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	1,621,765	100.0%
Number of Servers that didn't respond	217,866	13.43%
Server didn't open socket	210,613	12.99%
Server didn't provide banner	7,253	0.45%
Server provided banner	1,403,899	86.57%
Server banner identifies software in use	896,999	55.31%

As indicated by the above table, of the 1,621,765 servers queried, only 896,999 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
Sendmail	307,682	34.30%
Microsoft	181,409	20.22%
Exim	149,777	16.70%
Postfix	108,999	12.15%
IMail	49,584	5.53%
MDaemon	20,748	2.31%
MailEnable	16,782	1.87%
Lotus Domino	9,279	1.03%
Merak	8,542	0.95%
CommuniGate Pro	5,710	0.64%
GroupWise	5,031	0.56%
Trend Micro	4,732	0.53%
WinWebMail	3,754	0.42%
Kerio	3,579	0.40%
ArGoSoft	3,245	0.36%
XMail	2,313	0.26%
NetIQ MailMarshal	2,187	0.24%
Gordano Messaging Suite (GMS)	1,915	0.21%
Interscan	1,728	0.19%
SurgeSMTP	1,578	0.18%
Post.Office	1,519	0.17%
InterScan VirusWall	1,381	0.15%
ModusMail	1,328	0.15%
Qmail Toaster	918	0.10%
VisNetic	771	0.09%
MAILsweeper	542	0.06%
Mercury	456	0.05%
Mirapoint	444	0.05%
WebSTAR V	394	0.04%
MessageWall	195	0.02%
WebSTAR	188	0.02%
Neon Mail Server	153	0.02%
MagicMail	99	0.01%
OpenVMS	37	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (307,682 servers)
Version	Number of Servers	Percent
8.12.11.20060614	54,510	17.72%
8.11.6	51,754	16.82%
8.13.6	35,988	11.70%
8.12.10	27,722	9.01%
8.12.11.20060308	24,487	7.96%
8.13.1	17,934	5.83%
8.12.11	16,905	5.49%
8.12.8	13,302	4.32%
8.13.4	12,085	3.93%
8.10.2	9,485	3.08%
8.13.6.20060614	8,574	2.79%
8.9.3	8,536	2.77%
8.13.3	3,809	1.24%
8.13.7	3,750	1.22%
8.12.9	3,524	1.15%
Other	15,317	4.98%
Microsoft (181,409 servers)
Version	Number of Servers	Percent
6.0.3790.1830	99,499	54.85%
5.0.2195.6713	44,302	24.42%
6.0.3790.211	23,224	12.80%
5.5.2653.13	4,164	2.30%
6.0.3790.0	3,886	2.14%
Other	6,334	3.49%
Exim (149,777 servers)
Version	Number of Servers	Percent
4.52	109,592	73.17%
4.50	10,443	6.97%
4.60	5,898	3.94%
4.62	4,513	3.01%
4.44	3,389	2.26%
3.36	2,089	1.39%
4.43	2,088	1.39%
3.35	1,672	1.12%
4.42	1,562	1.04%
Other	8,531	5.70%
Postfix (108,999 servers)
Version	Number of Servers	Percent
Other	108,999	100.00%
IMail (49,584 servers)
Version	Number of Servers	Percent
8.15	14,294	28.83%
6.06	6,015	12.13%
8.05	5,793	11.68%
8.22	4,501	9.08%
8.21	3,353	6.76%
7.15	2,069	4.17%
7.07	1,954	3.94%
9.04	1,751	3.53%
8.20	1,120	2.26%
8.10	851	1.72%
8.14	720	1.45%
8.00	711	1.43%
9.03	586	1.18%
8.12	537	1.08%
8.13	534	1.08%
8.02	532	1.07%
Other	4,263	8.60%
MDaemon (20,748 servers)
Version	Number of Servers	Percent
8.1.3	2,494	12.02%
9.0.5	1,679	8.09%
9.0.4	1,560	7.52%
9.0.1	1,446	6.97%
6.8.5	1,339	6.45%
8.1.4	1,302	6.28%
7.2.3	1,118	5.39%
9.0.0	1,033	4.98%
7.2.0	980	4.72%
8.0.2	752	3.62%
8.1.5	670	3.23%
8.1.1	595	2.87%
8.0.3	511	2.46%
7.1.2	488	2.35%
7.1.0	488	2.35%
7.2.2	446	2.15%
6.8.4	433	2.09%
7.2.1	392	1.89%
8.0.1	385	1.86%
7.0.1	384	1.85%
8.1.2	209	1.01%
Other	2,044	9.85%
MailEnable (16,782 servers)
Version	Number of Servers	Percent
1.8--	3,122	18.60%
1.9--	2,217	13.21%
1.95--	1,335	7.95%
0-1.75-	1,229	7.32%
0-1.54-	855	5.09%
0-1.6-	689	4.11%
1.96--	496	2.96%
1.73--	477	2.84%
0-1.72-	409	2.44%
0-1.71-	399	2.38%
1.91--	371	2.21%
1.71--	321	1.91%
1.92--	313	1.87%
0-2.11-	276	1.64%
0--1.23	222	1.32%
0-1.79-	215	1.28%
0--1.1	187	1.11%
Other	3,649	21.74%
Lotus Domino (9,279 servers)
Version	Number of Servers	Percent
6.5.4	1,026	11.06%
6.5.1	986	10.63%
6.5.3	710	7.65%
7.0.1	701	7.55%
7.0	543	5.85%
6.5	529	5.70%
6.5.5	489	5.27%
5.0.11	462	4.98%
6.5.2	437	4.71%
5.0.12	322	3.47%
5.0.8	272	2.93%
6.5.4FP2	268	2.89%
5.0.10	229	2.47%
5.0.13a	205	2.21%
6.5.4FP1	194	2.09%
6.0.2CF1	189	2.04%
6.0.3	180	1.94%
6.0	143	1.54%
5.0.9	137	1.48%
5.0.5	106	1.14%
6.5.3FP1	105	1.13%
6.0.1	97	1.05%
5.0.6a	94	1.01%
Other	855	9.21%
Merak (8,542 servers)
Version	Number of Servers	Percent
8.0.3	1,820	21.31%
8.3.8	1,428	16.72%
8.5.0	1,051	12.30%
7.4.5	513	6.01%
7.6.4	403	4.72%
7.5.2	395	4.62%
8.2.4	325	3.80%
7.4.2	255	2.99%
7.2.0	216	2.53%
8.3.0	180	2.11%
6.2.1	173	2.03%
4.4.2	131	1.53%
7.4.0	124	1.45%
7.6.1	106	1.24%
5.9.4	97	1.14%
8.3.6	92	1.08%
5.5.7	92	1.08%
5.8.6	88	1.03%
Other	1,053	12.33%
CommuniGate Pro (5,710 servers)
Version	Number of Servers	Percent
4.1.8	926	16.22%
5.0.9	611	10.70%
4.2.10	579	10.14%
5.0.8	281	4.92%
4.2.4	259	4.54%
4.2.8	216	3.78%
4.3.8	188	3.29%
4.2	185	3.24%
4.2.7	170	2.98%
4.2.9	151	2.64%
4.0.6	146	2.56%
5.0.6	136	2.38%
4.3.6	133	2.33%
3.5.9	112	1.96%
4.0.1	94	1.65%
5.0.1	81	1.42%
4.3.9	80	1.40%
4.3.4	76	1.33%
5.0.2	76	1.33%
4.2.5	74	1.30%
4.2.3	73	1.28%
4.3.7	71	1.24%
5.0.7	66	1.16%
4.1.3	65	1.14%
4.2.6	64	1.12%
4.0.5	59	1.03%
4.3.10	59	1.03%
4.1.6	59	1.03%
Other	620	10.86%
GroupWise (5,031 servers)
Version	Number of Servers	Percent
6.5.4	1,008	20.04%
7.0	651	12.94%
6.5.5	507	10.08%
6.0.4	471	9.36%
7.0.1	383	7.61%
6.5.1	349	6.94%
6.5.6	333	6.62%
6.5.2	234	4.65%
6.5.3	218	4.33%
6.0.2	158	3.14%
6.0.3	144	2.86%
6.5.0	135	2.68%
5.5.5	129	2.56%
6.0.1	94	1.87%
Other	217	4.31%
Trend Micro (4,732 servers)
Version	Number of Servers	Percent
5.5	3,337	70.52%
5.7	845	17.86%
5.18	468	9.89%
5.15	56	1.18%
Other	26	0.55%
WinWebMail (3,754 servers)
Version	Number of Servers	Percent
3.6.3.1	1,205	32.10%
3.7.1.1	726	19.34%
3.7.0.5	702	18.70%
3.7.0.7	607	16.17%
3.7.0.3	456	12.15%
3.7.0.1	42	1.12%
Other	16	0.43%
Kerio (3,579 servers)
Version	Number of Servers	Percent
6.1.4	909	25.40%
6.1.3	567	15.84%
6.1.2	398	11.12%
6.1.0	269	7.52%
6.0.10	201	5.62%
6.1.1	196	5.48%
6.0.3	124	3.46%
6.0.8	97	2.71%
5.7.10	89	2.49%
6.0.6	81	2.26%
6.0.9	70	1.96%
6.0.7	62	1.73%
5.7.9	50	1.40%
5.7.4	45	1.26%
6.0.1	36	1.01%
6.0.4	36	1.01%
Other	349	9.75%
ArGoSoft (3,245 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	1,191	36.70%
1.8 (1.8.8.1)	202	6.22%
1.8 (1.8.6.0)	146	4.50%
1.8 (1.8.8.5)	141	4.35%
1.8 (1.8.8.3)	136	4.19%
1.8 (1.8.8.4)	132	4.07%
1.8 (1.8.8.2)	129	3.98%
1.8 (1.8.8.6)	106	3.27%
1.8 (1.8.7.5)	85	2.62%
1.8 (1.8.5.9)	64	1.97%
1.8 (1.8.7.6)	56	1.73%
1.8 (1.8.7.7)	51	1.57%
1.8 (1.8.6.6)	50	1.54%
1.8 (1.8.7.3)	46	1.42%
1.8 (1.8.8.0)	36	1.11%
Other	674	20.77%
XMail (2,313 servers)
Version	Number of Servers	Percent
1.22	815	35.24%
1.21	593	25.64%
1.20	283	12.24%
1.17	232	10.03%
1.18	89	3.85%
1.12	70	3.03%
1.16	48	2.08%
1.10	42	1.82%
1.11	34	1.47%
1.15	30	1.30%
Other	77	3.33%
NetIQ MailMarshal (2,187 servers)
Version	Number of Servers	Percent
6.0.3.8	1,550	70.87%
5.5.6.7	188	8.60%
6.1.3.15	103	4.71%
5.5.4.16	69	3.16%
5.5.5.9	64	2.93%
5.5.6.6	48	2.19%
5.5.6.5	39	1.78%
5.5.5.6	28	1.28%
5.5.4.17	28	1.28%
Other	70	3.20%
Gordano Messaging Suite (GMS) (1,915 servers)
Version	Number of Servers	Percent
Other	1,915	100.00%
Interscan (1,728 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	428	24.77%
3.81-Build_1022	209	12.09%
3.53 (build 2011)	171	9.90%
3.55 (build 1029)	152	8.80%
3.8-Build_3013	140	8.10%
3.53 (build 2017)	125	7.23%
3.53 (build 2013)	93	5.38%
3.52 (build 1375)	72	4.17%
3.53 (build 1493)	46	2.66%
3.8-Build_1080	34	1.97%
3.55 (build 1020)	30	1.74%
3.81-Build_1032	24	1.39%
3.55 (build 1018)	22	1.27%
3.81-Build_1021	20	1.16%
3.81-Build_1055	18	1.04%
3.8-Build_3065	18	1.04%
Other	126	7.29%
SurgeSMTP (1,578 servers)
Version	Number of Servers	Percent
3.7b8-8	465	29.47%
3.6f5-5	264	16.73%
3.7b6-6	172	10.90%
3.0c2-2	143	9.06%
3.5b3-3	140	8.87%
2.1c7-7	42	2.66%
1.6e2	26	1.65%
3.6f3-3	24	1.52%
2.0g2-1	23	1.46%
2.2c10-10	22	1.39%
1.8g3	20	1.27%
1.5c	16	1.01%
Other	221	14.01%
Post.Office (1,519 servers)
Version	Number of Servers	Percent
3.5.3	590	38.84%
3.5.3J	159	10.47%
3.8.3	78	5.13%
3.6.3	78	5.13%
3.6.2	62	4.08%
3.1.2J	51	3.36%
3.1.2	50	3.29%
3.9.1	43	2.83%
3.8.4	40	2.63%
3.5.2	39	2.57%
3.9.2	30	1.97%
3.6.0	29	1.91%
3.9.0	28	1.84%
4.0.0.2	24	1.58%
3.6	18	1.18%
4.0.0.1	17	1.12%
3.9.1.3	16	1.05%
Other	167	10.99%
InterScan VirusWall (1,381 servers)
Version	Number of Servers	Percent
Other	1,381	100.00%
ModusMail (1,328 servers)
Version	Number of Servers	Percent
4.35.477.0	717	53.99%
4.3.459.0	219	16.49%
4.1.361.21	67	5.05%
3.2.315.0	57	4.29%
4.2.425.16	44	3.31%
4.2.425.22	29	2.18%
3.1.302.0	27	2.03%
4.2.407.0	26	1.96%
4.1.361.0	23	1.73%
4.2.425.4	20	1.51%
3.1.297.0	16	1.20%
Other	83	6.25%
Qmail Toaster (918 servers)
Version	Number of Servers	Percent
1.2	667	72.66%
1.0	162	17.65%
1.3	88	9.59%
Other	1	0.11%
VisNetic (771 servers)
Version	Number of Servers	Percent
8.3.5.0	119	15.43%
7.2.4.1	80	10.38%
8.0.3.0	75	9.73%
7.6.1.0	50	6.49%
8.3.6	49	6.36%
5.0.2.3	48	6.23%
6.2.2.0	47	6.10%
8.0.3.1	44	5.71%
5.8.6.6	43	5.58%
5.5.8.3	31	4.02%
8.0.3	23	2.98%
7.5.3.0	22	2.85%
5.4.5.4	22	2.85%
5.8.6.4	16	2.08%
5.3.5.0	14	1.82%
8.3.0.1	13	1.69%
5.0.1	12	1.56%
6.0.9.0	10	1.30%
7.2.4.0	10	1.30%
Other	43	5.58%
MAILsweeper (542 servers)
Version	Number of Servers	Percent
4.3.12.0	102	18.82%
4.3.14.0	94	17.34%
4.3.19.0	94	17.34%
4.3.17.0	93	17.16%
4.2.10.0	30	5.54%
4.3.1.0	29	5.35%
4.2.5.0	23	4.24%
4.3.10.0	20	3.69%
4.3.6.0	18	3.32%
4.2.1.0	16	2.95%
4.3.20.0	16	2.95%
Other	7	1.29%
Mercury (456 servers)
Version	Number of Servers	Percent
1.48	205	44.96%
3.32	149	32.68%
3.21c	36	7.89%
3.31	23	5.04%
1.44	16	3.51%
1.47	11	2.41%
3.01a	8	1.75%
Other	8	1.75%
Mirapoint (444 servers)
Version	Number of Servers	Percent
3.7.3a-GA	66	14.86%
3.7.5-GA	46	10.36%
3.7.4b-GA	46	10.36%
3.7.1-GA	34	7.66%
3.7.2-GA	31	6.98%
3.7.5a-GA	28	6.31%
3.5.8-GR	28	6.31%
3.8.0-FCS	26	5.86%
3.7.3-GA	14	3.15%
3.7.0-GA	14	3.15%
3.5.9-GR	13	2.93%
3.6.5-GR	13	2.93%
1.1.0	10	2.25%
3.6.6-GR	9	2.03%
3.6.4-CR	8	1.80%
3.5.7-GR	6	1.35%
3.5.6-GR	5	1.13%
Other	47	10.59%
WebSTAR V (394 servers)
Version	Number of Servers	Percent
5.4.0	117	29.70%
5.4.1	107	27.16%
5.3.4	90	22.84%
5.3.3	35	8.88%
5.3.2	27	6.85%
5.3.0	8	2.03%
5.2.4	5	1.27%
5.3.1	5	1.27%
Other	0	0.00%
MessageWall (195 servers)
Version	Number of Servers	Percent
1.0.8	155	79.49%
1.0.11	18	9.23%
1.1.23	7	3.59%
1.0.6	5	2.56%
1.1.0	4	2.05%
1.0.9	2	1.03%
Other	4	2.05%
WebSTAR (188 servers)
Version	Number of Servers	Percent
Other	188	100.00%
Neon Mail Server (153 servers)
Version	Number of Servers	Percent
3.0.7	89	58.17%
3.0.9	39	25.49%
3.0.8	13	8.50%
3.0.6	7	4.58%
3.0.4	2	1.31%
3.0.5	2	1.31%
Other	1	0.65%
MagicMail (99 servers)
Version	Number of Servers	Percent
Other	99	100.00%
OpenVMS (37 servers)
Version	Number of Servers	Percent
7.3	16	43.24%
8.2	9	24.32%
7.2	9	24.32%
7.1	2	5.41%
6.1	1	2.70%
Other	0	0.00%