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	1,772,491	100.0%
Number of Servers that didn't respond	285,113	16.09%
Server didn't open socket	273,932	15.45%
Server didn't provide banner	11,181	0.63%
Server provided banner	1,487,378	83.91%
Server banner identifies software in use	885,814	49.98%

As indicated by the above table, of the 1,772,491 servers queried, only 885,814 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	234,272	26.45%
Microsoft	197,822	22.33%
Exim	191,346	21.60%
Postfix	140,754	15.89%
IMail	26,965	3.04%
MDaemon	22,021	2.49%
MailEnable	21,989	2.48%
Lotus Domino	7,037	0.79%
Merak	6,704	0.76%
Kerio	5,126	0.58%
CommuniGate Pro	4,935	0.56%
WinWebMail	4,301	0.49%
Trend Micro	3,638	0.41%
GroupWise	3,177	0.36%
ArGoSoft	2,759	0.31%
XMail	2,589	0.29%
SurgeSMTP	1,830	0.21%
Qmail Toaster	1,552	0.18%
Gordano Messaging Suite (GMS)	1,137	0.13%
Post.Office	1,008	0.11%
NetIQ MailMarshal	786	0.09%
InterScan VirusWall	783	0.09%
Interscan	628	0.07%
Mirapoint	572	0.06%
VisNetic	538	0.06%
MagicMail	356	0.04%
ModusMail	240	0.03%
WebSTAR V	229	0.03%
Mercury	213	0.02%
Neon Mail Server	175	0.02%
MAILsweeper	105	0.01%
MessageWall	100	0.01%
WebSTAR	89	0.01%
OpenVMS	38	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (234,272 servers)
Version	Number of Servers	Percent
8.12.11.20060308	30,230	12.90%
8.12.11.20060614	27,606	11.78%
8.13.1	27,225	11.62%
8.13.6	23,533	10.05%
8.11.6	22,143	9.45%
8.12.10	15,923	6.80%
8.13.8	15,298	6.53%
8.13.6.20060614	10,361	4.42%
8.14.1	9,567	4.08%
8.12.11	9,496	4.05%
8.13.4	7,992	3.41%
8.12.8	6,931	2.96%
8.13.7	5,986	2.56%
8.9.3	3,997	1.71%
8.10.2	3,709	1.58%
Other	14,275	6.09%
Microsoft (197,822 servers)
Version	Number of Servers	Percent
6.0.3790.3959	107,111	54.15%
6.0.3790.1830	54,897	27.75%
5.0.2195.6713	21,665	10.95%
6.0.3790.211	8,793	4.44%
Other	5,356	2.71%
Exim (191,346 servers)
Version	Number of Servers	Percent
4.68	116,565	60.92%
4.63	32,572	17.02%
4.66	7,756	4.05%
4.50	7,626	3.99%
4.60	7,188	3.76%
4.67	4,223	2.21%
4.62	3,878	2.03%
4.52	2,448	1.28%
Other	9,090	4.75%
Postfix (140,754 servers)
Version	Number of Servers	Percent
Other	140,754	100.00%
IMail (26,965 servers)
Version	Number of Servers	Percent
8.22	5,400	20.03%
8.15	4,682	17.36%
8.05	2,420	8.97%
9.21	1,929	7.15%
9.10	1,627	6.03%
9.22	1,386	5.14%
7.07	1,131	4.19%
7.15	1,045	3.88%
9.20	999	3.70%
6.06	808	3.00%
8.00	595	2.21%
9.23	568	2.11%
8.21	529	1.96%
8.20	384	1.42%
8.04	337	1.25%
8.10	314	1.16%
8.12	284	1.05%
Other	2,527	9.37%
MDaemon (22,021 servers)
Version	Number of Servers	Percent
9.6.3	4,240	19.25%
9.6.2	2,637	11.97%
9.5.6	1,294	5.88%
9.6.1	1,199	5.44%
8.1.3	1,098	4.99%
9.0.4	1,039	4.72%
9.5.2	685	3.11%
6.8.5	683	3.10%
9.5.1	679	3.08%
7.2.3	591	2.68%
7.2.0	495	2.25%
9.0.1	477	2.17%
9.5.5	415	1.88%
9.0.0	406	1.84%
8.1.4	395	1.79%
9.5.4	390	1.77%
8.0.2	371	1.68%
9.6.0	347	1.58%
8.1.1	334	1.52%
9.5.3	295	1.34%
8.0.3	275	1.25%
7.1.2	271	1.23%
8.1.5	266	1.21%
9.0.7	242	1.10%
7.1.0	228	1.04%
7.2.2	226	1.03%
Other	2,443	11.09%
MailEnable (21,989 servers)
Version	Number of Servers	Percent
1.981--	5,185	23.58%
1.96--	1,836	8.35%
1.983--	1,638	7.45%
1.95--	1,547	7.04%
1.9--	1,389	6.32%
1.8--	1,231	5.60%
0-2.37-	1,043	4.74%
0-1.85-	1,001	4.55%
0-2.38-	684	3.11%
0-2.36-	501	2.28%
0--2.37	445	2.02%
0-3.04-	408	1.86%
0--2.38	385	1.75%
0-2.40-	332	1.51%
0--3.04	249	1.13%
0-1.841-	241	1.10%
Other	3,874	17.62%
Lotus Domino (7,037 servers)
Version	Number of Servers	Percent
7.0.2	921	13.09%
7.0.2FP2	550	7.82%
6.5.4	501	7.12%
7.0.1	453	6.44%
6.5.1	430	6.11%
6.5.3	358	5.09%
6.5.5	338	4.80%
7.0	308	4.38%
7.0.2FP1	286	4.06%
8.0	278	3.95%
6.5	258	3.67%
5.0.11	195	2.77%
6.5.2	167	2.37%
7.0.3	160	2.27%
5.0.12	120	1.71%
5.0.10	107	1.52%
6.5.5FP2	100	1.42%
7.0.1FP1	97	1.38%
5.0.13a	95	1.35%
5.0.8	92	1.31%
6.5.6	90	1.28%
6.5.4FP2	81	1.15%
6.0.2CF1	81	1.15%
6.0.3	77	1.09%
6.5.4FP3	74	1.05%
6.5.6FP1	71	1.01%
Other	749	10.64%
Merak (6,704 servers)
Version	Number of Servers	Percent
8.0.3	1,990	29.68%
8.9.1	1,067	15.92%
8.5.0	530	7.91%
7.4.5	316	4.71%
8.3.8	288	4.30%
7.5.2	281	4.19%
9.0.0	273	4.07%
7.6.4	272	4.06%
7.4.2	162	2.42%
7.2.0	122	1.82%
8.2.4	105	1.57%
8.9.0	103	1.54%
6.2.1	91	1.36%
8.3.0	79	1.18%
7.4.0	73	1.09%
7.6.1	72	1.07%
Other	880	13.13%
Kerio (5,126 servers)
Version	Number of Servers	Percent
6.4.1	1,495	29.17%
6.3.1	863	16.84%
6.4.0	678	13.23%
6.4.2	446	8.70%
6.3.0	278	5.42%
6.2.2	125	2.44%
6.1.3	115	2.24%
6.1.2	112	2.18%
6.2.0	107	2.09%
6.1.0	106	2.07%
6.0.10	93	1.81%
6.1.4	92	1.79%
6.0.3	73	1.42%
6.1.1	56	1.09%
Other	487	9.50%
CommuniGate Pro (4,935 servers)
Version	Number of Servers	Percent
4.1.8	550	11.14%
5.1.12	372	7.54%
4.2.10	360	7.29%
5.1.13	300	6.08%
5.1.10	210	4.26%
5.1.11	192	3.89%
5.0.9	187	3.79%
5.0.13	179	3.63%
5.1.9	148	3.00%
5.1.8	133	2.70%
5.1.7	125	2.53%
4.2.8	109	2.21%
5.2	104	2.11%
4.3.12	96	1.95%
4.2.7	92	1.86%
4.2	87	1.76%
5.0.11	85	1.72%
5.0.8	81	1.64%
5.1.5	80	1.62%
4.2.9	79	1.60%
4.0.6	69	1.40%
5.1.3	64	1.30%
5.1.6	58	1.18%
5.1.2	57	1.16%
4.3.8	54	1.09%
3.5.9	51	1.03%
Other	1,013	20.53%
WinWebMail (4,301 servers)
Version	Number of Servers	Percent
3.7.3.1	1,527	35.50%
3.7.1.1	852	19.81%
3.6.3.1	524	12.18%
3.7.5.1	415	9.65%
3.7.0.5	407	9.46%
3.7.0.7	274	6.37%
3.7.0.3	250	5.81%
Other	52	1.21%
Trend Micro (3,638 servers)
Version	Number of Servers	Percent
5.7	1,647	45.27%
5.5	1,423	39.11%
5.18	443	12.18%
7.0	67	1.84%
Other	58	1.59%
GroupWise (3,177 servers)
Version	Number of Servers	Percent
7.0.2	1,016	31.98%
7.0.1	498	15.68%
6.5.7	378	11.90%
6.5.4	253	7.96%
6.5.6	177	5.57%
6.0.4	162	5.10%
7.0	125	3.93%
6.5.5	122	3.84%
6.5.1	107	3.37%
6.0.2	51	1.61%
6.5.3	50	1.57%
6.5.2	48	1.51%
6.0.3	41	1.29%
5.5.5	35	1.10%
Other	114	3.59%
ArGoSoft (2,759 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	547	19.83%
1.8 (1.8.8.8)	365	13.23%
1.8 (1.8.9.3)	303	10.98%
1.8 (1.8.8.7)	297	10.76%
1.8 (1.8.9.2)	277	10.04%
1.8 (1.8.8.9)	141	5.11%
1.8 (1.8.9.0)	72	2.61%
1.8 (1.8.8.1)	63	2.28%
1.8 (1.8.8.2)	60	2.17%
1.8 (1.8.6.0)	57	2.07%
1.8 (1.8.8.3)	39	1.41%
1.8 (1.8.8.4)	35	1.27%
1.8 (1.8.5.9)	35	1.27%
1.8 (1.8.7.5)	30	1.09%
Other	438	15.88%
XMail (2,589 servers)
Version	Number of Servers	Percent
1.22	886	34.22%
1.24	625	24.14%
1.21	351	13.56%
1.20	146	5.64%
1.17	145	5.60%
1.23	137	5.29%
1.12	82	3.17%
1.16	43	1.66%
1.18	40	1.54%
1.25	31	1.20%
Other	103	3.98%
SurgeSMTP (1,830 servers)
Version	Number of Servers	Percent
3.8k4-4	567	30.98%
3.8i3-3	192	10.49%
3.7b8-8	166	9.07%
3.8f3-3	119	6.50%
3.8o-1	115	6.28%
3.6f5-5	93	5.08%
3.8f2-2	74	4.04%
3.5b3-3	60	3.28%
3.8k2-2	58	3.17%
3.0c2-2	51	2.79%
3.7b6-6	39	2.13%
3.8m-1	26	1.42%
3.8k-1	24	1.31%
3.8i-1	24	1.31%
2.1c7-7	19	1.04%
Other	203	11.09%
Qmail Toaster (1,552 servers)
Version	Number of Servers	Percent
1.3	1,100	70.88%
1.2	373	24.03%
1.0	79	5.09%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,137 servers)
Version	Number of Servers	Percent
Other	1,137	100.00%
Post.Office (1,008 servers)
Version	Number of Servers	Percent
3.5.3	270	26.79%
4.0.1	101	10.02%
3.5.3J	76	7.54%
3.8.3	62	6.15%
3.6.3	54	5.36%
3.6.2	42	4.17%
3.9.1	37	3.67%
3.1.2J	34	3.37%
3.9.2.3	30	2.98%
3.9.0	27	2.68%
3.9.2	27	2.68%
3.1.2	24	2.38%
3.8.4	22	2.18%
3.8.7.4	20	1.98%
3.5.2	17	1.69%
4.0.0.2	17	1.69%
3.8.2	14	1.39%
3.9.1.3	14	1.39%
3.6.0	14	1.39%
3.9.2.1	13	1.29%
4.0.0.1	13	1.29%
Other	80	7.94%
NetIQ MailMarshal (786 servers)
Version	Number of Servers	Percent
6.0.3.8	593	75.45%
5.5.6.7	48	6.11%
6.1.3.15	34	4.33%
5.5.6.6	20	2.54%
5.5.4.16	18	2.29%
5.5.5.9	16	2.04%
5.5.6.5	15	1.91%
5.5.5.6	11	1.40%
5.5.4.17	8	1.02%
Other	23	2.93%
InterScan VirusWall (783 servers)
Version	Number of Servers	Percent
Other	783	100.00%
Interscan (628 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	117	18.63%
3.81-Build_1022	76	12.10%
3.8-Build_3013	70	11.15%
3.53 (build 2017)	54	8.60%
3.55 (build 1029)	53	8.44%
3.53 (build 2011)	49	7.80%
3.81-Build_1084	44	7.01%
3.52 (build 1375)	22	3.50%
3.53 (build 1493)	22	3.50%
3.53 (build 2013)	22	3.50%
3.55 (build 1020)	20	3.18%
3.8-Build_1080	9	1.43%
3.81-Build_1055	8	1.27%
3.8-Build_3065	7	1.11%
3.81-Build_1021	7	1.11%
Other	48	7.64%
Mirapoint (572 servers)
Version	Number of Servers	Percent
3.8.3-GA	112	19.58%
3.8.4-GA	104	18.18%
3.8.5-GA	85	14.86%
3.7.5a-GA	64	11.19%
3.8.2-GA	46	8.04%
3.8.6-GA	28	4.90%
3.7.3a-GA	27	4.72%
3.7.4b-GA	25	4.37%
3.7.5-GA	13	2.27%
3.5.8-GR	9	1.57%
1.1.0	9	1.57%
3.7.2-GA	8	1.40%
3.7.1-GA	8	1.40%
3.7.3-GA	6	1.05%
Other	28	4.90%
VisNetic (538 servers)
Version	Number of Servers	Percent
8.5.0.8	80	14.87%
9.1.4.0	52	9.67%
7.2.4.1	36	6.69%
8.0.3.0	32	5.95%
5.8.6.6	31	5.76%
8.0.3.1	31	5.76%
6.2.2.0	30	5.58%
8.3.5.0	28	5.20%
5.5.8.3	24	4.46%
5.0.2.3	23	4.28%
7.6.1.0	19	3.53%
5.3.5.0	17	3.16%
8.3.6	14	2.60%
8.5.0.5	13	2.42%
8.0.3	13	2.42%
5.4.5.4	12	2.23%
7.5.3.0	11	2.04%
8.3.0.1	7	1.30%
5.8.6.4	6	1.12%
5.0.2.1	6	1.12%
7.2.4.0	6	1.12%
9.1.4.1	6	1.12%
Other	41	7.62%
MagicMail (356 servers)
Version	Number of Servers	Percent
Other	356	100.00%
ModusMail (240 servers)
Version	Number of Servers	Percent
4.35.480.0	81	33.75%
3.2.315.0	30	12.50%
4.1.361.21	25	10.42%
4.2.425.22	24	10.00%
4.35.477.0	18	7.50%
3.0.273.0	12	5.00%
3.1.302.0	10	4.17%
4.3.459.0	8	3.33%
4.35.480.11	7	2.92%
4.0.340.0	4	1.67%
4.2.420.0	3	1.25%
4.1.361.0	3	1.25%
Other	15	6.25%
WebSTAR V (229 servers)
Version	Number of Servers	Percent
5.4.0	73	31.88%
5.4.1	58	25.33%
5.3.4	51	22.27%
5.3.3	22	9.61%
5.3.2	16	6.99%
5.3.0	6	2.62%
Other	3	1.31%
Mercury (213 servers)
Version	Number of Servers	Percent
1.48	100	46.95%
3.32	70	32.86%
3.21c	17	7.98%
1.44	8	3.76%
1.47	6	2.82%
3.31	6	2.82%
Other	6	2.82%
Neon Mail Server (175 servers)
Version	Number of Servers	Percent
3.0.9	48	27.43%
3.0.7	48	27.43%
3.1.2	34	19.43%
3.1.0	28	16.00%
3.0.6	7	4.00%
3.0.8	5	2.86%
3.1.3	2	1.14%
3.0.5	2	1.14%
Other	1	0.57%
MAILsweeper (105 servers)
Version	Number of Servers	Percent
4.3.20.0	22	20.95%
4.3.17.0	17	16.19%
4.3.14.0	15	14.29%
4.3.12.0	12	11.43%
4.3.19.0	12	11.43%
4.2.10.0	8	7.62%
4.3.6.0	5	4.76%
4.3.1.0	5	4.76%
4.3.10.0	4	3.81%
4.2.5.0	3	2.86%
Other	2	1.90%
MessageWall (100 servers)
Version	Number of Servers	Percent
1.0.8	79	79.00%
1.0.11	17	17.00%
1.1.0	2	2.00%
1.0.6	2	2.00%
Other	0	0.00%
WebSTAR (89 servers)
Version	Number of Servers	Percent
Other	89	100.00%
OpenVMS (38 servers)
Version	Number of Servers	Percent
7.3	12	31.58%
8.2	10	26.32%
8.3	10	26.32%
7.2	5	13.16%
6.1	1	2.63%
Other	0	0.00%