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	1,982,169	100.0%
Number of Servers that didn't respond	360,883	18.21%
Server didn't open socket	351,613	17.74%
Server didn't provide banner	9,270	0.47%
Server provided banner	1,621,286	81.79%
Server banner identifies software in use	999,377	50.42%

As indicated by the above table, of the 1,982,169 servers queried, only 999,377 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	565,749	56.61%
Postfix	335,181	33.54%
Sendmail	46,649	4.67%
MailEnable	22,489	2.25%
MDaemon	10,936	1.09%
Microsoft	8,871	0.89%
IMail	1,992	0.20%
CommuniGate Pro	1,717	0.17%
XMail	1,008	0.10%
WinWebMail	963	0.10%
Lotus Domino	921	0.09%
SurgeSMTP	577	0.06%
Qmail Toaster	487	0.05%
Kerio	414	0.04%
OpenSMTPD	314	0.03%
Merak	267	0.03%
ArGoSoft	181	0.02%
MagicMail	171	0.02%
Post.Office	150	0.02%
Gordano Messaging Suite (GMS)	89	0.01%
GroupWise	79	0.01%
Trend Micro	64	0.01%
InterScan VirusWall	28	0.00%
VisNetic	25	0.00%
Mirapoint	14	0.00%
OpenVMS	11	0.00%
Mercury	9	0.00%
Interscan	6	0.00%
WebSTAR V	6	0.00%
MessageWall	4	0.00%
Neon Mail Server	4	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (565,749 servers)
Version	Number of Servers	Percent
4.89	307,621	54.37%
4.87	157,664	27.87%
4.88	21,651	3.83%
4.84	17,692	3.13%
4.80	10,398	1.84%
4.86	7,547	1.33%
4.85	7,388	1.31%
4.72	6,884	1.22%
4.82	6,458	1.14%
4.76	6,439	1.14%
Other	16,007	2.83%
Postfix (335,181 servers)
Version	Number of Servers	Percent
Other	335,181	100.00%
Sendmail (46,649 servers)
Version	Number of Servers	Percent
8.14.5	12,022	25.77%
8.14.4	10,658	22.85%
8.13.8	7,287	15.62%
8.13.1	4,557	9.77%
8.15.2	2,851	6.11%
8.14.3	2,116	4.54%
8.14.7	1,861	3.99%
8.14.9	1,330	2.85%
Other	3,967	8.50%
MailEnable (22,489 servers)
Version	Number of Servers	Percent
9.00--	3,061	13.61%
9.16--	1,412	6.28%
8.60--	1,145	5.09%
8.53--	999	4.44%
6.5--	832	3.70%
8.51--	672	2.99%
1.986--	531	2.36%
9.75--	503	2.24%
8.04--	486	2.16%
8.60-8.60-	413	1.84%
8.50--	332	1.48%
5.10--	326	1.45%
9.74--	323	1.44%
9.53--	295	1.31%
8.00--	290	1.29%
6.0--	226	1.00%
7.06--	225	1.00%
Other	10,418	46.32%
MDaemon (10,936 servers)
Version	Number of Servers	Percent
17.0.2	894	8.17%
16.5.2	810	7.41%
17.0.3	609	5.57%
13.5.1	541	4.95%
13.6.3	449	4.11%
11.0.0	448	4.10%
11.0.3	441	4.03%
13.0.5	424	3.88%
13.0.4	413	3.78%
16.0.4	368	3.37%
16.5.1	264	2.41%
12.5.6	240	2.19%
12.5.4	225	2.06%
15.0.3	216	1.98%
14.5.2	192	1.76%
17.0.0	188	1.72%
10.0.0	171	1.56%
10.1.2	158	1.44%
15.5.3	147	1.34%
16.0.1	138	1.26%
10.1.1	119	1.09%
10.1.0	111	1.01%
Other	3,370	30.82%
Microsoft (8,871 servers)
Version	Number of Servers	Percent
6.0.3790.4675	5,266	59.36%
7.5.7601.17514	1,103	12.43%
8.5.9600.16384	740	8.34%
6.0.3790.3959	602	6.79%
8.0.9200.16384	189	2.13%
5.0.2195.5329	162	1.83%
7.0.6002.18264	150	1.69%
6.0.3790.1830	148	1.67%
5.0.2195.7381	91	1.03%
Other	420	4.73%
IMail (1,992 servers)
Version	Number of Servers	Percent
12.5.5.115	289	14.51%
12.4.1.15	174	8.73%
8.22	153	7.68%
12.5.3.93	144	7.23%
9.23	135	6.78%
12.5.4.146	128	6.43%
12.5.6.101	115	5.77%
8.15	91	4.57%
12.3.0.100	91	4.57%
8.05	69	3.46%
11.03	56	2.81%
11.5	51	2.56%
7.07	30	1.51%
12.5.5.117	30	1.51%
12.5.1.60	28	1.41%
10.02	27	1.36%
7.15	27	1.36%
11.02	23	1.15%
10.01	21	1.05%
Other	310	15.56%
CommuniGate Pro (1,717 servers)
Version	Number of Servers	Percent
5.1.16	132	7.69%
6.1.16	85	4.95%
6.1.16.	75	4.37%
6.2	47	2.74%
6.1.17	46	2.68%
6.1.11	37	2.15%
5.4.11	36	2.10%
5.2.20	36	2.10%
6.1.10	35	2.04%
6.1.17.	32	1.86%
5.3.13.	31	1.81%
6.0.11.	29	1.69%
5.4.11.	27	1.57%
6.0.11	26	1.51%
6.0.9	26	1.51%
6.1.15.	25	1.46%
6.1.13	24	1.40%
5.1.16.	21	1.22%
5.2.20.	21	1.22%
6.0.9.	21	1.22%
5.2.3	21	1.22%
5.0.14.	21	1.22%
6.1.14	20	1.16%
6.1.11.	19	1.11%
6.1.2	19	1.11%
6.1.12.	18	1.05%
6.1.10.	18	1.05%
Other	769	44.79%
XMail (1,008 servers)
Version	Number of Servers	Percent
1.27	431	42.76%
1.22	326	32.34%
1.25	77	7.64%
1.26	65	6.45%
1.24	39	3.87%
1.21	19	1.88%
1.23	13	1.29%
Other	38	3.77%
WinWebMail (963 servers)
Version	Number of Servers	Percent
3.9.0.7	215	22.33%
3.8.1.3	140	14.54%
3.9.0.1	64	6.65%
3.8.0.1	61	6.33%
3.7.6.1	58	6.02%
3.8.1.5	44	4.57%
3.8.1.1	37	3.84%
3.8.5.1	35	3.63%
3.9.2.1	33	3.43%
3.8.6.1	32	3.32%
3.9.3.1	31	3.22%
3.9.5.1	29	3.01%
3.7.3.1	28	2.91%
3.7.7.3	26	2.70%
3.8.2.1	19	1.97%
3.8.3.1	17	1.77%
3.7.1.1	17	1.77%
3.7.0.5	11	1.14%
3.8.3.3	10	1.04%
Other	56	5.82%
Lotus Domino (921 servers)
Version	Number of Servers	Percent
8.5.3FP6	179	19.44%
8.5.3	125	13.57%
8.5.2	40	4.34%
7.0.2	36	3.91%
8.5.1	33	3.58%
8.5	31	3.37%
8.5.3FP2	25	2.71%
8.5.2FP4	24	2.61%
8.5.3FP4	24	2.61%
8.5.3FP1	23	2.50%
8.5.3FP3	21	2.28%
7.0.3	20	2.17%
8.5.2FP3	19	2.06%
8.5.3FP5	17	1.85%
8.5.2FP2	17	1.85%
8.0.1	16	1.74%
8.0	15	1.63%
7.0	14	1.52%
7.0.4	14	1.52%
6.5.1	13	1.41%
8.5.1FP5	13	1.41%
6.5	11	1.19%
7.0.3FP1	11	1.19%
6.5.4	10	1.09%
7.0.1	10	1.09%
Other	160	17.37%
SurgeSMTP (577 servers)
Version	Number of Servers	Percent
7.3c3-3	95	16.46%
7.1e-1	75	13.00%
7.2i-1	66	11.44%
6.5a2-2	36	6.24%
7.2a-1	34	5.89%
7.2e-2	31	5.37%
6.7c-1	25	4.33%
6.9c-1	20	3.47%
6.5a-1	17	2.95%
7.0c2-2	16	2.77%
3.9e-1	14	2.43%
7.3d-5	11	1.91%
5.2a-1	11	1.91%
6.1c-1	9	1.56%
4.0u4-4	9	1.56%
6.4a-1	7	1.21%
3.8k4-4	7	1.21%
Other	94	16.29%
Qmail Toaster (487 servers)
Version	Number of Servers	Percent
1.3	391	80.29%
1.03	69	14.17%
1.2	10	2.05%
1.03.5	7	1.44%
1.03.6	5	1.03%
Other	5	1.03%
Kerio (414 servers)
Version	Number of Servers	Percent
6.7.3	94	22.71%
6.7.0	51	12.32%
6.6.2	41	9.90%
6.5.2	39	9.42%
6.7.2	30	7.25%
6.5.0	24	5.80%
6.6.1	18	4.35%
6.4.1	16	3.86%
6.7.1	16	3.86%
6.3.1	14	3.38%
6.5.1	10	2.42%
6.4.0	9	2.17%
6.3.0	7	1.69%
6.1.3	7	1.69%
6.4.2	5	1.21%
6.6.0	5	1.21%
Other	28	6.76%
OpenSMTPD (314 servers)
Version	Number of Servers	Percent
Other	314	100.00%
Merak (267 servers)
Version	Number of Servers	Percent
8.0.3	74	27.72%
8.9.1	45	16.85%
8.5.0	24	8.99%
7.5.2	16	5.99%
8.3.8	15	5.62%
7.4.5	14	5.24%
7.6.1	12	4.49%
7.6.4	11	4.12%
7.4.2	5	1.87%
7.0.1	4	1.50%
9.0.3	4	1.50%
7.2.0	4	1.50%
5.9.4	3	1.12%
4.2.1	3	1.12%
7.6.0	3	1.12%
6.1.0	3	1.12%
6.0.8	3	1.12%
Other	24	8.99%
ArGoSoft (181 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	67	37.02%
1.8 (1.8.9.5)	22	12.15%
1.8 (1.8.9.3)	20	11.05%
1.8 (1.8.9.1)	17	9.39%
1.8 (1.8.8.7)	6	3.31%
1.8 (1.8.7.3)	5	2.76%
1.8 (1.8.8.8)	5	2.76%
1.8 (1.8.9.2)	5	2.76%
1.8 (1.8.6.0)	5	2.76%
1.8 (1.8.8.9)	4	2.21%
1.8 (1.8.9.4)	3	1.66%
1.8 (1.8.7.6)	2	1.10%
1.8 (1.8.8.4)	2	1.10%
1.8 (1.8.5.8)	2	1.10%
1.8 (1.8.2.1)	2	1.10%
Other	14	7.73%
MagicMail (171 servers)
Version	Number of Servers	Percent
Other	171	100.00%
Post.Office (150 servers)
Version	Number of Servers	Percent
4.2.2	31	20.67%
4.3	29	19.33%
4.1.2.4	19	12.67%
3.5.3	14	9.33%
4.2.1.3	7	4.67%
3.9.2.3	5	3.33%
4.2.1.1	5	3.33%
3.1.2	4	2.67%
3.9.2	3	2.00%
4.0.1	3	2.00%
4.1.1	3	2.00%
3.5.1	3	2.00%
3.5.4	2	1.33%
4.2	2	1.33%
4.1.0.3	2	1.33%
4.1.2.3	2	1.33%
3.8.7.4	2	1.33%
3.9.1.3	2	1.33%
3.5.3J	2	1.33%
Other	10	6.67%
Gordano Messaging Suite (GMS) (89 servers)
Version	Number of Servers	Percent
Other	89	100.00%
GroupWise (79 servers)
Version	Number of Servers	Percent
14.2.2	19	24.05%
14.2.1	11	13.92%
6.5.7	6	7.59%
14.0.1	6	7.59%
14.2.0	5	6.33%
14.0.0	4	5.06%
7.0.3	3	3.80%
12.0.4	2	2.53%
14.0.2	2	2.53%
12.0.1	2	2.53%
6.5.5	2	2.53%
8.0.2	2	2.53%
6.0.4	2	2.53%
7.0.4	2	2.53%
6.0.2	2	2.53%
7.0.2	1	1.27%
8.0.3	1	1.27%
6.5.0	1	1.27%
6.0.3	1	1.27%
7.0.1	1	1.27%
8.0.1	1	1.27%
6.5.2	1	1.27%
12.0.2	1	1.27%
6.5.4	1	1.27%
Other	0	0.00%
Trend Micro (64 servers)
Version	Number of Servers	Percent
5.7	20	31.25%
5.18	12	18.75%
5.5	12	18.75%
7.0	8	12.50%
7.5	5	7.81%
7.1	2	3.12%
3.53	2	3.12%
8.5	1	1.56%
8	1	1.56%
9.0	1	1.56%
Other	0	0.00%
InterScan VirusWall (28 servers)
Version	Number of Servers	Percent
Other	28	100.00%
VisNetic (25 servers)
Version	Number of Servers	Percent
9.3.2.0	8	32.00%
5.0.2.3	2	8.00%
5.8.6.6	2	8.00%
5.5.8.3	2	8.00%
6.2.2.0	1	4.00%
8.0.3	1	4.00%
9.1.4.0	1	4.00%
8.5.0.5	1	4.00%
7.6.1.0	1	4.00%
9.1.4.1	1	4.00%
8.0.3.1	1	4.00%
5.3.5.0	1	4.00%
5.0.2.0	1	4.00%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	4.00%
8.5.0.8	1	4.00%
Other	0	0.00%
Mirapoint (14 servers)
Version	Number of Servers	Percent
4.4.3-GA	4	28.57%
4.3.5-GA	3	21.43%
4.4.2a-FCS	2	14.29%
4.4.4-GA	1	7.14%
3.10.10a-GA	1	7.14%
4.4.3a-GA	1	7.14%
3.7.5a-GA	1	7.14%
4.4.6-GA	1	7.14%
Other	0	0.00%
OpenVMS (11 servers)
Version	Number of Servers	Percent
7.3	6	54.55%
8.4	3	27.27%
8.2	1	9.09%
8.3	1	9.09%
Other	0	0.00%
Mercury (9 servers)
Version	Number of Servers	Percent
3.32	4	44.44%
1.48	3	33.33%
3.21	1	11.11%
4.x	1	11.11%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
WebSTAR V (6 servers)
Version	Number of Servers	Percent
5.4.1	3	50.00%
5.4.0	1	16.67%
5.3.2	1	16.67%
5.3.4	1	16.67%
Other	0	0.00%
MessageWall (4 servers)
Version	Number of Servers	Percent
1.0.8	4	100.00%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.1.0	2	50.00%
3.0.7	1	25.00%
3.1.2	1	25.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%