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	1,831,463	100.0%
Number of Servers that didn't respond	284,968	15.56%
Server didn't open socket	273,712	14.94%
Server didn't provide banner	11,256	0.61%
Server provided banner	1,546,495	84.44%
Server banner identifies software in use	920,188	50.24%

As indicated by the above table, of the 1,831,463 servers queried, only 920,188 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	242,576	26.36%
Exim	203,725	22.14%
Microsoft	203,533	22.12%
Postfix	147,620	16.04%
IMail	26,147	2.84%
MailEnable	23,342	2.54%
MDaemon	22,711	2.47%
Lotus Domino	6,965	0.76%
Merak	6,421	0.70%
Kerio	5,483	0.60%
CommuniGate Pro	4,941	0.54%
WinWebMail	4,687	0.51%
Trend Micro	3,435	0.37%
GroupWise	3,081	0.33%
ArGoSoft	2,715	0.30%
XMail	2,654	0.29%
SurgeSMTP	1,828	0.20%
Qmail Toaster	1,629	0.18%
Gordano Messaging Suite (GMS)	1,028	0.11%
Post.Office	970	0.11%
NetIQ MailMarshal	742	0.08%
InterScan VirusWall	708	0.08%
Mirapoint	590	0.06%
Interscan	568	0.06%
VisNetic	545	0.06%
MagicMail	373	0.04%
ModusMail	246	0.03%
WebSTAR V	220	0.02%
Mercury	203	0.02%
Neon Mail Server	184	0.02%
MAILsweeper	100	0.01%
MessageWall	93	0.01%
WebSTAR	89	0.01%
OpenVMS	36	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (242,576 servers)
Version	Number of Servers	Percent
8.12.11.20060614	36,097	14.88%
8.13.1	30,674	12.65%
8.12.11.20060308	28,080	11.58%
8.13.6	23,450	9.67%
8.11.6	20,892	8.61%
8.13.8	16,273	6.71%
8.12.10	15,091	6.22%
8.13.6.20060614	10,629	4.38%
8.14.1	9,335	3.85%
8.12.11	8,909	3.67%
8.13.4	7,652	3.15%
8.12.8	6,523	2.69%
8.13.7	5,922	2.44%
8.14.2	3,882	1.60%
8.9.3	3,737	1.54%
8.10.2	3,368	1.39%
Other	12,062	4.97%
Exim (203,725 servers)
Version	Number of Servers	Percent
4.68	130,508	64.06%
4.63	30,928	15.18%
4.60	7,125	3.50%
4.66	6,893	3.38%
4.50	6,370	3.13%
4.67	5,185	2.55%
4.62	4,161	2.04%
4.69	2,269	1.11%
Other	10,286	5.05%
Microsoft (203,533 servers)
Version	Number of Servers	Percent
6.0.3790.3959	120,583	59.24%
6.0.3790.1830	49,795	24.47%
5.0.2195.6713	20,241	9.94%
6.0.3790.211	7,967	3.91%
Other	4,947	2.43%
Postfix (147,620 servers)
Version	Number of Servers	Percent
Other	147,620	100.00%
IMail (26,147 servers)
Version	Number of Servers	Percent
8.22	5,326	20.37%
8.15	4,959	18.97%
9.23	2,009	7.68%
8.05	1,745	6.67%
9.10	1,487	5.69%
9.21	1,375	5.26%
9.22	1,116	4.27%
7.07	1,055	4.03%
7.15	940	3.60%
9.20	810	3.10%
6.06	720	2.75%
8.00	565	2.16%
8.21	556	2.13%
8.20	378	1.45%
8.04	341	1.30%
8.10	286	1.09%
8.01	280	1.07%
Other	2,199	8.41%
MailEnable (23,342 servers)
Version	Number of Servers	Percent
1.981--	5,858	25.10%
1.983--	2,236	9.58%
1.96--	1,768	7.57%
1.95--	1,530	6.55%
1.9--	1,347	5.77%
1.8--	1,133	4.85%
0-1.85-	1,085	4.65%
0-2.37-	978	4.19%
0-3.04-	617	2.64%
0-2.38-	592	2.54%
0-2.36-	481	2.06%
0-2.40-	394	1.69%
0--2.37	392	1.68%
0--2.38	324	1.39%
0--3.04	316	1.35%
0-1.841-	242	1.04%
0-3.10-	234	1.00%
Other	3,815	16.34%
MDaemon (22,711 servers)
Version	Number of Servers	Percent
9.6.4	4,176	18.39%
9.6.3	2,082	9.17%
9.6.2	1,825	8.04%
9.6.1	1,251	5.51%
9.5.6	1,210	5.33%
8.1.3	1,061	4.67%
9.0.4	1,003	4.42%
9.5.2	745	3.28%
9.5.1	686	3.02%
6.8.5	636	2.80%
7.2.3	559	2.46%
7.2.0	474	2.09%
9.0.1	467	2.06%
9.5.5	405	1.78%
9.0.0	389	1.71%
8.1.4	379	1.67%
8.0.2	363	1.60%
9.5.4	353	1.55%
8.1.1	328	1.44%
9.6.0	316	1.39%
9.5.3	280	1.23%
8.0.3	266	1.17%
7.1.2	261	1.15%
8.1.5	254	1.12%
Other	2,942	12.95%
Lotus Domino (6,965 servers)
Version	Number of Servers	Percent
7.0.2	906	13.01%
7.0.2FP2	505	7.25%
6.5.4	463	6.65%
7.0.1	444	6.37%
8.0	414	5.94%
6.5.1	400	5.74%
6.5.3	356	5.11%
7.0	302	4.34%
6.5.5	300	4.31%
7.0.3	287	4.12%
7.0.2FP1	252	3.62%
6.5	241	3.46%
5.0.11	175	2.51%
6.5.2	161	2.31%
5.0.12	110	1.58%
6.5.5FP2	98	1.41%
5.0.8	93	1.34%
7.0.1FP1	92	1.32%
6.5.6	92	1.32%
5.0.10	91	1.31%
5.0.13a	90	1.29%
6.0.2CF1	78	1.12%
6.5.4FP3	74	1.06%
6.5.4FP2	73	1.05%
Other	868	12.46%
Merak (6,421 servers)
Version	Number of Servers	Percent
8.0.3	2,112	32.89%
8.9.1	857	13.35%
8.5.0	477	7.43%
7.4.5	314	4.89%
8.3.8	309	4.81%
7.5.2	273	4.25%
7.6.4	260	4.05%
9.0.0	202	3.15%
7.4.2	155	2.41%
7.2.0	117	1.82%
8.2.4	104	1.62%
8.9.0	94	1.46%
6.2.1	92	1.43%
7.6.1	79	1.23%
8.3.0	69	1.07%
7.4.0	65	1.01%
Other	842	13.11%
Kerio (5,483 servers)
Version	Number of Servers	Percent
6.4.1	1,220	22.25%
6.4.2	1,188	21.67%
6.3.1	814	14.85%
6.4.0	626	11.42%
6.3.0	274	5.00%
6.2.2	120	2.19%
6.1.3	108	1.97%
6.1.0	104	1.90%
6.1.2	103	1.88%
6.2.0	101	1.84%
6.0.10	93	1.70%
6.1.4	86	1.57%
6.0.3	69	1.26%
6.5.0	67	1.22%
Other	510	9.30%
CommuniGate Pro (4,941 servers)
Version	Number of Servers	Percent
4.1.8	526	10.65%
5.1.13	363	7.35%
4.2.10	328	6.64%
5.1.12	326	6.60%
5.1.14	241	4.88%
5.1.10	196	3.97%
5.0.13	176	3.56%
5.0.9	168	3.40%
5.1.9	139	2.81%
5.1.11	134	2.71%
5.1.8	122	2.47%
5.1.7	113	2.29%
4.2.8	103	2.08%
4.2.7	86	1.74%
4.2	85	1.72%
5.2.0	84	1.70%
4.3.12	78	1.58%
5.1.5	78	1.58%
5.0.11	77	1.56%
4.2.9	75	1.52%
5.2	74	1.50%
5.0.8	71	1.44%
4.0.6	70	1.42%
5.1.3	62	1.25%
5.0.14	53	1.07%
4.3.8	53	1.07%
5.1.6	52	1.05%
5.1.2	50	1.01%
Other	958	19.39%
WinWebMail (4,687 servers)
Version	Number of Servers	Percent
3.7.3.1	1,607	34.29%
3.7.1.1	874	18.65%
3.7.5.1	639	13.63%
3.6.3.1	479	10.22%
3.7.0.5	407	8.68%
3.7.0.7	266	5.68%
3.7.0.3	254	5.42%
3.7.6.1	107	2.28%
Other	54	1.15%
Trend Micro (3,435 servers)
Version	Number of Servers	Percent
5.7	1,581	46.03%
5.5	1,296	37.73%
5.18	432	12.58%
7.0	72	2.10%
Other	54	1.57%
GroupWise (3,081 servers)
Version	Number of Servers	Percent
7.0.2	1,073	34.83%
7.0.1	448	14.54%
6.5.7	367	11.91%
6.5.4	238	7.72%
6.5.6	166	5.39%
6.0.4	153	4.97%
7.0	115	3.73%
6.5.5	112	3.64%
6.5.1	100	3.25%
6.5.2	45	1.46%
6.0.2	40	1.30%
6.5.3	38	1.23%
6.0.3	36	1.17%
Other	150	4.87%
ArGoSoft (2,715 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	503	18.53%
1.8 (1.8.9.3)	498	18.34%
1.8 (1.8.8.8)	322	11.86%
1.8 (1.8.8.7)	270	9.94%
1.8 (1.8.9.2)	231	8.51%
1.8 (1.8.8.9)	125	4.60%
1.8 (1.8.9.0)	64	2.36%
1.8 (1.8.8.1)	57	2.10%
1.8 (1.8.8.2)	55	2.03%
1.8 (1.8.6.0)	53	1.95%
1.8 (1.8.5.9)	34	1.25%
1.8 (1.8.8.3)	33	1.22%
1.8 (1.8.7.5)	30	1.10%
1.8 (1.8.8.4)	29	1.07%
Other	411	15.14%
XMail (2,654 servers)
Version	Number of Servers	Percent
1.22	870	32.78%
1.24	615	23.17%
1.21	331	12.47%
1.25	172	6.48%
1.20	146	5.50%
1.17	139	5.24%
1.23	125	4.71%
1.12	87	3.28%
1.16	44	1.66%
1.18	35	1.32%
Other	90	3.39%
SurgeSMTP (1,828 servers)
Version	Number of Servers	Percent
3.8k4-4	671	36.71%
3.8i3-3	184	10.07%
3.7b8-8	105	5.74%
3.8f3-3	96	5.25%
3.8q-1	84	4.60%
3.6f5-5	72	3.94%
3.5b3-3	60	3.28%
3.8f2-2	59	3.23%
3.8k2-2	48	2.63%
3.0c2-2	48	2.63%
3.8t-5	39	2.13%
3.7b6-6	36	1.97%
3.9a-1	30	1.64%
3.8i-1	24	1.31%
3.8m-1	23	1.26%
3.8k-1	22	1.20%
3.8o-1	22	1.20%
Other	205	11.21%
Qmail Toaster (1,629 servers)
Version	Number of Servers	Percent
1.3	1,196	73.42%
1.2	356	21.85%
1.0	73	4.48%
Other	4	0.25%
Gordano Messaging Suite (GMS) (1,028 servers)
Version	Number of Servers	Percent
Other	1,028	100.00%
Post.Office (970 servers)
Version	Number of Servers	Percent
3.5.3	243	25.05%
4.0.1	92	9.48%
3.5.3J	76	7.84%
3.8.3	56	5.77%
3.6.3	55	5.67%
3.6.2	40	4.12%
3.9.1	36	3.71%
3.9.2.3	33	3.40%
3.1.2J	30	3.09%
3.9.2	26	2.68%
3.8.7.4	23	2.37%
3.1.2	22	2.27%
3.8.4	22	2.27%
3.9.0	20	2.06%
3.5.2	18	1.86%
4.1	16	1.65%
3.9.1.3	15	1.55%
3.6.0	14	1.44%
4.0.0.2	14	1.44%
3.8.2	13	1.34%
3.9.2.1	12	1.24%
4.0.0.1	12	1.24%
Other	82	8.45%
NetIQ MailMarshal (742 servers)
Version	Number of Servers	Percent
6.0.3.8	574	77.36%
5.5.6.7	45	6.06%
6.1.3.15	36	4.85%
5.5.6.6	17	2.29%
5.5.5.9	14	1.89%
5.5.4.16	13	1.75%
5.5.6.5	11	1.48%
5.5.5.6	9	1.21%
Other	23	3.10%
InterScan VirusWall (708 servers)
Version	Number of Servers	Percent
Other	708	100.00%
Mirapoint (590 servers)
Version	Number of Servers	Percent
3.8.3-GA	111	18.81%
3.8.4-GA	110	18.64%
3.8.5-GA	77	13.05%
3.8.6-GA	64	10.85%
3.7.5a-GA	56	9.49%
3.8.2-GA	45	7.63%
3.7.3a-GA	28	4.75%
3.7.4b-GA	24	4.07%
3.7.5-GA	13	2.20%
3.5.8-GR	11	1.86%
1.1.0	9	1.53%
3.7.2-GA	8	1.36%
3.7.1-GA	6	1.02%
Other	28	4.75%
Interscan (568 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	98	17.25%
3.81-Build_1022	71	12.50%
3.8-Build_3013	68	11.97%
3.53 (build 2017)	52	9.15%
3.55 (build 1029)	51	8.98%
3.53 (build 2011)	44	7.75%
3.81-Build_1084	40	7.04%
3.53 (build 1493)	22	3.87%
3.53 (build 2013)	19	3.35%
3.52 (build 1375)	16	2.82%
3.55 (build 1020)	16	2.82%
3.8-Build_1080	9	1.58%
3.81-Build_1055	7	1.23%
Other	55	9.68%
VisNetic (545 servers)
Version	Number of Servers	Percent
9.1.4.1	79	14.50%
9.1.4.0	54	9.91%
8.5.0.8	51	9.36%
5.8.6.6	35	6.42%
7.2.4.1	35	6.42%
8.3.5.0	30	5.50%
5.0.2.3	26	4.77%
8.0.3.0	26	4.77%
5.5.8.3	25	4.59%
8.0.3.1	22	4.04%
7.6.1.0	19	3.49%
6.2.2.0	19	3.49%
8.0.3	15	2.75%
5.3.5.0	12	2.20%
5.4.5.4	12	2.20%
8.3.6	10	1.83%
7.5.3.0	9	1.65%
8.5.0.5	8	1.47%
5.8.6.4	6	1.10%
5.0.2.1	6	1.10%
7.2.4.0	6	1.10%
8.3.0.1	6	1.10%
Other	34	6.24%
MagicMail (373 servers)
Version	Number of Servers	Percent
Other	373	100.00%
ModusMail (246 servers)
Version	Number of Servers	Percent
4.35.480.0	87	35.37%
3.2.315.0	29	11.79%
4.1.361.21	26	10.57%
4.2.425.22	26	10.57%
4.35.477.0	16	6.50%
3.0.273.0	11	4.47%
3.1.302.0	10	4.07%
4.3.459.0	9	3.66%
4.35.480.11	7	2.85%
4.2.420.0	5	2.03%
4.0.340.0	4	1.63%
4.1.361.0	3	1.22%
Other	13	5.28%
WebSTAR V (220 servers)
Version	Number of Servers	Percent
5.4.0	67	30.45%
5.4.1	60	27.27%
5.3.4	45	20.45%
5.3.3	22	10.00%
5.3.2	17	7.73%
5.3.0	6	2.73%
Other	3	1.36%
Mercury (203 servers)
Version	Number of Servers	Percent
1.48	91	44.83%
3.32	65	32.02%
3.21c	18	8.87%
1.44	7	3.45%
3.31	7	3.45%
1.47	6	2.96%
3.21	3	1.48%
Other	6	2.96%
Neon Mail Server (184 servers)
Version	Number of Servers	Percent
3.0.7	48	26.09%
3.0.9	41	22.28%
3.1.2	36	19.57%
3.1.0	26	14.13%
3.1.3	18	9.78%
3.0.8	6	3.26%
3.0.6	5	2.72%
3.0.5	2	1.09%
Other	2	1.09%
MAILsweeper (100 servers)
Version	Number of Servers	Percent
4.3.20.0	20	20.00%
4.3.14.0	17	17.00%
4.3.17.0	16	16.00%
4.3.19.0	11	11.00%
4.3.12.0	9	9.00%
4.2.10.0	7	7.00%
4.3.1.0	6	6.00%
4.3.6.0	5	5.00%
4.2.5.0	3	3.00%
4.3.10.0	3	3.00%
4.2.1.0	2	2.00%
4.1.5.0	1	1.00%
Other	0	0.00%
MessageWall (93 servers)
Version	Number of Servers	Percent
1.0.8	72	77.42%
1.0.11	18	19.35%
1.1.0	2	2.15%
1.0.6	1	1.08%
Other	0	0.00%
WebSTAR (89 servers)
Version	Number of Servers	Percent
Other	89	100.00%
OpenVMS (36 servers)
Version	Number of Servers	Percent
8.2	10	27.78%
8.3	10	27.78%
7.3	10	27.78%
7.2	5	13.89%
6.1	1	2.78%
Other	0	0.00%