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	2,494,680	100.0%
Number of Servers that didn't respond	448,256	17.97%
Server didn't open socket	435,948	17.48%
Server didn't provide banner	12,308	0.49%
Server provided banner	2,046,424	82.03%
Server banner identifies software in use	1,121,165	44.94%

As indicated by the above table, of the 2,494,680 servers queried, only 1,121,165 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	521,887	46.55%
Postfix	279,605	24.94%
Sendmail	125,783	11.22%
Microsoft	106,347	9.49%
MailEnable	34,407	3.07%
MDaemon	21,595	1.93%
IMail	7,975	0.71%
Lotus Domino	4,825	0.43%
WinWebMail	3,608	0.32%
CommuniGate Pro	3,297	0.29%
XMail	2,250	0.20%
Kerio	1,772	0.16%
Qmail Toaster	1,699	0.15%
Merak	1,342	0.12%
SurgeSMTP	1,127	0.10%
ArGoSoft	827	0.07%
GroupWise	565	0.05%
Post.Office	403	0.04%
Trend Micro	390	0.03%
Gordano Messaging Suite (GMS)	366	0.03%
MagicMail	327	0.03%
Mirapoint	179	0.02%
InterScan VirusWall	144	0.01%
VisNetic	144	0.01%
Mercury	54	0.00%
Interscan	54	0.00%
NetIQ MailMarshal	44	0.00%
WebSTAR V	32	0.00%
Neon Mail Server	27	0.00%
OpenSMTPD	20	0.00%
OpenVMS	19	0.00%
MessageWall	18	0.00%
ModusMail	14	0.00%
WebSTAR	14	0.00%
MAILsweeper	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (521,887 servers)
Version	Number of Servers	Percent
4.77	365,305	70.00%
4.76	49,790	9.54%
4.69	41,361	7.93%
4.72	25,645	4.91%
4.80	11,892	2.28%
4.67	6,447	1.24%
4.63	5,347	1.02%
Other	16,100	3.08%
Postfix (279,605 servers)
Version	Number of Servers	Percent
Other	279,605	100.00%
Sendmail (125,783 servers)
Version	Number of Servers	Percent
8.13.8	33,725	26.81%
8.13.1	19,621	15.60%
8.14.3	16,475	13.10%
8.14.5	13,180	10.48%
8.14.4	11,518	9.16%
8.12.11.20060308	4,939	3.93%
8.13.6.20060614	3,837	3.05%
8.14.2	3,588	2.85%
8.11.6	2,519	2.00%
8.12.10	2,229	1.77%
8.14.1	2,027	1.61%
8.13.6	1,853	1.47%
8.12.11.20060614	1,835	1.46%
8.13.7	1,605	1.28%
8.12.11	1,347	1.07%
Other	5,485	4.36%
Microsoft (106,347 servers)
Version	Number of Servers	Percent
6.0.3790.4675	85,211	80.13%
6.0.3790.3959	12,178	11.45%
6.0.3790.1830	3,335	3.14%
7.5.7601.17514	1,575	1.48%
5.0.2195.7381	1,178	1.11%
Other	2,870	2.70%
MailEnable (34,407 servers)
Version	Number of Servers	Percent
1.986--	7,753	22.53%
5.10--	2,723	7.91%
4.26--	2,436	7.08%
1.981--	1,389	4.04%
6.0--	1,316	3.82%
6.5--	974	2.83%
1.983--	874	2.54%
6.03--	762	2.21%
0-3.63-	736	2.14%
5.51--	660	1.92%
3.62--	651	1.89%
5.11--	578	1.68%
6.53--	541	1.57%
0-1.87-	384	1.12%
0-4.26-	378	1.10%
4.22--	359	1.04%
Other	11,893	34.57%
MDaemon (21,595 servers)
Version	Number of Servers	Percent
12.5.6	2,638	12.22%
11.0.3	2,462	11.40%
12.5.7	1,715	7.94%
11.0.0	1,368	6.33%
10.0.0	858	3.97%
12.5.4	846	3.92%
10.1.2	783	3.63%
10.1.1	699	3.24%
12.5.3	572	2.65%
9.6.1	538	2.49%
13.0.0	518	2.40%
12.0.3	511	2.37%
9.6.6	483	2.24%
10.1.0	447	2.07%
12.5.2	359	1.66%
12.0.4	358	1.66%
9.6.2	327	1.51%
9.5.2	310	1.44%
10.0.5	306	1.42%
9.6.5	297	1.38%
10.0.2	269	1.25%
9.5.1	259	1.20%
9.5.6	250	1.16%
9.6.4	234	1.08%
8.1.3	219	1.01%
Other	3,969	18.38%
IMail (7,975 servers)
Version	Number of Servers	Percent
8.22	1,444	18.11%
11.5	967	12.13%
12.1.0.270	750	9.40%
9.23	510	6.39%
8.15	478	5.99%
11.03	421	5.28%
11.01	410	5.14%
8.05	301	3.77%
12.0.0.384	243	3.05%
10.02	241	3.02%
11.0	219	2.75%
7.07	193	2.42%
11.02	166	2.08%
6.06	145	1.82%
12.0.0.348	139	1.74%
7.15	136	1.71%
10.01	134	1.68%
8.00	134	1.68%
9.21	92	1.15%
9.10	85	1.07%
Other	767	9.62%
Lotus Domino (4,825 servers)
Version	Number of Servers	Percent
8.5.3	810	16.79%
8.5.2	365	7.56%
8.5.2FP2	283	5.87%
8.5.3FP1	277	5.74%
8.5.1	240	4.97%
7.0.2	209	4.33%
8.5	174	3.61%
8.5.3FP2	167	3.46%
8.5.2FP3	166	3.44%
7.0.3	122	2.53%
8.5.2FP1	109	2.26%
8.5.2FP4	107	2.22%
7.0.1	101	2.09%
8.5.1FP5	99	2.05%
8.0.1	95	1.97%
8.0.2	89	1.84%
7.0	84	1.74%
6.5.4	84	1.74%
6.5.1	81	1.68%
6.5.3	79	1.64%
8.0	72	1.49%
6.5.5	58	1.20%
8.5.1FP3	51	1.06%
8.5.1FP4	51	1.06%
6.5	51	1.06%
7.0.3FP1	49	1.02%
Other	752	15.59%
WinWebMail (3,608 servers)
Version	Number of Servers	Percent
3.8.1.3	743	20.59%
3.8.0.1	503	13.94%
3.7.6.1	395	10.95%
3.8.1.5	357	9.89%
3.7.3.1	280	7.76%
3.8.2.1	276	7.65%
3.8.1.1	270	7.48%
3.7.7.3	266	7.37%
3.7.1.1	133	3.69%
3.7.5.1	100	2.77%
3.7.7.1	68	1.88%
3.6.3.1	60	1.66%
3.7.0.3	52	1.44%
3.7.0.5	45	1.25%
3.7.0.7	39	1.08%
Other	21	0.58%
CommuniGate Pro (3,297 servers)
Version	Number of Servers	Percent
5.1.16	269	8.16%
5.4.6	154	4.67%
5.4.5	151	4.58%
5.4.4	148	4.49%
4.1.8	140	4.25%
5.2.20	108	3.28%
5.3.13	94	2.85%
5.4.1	90	2.73%
5.4.7	84	2.55%
5.2.16	81	2.46%
4.2.10	78	2.37%
5.4.2	75	2.27%
5.2.3	68	2.06%
5.1.12	67	2.03%
5.0.14	64	1.94%
5.2.19	62	1.88%
5.4.3	60	1.82%
5.3.15	59	1.79%
5.2.14	52	1.58%
5.4.0	46	1.40%
5.2.12	45	1.36%
5.3.8	41	1.24%
5.3.9	40	1.21%
5.1.13	40	1.21%
5.4	38	1.15%
5.3.12	38	1.15%
5.3.10	38	1.15%
5.2.13	37	1.12%
5.2.8	34	1.03%
6.0	33	1.00%
Other	963	29.21%
XMail (2,250 servers)
Version	Number of Servers	Percent
1.27	582	25.87%
1.22	525	23.33%
1.25	393	17.47%
1.26	264	11.73%
1.24	183	8.13%
1.21	83	3.69%
1.23	51	2.27%
1.20	39	1.73%
1.17	35	1.56%
Other	95	4.22%
Kerio (1,772 servers)
Version	Number of Servers	Percent
6.7.3	271	15.29%
6.6.2	174	9.82%
6.7.0	165	9.31%
6.5.0	133	7.51%
6.5.2	122	6.88%
6.4.1	103	5.81%
6.7.2	101	5.70%
6.7.1	89	5.02%
6.3.1	82	4.63%
6.4.0	70	3.95%
6.5.1	63	3.56%
6.6.1	62	3.50%
6.6.0	60	3.39%
6.4.2	37	2.09%
6.3.0	34	1.92%
6.2.0	20	1.13%
6.0.10	20	1.13%
6.1.4	19	1.07%
Other	147	8.30%
Qmail Toaster (1,699 servers)
Version	Number of Servers	Percent
1.3	1,613	94.94%
1.2	53	3.12%
Other	33	1.94%
Merak (1,342 servers)
Version	Number of Servers	Percent
8.0.3	537	40.01%
8.9.1	147	10.95%
8.5.0	101	7.53%
7.5.2	61	4.55%
8.3.8	56	4.17%
7.6.4	55	4.10%
7.4.5	54	4.02%
9.0.0	26	1.94%
7.4.2	24	1.79%
8.9.0	19	1.42%
7.2.0	18	1.34%
8.2.4	18	1.34%
7.0.1	18	1.34%
7.6.1	18	1.34%
6.2.1	16	1.19%
4.4.2	16	1.19%
8.3.15	14	1.04%
Other	144	10.73%
SurgeSMTP (1,127 servers)
Version	Number of Servers	Percent
6.1c-1	218	19.34%
5.3h2-2	161	14.29%
5.2a-1	116	10.29%
3.9e-1	68	6.03%
6.0a5-5	64	5.68%
6.0a4-4	36	3.19%
3.8k4-4	32	2.84%
4.0u4-4	29	2.57%
5.0e4-4	23	2.04%
4.2d2-2	19	1.69%
4.3g2-2	18	1.60%
5.3h-1	16	1.42%
3.9h-18	15	1.33%
3.8i3-3	15	1.33%
5.0e3-3	15	1.33%
4.2d4-4	13	1.15%
3.7b8-8	12	1.06%
4.3g4-4	12	1.06%
3.6f5-5	12	1.06%
6.0a3-3	12	1.06%
Other	221	19.61%
ArGoSoft (827 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	196	23.70%
1.8 (1.8.9.5)	120	14.51%
1.8 (1.8.9.3)	107	12.94%
1.8 (1.8.9.1)	80	9.67%
1.8 (1.8.8.8)	57	6.89%
1.8 (1.8.8.7)	51	6.17%
1.8 (1.8.9.2)	31	3.75%
1.8 (1.8.9.4)	24	2.90%
1.8 (1.8.6.0)	17	2.06%
1.8 (1.8.8.9)	13	1.57%
1.8 (1.8.8.1)	13	1.57%
1.8 (1.8.8.2)	9	1.09%
Other	109	13.18%
GroupWise (565 servers)
Version	Number of Servers	Percent
8.0.2	115	20.35%
7.0.3	109	19.29%
6.5.7	64	11.33%
7.0.4	42	7.43%
7.0.2	41	7.26%
6.5.4	23	4.07%
8.0.1	22	3.89%
6.5.6	21	3.72%
7.0.1	19	3.36%
6.5.1	19	3.36%
12.0.0	18	3.19%
6.0.4	17	3.01%
8.0.0	11	1.95%
7.0	9	1.59%
6.5.5	7	1.24%
Other	28	4.96%
Post.Office (403 servers)
Version	Number of Servers	Percent
3.5.3	58	14.39%
4.1.0.2	36	8.93%
4.1.2.4	31	7.69%
4.0.1	29	7.20%
4.1.1	19	4.71%
3.9.2.3	17	4.22%
3.8.3	14	3.47%
3.5.3J	13	3.23%
4.2	12	2.98%
3.9.2	11	2.73%
3.1.2	10	2.48%
4.1.0.3	10	2.48%
3.1.2J	10	2.48%
4.0.1.1	9	2.23%
3.8.7.4	9	2.23%
3.6.2	8	1.99%
4.1.0.4	8	1.99%
4.1.2.3	7	1.74%
4.2.1.1	7	1.74%
3.9.1.2	6	1.49%
4.2.1	6	1.49%
4.1.2.2	6	1.49%
3.9.1	6	1.49%
3.9.1.3	5	1.24%
4.0.0.1	5	1.24%
Other	51	12.66%
Trend Micro (390 servers)
Version	Number of Servers	Percent
5.7	148	37.95%
5.5	103	26.41%
5.18	70	17.95%
7.0	35	8.97%
7.1	22	5.64%
Other	12	3.08%
Gordano Messaging Suite (GMS) (366 servers)
Version	Number of Servers	Percent
Other	366	100.00%
MagicMail (327 servers)
Version	Number of Servers	Percent
Other	327	100.00%
Mirapoint (179 servers)
Version	Number of Servers	Percent
3.10.10a-GA	22	12.29%
4.2.3-GA	16	8.94%
4.1.10-GA	14	7.82%
3.10.5-GA	10	5.59%
4.1.3-GA	9	5.03%
4.1.9-GA	9	5.03%
3.10.9-GA	9	5.03%
3.10.8-GA	8	4.47%
4.3.3-GA	7	3.91%
3.8.3-GA	7	3.91%
3.8.4-GA	7	3.91%
4.3.5-GA	7	3.91%
4.1.4-GA	6	3.35%
3.10.7-GA	5	2.79%
4.2.4-GA	5	2.79%
3.8.5-GA	4	2.23%
4.1.8-GA	4	2.23%
3.8.6-GA	3	1.68%
3.10.4-GA	3	1.68%
3.8.7a	3	1.68%
3.7.5a-GA	3	1.68%
4.3.4-GA	3	1.68%
4.1.5-GA	3	1.68%
3.10.3-GA	2	1.12%
4.0.5a	2	1.12%
Other	8	4.47%
InterScan VirusWall (144 servers)
Version	Number of Servers	Percent
Other	144	100.00%
VisNetic (144 servers)
Version	Number of Servers	Percent
9.3.2.0	41	28.47%
9.1.4.1	19	13.19%
8.5.0.8	10	6.94%
5.5.8.3	8	5.56%
5.8.6.6	7	4.86%
8.0.3.1	6	4.17%
7.6.1.0	6	4.17%
8.0.3	5	3.47%
6.2.2.0	4	2.78%
8.0.3.0	4	2.78%
5.3.5.0	4	2.78%
7.2.4.1	3	2.08%
9.1.4.0	3	2.08%
5.0.2.3	3	2.08%
5.4.5.4	3	2.08%
8.3.5.0	2	1.39%
5.0.2.1	2	1.39%
6.0.9.0	2	1.39%
Other	12	8.33%
Mercury (54 servers)
Version	Number of Servers	Percent
1.48	29	53.70%
3.32	15	27.78%
3.01a	2	3.70%
1.47	2	3.70%
3.21c	2	3.70%
3.21	1	1.85%
1.44	1	1.85%
4.x	1	1.85%
3.30	1	1.85%
Other	0	0.00%
Interscan (54 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	12	22.22%
3.81-Build_1022	10	18.52%
3.55 (build 1029)	7	12.96%
3.8-Build_3013	4	7.41%
3.53 (build 2011)	4	7.41%
3.53 (build 1493)	3	5.56%
3.53 (build 2017)	3	5.56%
3.81-Build_1084	3	5.56%
3.53 (build 2013)	2	3.70%
3.81-Build_1055	1	1.85%
3.5 (build 1294)	1	1.85%
3.51 (build 1337)	1	1.85%
3.55 (build 1020)	1	1.85%
3.8-Build_3045	1	1.85%
3.8-Build_1080	1	1.85%
Other	0	0.00%
NetIQ MailMarshal (44 servers)
Version	Number of Servers	Percent
6.0.3.8	30	68.18%
5.5.6.7	4	9.09%
6.1.3.15	3	6.82%
5.5.6.5	2	4.55%
5.5.6.6	2	4.55%
5.5.5.6	1	2.27%
5.5.4.17	1	2.27%
5.5.4.16	1	2.27%
Other	0	0.00%
WebSTAR V (32 servers)
Version	Number of Servers	Percent
5.4.1	15	46.88%
5.4.0	9	28.12%
5.3.3	3	9.38%
5.3.4	3	9.38%
5.3.2	2	6.25%
Other	0	0.00%
Neon Mail Server (27 servers)
Version	Number of Servers	Percent
3.0.7	7	25.93%
3.1.3	5	18.52%
3.1.0	4	14.81%
3.1.4	3	11.11%
3.1.2	3	11.11%
3.0.9	2	7.41%
3.1.1	1	3.70%
3.1.5	1	3.70%
3.0.6	1	3.70%
Other	0	0.00%
OpenSMTPD (20 servers)
Version	Number of Servers	Percent
Other	20	100.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	8	42.11%
8.4	6	31.58%
7.3	3	15.79%
6.1	1	5.26%
8.2	1	5.26%
Other	0	0.00%
MessageWall (18 servers)
Version	Number of Servers	Percent
1.0.8	17	94.44%
1.0.6	1	5.56%
Other	0	0.00%
ModusMail (14 servers)
Version	Number of Servers	Percent
4.35.477.0	6	42.86%
4.35.480.0	2	14.29%
4.1.361.21	1	7.14%
3.2.315.0	1	7.14%
4.0.340.3	1	7.14%
4.3.459.0	1	7.14%
4.35.477.8	1	7.14%
3.1.302.0	1	7.14%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
MAILsweeper (5 servers)
Version	Number of Servers	Percent
4.3.17.0	2	40.00%
4.3.19.0	2	40.00%
4.3.20.0	1	20.00%
Other	0	0.00%