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	1,806,257	100.0%
Number of Servers that didn't respond	284,287	15.74%
Server didn't open socket	273,133	15.12%
Server didn't provide banner	11,154	0.62%
Server provided banner	1,521,970	84.26%
Server banner identifies software in use	908,731	50.31%

As indicated by the above table, of the 1,806,257 servers queried, only 908,731 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	245,021	26.96%
Microsoft	201,695	22.20%
Exim	196,560	21.63%
Postfix	143,601	15.80%
IMail	26,729	2.94%
MailEnable	22,532	2.48%
MDaemon	22,242	2.45%
Lotus Domino	6,986	0.77%
Merak	6,504	0.72%
Kerio	5,264	0.58%
CommuniGate Pro	4,927	0.54%
WinWebMail	4,411	0.49%
Trend Micro	3,560	0.39%
GroupWise	3,135	0.34%
ArGoSoft	2,738	0.30%
XMail	2,593	0.29%
SurgeSMTP	1,815	0.20%
Qmail Toaster	1,583	0.17%
Gordano Messaging Suite (GMS)	1,069	0.12%
Post.Office	988	0.11%
NetIQ MailMarshal	775	0.09%
InterScan VirusWall	748	0.08%
Interscan	604	0.07%
Mirapoint	576	0.06%
VisNetic	535	0.06%
MagicMail	359	0.04%
ModusMail	240	0.03%
WebSTAR V	226	0.02%
Mercury	219	0.02%
Neon Mail Server	173	0.02%
MAILsweeper	104	0.01%
MessageWall	95	0.01%
WebSTAR	86	0.01%
OpenVMS	38	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (245,021 servers)
Version	Number of Servers	Percent
8.12.11.20060614	38,571	15.74%
8.12.11.20060308	29,742	12.14%
8.13.1	28,286	11.54%
8.13.6	23,616	9.64%
8.11.6	21,624	8.83%
8.13.8	15,728	6.42%
8.12.10	15,538	6.34%
8.13.6.20060614	10,520	4.29%
8.12.11	9,214	3.76%
8.14.1	9,146	3.73%
8.13.4	7,867	3.21%
8.12.8	6,653	2.72%
8.13.7	5,935	2.42%
8.9.3	3,854	1.57%
8.10.2	3,547	1.45%
8.14.2	2,815	1.15%
Other	12,365	5.05%
Microsoft (201,695 servers)
Version	Number of Servers	Percent
6.0.3790.3959	113,571	56.31%
6.0.3790.1830	53,216	26.38%
5.0.2195.6713	21,136	10.48%
6.0.3790.211	8,511	4.22%
Other	5,261	2.61%
Exim (196,560 servers)
Version	Number of Servers	Percent
4.68	122,766	62.46%
4.63	31,962	16.26%
4.66	7,462	3.80%
4.60	7,103	3.61%
4.50	6,710	3.41%
4.67	4,661	2.37%
4.62	4,035	2.05%
4.52	1,985	1.01%
Other	9,876	5.02%
Postfix (143,601 servers)
Version	Number of Servers	Percent
Other	143,601	100.00%
IMail (26,729 servers)
Version	Number of Servers	Percent
8.22	5,366	20.08%
8.15	5,169	19.34%
8.05	1,881	7.04%
9.10	1,555	5.82%
9.21	1,545	5.78%
9.23	1,406	5.26%
9.22	1,279	4.79%
7.07	1,071	4.01%
7.15	993	3.72%
9.20	928	3.47%
6.06	776	2.90%
8.00	589	2.20%
8.21	532	1.99%
8.20	379	1.42%
8.04	340	1.27%
8.10	302	1.13%
8.01	272	1.02%
Other	2,346	8.78%
MailEnable (22,532 servers)
Version	Number of Servers	Percent
1.981--	5,503	24.42%
1.983--	1,886	8.37%
1.96--	1,811	8.04%
1.95--	1,517	6.73%
1.9--	1,379	6.12%
1.8--	1,190	5.28%
0-1.85-	1,006	4.46%
0-2.37-	1,005	4.46%
0-2.38-	632	2.80%
0-3.04-	586	2.60%
0-2.36-	483	2.14%
0--2.37	409	1.82%
0--2.38	365	1.62%
0-2.40-	362	1.61%
0--3.04	360	1.60%
0-1.841-	241	1.07%
Other	3,797	16.85%
MDaemon (22,242 servers)
Version	Number of Servers	Percent
9.6.3	5,055	22.73%
9.6.2	2,273	10.22%
9.5.6	1,255	5.64%
9.6.1	1,221	5.49%
8.1.3	1,073	4.82%
9.0.4	1,016	4.57%
9.5.2	697	3.13%
9.5.1	694	3.12%
6.8.5	651	2.93%
7.2.3	583	2.62%
7.2.0	482	2.17%
9.0.1	474	2.13%
9.5.5	412	1.85%
9.0.0	397	1.78%
8.1.4	383	1.72%
9.5.4	375	1.69%
8.0.2	366	1.65%
9.6.0	327	1.47%
8.1.1	322	1.45%
9.5.3	287	1.29%
7.1.2	268	1.20%
8.0.3	266	1.20%
8.1.5	259	1.16%
9.0.7	234	1.05%
7.2.2	226	1.02%
7.1.0	223	1.00%
Other	2,423	10.89%
Lotus Domino (6,986 servers)
Version	Number of Servers	Percent
7.0.2	911	13.04%
7.0.2FP2	538	7.70%
6.5.4	487	6.97%
7.0.1	453	6.48%
6.5.1	421	6.03%
6.5.3	355	5.08%
8.0	350	5.01%
6.5.5	326	4.67%
7.0	308	4.41%
7.0.2FP1	259	3.71%
6.5	249	3.56%
7.0.3	218	3.12%
5.0.11	178	2.55%
6.5.2	156	2.23%
5.0.12	111	1.59%
5.0.10	101	1.45%
7.0.1FP1	99	1.42%
5.0.8	97	1.39%
6.5.5FP2	97	1.39%
5.0.13a	95	1.36%
6.5.6	95	1.36%
6.0.2CF1	82	1.17%
6.5.4FP3	76	1.09%
6.5.4FP2	75	1.07%
6.5.6FP1	70	1.00%
Other	779	11.15%
Merak (6,504 servers)
Version	Number of Servers	Percent
8.0.3	2,004	30.81%
8.9.1	947	14.56%
8.5.0	508	7.81%
8.3.8	314	4.83%
7.4.5	312	4.80%
7.5.2	272	4.18%
7.6.4	260	4.00%
9.0.0	241	3.71%
7.4.2	161	2.48%
7.2.0	116	1.78%
8.2.4	106	1.63%
8.9.0	105	1.61%
6.2.1	91	1.40%
7.6.1	73	1.12%
7.4.0	72	1.11%
8.3.0	72	1.11%
Other	850	13.07%
Kerio (5,264 servers)
Version	Number of Servers	Percent
6.4.1	1,378	26.18%
6.3.1	839	15.94%
6.4.2	790	15.01%
6.4.0	655	12.44%
6.3.0	270	5.13%
6.2.2	126	2.39%
6.1.0	110	2.09%
6.1.3	107	2.03%
6.1.2	106	2.01%
6.2.0	100	1.90%
6.0.10	88	1.67%
6.1.4	88	1.67%
6.0.3	73	1.39%
Other	534	10.14%
CommuniGate Pro (4,927 servers)
Version	Number of Servers	Percent
4.1.8	544	11.04%
5.1.13	386	7.83%
4.2.10	360	7.31%
5.1.12	344	6.98%
5.1.10	206	4.18%
5.0.9	189	3.84%
5.0.13	181	3.67%
5.1.11	168	3.41%
5.1.9	145	2.94%
5.1.8	130	2.64%
5.1.7	116	2.35%
4.2.8	106	2.15%
5.2	97	1.97%
5.1.14	95	1.93%
4.2.7	89	1.81%
4.2	83	1.68%
5.1.5	80	1.62%
4.3.12	77	1.56%
4.2.9	77	1.56%
5.0.11	76	1.54%
5.0.8	72	1.46%
4.0.6	69	1.40%
5.1.3	66	1.34%
5.1.2	57	1.16%
5.1.6	56	1.14%
4.3.8	52	1.06%
Other	1,006	20.42%
WinWebMail (4,411 servers)
Version	Number of Servers	Percent
3.7.3.1	1,530	34.69%
3.7.1.1	854	19.36%
3.7.5.1	560	12.70%
3.6.3.1	499	11.31%
3.7.0.5	407	9.23%
3.7.0.7	265	6.01%
3.7.0.3	241	5.46%
Other	55	1.25%
Trend Micro (3,560 servers)
Version	Number of Servers	Percent
5.7	1,633	45.87%
5.5	1,371	38.51%
5.18	439	12.33%
7.0	65	1.83%
Other	52	1.46%
GroupWise (3,135 servers)
Version	Number of Servers	Percent
7.0.2	1,051	33.52%
7.0.1	472	15.06%
6.5.7	379	12.09%
6.5.4	253	8.07%
6.5.6	170	5.42%
6.0.4	152	4.85%
7.0	118	3.76%
6.5.5	116	3.70%
6.5.1	101	3.22%
6.0.2	47	1.50%
6.5.3	45	1.44%
6.5.2	44	1.40%
6.0.3	41	1.31%
5.5.5	33	1.05%
Other	113	3.60%
ArGoSoft (2,738 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	515	18.81%
1.8 (1.8.9.3)	416	15.19%
1.8 (1.8.8.8)	356	13.00%
1.8 (1.8.8.7)	281	10.26%
1.8 (1.8.9.2)	256	9.35%
1.8 (1.8.8.9)	124	4.53%
1.8 (1.8.9.0)	68	2.48%
1.8 (1.8.8.1)	65	2.37%
1.8 (1.8.8.2)	59	2.15%
1.8 (1.8.6.0)	49	1.79%
1.8 (1.8.8.4)	33	1.21%
1.8 (1.8.5.9)	33	1.21%
1.8 (1.8.8.3)	31	1.13%
1.8 (1.8.8.5)	28	1.02%
Other	424	15.49%
XMail (2,593 servers)
Version	Number of Servers	Percent
1.22	867	33.44%
1.24	655	25.26%
1.21	328	12.65%
1.20	152	5.86%
1.17	141	5.44%
1.23	132	5.09%
1.12	82	3.16%
1.25	61	2.35%
1.16	43	1.66%
1.18	39	1.50%
Other	93	3.59%
SurgeSMTP (1,815 servers)
Version	Number of Servers	Percent
3.8k4-4	597	32.89%
3.8i3-3	192	10.58%
3.7b8-8	172	9.48%
3.8f3-3	104	5.73%
3.8q-1	103	5.67%
3.6f5-5	75	4.13%
3.8f2-2	59	3.25%
3.5b3-3	59	3.25%
3.8k2-2	57	3.14%
3.0c2-2	48	2.64%
3.7b6-6	39	2.15%
3.8m-1	25	1.38%
3.8k-1	24	1.32%
3.8i-1	23	1.27%
3.8o-1	23	1.27%
2.1c7-7	19	1.05%
Other	196	10.80%
Qmail Toaster (1,583 servers)
Version	Number of Servers	Percent
1.3	1,150	72.65%
1.2	361	22.80%
1.0	72	4.55%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,069 servers)
Version	Number of Servers	Percent
Other	1,069	100.00%
Post.Office (988 servers)
Version	Number of Servers	Percent
3.5.3	256	25.91%
4.0.1	96	9.72%
3.5.3J	78	7.89%
3.8.3	60	6.07%
3.6.3	58	5.87%
3.6.2	37	3.74%
3.9.1	35	3.54%
3.9.2.3	33	3.34%
3.1.2J	31	3.14%
3.9.2	25	2.53%
3.1.2	24	2.43%
3.9.0	24	2.43%
3.8.7.4	23	2.33%
3.8.4	20	2.02%
3.5.2	18	1.82%
4.0.0.2	16	1.62%
3.9.1.3	15	1.52%
3.6.0	15	1.52%
3.8.2	14	1.42%
4.0.0.1	13	1.32%
3.9.2.1	12	1.21%
4.1	12	1.21%
Other	73	7.39%
NetIQ MailMarshal (775 servers)
Version	Number of Servers	Percent
6.0.3.8	592	76.39%
5.5.6.7	48	6.19%
6.1.3.15	37	4.77%
5.5.6.6	18	2.32%
5.5.4.16	15	1.94%
5.5.5.9	14	1.81%
5.5.6.5	14	1.81%
5.5.5.6	10	1.29%
5.5.4.17	8	1.03%
Other	19	2.45%
InterScan VirusWall (748 servers)
Version	Number of Servers	Percent
Other	748	100.00%
Interscan (604 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	115	19.04%
3.81-Build_1022	71	11.75%
3.8-Build_3013	69	11.42%
3.53 (build 2017)	52	8.61%
3.55 (build 1029)	52	8.61%
3.53 (build 2011)	51	8.44%
3.81-Build_1084	43	7.12%
3.53 (build 1493)	23	3.81%
3.53 (build 2013)	23	3.81%
3.52 (build 1375)	15	2.48%
3.55 (build 1020)	15	2.48%
3.8-Build_1080	10	1.66%
3.81-Build_1055	7	1.16%
3.8-Build_3065	7	1.16%
Other	51	8.44%
Mirapoint (576 servers)
Version	Number of Servers	Percent
3.8.3-GA	112	19.44%
3.8.4-GA	105	18.23%
3.8.5-GA	80	13.89%
3.7.5a-GA	60	10.42%
3.8.6-GA	46	7.99%
3.8.2-GA	45	7.81%
3.7.3a-GA	27	4.69%
3.7.4b-GA	26	4.51%
3.7.5-GA	13	2.26%
3.5.8-GR	9	1.56%
1.1.0	9	1.56%
3.7.2-GA	8	1.39%
3.7.1-GA	8	1.39%
Other	28	4.86%
VisNetic (535 servers)
Version	Number of Servers	Percent
8.5.0.8	63	11.78%
9.1.4.0	51	9.53%
9.1.4.1	48	8.97%
7.2.4.1	36	6.73%
5.8.6.6	30	5.61%
8.0.3.0	28	5.23%
8.3.5.0	26	4.86%
5.0.2.3	24	4.49%
8.0.3.1	24	4.49%
6.2.2.0	24	4.49%
5.5.8.3	23	4.30%
7.6.1.0	18	3.36%
8.0.3	16	2.99%
8.3.6	14	2.62%
5.3.5.0	13	2.43%
8.5.0.5	13	2.43%
5.4.5.4	12	2.24%
7.5.3.0	10	1.87%
5.8.6.4	7	1.31%
8.3.0.1	7	1.31%
7.2.4.0	6	1.12%
Other	42	7.85%
MagicMail (359 servers)
Version	Number of Servers	Percent
Other	359	100.00%
ModusMail (240 servers)
Version	Number of Servers	Percent
4.35.480.0	82	34.17%
3.2.315.0	30	12.50%
4.1.361.21	27	11.25%
4.2.425.22	25	10.42%
4.35.477.0	18	7.50%
3.1.302.0	9	3.75%
4.3.459.0	9	3.75%
4.35.480.11	8	3.33%
3.0.273.0	7	2.92%
4.2.420.0	5	2.08%
4.0.340.0	4	1.67%
4.1.361.0	3	1.25%
Other	13	5.42%
WebSTAR V (226 servers)
Version	Number of Servers	Percent
5.4.0	70	30.97%
5.4.1	57	25.22%
5.3.4	50	22.12%
5.3.3	22	9.73%
5.3.2	18	7.96%
5.3.0	6	2.65%
Other	3	1.33%
Mercury (219 servers)
Version	Number of Servers	Percent
1.48	99	45.21%
3.32	71	32.42%
3.21c	18	8.22%
3.31	9	4.11%
1.44	8	3.65%
1.47	6	2.74%
Other	8	3.65%
Neon Mail Server (173 servers)
Version	Number of Servers	Percent
3.0.7	47	27.17%
3.0.9	45	26.01%
3.1.2	36	20.81%
3.1.0	31	17.92%
3.0.8	4	2.31%
3.0.6	4	2.31%
3.1.3	2	1.16%
3.0.5	2	1.16%
Other	2	1.16%
MAILsweeper (104 servers)
Version	Number of Servers	Percent
4.3.20.0	20	19.23%
4.3.17.0	16	15.38%
4.3.14.0	15	14.42%
4.3.19.0	14	13.46%
4.3.12.0	10	9.62%
4.2.10.0	8	7.69%
4.3.1.0	6	5.77%
4.3.6.0	5	4.81%
4.3.10.0	4	3.85%
4.2.5.0	3	2.88%
4.2.1.0	2	1.92%
Other	1	0.96%
MessageWall (95 servers)
Version	Number of Servers	Percent
1.0.8	75	78.95%
1.0.11	16	16.84%
1.1.0	2	2.11%
1.0.6	2	2.11%
Other	0	0.00%
WebSTAR (86 servers)
Version	Number of Servers	Percent
Other	86	100.00%
OpenVMS (38 servers)
Version	Number of Servers	Percent
8.3	11	28.95%
7.3	11	28.95%
8.2	10	26.32%
7.2	5	13.16%
6.1	1	2.63%
Other	0	0.00%