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	2,361,489	100.0%
Number of Servers that didn't respond	413,207	17.50%
Server didn't open socket	403,215	17.07%
Server didn't provide banner	9,992	0.42%
Server provided banner	1,948,282	82.50%
Server banner identifies software in use	1,100,753	46.61%

As indicated by the above table, of the 2,361,489 servers queried, only 1,100,753 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	576,860	52.41%
Postfix	327,354	29.74%
Sendmail	90,284	8.20%
Microsoft	39,545	3.59%
MailEnable	29,886	2.72%
MDaemon	17,958	1.63%
IMail	4,523	0.41%
Lotus Domino	2,652	0.24%
CommuniGate Pro	2,620	0.24%
WinWebMail	1,964	0.18%
XMail	1,658	0.15%
Qmail Toaster	964	0.09%
Kerio	939	0.09%
SurgeSMTP	870	0.08%
Merak	682	0.06%
ArGoSoft	422	0.04%
MagicMail	272	0.02%
Post.Office	256	0.02%
GroupWise	230	0.02%
Gordano Messaging Suite (GMS)	200	0.02%
Trend Micro	165	0.01%
OpenSMTPD	127	0.01%
InterScan VirusWall	81	0.01%
VisNetic	58	0.01%
Mirapoint	58	0.01%
Mercury	28	0.00%
Interscan	21	0.00%
WebSTAR V	19	0.00%
Neon Mail Server	14	0.00%
OpenVMS	14	0.00%
NetIQ MailMarshal	11	0.00%
MessageWall	6	0.00%
ModusMail	5	0.00%
WebSTAR	4	0.00%
MAILsweeper	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (576,860 servers)
Version	Number of Servers	Percent
4.82	453,175	78.56%
4.80.1	24,884	4.31%
4.80	23,215	4.02%
4.76	18,854	3.27%
4.72	15,871	2.75%
4.69	9,893	1.71%
4.84	8,349	1.45%
4.77	6,525	1.13%
Other	16,094	2.79%
Postfix (327,354 servers)
Version	Number of Servers	Percent
Other	327,354	100.00%
Sendmail (90,284 servers)
Version	Number of Servers	Percent
8.13.8	20,281	22.46%
8.14.5	18,606	20.61%
8.14.4	14,794	16.39%
8.13.1	11,783	13.05%
8.14.3	6,744	7.47%
8.12.11.20060308	2,379	2.64%
8.13.6.20060614	2,314	2.56%
8.14.7	1,686	1.87%
8.14.2	1,274	1.41%
8.11.6	1,087	1.20%
8.12.10	1,041	1.15%
8.14.9	985	1.09%
8.14.1	939	1.04%
Other	6,371	7.06%
Microsoft (39,545 servers)
Version	Number of Servers	Percent
6.0.3790.4675	30,698	77.63%
6.0.3790.3959	3,392	8.58%
7.5.7601.17514	2,107	5.33%
6.0.3790.1830	903	2.28%
7.0.6002.18264	426	1.08%
5.0.2195.7381	411	1.04%
Other	1,608	4.07%
MailEnable (29,886 servers)
Version	Number of Servers	Percent
1.986--	2,686	8.99%
6.5--	2,209	7.39%
5.10--	1,334	4.46%
8.04--	1,085	3.63%
8.51--	976	3.27%
6.0--	965	3.23%
4.26--	956	3.20%
8.00--	830	2.78%
7.06--	810	2.71%
8.50--	765	2.56%
7.07--	546	1.83%
1.981--	509	1.70%
7.50--	487	1.63%
6.57--	468	1.57%
7.0--	463	1.55%
7.53--	462	1.55%
6.70--	442	1.48%
6.03--	311	1.04%
Other	13,582	45.45%
MDaemon (17,958 servers)
Version	Number of Servers	Percent
14.0.3	3,085	17.18%
14.0.2	1,109	6.18%
11.0.3	1,056	5.88%
11.0.0	946	5.27%
13.0.4	844	4.70%
13.0.5	752	4.19%
13.5.1	720	4.01%
10.0.0	476	2.65%
12.5.6	469	2.61%
13.6.2	446	2.48%
14.0.0	399	2.22%
10.1.2	369	2.05%
13.6.0	344	1.92%
10.1.1	336	1.87%
12.5.4	326	1.82%
13.5.2	288	1.60%
13.0.3	272	1.51%
10.1.0	265	1.48%
13.0.2	258	1.44%
9.6.1	247	1.38%
9.6.6	246	1.37%
13.6.1	233	1.30%
9.6.2	231	1.29%
Other	4,241	23.62%
IMail (4,523 servers)
Version	Number of Servers	Percent
12.3.0.100	567	12.54%
8.22	502	11.10%
12.2.0.235	425	9.40%
9.23	290	6.41%
12.4.1.15	278	6.15%
11.5	267	5.90%
8.15	239	5.28%
8.05	200	4.42%
12.4.2.27	191	4.22%
12.4.0.166	147	3.25%
11.03	130	2.87%
11.01	111	2.45%
12.4.1.9	111	2.45%
12.1.0.270	99	2.19%
10.02	87	1.92%
7.15	83	1.84%
11.02	80	1.77%
6.06	78	1.72%
7.07	64	1.41%
8.00	48	1.06%
Other	526	11.63%
Lotus Domino (2,652 servers)
Version	Number of Servers	Percent
8.5.3	430	16.21%
8.5.3FP6	189	7.13%
8.5.2	147	5.54%
8.5.3FP3	122	4.60%
8.5.3FP2	105	3.96%
7.0.2	104	3.92%
8.5.1	103	3.88%
8.5.3FP4	100	3.77%
8.5.3FP5	86	3.24%
8.5.2FP3	77	2.90%
8.5.2FP2	76	2.87%
8.5	75	2.83%
8.5.3FP1	67	2.53%
8.5.2FP4	65	2.45%
7.0.3	57	2.15%
8.5.1FP5	49	1.85%
7.0	40	1.51%
7.0.1	38	1.43%
6.5.1	38	1.43%
8.0.2	36	1.36%
6.5.3	36	1.36%
6.5.4	34	1.28%
8.0.1	33	1.24%
8.0	31	1.17%
6.5	30	1.13%
Other	484	18.25%
CommuniGate Pro (2,620 servers)
Version	Number of Servers	Percent
6.0.9	265	10.11%
5.1.16	238	9.08%
6.0.8	93	3.55%
6.0.7	87	3.32%
6.0.9.	82	3.13%
4.1.8	71	2.71%
5.2.20	68	2.60%
6.0.5	59	2.25%
5.4.11	53	2.02%
6.0.10	39	1.49%
5.0.14	38	1.45%
6.0.7.	35	1.34%
5.2.3	33	1.26%
5.3.13	32	1.22%
4.2.10	32	1.22%
5.4.4	29	1.11%
5.1.16.	29	1.11%
5.3.15	27	1.03%
6.0.1	27	1.03%
Other	1,283	48.97%
WinWebMail (1,964 servers)
Version	Number of Servers	Percent
3.8.1.3	347	17.67%
3.8.0.1	193	9.83%
3.7.6.1	172	8.76%
3.9.0.1	136	6.92%
3.8.1.5	133	6.77%
3.7.3.1	110	5.60%
3.8.6.1	108	5.50%
3.8.5.1	108	5.50%
3.8.1.1	104	5.30%
3.7.7.3	85	4.33%
3.9.0.7	85	4.33%
3.8.2.1	59	3.00%
3.7.1.1	56	2.85%
3.7.5.1	37	1.88%
3.8.3.1	36	1.83%
3.9.0.5	36	1.83%
3.8.3.3	30	1.53%
3.7.0.3	23	1.17%
3.6.3.1	22	1.12%
3.7.0.5	20	1.02%
Other	64	3.26%
XMail (1,658 servers)
Version	Number of Servers	Percent
1.27	568	34.26%
1.22	457	27.56%
1.25	231	13.93%
1.26	154	9.29%
1.24	90	5.43%
1.21	43	2.59%
1.23	25	1.51%
Other	90	5.43%
Qmail Toaster (964 servers)
Version	Number of Servers	Percent
1.3	906	93.98%
1.2	30	3.11%
Other	28	2.90%
Kerio (939 servers)
Version	Number of Servers	Percent
6.7.3	184	19.60%
6.7.0	96	10.22%
6.6.2	87	9.27%
6.5.2	68	7.24%
6.5.0	67	7.14%
6.7.2	59	6.28%
6.4.1	51	5.43%
6.6.1	41	4.37%
6.3.1	40	4.26%
6.7.1	38	4.05%
6.5.1	26	2.77%
6.4.0	26	2.77%
6.3.0	24	2.56%
6.4.2	23	2.45%
6.6.0	14	1.49%
6.1.3	11	1.17%
6.0.10	10	1.06%
6.2.0	10	1.06%
Other	64	6.82%
SurgeSMTP (870 servers)
Version	Number of Servers	Percent
6.5a2-2	219	25.17%
6.5a-1	80	9.20%
6.3c2-2	60	6.90%
6.7c-1	47	5.40%
6.4a-1	40	4.60%
5.2a-1	37	4.25%
6.7a-1	34	3.91%
6.7b-13	33	3.79%
5.3h2-2	27	3.10%
3.9e-1	26	2.99%
6.1c-1	24	2.76%
3.8k4-4	17	1.95%
4.0u4-4	13	1.49%
6.0a5-5	12	1.38%
Other	201	23.10%
Merak (682 servers)
Version	Number of Servers	Percent
8.0.3	239	35.04%
8.9.1	90	13.20%
8.5.0	48	7.04%
8.3.8	38	5.57%
7.5.2	33	4.84%
7.4.5	32	4.69%
7.6.4	28	4.11%
7.6.1	14	2.05%
7.0.1	12	1.76%
7.4.2	10	1.47%
7.2.0	10	1.47%
9.0.0	10	1.47%
8.3.15	10	1.47%
8.9.0	9	1.32%
8.2.4	8	1.17%
6.2.1	7	1.03%
7.1.6	7	1.03%
Other	77	11.29%
ArGoSoft (422 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	110	26.07%
1.8 (1.8.9.3)	60	14.22%
1.8 (1.8.9.5)	58	13.74%
1.8 (1.8.9.1)	42	9.95%
1.8 (1.8.8.7)	25	5.92%
1.8 (1.8.8.8)	23	5.45%
1.8 (1.8.9.2)	16	3.79%
1.8 (1.8.9.4)	11	2.61%
1.8 (1.8.6.0)	9	2.13%
1.8 (1.8.7.3)	7	1.66%
1.8 (1.8.8.9)	6	1.42%
Other	55	13.03%
MagicMail (272 servers)
Version	Number of Servers	Percent
Other	272	100.00%
Post.Office (256 servers)
Version	Number of Servers	Percent
3.5.3	39	15.23%
4.1.2.4	35	13.67%
4.2.2	34	13.28%
4.1.0.2	15	5.86%
4.1.1	13	5.08%
3.9.2.3	9	3.52%
4.0.1	9	3.52%
3.5.3J	8	3.12%
4.1.0.3	8	3.12%
4.2.1.3	8	3.12%
4.2	7	2.73%
3.1.2J	6	2.34%
4.2.1.1	6	2.34%
3.8.7.4	5	1.95%
3.1.2	4	1.56%
3.5.4	4	1.56%
3.5.1	4	1.56%
3.9.2	3	1.17%
4.1.2.3	3	1.17%
3.5.2	3	1.17%
3.9.1.2	3	1.17%
4.1.0.4	3	1.17%
4.1.2.2	3	1.17%
3.9.1	3	1.17%
Other	21	8.20%
GroupWise (230 servers)
Version	Number of Servers	Percent
7.0.3	34	14.78%
6.5.7	26	11.30%
8.0.2	26	11.30%
7.0.4	20	8.70%
8.0.3	18	7.83%
7.0.2	14	6.09%
14.0.0	13	5.65%
12.0.2	12	5.22%
6.5.6	8	3.48%
14.0.1	8	3.48%
6.5.4	7	3.04%
7.0.1	6	2.61%
6.0.4	5	2.17%
8.0.1	4	1.74%
12.0.1	4	1.74%
6.5.5	3	1.30%
6.5.0	3	1.30%
12.0.0	3	1.30%
Other	16	6.96%
Gordano Messaging Suite (GMS) (200 servers)
Version	Number of Servers	Percent
Other	200	100.00%
Trend Micro (165 servers)
Version	Number of Servers	Percent
5.7	63	38.18%
5.18	35	21.21%
5.5	33	20.00%
7.0	13	7.88%
7.1	9	5.45%
8.5	4	2.42%
3.53	2	1.21%
Other	6	3.64%
OpenSMTPD (127 servers)
Version	Number of Servers	Percent
Other	127	100.00%
InterScan VirusWall (81 servers)
Version	Number of Servers	Percent
Other	81	100.00%
VisNetic (58 servers)
Version	Number of Servers	Percent
9.3.2.0	15	25.86%
9.1.4.1	6	10.34%
7.2.4.1	4	6.90%
8.5.0.8	4	6.90%
8.0.3.1	3	5.17%
6.2.2.0	3	5.17%
5.8.6.6	3	5.17%
8.0.3	2	3.45%
5.0.2.3	2	3.45%
9.1.4.0	2	3.45%
7.6.1.0	2	3.45%
5.5.8.3	2	3.45%
5.3.5.0	2	3.45%
8.3.5.0	1	1.72%
8.3.0.1	1	1.72%
8.5.0.5	1	1.72%
5.4.5.4	1	1.72%
8.0.3.0	1	1.72%
5.4.5	1	1.72%
5.0.2.0	1	1.72%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.72%
Other	0	0.00%
Mirapoint (58 servers)
Version	Number of Servers	Percent
4.3.5-GA	8	13.79%
4.4.3-GA	7	12.07%
4.4.2a-FCS	5	8.62%
4.3.6-GA	5	8.62%
4.1.10-GA	4	6.90%
4.4.5-GA	3	5.17%
3.10.10a-GA	3	5.17%
3.10.4-GA	2	3.45%
4.1.9-GA	2	3.45%
4.4.4b-GA	2	3.45%
4.1.5-GA	2	3.45%
3.10.7-GA	2	3.45%
4.1.3-GA	1	1.72%
3.4.6-GR	1	1.72%
4.4.4-GA	1	1.72%
4.3.7-GA	1	1.72%
4.2.4-GA	1	1.72%
4.1.6-GA	1	1.72%
3.7.5a-GA	1	1.72%
4.2.3-GA	1	1.72%
4.3.3-GA	1	1.72%
4.4.5a-GA	1	1.72%
3.7.3a-GA	1	1.72%
3.8.4-GA	1	1.72%
3.10.2-GA	1	1.72%
Other	0	0.00%
Mercury (28 servers)
Version	Number of Servers	Percent
1.48	13	46.43%
3.32	12	42.86%
3.21	1	3.57%
3.21c	1	3.57%
4.x	1	3.57%
Other	0	0.00%
Interscan (21 servers)
Version	Number of Servers	Percent
3.81-Build_1022	4	19.05%
3.55 (build 1016)	4	19.05%
3.81-Build_1084	3	14.29%
3.55 (build 1029)	2	9.52%
3.53 (build 1493)	2	9.52%
3.5 (build 1294)	1	4.76%
3.8-Build_3013	1	4.76%
3.55 (build 1020)	1	4.76%
3.53 (build 2013)	1	4.76%
3.53 (build 2017)	1	4.76%
3.8-Build_1080	1	4.76%
Other	0	0.00%
WebSTAR V (19 servers)
Version	Number of Servers	Percent
5.4.1	9	47.37%
5.4.0	6	31.58%
5.3.4	3	15.79%
5.3.3	1	5.26%
Other	0	0.00%
Neon Mail Server (14 servers)
Version	Number of Servers	Percent
3.0.7	4	28.57%
3.1.4	3	21.43%
3.1.2	2	14.29%
3.1.0	2	14.29%
3.1.3	1	7.14%
3.0.6	1	7.14%
3.0.9	1	7.14%
Other	0	0.00%
OpenVMS (14 servers)
Version	Number of Servers	Percent
8.3	6	42.86%
7.3	4	28.57%
8.4	3	21.43%
8.2	1	7.14%
Other	0	0.00%
NetIQ MailMarshal (11 servers)
Version	Number of Servers	Percent
6.0.3.8	6	54.55%
5.5.6.5	2	18.18%
5.5.5.6	1	9.09%
5.5.4.17	1	9.09%
5.5.6.7	1	9.09%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
ModusMail (5 servers)
Version	Number of Servers	Percent
4.35.477.0	2	40.00%
4.1.361.21	1	20.00%
3.2.315.0	1	20.00%
3.1.302.0	1	20.00%
Other	0	0.00%
WebSTAR (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
MAILsweeper (3 servers)
Version	Number of Servers	Percent
4.3.17.0	2	66.67%
4.3.20.0	1	33.33%
Other	0	0.00%