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	2,293,034	100.0%
Number of Servers that didn't respond	374,574	16.34%
Server didn't open socket	362,293	15.80%
Server didn't provide banner	12,281	0.54%
Server provided banner	1,918,460	83.66%
Server banner identifies software in use	1,044,879	45.57%

As indicated by the above table, of the 2,293,034 servers queried, only 1,044,879 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	432,014	41.35%
Postfix	240,960	23.06%
Microsoft	141,304	13.52%
Sendmail	137,002	13.11%
MailEnable	33,425	3.20%
MDaemon	22,048	2.11%
IMail	10,289	0.98%
Lotus Domino	5,053	0.48%
WinWebMail	4,327	0.41%
CommuniGate Pro	3,543	0.34%
Kerio	2,507	0.24%
XMail	2,483	0.24%
Merak	1,899	0.18%
Qmail Toaster	1,752	0.17%
SurgeSMTP	1,274	0.12%
ArGoSoft	1,110	0.11%
GroupWise	907	0.09%
Trend Micro	559	0.05%
Gordano Messaging Suite (GMS)	468	0.04%
Post.Office	466	0.04%
MagicMail	381	0.04%
Mirapoint	259	0.02%
VisNetic	227	0.02%
InterScan VirusWall	196	0.02%
NetIQ MailMarshal	84	0.01%
Interscan	78	0.01%
Mercury	64	0.01%
WebSTAR V	48	0.00%
Neon Mail Server	46	0.00%
MessageWall	27	0.00%
OpenVMS	19	0.00%
WebSTAR	18	0.00%
ModusMail	18	0.00%
OpenSMTPD	13	0.00%
MAILsweeper	11	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (432,014 servers)
Version	Number of Servers	Percent
4.69	344,274	79.69%
4.76	33,444	7.74%
4.72	21,065	4.88%
4.67	9,932	2.30%
4.63	6,037	1.40%
4.71	4,476	1.04%
Other	12,786	2.96%
Postfix (240,960 servers)
Version	Number of Servers	Percent
Other	240,960	100.00%
Microsoft (141,304 servers)
Version	Number of Servers	Percent
6.0.3790.4675	107,194	75.86%
6.0.3790.3959	21,825	15.45%
6.0.3790.1830	5,973	4.23%
5.0.2195.7381	1,867	1.32%
Other	4,445	3.15%
Sendmail (137,002 servers)
Version	Number of Servers	Percent
8.13.8	32,007	23.36%
8.13.1	24,215	17.67%
8.14.4	18,567	13.55%
8.14.3	18,337	13.38%
8.12.11.20060308	6,485	4.73%
8.13.6.20060614	4,805	3.51%
8.14.2	3,923	2.86%
8.11.6	3,455	2.52%
8.12.10	3,392	2.48%
8.13.6	2,916	2.13%
8.14.1	2,808	2.05%
8.12.11.20060614	2,540	1.85%
8.13.7	2,075	1.51%
8.12.11	1,990	1.45%
8.12.8	1,662	1.21%
8.13.4	1,578	1.15%
Other	6,247	4.56%
MailEnable (33,425 servers)
Version	Number of Servers	Percent
1.986--	10,324	30.89%
4.26--	2,782	8.32%
1.981--	2,146	6.42%
1.983--	1,354	4.05%
5.10--	924	2.76%
3.62--	915	2.74%
0-3.63-	912	2.73%
5.11--	785	2.35%
0-4.26-	579	1.73%
4.22--	552	1.65%
4.23--	526	1.57%
0-1.87-	433	1.30%
0-2.53-	419	1.25%
1.95--	388	1.16%
1.96--	388	1.16%
--3.63	384	1.15%
4.14--	362	1.08%
0-5.11-	362	1.08%
Other	8,890	26.60%
MDaemon (22,048 servers)
Version	Number of Servers	Percent
12.0.3	3,894	17.66%
11.0.3	3,387	15.36%
11.0.0	1,225	5.56%
10.1.2	1,117	5.07%
10.0.0	1,054	4.78%
10.1.1	865	3.92%
9.6.1	653	2.96%
12.0.1	645	2.93%
9.6.6	610	2.77%
10.1.0	531	2.41%
12.0.0	431	1.95%
9.6.5	417	1.89%
9.5.2	415	1.88%
12.0.2	395	1.79%
10.0.5	382	1.73%
10.0.2	378	1.71%
9.6.2	360	1.63%
9.5.1	342	1.55%
9.5.6	328	1.49%
9.6.4	318	1.44%
10.0.4	303	1.37%
8.1.3	297	1.35%
9.0.4	274	1.24%
11.0.2	263	1.19%
Other	3,164	14.35%
IMail (10,289 servers)
Version	Number of Servers	Percent
8.22	1,991	19.35%
11.5	1,015	9.86%
8.15	740	7.19%
11.03	715	6.95%
9.23	589	5.72%
11.01	532	5.17%
11.02	469	4.56%
8.05	435	4.23%
9.10	406	3.95%
9.20	368	3.58%
10.02	318	3.09%
11.0	313	3.04%
7.07	271	2.63%
9.21	240	2.33%
7.15	237	2.30%
8.00	205	1.99%
6.06	181	1.76%
10.01	153	1.49%
8.04	122	1.19%
8.10	104	1.01%
Other	885	8.60%
Lotus Domino (5,053 servers)
Version	Number of Servers	Percent
8.5.2	587	11.62%
8.5.2FP2	545	10.79%
8.5.1	378	7.48%
7.0.2	277	5.48%
8.5.2FP1	276	5.46%
8.5	262	5.19%
7.0.3	164	3.25%
8.0.1	140	2.77%
7.0.1	132	2.61%
8.0.2	128	2.53%
6.5.4	120	2.37%
6.5.1	109	2.16%
8.5.1FP5	108	2.14%
8.5.1FP3	107	2.12%
8.5.2FP3	104	2.06%
6.5.3	102	2.02%
7.0	88	1.74%
6.5.5	87	1.72%
8.0	86	1.70%
7.0.2FP2	77	1.52%
8.5.1FP4	71	1.41%
8.5.1FP2	69	1.37%
7.0.3FP1	69	1.37%
6.5	66	1.31%
Other	901	17.83%
WinWebMail (4,327 servers)
Version	Number of Servers	Percent
3.8.1.3	911	21.05%
3.8.0.1	813	18.79%
3.7.6.1	611	14.12%
3.7.7.3	400	9.24%
3.7.3.1	396	9.15%
3.8.1.1	389	8.99%
3.7.1.1	193	4.46%
3.7.5.1	147	3.40%
3.7.7.1	123	2.84%
3.6.3.1	99	2.29%
3.7.0.3	78	1.80%
3.7.0.5	77	1.78%
3.7.0.7	58	1.34%
Other	32	0.74%
CommuniGate Pro (3,543 servers)
Version	Number of Servers	Percent
5.1.16	276	7.79%
4.1.8	182	5.14%
5.3.13	181	5.11%
5.4.0	166	4.69%
5.2.20	121	3.42%
5.3.8	114	3.22%
5.2.16	104	2.94%
4.2.10	103	2.91%
5.3.12	86	2.43%
5.2.19	82	2.31%
5.1.12	80	2.26%
5.4	76	2.15%
5.0.14	73	2.06%
5.3.10	72	2.03%
5.3.9	69	1.95%
5.2.3	67	1.89%
5.2.14	66	1.86%
5.3.11	65	1.83%
5.2.12	63	1.78%
5.2.8	56	1.58%
5.3.14	55	1.55%
5.4.1	54	1.52%
5.1.13	52	1.47%
5.3.7	44	1.24%
5.3.5	42	1.19%
5.1.14	42	1.19%
5.2.13	41	1.16%
5.3.2	40	1.13%
5.2.18	38	1.07%
5.2.0	37	1.04%
5.2.10	36	1.02%
Other	960	27.10%
Kerio (2,507 servers)
Version	Number of Servers	Percent
6.7.3	339	13.52%
6.6.2	280	11.17%
6.7.0	228	9.09%
6.7.2	172	6.86%
6.5.0	166	6.62%
6.5.2	164	6.54%
6.7.1	137	5.46%
6.3.1	135	5.38%
6.4.1	129	5.15%
6.4.0	100	3.99%
6.6.0	93	3.71%
6.5.1	84	3.35%
6.6.1	72	2.87%
6.4.2	56	2.23%
6.3.0	46	1.83%
6.2.0	28	1.12%
6.2.2	26	1.04%
Other	252	10.05%
XMail (2,483 servers)
Version	Number of Servers	Percent
1.22	594	23.92%
1.25	510	20.54%
1.27	384	15.47%
1.26	328	13.21%
1.24	255	10.27%
1.21	110	4.43%
1.23	69	2.78%
1.20	54	2.17%
1.17	44	1.77%
1.12	38	1.53%
Other	97	3.91%
Merak (1,899 servers)
Version	Number of Servers	Percent
8.0.3	777	40.92%
8.9.1	180	9.48%
8.5.0	138	7.27%
7.5.2	85	4.48%
7.6.4	78	4.11%
8.3.8	72	3.79%
7.4.5	63	3.32%
8.2.13	50	2.63%
9.0.0	32	1.69%
7.4.2	27	1.42%
7.2.0	25	1.32%
8.2.4	25	1.32%
7.6.1	25	1.32%
8.3.15	24	1.26%
7.0.1	21	1.11%
8.9.0	21	1.11%
Other	256	13.48%
Qmail Toaster (1,752 servers)
Version	Number of Servers	Percent
1.3	1,637	93.44%
1.2	79	4.51%
1.0	24	1.37%
Other	12	0.68%
SurgeSMTP (1,274 servers)
Version	Number of Servers	Percent
5.2a-1	350	27.47%
3.9e-1	105	8.24%
4.2d4-4	89	6.99%
5.3h2-2	82	6.44%
5.3h-1	59	4.63%
5.0e4-4	53	4.16%
3.8k4-4	49	3.85%
4.0u4-4	46	3.61%
4.2d2-2	29	2.28%
3.8i3-3	25	1.96%
5.0e3-3	24	1.88%
4.3g2-2	21	1.65%
3.7b8-8	18	1.41%
5.1c2-2	18	1.41%
3.6f5-5	16	1.26%
4.3e-1	15	1.18%
3.9h-18	15	1.18%
4.3g4-4	15	1.18%
3.9c-1	15	1.18%
4.2a3-3	14	1.10%
5.1c-1	14	1.10%
3.8f2-2	13	1.02%
Other	189	14.84%
ArGoSoft (1,110 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	253	22.79%
1.8 (1.8.9.5)	175	15.77%
1.8 (1.8.9.3)	141	12.70%
1.8 (1.8.9.1)	102	9.19%
1.8 (1.8.8.8)	82	7.39%
1.8 (1.8.8.7)	65	5.86%
1.8 (1.8.9.2)	45	4.05%
1.8 (1.8.9.4)	30	2.70%
1.8 (1.8.6.0)	17	1.53%
1.8 (1.8.8.9)	17	1.53%
1.8 (1.8.8.2)	14	1.26%
1.8 (1.8.9.0)	14	1.26%
1.8 (1.8.8.1)	14	1.26%
Other	141	12.70%
GroupWise (907 servers)
Version	Number of Servers	Percent
7.0.3	209	23.04%
8.0.2	172	18.96%
6.5.7	102	11.25%
7.0.2	74	8.16%
8.0.1	56	6.17%
7.0.4	54	5.95%
6.5.4	41	4.52%
7.0.1	38	4.19%
6.5.6	28	3.09%
6.0.4	27	2.98%
6.5.1	23	2.54%
8.0.0	20	2.21%
6.5.5	14	1.54%
7.0	12	1.32%
Other	37	4.08%
Trend Micro (559 servers)
Version	Number of Servers	Percent
5.7	234	41.86%
5.5	143	25.58%
5.18	99	17.71%
7.0	50	8.94%
7.1	17	3.04%
Other	16	2.86%
Gordano Messaging Suite (GMS) (468 servers)
Version	Number of Servers	Percent
Other	468	100.00%
Post.Office (466 servers)
Version	Number of Servers	Percent
3.5.3	73	15.67%
4.1.0.2	54	11.59%
4.0.1	43	9.23%
4.1.2.4	32	6.87%
4.1.1	22	4.72%
3.5.3J	20	4.29%
3.8.3	18	3.86%
3.9.2.3	15	3.22%
3.9.2	13	2.79%
3.1.2J	11	2.36%
4.1.0.3	10	2.15%
3.6.2	10	2.15%
3.1.2	9	1.93%
4.0.1.1	9	1.93%
3.9.1	9	1.93%
4.1.0.4	9	1.93%
3.9.2.1	8	1.72%
3.8.7.4	8	1.72%
4.1	7	1.50%
4.1.2.2	7	1.50%
4.1.2.3	7	1.50%
4.0.0.2	7	1.50%
3.9.1.3	6	1.29%
4.0.0.1	6	1.29%
3.9.1.2	5	1.07%
3.5.2	5	1.07%
3.6.3	5	1.07%
Other	38	8.15%
MagicMail (381 servers)
Version	Number of Servers	Percent
Other	381	100.00%
Mirapoint (259 servers)
Version	Number of Servers	Percent
4.2.3-GA	26	10.04%
3.8.4-GA	24	9.27%
3.10.10a-GA	23	8.88%
3.10.5-GA	22	8.49%
3.8.3-GA	17	6.56%
3.10.8-GA	15	5.79%
3.10.9-GA	15	5.79%
4.1.10-GA	14	5.41%
3.10.7-GA	12	4.63%
4.1.3-GA	11	4.25%
4.1.9-GA	9	3.47%
4.1.8-GA	8	3.09%
3.10.3-GA	7	2.70%
3.8.2-GA	6	2.32%
3.8.7a	6	2.32%
3.10.4-GA	5	1.93%
4.1.4-GA	5	1.93%
3.10.6-GA	5	1.93%
3.8.5-GA	4	1.54%
3.7.5a-GA	3	1.16%
3.8.6-GA	3	1.16%
4.1.5-GA	3	1.16%
Other	16	6.18%
VisNetic (227 servers)
Version	Number of Servers	Percent
9.3.2.0	78	34.36%
9.1.4.1	29	12.78%
5.8.6.6	15	6.61%
8.5.0.8	12	5.29%
5.5.8.3	10	4.41%
8.0.3.1	8	3.52%
7.6.1.0	7	3.08%
8.0.3	6	2.64%
8.3.5.0	5	2.20%
6.2.2.0	5	2.20%
8.0.3.0	5	2.20%
5.0.2.3	5	2.20%
5.0.2.1	4	1.76%
7.2.4.1	4	1.76%
5.3.5.0	4	1.76%
9.1.4.0	4	1.76%
7.2.4.0	3	1.32%
5.4.5.4	3	1.32%
Other	20	8.81%
InterScan VirusWall (196 servers)
Version	Number of Servers	Percent
Other	196	100.00%
NetIQ MailMarshal (84 servers)
Version	Number of Servers	Percent
6.0.3.8	58	69.05%
5.5.6.7	7	8.33%
6.1.3.15	6	7.14%
5.5.4.16	4	4.76%
5.5.6.6	3	3.57%
6.5.4.7535	1	1.19%
5.5.5.9	1	1.19%
5.5.4.17	1	1.19%
5.5.6.5	1	1.19%
5.5.3.17	1	1.19%
5.5.5.6	1	1.19%
Other	0	0.00%
Interscan (78 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	14	17.95%
3.81-Build_1022	10	12.82%
3.55 (build 1029)	9	11.54%
3.53 (build 2017)	8	10.26%
3.8-Build_3013	7	8.97%
3.81-Build_1084	6	7.69%
3.53 (build 1493)	4	5.13%
3.53 (build 2011)	4	5.13%
3.55 (build 1020)	4	5.13%
3.52 (build 1375)	3	3.85%
3.53 (build 2013)	2	2.56%
3.8-Build_1080	2	2.56%
3.81-Build_1055	1	1.28%
3.51 (build 1321)	1	1.28%
3.5 (build 1294)	1	1.28%
3.6-Build_1246	1	1.28%
3.8-Build_3045	1	1.28%
Other	0	0.00%
Mercury (64 servers)
Version	Number of Servers	Percent
1.48	33	51.56%
3.32	15	23.44%
3.21c	5	7.81%
3.21	2	3.12%
3.01a	2	3.12%
1.47	2	3.12%
3.30	2	3.12%
1.44	1	1.56%
3.31	1	1.56%
1.49	1	1.56%
Other	0	0.00%
WebSTAR V (48 servers)
Version	Number of Servers	Percent
5.4.1	20	41.67%
5.4.0	10	20.83%
5.3.4	7	14.58%
5.3.3	5	10.42%
5.3.2	4	8.33%
5.3.0	1	2.08%
5.3.1	1	2.08%
Other	0	0.00%
Neon Mail Server (46 servers)
Version	Number of Servers	Percent
3.1.3	13	28.26%
3.0.7	9	19.57%
3.0.9	6	13.04%
3.1.0	5	10.87%
3.1.4	4	8.70%
3.1.2	4	8.70%
3.0.6	2	4.35%
3.1.5	2	4.35%
3.1.1	1	2.17%
Other	0	0.00%
MessageWall (27 servers)
Version	Number of Servers	Percent
1.0.8	26	96.30%
1.0.6	1	3.70%
Other	0	0.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	9	47.37%
7.3	7	36.84%
6.1	1	5.26%
8.2	1	5.26%
8.4	1	5.26%
Other	0	0.00%
WebSTAR (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
ModusMail (18 servers)
Version	Number of Servers	Percent
4.35.477.0	8	44.44%
4.35.480.0	3	16.67%
4.1.361.21	1	5.56%
4.2.425.22	1	5.56%
3.2.315.0	1	5.56%
4.0.340.3	1	5.56%
4.3.459.0	1	5.56%
4.35.477.8	1	5.56%
3.1.302.0	1	5.56%
Other	0	0.00%
OpenSMTPD (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
MAILsweeper (11 servers)
Version	Number of Servers	Percent
4.3.17.0	3	27.27%
4.3.14.0	2	18.18%
4.3.20.0	2	18.18%
4.3.19.0	2	18.18%
4.3.1.0	1	9.09%
4.3.6.0	1	9.09%
Other	0	0.00%