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	1,770,241	100.0%
Number of Servers that didn't respond	248,645	14.05%
Server didn't open socket	238,356	13.46%
Server didn't provide banner	10,289	0.58%
Server provided banner	1,521,596	85.95%
Server banner identifies software in use	921,377	52.05%

As indicated by the above table, of the 1,770,241 servers queried, only 921,377 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	259,416	28.16%
Microsoft	204,516	22.20%
Exim	189,421	20.56%
Postfix	140,661	15.27%
IMail	28,563	3.10%
MDaemon	22,521	2.44%
MailEnable	21,964	2.38%
Merak	7,855	0.85%
Lotus Domino	7,433	0.81%
Kerio	5,175	0.56%
CommuniGate Pro	5,159	0.56%
WinWebMail	4,565	0.50%
Trend Micro	4,061	0.44%
GroupWise	3,443	0.37%
ArGoSoft	2,943	0.32%
XMail	2,654	0.29%
SurgeSMTP	1,844	0.20%
Qmail Toaster	1,546	0.17%
Gordano Messaging Suite (GMS)	1,197	0.13%
Post.Office	1,077	0.12%
InterScan VirusWall	924	0.10%
NetIQ MailMarshal	897	0.10%
Interscan	757	0.08%
VisNetic	564	0.06%
Mirapoint	558	0.06%
MagicMail	329	0.04%
ModusMail	271	0.03%
WebSTAR V	247	0.03%
Mercury	237	0.03%
Neon Mail Server	185	0.02%
MAILsweeper	141	0.02%
MessageWall	114	0.01%
WebSTAR	102	0.01%
OpenVMS	37	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (259,416 servers)
Version	Number of Servers	Percent
8.12.11.20060614	43,112	16.62%
8.12.11.20060308	32,876	12.67%
8.13.1	26,687	10.29%
8.13.6	24,618	9.49%
8.11.6	24,594	9.48%
8.12.10	16,982	6.55%
8.13.8	15,390	5.93%
8.12.11	10,459	4.03%
8.13.6.20060614	10,372	4.00%
8.14.1	9,420	3.63%
8.13.4	8,671	3.34%
8.12.8	7,493	2.89%
8.13.7	6,018	2.32%
8.10.2	4,454	1.72%
8.9.3	4,368	1.68%
Other	13,902	5.36%
Microsoft (204,516 servers)
Version	Number of Servers	Percent
6.0.3790.3959	95,424	46.66%
6.0.3790.1830	67,530	33.02%
5.0.2195.6713	24,658	12.06%
6.0.3790.211	10,571	5.17%
Other	6,333	3.10%
Exim (189,421 servers)
Version	Number of Servers	Percent
4.68	94,839	50.07%
4.63	43,831	23.14%
4.66	12,918	6.82%
4.50	8,086	4.27%
4.60	7,671	4.05%
4.67	4,503	2.38%
4.62	3,964	2.09%
4.52	3,701	1.95%
Other	9,908	5.23%
Postfix (140,661 servers)
Version	Number of Servers	Percent
Other	140,661	100.00%
IMail (28,563 servers)
Version	Number of Servers	Percent
8.22	5,647	19.77%
8.15	4,939	17.29%
8.05	2,896	10.14%
9.21	2,693	9.43%
9.10	2,268	7.94%
9.20	1,413	4.95%
7.07	1,191	4.17%
7.15	1,137	3.98%
6.06	889	3.11%
8.00	630	2.21%
8.21	604	2.11%
8.20	404	1.41%
8.12	321	1.12%
8.04	321	1.12%
8.10	316	1.11%
8.02	307	1.07%
8.01	298	1.04%
Other	2,289	8.01%
MDaemon (22,521 servers)
Version	Number of Servers	Percent
9.6.2	5,244	23.28%
9.5.6	1,716	7.62%
9.6.1	1,381	6.13%
8.1.3	1,248	5.54%
9.0.4	1,123	4.99%
6.8.5	757	3.36%
9.5.2	723	3.21%
9.5.1	684	3.04%
7.2.3	661	2.94%
7.2.0	544	2.42%
9.0.1	528	2.34%
9.5.5	505	2.24%
9.6.0	496	2.20%
9.5.4	480	2.13%
8.1.4	466	2.07%
9.0.0	441	1.96%
8.0.2	422	1.87%
9.5.3	358	1.59%
8.1.1	349	1.55%
7.1.2	302	1.34%
8.1.5	300	1.33%
8.0.3	292	1.30%
9.0.7	277	1.23%
7.1.0	267	1.19%
7.2.2	258	1.15%
7.2.1	245	1.09%
9.0.6	240	1.07%
Other	2,214	9.83%
MailEnable (21,964 servers)
Version	Number of Servers	Percent
1.981--	5,019	22.85%
1.96--	2,012	9.16%
1.95--	1,664	7.58%
1.9--	1,485	6.76%
1.8--	1,396	6.36%
0-2.37-	1,302	5.93%
1.983--	1,189	5.41%
0-1.85-	1,135	5.17%
0-2.38-	996	4.53%
0--2.37	574	2.61%
0-2.36-	566	2.58%
0--2.38	544	2.48%
0-1.841-	263	1.20%
Other	3,819	17.39%
Merak (7,855 servers)
Version	Number of Servers	Percent
8.0.3	2,084	26.53%
8.9.1	1,429	18.19%
8.5.0	637	8.11%
9.0.0	559	7.12%
7.4.5	331	4.21%
8.3.8	323	4.11%
7.5.2	318	4.05%
7.6.4	280	3.56%
7.4.2	174	2.22%
7.2.0	132	1.68%
8.9.0	125	1.59%
8.2.4	125	1.59%
6.2.1	94	1.20%
7.4.0	89	1.13%
8.3.0	84	1.07%
Other	1,071	13.63%
Lotus Domino (7,433 servers)
Version	Number of Servers	Percent
7.0.2	948	12.75%
6.5.4	539	7.25%
7.0.1	537	7.22%
7.0.2FP2	526	7.08%
6.5.1	495	6.66%
6.5.3	411	5.53%
6.5.5	370	4.98%
7.0.2FP1	348	4.68%
7.0	342	4.60%
6.5	274	3.69%
5.0.11	211	2.84%
6.5.2	205	2.76%
8.0	158	2.13%
5.0.12	144	1.94%
5.0.8	123	1.65%
6.5.5FP2	122	1.64%
7.0.1FP1	120	1.61%
5.0.13a	107	1.44%
5.0.10	107	1.44%
6.0.2CF1	101	1.36%
6.5.4FP2	91	1.22%
6.5.4FP3	91	1.22%
6.0.3	81	1.09%
6.0	80	1.08%
6.5.6	76	1.02%
Other	826	11.11%
Kerio (5,175 servers)
Version	Number of Servers	Percent
6.4.1	1,408	27.21%
6.3.1	1,059	20.46%
6.4.0	852	16.46%
6.3.0	334	6.45%
6.2.2	146	2.82%
6.2.0	134	2.59%
6.1.2	129	2.49%
6.1.3	127	2.45%
6.1.0	122	2.36%
6.0.10	107	2.07%
6.1.4	99	1.91%
6.0.3	81	1.57%
6.1.1	62	1.20%
6.0.8	55	1.06%
Other	460	8.89%
CommuniGate Pro (5,159 servers)
Version	Number of Servers	Percent
4.1.8	601	11.65%
4.2.10	418	8.10%
5.1.12	347	6.73%
5.1.11	253	4.90%
5.1.10	253	4.90%
5.0.9	218	4.23%
5.0.13	198	3.84%
5.1.9	168	3.26%
5.1.7	155	3.00%
5.1.8	150	2.91%
4.3.12	126	2.44%
4.2.8	117	2.27%
4.2.7	103	2.00%
4.2	102	1.98%
4.0.1	98	1.90%
5.0.8	96	1.86%
4.2.9	90	1.74%
5.0.11	89	1.73%
5.1.5	87	1.69%
5.1.3	84	1.63%
4.0.6	75	1.45%
5.1.6	73	1.42%
4.3.8	60	1.16%
5.1.2	58	1.12%
5.1.4	56	1.09%
3.5.9	55	1.07%
Other	1,029	19.95%
WinWebMail (4,565 servers)
Version	Number of Servers	Percent
3.7.3.1	1,871	40.99%
3.7.1.1	972	21.29%
3.6.3.1	618	13.54%
3.7.0.5	465	10.19%
3.7.0.7	303	6.64%
3.7.0.3	286	6.27%
Other	50	1.10%
Trend Micro (4,061 servers)
Version	Number of Servers	Percent
5.7	1,812	44.62%
5.5	1,684	41.47%
5.18	451	11.11%
7.0	49	1.21%
Other	65	1.60%
GroupWise (3,443 servers)
Version	Number of Servers	Percent
7.0.2	916	26.60%
7.0.1	596	17.31%
6.5.7	411	11.94%
6.5.4	296	8.60%
6.5.6	213	6.19%
6.0.4	197	5.72%
7.0	150	4.36%
6.5.5	146	4.24%
6.5.1	125	3.63%
6.0.2	61	1.77%
6.5.3	56	1.63%
6.5.2	52	1.51%
6.0.3	52	1.51%
5.5.5	44	1.28%
Other	128	3.72%
ArGoSoft (2,943 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	701	23.82%
1.8 (1.8.8.8)	469	15.94%
1.8 (1.8.8.7)	338	11.48%
1.8 (1.8.9.2)	272	9.24%
1.8 (1.8.8.9)	176	5.98%
1.8 (1.8.9.0)	102	3.47%
1.8 (1.8.8.1)	75	2.55%
1.8 (1.8.8.2)	66	2.24%
1.8 (1.8.6.0)	62	2.11%
1.8 (1.8.8.3)	48	1.63%
1.8 (1.8.7.5)	42	1.43%
1.8 (1.8.5.9)	42	1.43%
1.8 (1.8.8.4)	37	1.26%
1.8 (1.8.8.5)	33	1.12%
1.8 (1.8.8.9	33	1.12%
Other	447	15.19%
XMail (2,654 servers)
Version	Number of Servers	Percent
1.22	911	34.33%
1.24	574	21.63%
1.21	381	14.36%
1.20	172	6.48%
1.17	158	5.95%
1.23	142	5.35%
1.12	90	3.39%
1.18	50	1.88%
1.16	44	1.66%
Other	132	4.97%
SurgeSMTP (1,844 servers)
Version	Number of Servers	Percent
3.8k4-4	338	18.33%
3.8i3-3	314	17.03%
3.7b8-8	189	10.25%
3.8f3-3	144	7.81%
3.8o-1	115	6.24%
3.6f5-5	100	5.42%
3.8k2-2	100	5.42%
3.8f2-2	92	4.99%
3.5b3-3	63	3.42%
3.0c2-2	50	2.71%
3.7b6-6	41	2.22%
3.8m-1	39	2.11%
3.8i-1	30	1.63%
3.8k-1	27	1.46%
2.0g2-1	19	1.03%
Other	183	9.92%
Qmail Toaster (1,546 servers)
Version	Number of Servers	Percent
1.3	1,034	66.88%
1.2	419	27.10%
1.0	93	6.02%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,197 servers)
Version	Number of Servers	Percent
Other	1,197	100.00%
Post.Office (1,077 servers)
Version	Number of Servers	Percent
3.5.3	305	28.32%
4.0.1	100	9.29%
3.5.3J	85	7.89%
3.8.3	66	6.13%
3.6.3	54	5.01%
3.6.2	42	3.90%
3.9.1	39	3.62%
3.1.2J	36	3.34%
3.1.2	29	2.69%
3.9.2.3	29	2.69%
3.9.2	28	2.60%
3.9.0	27	2.51%
3.8.7.4	24	2.23%
3.8.4	23	2.14%
3.5.2	22	2.04%
4.0.0.2	21	1.95%
3.6.0	16	1.49%
3.8.2	14	1.30%
3.9.1.3	13	1.21%
3.9.2.1	13	1.21%
4.0.0.1	13	1.21%
Other	78	7.24%
InterScan VirusWall (924 servers)
Version	Number of Servers	Percent
Other	924	100.00%
NetIQ MailMarshal (897 servers)
Version	Number of Servers	Percent
6.0.3.8	680	75.81%
5.5.6.7	52	5.80%
6.1.3.15	44	4.91%
5.5.4.16	21	2.34%
5.5.6.6	21	2.34%
5.5.6.5	20	2.23%
5.5.5.9	16	1.78%
5.5.5.6	12	1.34%
5.5.4.17	9	1.00%
Other	22	2.45%
Interscan (757 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	163	21.53%
3.81-Build_1022	89	11.76%
3.8-Build_3013	80	10.57%
3.53 (build 2017)	63	8.32%
3.53 (build 2011)	60	7.93%
3.55 (build 1029)	53	7.00%
3.81-Build_1084	47	6.21%
3.53 (build 2013)	30	3.96%
3.52 (build 1375)	25	3.30%
3.53 (build 1493)	25	3.30%
3.55 (build 1020)	24	3.17%
3.8-Build_1080	13	1.72%
3.8-Build_3065	10	1.32%
3.81-Build_1055	8	1.06%
Other	67	8.85%
VisNetic (564 servers)
Version	Number of Servers	Percent
8.5.0.8	124	21.99%
7.2.4.1	38	6.74%
8.3.5.0	36	6.38%
5.8.6.6	35	6.21%
8.0.3.1	33	5.85%
8.0.3.0	33	5.85%
6.2.2.0	30	5.32%
7.6.1.0	27	4.79%
5.0.2.3	25	4.43%
5.5.8.3	23	4.08%
5.3.5.0	18	3.19%
5.4.5.4	15	2.66%
8.3.6	14	2.48%
8.0.3	14	2.48%
8.5.0.5	13	2.30%
8.9.2.0	12	2.13%
7.5.3.0	11	1.95%
5.0.1	8	1.42%
5.8.6.4	7	1.24%
7.2.4.0	6	1.06%
8.3.0.1	6	1.06%
Other	36	6.38%
Mirapoint (558 servers)
Version	Number of Servers	Percent
3.8.3-GA	105	18.82%
3.8.4-GA	103	18.46%
3.7.5a-GA	72	12.90%
3.8.5-GA	68	12.19%
3.8.2-GA	56	10.04%
3.7.3a-GA	34	6.09%
3.7.4b-GA	32	5.73%
3.7.5-GA	17	3.05%
3.7.2-GA	9	1.61%
3.5.8-GR	9	1.61%
3.7.1-GA	8	1.43%
1.1.0	7	1.25%
3.7.3-GA	6	1.08%
Other	32	5.73%
MagicMail (329 servers)
Version	Number of Servers	Percent
Other	329	100.00%
ModusMail (271 servers)
Version	Number of Servers	Percent
4.35.480.0	85	31.37%
3.2.315.0	32	11.81%
4.1.361.21	28	10.33%
4.2.425.22	24	8.86%
4.35.477.0	22	8.12%
3.0.273.0	12	4.43%
3.1.297.0	11	4.06%
3.1.302.0	10	3.69%
4.35.480.11	9	3.32%
4.3.459.0	8	2.95%
4.2.420.0	5	1.85%
4.2.425.4	4	1.48%
4.1.361.0	3	1.11%
4.0.340.0	3	1.11%
Other	15	5.54%
WebSTAR V (247 servers)
Version	Number of Servers	Percent
5.4.0	78	31.58%
5.4.1	63	25.51%
5.3.4	54	21.86%
5.3.3	21	8.50%
5.3.2	20	8.10%
5.3.0	8	3.24%
Other	3	1.21%
Mercury (237 servers)
Version	Number of Servers	Percent
1.48	106	44.73%
3.32	80	33.76%
3.21c	22	9.28%
1.44	9	3.80%
3.31	7	2.95%
1.47	5	2.11%
Other	8	3.38%
Neon Mail Server (185 servers)
Version	Number of Servers	Percent
3.0.9	64	34.59%
3.0.7	49	26.49%
3.1.0	40	21.62%
3.1.2	13	7.03%
3.0.6	8	4.32%
3.0.8	6	3.24%
3.0.4	2	1.08%
3.0.5	2	1.08%
Other	1	0.54%
MAILsweeper (141 servers)
Version	Number of Servers	Percent
4.3.20.0	28	19.86%
4.3.14.0	23	16.31%
4.3.17.0	22	15.60%
4.3.19.0	18	12.77%
4.3.12.0	15	10.64%
4.2.10.0	9	6.38%
4.3.10.0	7	4.96%
4.3.6.0	6	4.26%
4.2.5.0	5	3.55%
4.3.1.0	4	2.84%
4.2.1.0	2	1.42%
Other	2	1.42%
MessageWall (114 servers)
Version	Number of Servers	Percent
1.0.8	91	79.82%
1.0.11	17	14.91%
1.0.6	3	2.63%
1.1.0	3	2.63%
Other	0	0.00%
WebSTAR (102 servers)
Version	Number of Servers	Percent
Other	102	100.00%
OpenVMS (37 servers)
Version	Number of Servers	Percent
7.3	15	40.54%
8.2	10	27.03%
8.3	8	21.62%
7.2	3	8.11%
6.1	1	2.70%
Other	0	0.00%