	4	13.79%
1.8 (1.8.6.1)	1	3.45%
1.8 (1.8.7.3)	1	3.45%
1.8 (1.8.8.4)	1	3.45%
1.8 (1.8.8.8)	1	3.45%
1.8 (1.8.1.7)	1	3.45%
1.8 (1.8.6.0)	1	3.45%
1.8 (1.8.8.7)	1	3.45%
1.8 (1.8.9.1)	1	3.45%
1.8 (1.8.9.4)	1	3.45%
1.8 (1.8.9.2)	1	3.45%
Other	0	0.00%
GroupWise (17 servers)
Version	Number of Servers	Percent
18.5.0	3	17.65%
18.1.1	2	11.76%
18.2.1	2	11.76%
18.3.1	2	11.76%
14.2.1	1	5.88%
14.2.3	1	5.88%
18.0.0	1	5.88%
18.4.1	1	5.88%
23.4.0	1	5.88%
18.4.2	1	5.88%
14.2.2	1	5.88%
18.0.2	1	5.88%
Other	0	0.00%
Gordano Messaging Suite (GMS) (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%
OpenVMS (5 servers)
Version	Number of Servers	Percent
8.4	3	60.00%
7.3	1	20.00%
8.2	1	20.00%
Other	0	0.00%
Trend Micro (5 servers)
Version	Number of Servers	Percent
5.18	3	60.00%
5.7	1	20.00%
5.5	1	20.00%
Other	0	0.00%
ModusMail (4 servers)
Version	Number of Servers	Percent
4.1.361.21	4	100.00%
Other	0	0.00%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
VisNetic (2 servers)
Version	Number of Servers	Percent
8.0.3	1	50.00%
9.3.2.0	1	50.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	100.00%
Other	0	0.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	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%