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	1,674,404	100.0%
Number of Servers that didn't respond	239,342	14.29%
Server didn't open socket	230,744	13.78%
Server didn't provide banner	8,598	0.51%
Server provided banner	1,435,062	85.71%
Server banner identifies software in use	898,525	53.66%

As indicated by the above table, of the 1,674,404 servers queried, only 898,525 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	288,277	32.08%
Microsoft	188,670	21.00%
Exim	166,392	18.52%
Postfix	119,833	13.34%
IMail	36,909	4.11%
MDaemon	21,122	2.35%
MailEnable	19,341	2.15%
Merak	8,462	0.94%
Lotus Domino	8,300	0.92%
CommuniGate Pro	5,322	0.59%
Trend Micro	4,821	0.54%
GroupWise	4,274	0.48%
Kerio	4,024	0.45%
WinWebMail	3,780	0.42%
ArGoSoft	3,101	0.35%
XMail	2,425	0.27%
SurgeSMTP	1,735	0.19%
Gordano Messaging Suite (GMS)	1,638	0.18%
NetIQ MailMarshal	1,480	0.16%
InterScan VirusWall	1,277	0.14%
Post.Office	1,263	0.14%
Qmail Toaster	1,174	0.13%
Interscan	1,167	0.13%
ModusMail	844	0.09%
VisNetic	684	0.08%
Mirapoint	517	0.06%
WebSTAR V	329	0.04%
Mercury	328	0.04%
MAILsweeper	307	0.03%
MagicMail	237	0.03%
Neon Mail Server	166	0.02%
MessageWall	147	0.02%
WebSTAR	146	0.02%
OpenVMS	33	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (288,277 servers)
Version	Number of Servers	Percent
8.12.11.20060614	50,059	17.36%
8.12.11.20060308	36,237	12.57%
8.11.6	34,086	11.82%
8.13.6	28,611	9.92%
8.12.10	22,867	7.93%
8.13.1	21,617	7.50%
8.12.11	13,679	4.75%
8.13.8	12,211	4.24%
8.13.4	10,922	3.79%
8.12.8	10,335	3.59%
8.13.6.20060614	9,435	3.27%
8.10.2	6,996	2.43%
8.9.3	6,723	2.33%
8.13.7	6,415	2.23%
8.13.3	3,110	1.08%
Other	14,974	5.19%
Microsoft (188,670 servers)
Version	Number of Servers	Percent
6.0.3790.1830	125,483	66.51%
5.0.2195.6713	35,120	18.61%
6.0.3790.211	18,049	9.57%
6.0.3790.0	2,712	1.44%
5.5.2653.13	2,630	1.39%
Other	4,676	2.48%
Exim (166,392 servers)
Version	Number of Servers	Percent
4.63	89,600	53.85%
4.52	37,711	22.66%
4.50	10,796	6.49%
4.60	7,404	4.45%
4.62	3,959	2.38%
4.44	2,975	1.79%
3.36	1,852	1.11%
Other	12,095	7.27%
Postfix (119,833 servers)
Version	Number of Servers	Percent
Other	119,833	100.00%
IMail (36,909 servers)
Version	Number of Servers	Percent
8.15	8,167	22.13%
8.22	5,895	15.97%
8.05	4,657	12.62%
9.10	4,207	11.40%
6.06	1,954	5.29%
7.15	1,617	4.38%
7.07	1,518	4.11%
8.21	1,500	4.06%
9.04	815	2.21%
8.00	669	1.81%
8.20	626	1.70%
8.10	549	1.49%
8.12	454	1.23%
8.02	407	1.10%
8.13	385	1.04%
Other	3,489	9.45%
MDaemon (21,122 servers)
Version	Number of Servers	Percent
9.5.4	3,162	14.97%
9.5.3	1,691	8.01%
8.1.3	1,654	7.83%
9.0.4	1,286	6.09%
6.8.5	1,006	4.76%
7.2.3	831	3.93%
7.2.0	754	3.57%
9.0.1	707	3.35%
8.1.4	703	3.33%
9.0.6	676	3.20%
9.0.0	600	2.84%
9.5.1	566	2.68%
9.0.7	533	2.52%
8.0.2	532	2.52%
9.5.2	523	2.48%
8.1.1	453	2.14%
8.0.3	442	2.09%
8.1.5	420	1.99%
9.0.5	382	1.81%
7.1.2	382	1.81%
7.2.2	348	1.65%
7.1.0	340	1.61%
6.8.4	319	1.51%
8.0.1	303	1.43%
7.2.1	285	1.35%
7.0.1	284	1.34%
Other	1,940	9.18%
MailEnable (19,341 servers)
Version	Number of Servers	Percent
1.96--	2,576	13.32%
1.9--	2,329	12.04%
1.8--	2,209	11.42%
1.95--	2,003	10.36%
0-1.84-	610	3.15%
0-1.75-	563	2.91%
0-2.36-	525	2.71%
0-1.6-	520	2.69%
0-2.32-	518	2.68%
0-1.54-	494	2.55%
0-1.79-	357	1.85%
0-2.35-	344	1.78%
1.73--	337	1.74%
0-1.841-	325	1.68%
1.981--	317	1.64%
0-2.11-	298	1.54%
0--2.32	249	1.29%
0-2.2-	243	1.26%
0--2.36	236	1.22%
1.91--	234	1.21%
1.71--	212	1.10%
0--2.35	212	1.10%
0-1.71-	204	1.05%
Other	3,426	17.71%
Merak (8,462 servers)
Version	Number of Servers	Percent
8.0.3	1,846	21.82%
8.5.0	1,410	16.66%
8.9.1	631	7.46%
8.9.0	626	7.40%
8.3.8	544	6.43%
7.4.5	427	5.05%
7.6.4	342	4.04%
7.5.2	325	3.84%
7.4.2	215	2.54%
8.2.4	199	2.35%
7.2.0	185	2.19%
6.2.1	141	1.67%
8.3.0	121	1.43%
7.4.0	101	1.19%
4.4.2	88	1.04%
7.6.1	87	1.03%
Other	1,174	13.87%
Lotus Domino (8,300 servers)
Version	Number of Servers	Percent
6.5.4	790	9.52%
7.0.1	758	9.13%
6.5.1	738	8.89%
7.0.2	665	8.01%
6.5.3	562	6.77%
6.5.5	507	6.11%
7.0	463	5.58%
6.5	362	4.36%
5.0.11	326	3.93%
6.5.2	324	3.90%
5.0.12	230	2.77%
7.0.1FP1	209	2.52%
5.0.8	183	2.20%
5.0.10	162	1.95%
5.0.13a	157	1.89%
6.5.4FP2	151	1.82%
6.0.2CF1	141	1.70%
6.0.3	125	1.51%
6.5.5FP1	123	1.48%
6.0	120	1.45%
6.5.4FP1	114	1.37%
6.5.4FP3	113	1.36%
5.0.5	85	1.02%
6.5.5FP2	85	1.02%
5.0.9	85	1.02%
Other	722	8.70%
CommuniGate Pro (5,322 servers)
Version	Number of Servers	Percent
4.1.8	794	14.92%
4.2.10	544	10.22%
5.0.9	396	7.44%
5.1.3	197	3.70%
5.0.8	170	3.19%
4.2.8	156	2.93%
5.1.4	155	2.91%
5.1.2	151	2.84%
5.0.11	147	2.76%
4.2	137	2.57%
4.2.4	132	2.48%
4.2.9	124	2.33%
4.2.7	123	2.31%
4.3.8	119	2.24%
4.3.6	110	2.07%
4.0.6	108	2.03%
3.5.9	95	1.79%
4.0.1	92	1.73%
5.1.1	90	1.69%
5.0.10	85	1.60%
5.0.6	78	1.47%
5.0.13	74	1.39%
5.1	71	1.33%
5.0.12	68	1.28%
4.3.12	59	1.11%
5.0.1	55	1.03%
4.2.6	54	1.01%
Other	938	17.62%
Trend Micro (4,821 servers)
Version	Number of Servers	Percent
5.5	2,628	54.51%
5.7	1,642	34.06%
5.18	481	9.98%
Other	70	1.45%
GroupWise (4,274 servers)
Version	Number of Servers	Percent
7.0.1	1,205	28.19%
6.5.4	594	13.90%
7.0	307	7.18%
6.0.4	302	7.07%
6.5.5	287	6.72%
6.5.6	282	6.60%
6.5.7	265	6.20%
6.5.1	228	5.33%
6.5.3	141	3.30%
6.5.2	128	2.99%
6.0.2	108	2.53%
6.0.3	94	2.20%
5.5.5	81	1.90%
6.5.0	75	1.75%
6.0.1	65	1.52%
Other	112	2.62%
Kerio (4,024 servers)
Version	Number of Servers	Percent
6.3.0	860	21.37%
6.3.1	494	12.28%
6.2.2	414	10.29%
6.2.0	264	6.56%
6.1.3	229	5.69%
6.1.2	217	5.39%
6.1.4	207	5.14%
6.1.0	187	4.65%
6.0.10	146	3.63%
6.2.1	110	2.73%
6.1.1	110	2.73%
6.0.3	98	2.44%
6.0.8	67	1.67%
5.7.10	60	1.49%
6.0.9	57	1.42%
6.0.6	52	1.29%
6.0.7	44	1.09%
6.2.3	41	1.02%
Other	367	9.12%
WinWebMail (3,780 servers)
Version	Number of Servers	Percent
3.7.1.1	1,121	29.66%
3.6.3.1	839	22.20%
3.7.0.5	513	13.57%
3.7.3.1	489	12.94%
3.7.0.7	441	11.67%
3.7.0.3	331	8.76%
Other	46	1.22%
ArGoSoft (3,101 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	1,066	34.38%
1.8 (1.8.8.7)	634	20.45%
1.8 (1.8.8.1)	120	3.87%
1.8 (1.8.6.0)	97	3.13%
1.8 (1.8.8.9	90	2.90%
1.8 (1.8.8.3)	81	2.61%
1.8 (1.8.8.2)	78	2.52%
1.8 (1.8.8.5)	73	2.35%
1.8 (1.8.8.4)	65	2.10%
1.8 (1.8.7.5)	59	1.90%
1.8 (1.8.5.9)	55	1.77%
1.8 (1.8.8.6)	45	1.45%
1.8 (1.8.6.6)	43	1.39%
1.8 (1.8.7.6)	39	1.26%
1.8 (1.8.7.3)	33	1.06%
Other	523	16.87%
XMail (2,425 servers)
Version	Number of Servers	Percent
1.22	1,020	42.06%
1.21	479	19.75%
1.20	230	9.48%
1.17	193	7.96%
1.23	136	5.61%
1.12	71	2.93%
1.18	70	2.89%
1.16	41	1.69%
1.24	35	1.44%
1.10	35	1.44%
1.15	30	1.24%
1.11	27	1.11%
Other	58	2.39%
SurgeSMTP (1,735 servers)
Version	Number of Servers	Percent
3.8f2-2	604	34.81%
3.7b8-8	367	21.15%
3.6f5-5	150	8.65%
3.5b3-3	91	5.24%
3.0c2-2	85	4.90%
3.7b6-6	61	3.52%
3.8g-7	49	2.82%
2.1c7-7	32	1.84%
2.0g2-1	27	1.56%
3.8b-1	25	1.44%
1.8g3	20	1.15%
1.6e2	20	1.15%
2.2c10-10	18	1.04%
Other	186	10.72%
Gordano Messaging Suite (GMS) (1,638 servers)
Version	Number of Servers	Percent
Other	1,638	100.00%
NetIQ MailMarshal (1,480 servers)
Version	Number of Servers	Percent
6.0.3.8	1,048	70.81%
5.5.6.7	138	9.32%
6.1.3.15	75	5.07%
5.5.5.9	41	2.77%
5.5.4.16	41	2.77%
5.5.6.6	32	2.16%
5.5.6.5	29	1.96%
5.5.5.6	18	1.22%
5.5.4.17	17	1.15%
Other	41	2.77%
InterScan VirusWall (1,277 servers)
Version	Number of Servers	Percent
Other	1,277	100.00%
Post.Office (1,263 servers)
Version	Number of Servers	Percent
3.5.3	438	34.68%
3.5.3J	118	9.34%
3.8.3	74	5.86%
3.6.3	69	5.46%
3.6.2	52	4.12%
4.0.1	48	3.80%
3.1.2J	45	3.56%
3.9.1	39	3.09%
3.1.2	36	2.85%
3.8.4	31	2.45%
3.9.2	30	2.38%
3.5.2	26	2.06%
3.6.0	25	1.98%
3.9.0	25	1.98%
4.0.0.2	22	1.74%
3.8.7.4	21	1.66%
4.0.0.1	17	1.35%
3.9.1.3	15	1.19%
3.9.2.3	15	1.19%
3.8.2	13	1.03%
Other	104	8.23%
Qmail Toaster (1,174 servers)
Version	Number of Servers	Percent
1.2	550	46.85%
1.3	502	42.76%
1.0	121	10.31%
Other	1	0.09%
Interscan (1,167 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	275	23.56%
3.81-Build_1022	133	11.40%
3.8-Build_3013	113	9.68%
3.55 (build 1029)	105	9.00%
3.53 (build 2011)	101	8.65%
3.53 (build 2017)	96	8.23%
3.53 (build 2013)	59	5.06%
3.55 (build 1020)	43	3.68%
3.52 (build 1375)	34	2.91%
3.53 (build 1493)	34	2.91%
3.8-Build_1080	23	1.97%
3.81-Build_1084	18	1.54%
3.8-Build_3065	13	1.11%
Other	120	10.28%
ModusMail (844 servers)
Version	Number of Servers	Percent
4.35.480.0	539	63.86%
4.35.480.11	49	5.81%
3.2.315.0	37	4.38%
4.1.361.21	27	3.20%
4.2.425.22	26	3.08%
4.2.425.16	25	2.96%
3.1.302.0	25	2.96%
4.35.477.0	25	2.96%
3.1.297.0	18	2.13%
4.3.459.0	13	1.54%
4.2.425.4	12	1.42%
4.1.361.0	9	1.07%
Other	39	4.62%
VisNetic (684 servers)
Version	Number of Servers	Percent
8.5.0.8	93	13.60%
7.2.4.1	57	8.33%
5.8.6.6	48	7.02%
5.0.2.3	47	6.87%
8.0.3.0	45	6.58%
8.3.5.0	40	5.85%
7.6.1.0	40	5.85%
6.2.2.0	40	5.85%
5.5.8.3	37	5.41%
8.0.3.1	35	5.12%
8.3.6	33	4.82%
8.5.0.5	27	3.95%
5.4.5.4	21	3.07%
7.5.3.0	19	2.78%
8.0.3	15	2.19%
5.3.5.0	14	2.05%
8.3.0.1	13	1.90%
5.8.6.4	10	1.46%
7.2.4.0	9	1.32%
Other	41	5.99%
Mirapoint (517 servers)
Version	Number of Servers	Percent
3.7.5a-GA	96	18.57%
3.8.2-GA	78	15.09%
3.7.3a-GA	61	11.80%
3.7.4b-GA	46	8.90%
3.7.5-GA	34	6.58%
3.8.3-GA	29	5.61%
3.7.2-GA	22	4.26%
3.5.8-GR	21	4.06%
3.7.1-GA	19	3.68%
1.1.0	11	2.13%
3.8.1-FCS	11	2.13%
3.7.0-GA	10	1.93%
3.8.0-FCS	10	1.93%
3.6.6-GR	7	1.35%
3.7.3-GA	7	1.35%
3.5.9-GR	6	1.16%
3.6.4-CR	6	1.16%
3.6.5-GR	6	1.16%
Other	37	7.16%
WebSTAR V (329 servers)
Version	Number of Servers	Percent
5.4.1	98	29.79%
5.4.0	97	29.48%
5.3.4	70	21.28%
5.3.3	30	9.12%
5.3.2	19	5.78%
5.3.0	10	3.04%
Other	5	1.52%
Mercury (328 servers)
Version	Number of Servers	Percent
1.48	147	44.82%
3.32	113	34.45%
3.21c	25	7.62%
3.31	16	4.88%
1.44	10	3.05%
1.47	6	1.83%
3.01a	5	1.52%
Other	6	1.83%
MAILsweeper (307 servers)
Version	Number of Servers	Percent
4.3.12.0	51	16.61%
4.3.19.0	47	15.31%
4.3.17.0	46	14.98%
4.3.20.0	44	14.33%
4.3.14.0	40	13.03%
4.3.1.0	15	4.89%
4.2.10.0	15	4.89%
4.2.1.0	13	4.23%
4.2.5.0	12	3.91%
4.3.10.0	11	3.58%
4.3.6.0	9	2.93%
Other	4	1.30%
MagicMail (237 servers)
Version	Number of Servers	Percent
Other	237	100.00%
Neon Mail Server (166 servers)
Version	Number of Servers	Percent
3.0.9	75	45.18%
3.0.7	69	41.57%
3.0.8	9	5.42%
3.0.6	8	4.82%
3.0.4	2	1.20%
3.0.5	2	1.20%
Other	1	0.60%
MessageWall (147 servers)
Version	Number of Servers	Percent
1.0.8	112	76.19%
1.0.11	18	12.24%
1.1.23	7	4.76%
1.0.6	4	2.72%
1.1.0	3	2.04%
Other	3	2.04%
WebSTAR (146 servers)
Version	Number of Servers	Percent
Other	146	100.00%
OpenVMS (33 servers)
Version	Number of Servers	Percent
7.3	13	39.39%
8.2	9	27.27%
7.2	7	21.21%
8.3	3	9.09%
6.1	1	3.03%
Other	0	0.00%