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	939,972	100.0%
Number of Servers that didn't respond	147,936	15.74%
Server didn't open socket	145,328	15.46%
Server didn't provide banner	2,608	0.28%
Server provided banner	792,036	84.26%
Server banner identifies software in use	515,231	54.81%

As indicated by the above table, of the 939,972 servers queried, only 515,231 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	303,730	58.95%
Postfix	175,600	34.08%
Sendmail	18,461	3.58%
MailEnable	10,254	1.99%
MDaemon	2,662	0.52%
Microsoft	1,322	0.26%
CommuniGate Pro	651	0.13%
IMail	479	0.09%
Qmail Toaster	435	0.08%
XMail	372	0.07%
OpenSMTPD	311	0.06%
SurgeSMTP	268	0.05%
Lotus Domino	142	0.03%
MagicMail	116	0.02%
WinWebMail	112	0.02%
Kerio	73	0.01%
Merak	73	0.01%
Post.Office	63	0.01%
ArGoSoft	33	0.01%
GroupWise	30	0.01%
Gordano Messaging Suite (GMS)	16	0.00%
Trend Micro	8	0.00%
OpenVMS	7	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Neon Mail Server	1	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
WebSTAR	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 (303,730 servers)
Version	Number of Servers	Percent
4.94.2	232,329	76.49%
4.93	22,541	7.42%
4.95	8,901	2.93%
4.94	6,429	2.12%
4.92	5,818	1.92%
4.91	4,322	1.42%
4.92.3	3,354	1.10%
4.89	3,288	1.08%
Other	16,748	5.51%
Postfix (175,600 servers)
Version	Number of Servers	Percent
Other	175,600	100.00%
Sendmail (18,461 servers)
Version	Number of Servers	Percent
8.15.2	9,947	53.88%
8.14.4	2,301	12.46%
8.14.7	1,954	10.58%
8.13.8	1,085	5.88%
8.14.5	939	5.09%
8.16.1	507	2.75%
8.14.9	359	1.94%
8.13.1	304	1.65%
8.14.3	203	1.10%
Other	862	4.67%
MailEnable (10,254 servers)
Version	Number of Servers	Percent
10.34--	3,901	38.04%
10.27--	755	7.36%
10.25--	557	5.43%
9.00--	272	2.65%
10.37--	232	2.26%
10.31--	178	1.74%
10.31-10.31-	164	1.60%
10.37--10.37	162	1.58%
10.37-10.37-	146	1.42%
9.16--	115	1.12%
10.29--	112	1.09%
9.00--9.00	105	1.02%
Other	3,555	34.67%
MDaemon (2,662 servers)
Version	Number of Servers	Percent
21.5.0	295	11.08%
21.0.3	192	7.21%
13.5.1	179	6.72%
13.0.5	107	4.02%
13.0.4	101	3.79%
11.0.0	94	3.53%
11.0.3	89	3.34%
21.0.2	87	3.27%
19.5.5	86	3.23%
19.5.4	80	3.01%
16.5.2	75	2.82%
21.0.1	68	2.55%
14.5.2	55	2.07%
12.5.6	52	1.95%
20.0.4	43	1.62%
10.0.0	31	1.16%
12.5.4	29	1.09%
10.1.2	27	1.01%
16.0.4	27	1.01%
Other	945	35.50%
Microsoft (1,322 servers)
Version	Number of Servers	Percent
6.0.3790.4675	416	31.47%
8.5.9600.16384	217	16.41%
10.0.14393.4169	134	10.14%
7.5.7601.17514	115	8.70%
10.0.17763.1697	89	6.73%
6.0.3790.3959	72	5.45%
5.0.2195.5329	57	4.31%
8.0.9200.16384	39	2.95%
5.0.2195.6713	24	1.82%
10.0.14393.2608	21	1.59%
7.0.6002.18264	19	1.44%
10.0.17763.1	16	1.21%
6.0.3790.1830	16	1.21%
10.0.14393.0	14	1.06%
Other	73	5.52%
CommuniGate Pro (651 servers)
Version	Number of Servers	Percent
6.2.15	86	13.21%
6.2.14	67	10.29%
6.1.20	28	4.30%
6.2.12	23	3.53%
6.1.16	19	2.92%
5.4.11	17	2.61%
5.2.20	15	2.30%
6.3.6	15	2.30%
6.0.11	13	2.00%
6.1.18	13	2.00%
6.0.9	12	1.84%
6.3.5	11	1.69%
6.2.16	11	1.69%
5.1.16	10	1.54%
6.3.3	9	1.38%
6.3.8	9	1.38%
7.1.1	8	1.23%
6.3.7	8	1.23%
6.2.7	8	1.23%
6.2.10	8	1.23%
5.2.19	7	1.08%
6.1.10	7	1.08%
6.1.19	7	1.08%
6.3.9	7	1.08%
Other	233	35.79%
IMail (479 servers)
Version	Number of Servers	Percent
12.5.8.41	95	19.83%
12.5.7.59	57	11.90%
12.5.6.101	46	9.60%
12.4.1.15	30	6.26%
9.23	26	5.43%
8.22	21	4.38%
12.5.6.105	21	4.38%
12.5.3.93	19	3.97%
12.3.0.100	18	3.76%
8.05	17	3.55%
8.15	17	3.55%
10.02	13	2.71%
12.5.5.115	12	2.51%
12.5.5.117	10	2.09%
12.5.4.146	9	1.88%
11.5	7	1.46%
Other	61	12.73%
Qmail Toaster (435 servers)
Version	Number of Servers	Percent
1.3	323	74.25%
1.03	103	23.68%
1.03.5	6	1.38%
Other	3	0.69%
XMail (372 servers)
Version	Number of Servers	Percent
1.27	201	54.03%
1.22	111	29.84%
1.26	17	4.57%
1.25	17	4.57%
1.24	9	2.42%
1.15	5	1.34%
Other	12	3.23%
OpenSMTPD (311 servers)
Version	Number of Servers	Percent
Other	311	100.00%
SurgeSMTP (268 servers)
Version	Number of Servers	Percent
7.3o4-4	38	14.18%
7.5c-1	30	11.19%
7.6h-2	23	8.58%
7.5a-1	21	7.84%
7.3e2-2	17	6.34%
7.4o-1	15	5.60%
7.6d-1	13	4.85%
7.1e-1	12	4.48%
6.5a2-2	7	2.61%
7.4e-1	7	2.61%
7.3i2-2	5	1.87%
6.9c-1	4	1.49%
7.2i-1	4	1.49%
7.6h-1	4	1.49%
7.2a-1	4	1.49%
3.9e-1	4	1.49%
6.7c-1	4	1.49%
7.4m-1	3	1.12%
6.5a-1	3	1.12%
Other	50	18.66%
Lotus Domino (142 servers)
Version	Number of Servers	Percent
8.5.3	29	20.42%
8.5.3FP6	23	16.20%
7.0	7	4.93%
8.5.2FP2	7	4.93%
8.5.1	7	4.93%
7.0.3	6	4.23%
7.0.2	6	4.23%
8.5.3FP1	4	2.82%
8.5.2	4	2.82%
8.5.3FP5	3	2.11%
5.0.8	3	2.11%
8.0.1	3	2.11%
6.5	2	1.41%
8.5.2FP1	2	1.41%
5.0.13	2	1.41%
8.5.3FP4	2	1.41%
6.5.1	2	1.41%
8.5.3FP3	2	1.41%
8.5.2FP4	2	1.41%
8.5.1FP5	2	1.41%
8.5.2FP3	2	1.41%
7.5.1	2	1.41%
7.0.3FP1	2	1.41%
Other	18	12.68%
MagicMail (116 servers)
Version	Number of Servers	Percent
Other	116	100.00%
WinWebMail (112 servers)
Version	Number of Servers	Percent
4.2.0.1	21	18.75%
3.9.0.7	19	16.96%
4.4.0.1	13	11.61%
3.8.1.3	10	8.93%
4.3.0.1	7	6.25%
4.1.0.1	4	3.57%
3.8.1.5	4	3.57%
3.7.6.1	4	3.57%
3.8.0.1	4	3.57%
3.8.6.1	4	3.57%
3.7.3.1	3	2.68%
1.0	3	2.68%
4.0.0.1	3	2.68%
3.8.5.1	3	2.68%
3.9.0.1	2	1.79%
3.7.5.1	2	1.79%
Other	6	5.36%
Kerio (73 servers)
Version	Number of Servers	Percent
6.7.3	18	24.66%
6.6.2	10	13.70%
6.7.0	8	10.96%
6.6.1	7	9.59%
6.5.2	5	6.85%
6.5.0	5	6.85%
6.7.1	4	5.48%
6.7.2	4	5.48%
6.4.1	2	2.74%
6.3.0	2	2.74%
5.7.9	2	2.74%
6.5.1	2	2.74%
6.0.10	1	1.37%
6.4.0	1	1.37%
6.0.8	1	1.37%
6.6.0	1	1.37%
Other	0	0.00%
Merak (73 servers)
Version	Number of Servers	Percent
8.0.3	19	26.03%
8.9.1	18	24.66%
7.6.1	7	9.59%
8.3.8	4	5.48%
8.5.0	3	4.11%
7.4.5	3	4.11%
9.0.3	3	4.11%
7.6.0	2	2.74%
8.0.1	1	1.37%
8.9.2	1	1.37%
8.3.6	1	1.37%
6.1.0	1	1.37%
7.5.2	1	1.37%
4.2.1	1	1.37%
5.8.2	1	1.37%
8.9.7	1	1.37%
7.6.4	1	1.37%
7.4.4	1	1.37%
6.0.8	1	1.37%
7.0.1	1	1.37%
8.9.0	1	1.37%
6.0.3	1	1.37%
Other	0	0.00%
Post.Office (63 servers)
Version	Number of Servers	Percent
4.4	20	31.75%
4.3	12	19.05%
4.2.2	10	15.87%
3.5.3	6	9.52%
4.1.2.4	4	6.35%
4.2	2	3.17%
4.2.1.1	2	3.17%
3.9.2	1	1.59%
4.1.1	1	1.59%
3.5.3J	1	1.59%
4.0.1	1	1.59%
4.1.0.3	1	1.59%
4.1	1	1.59%
3.1.2	1	1.59%
Other	0	0.00%
ArGoSoft (33 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	10	30.30%
1.8 (1.8.9.5)	5	15.15%
1.8 (1.8.9.3)	4	12.12%
1.8 (1.8.8.8)	2	6.06%
1.8 (1.8.7.3)	2	6.06%
1.8 (1.8.8.7)	2	6.06%
1.8 (1.8.9.2)	2	6.06%
1.8 (1.8.9.1)	2	6.06%
1.8 (1.8.8.9)	1	3.03%
1.8 (1.8.8.4)	1	3.03%
1.8 (1.8.2.1)	1	3.03%
1.8 (1.8.2.5)	1	3.03%
Other	0	0.00%
GroupWise (30 servers)
Version	Number of Servers	Percent
18.3.1	7	23.33%
18.1.1	4	13.33%
18.2.1	3	10.00%
14.0.0	2	6.67%
18.2.0	2	6.67%
14.2.1	2	6.67%
6.5.7	1	3.33%
18.0.0	1	3.33%
14.2.3	1	3.33%
6.5.0	1	3.33%
8.0.3	1	3.33%
7.0.1	1	3.33%
14.2.0	1	3.33%
18.0.2	1	3.33%
14.2.2	1	3.33%
7.0.2	1	3.33%
Other	0	0.00%
Gordano Messaging Suite (GMS) (16 servers)
Version	Number of Servers	Percent
Other	16	100.00%
Trend Micro (8 servers)
Version	Number of Servers	Percent
5.18	4	50.00%
5.7	1	12.50%
7.5ready	1	12.50%
5.5	1	12.50%
7.1	1	12.50%
Other	0	0.00%
OpenVMS (7 servers)
Version	Number of Servers	Percent
8.4	5	71.43%
7.3	2	28.57%
Other	0	0.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	3	75.00%
8.0.3	1	25.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	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%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
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%