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	1,844,209	100.0%
Number of Servers that didn't respond	281,442	15.26%
Server didn't open socket	270,384	14.66%
Server didn't provide banner	11,058	0.60%
Server provided banner	1,562,767	84.74%
Server banner identifies software in use	926,844	50.26%

As indicated by the above table, of the 1,844,209 servers queried, only 926,844 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	240,254	25.92%
Exim	207,801	22.42%
Microsoft	205,319	22.15%
Postfix	150,372	16.22%
IMail	25,639	2.77%
MailEnable	23,709	2.56%
MDaemon	23,186	2.50%
Lotus Domino	7,036	0.76%
Merak	6,378	0.69%
Kerio	5,645	0.61%
WinWebMail	4,906	0.53%
CommuniGate Pro	4,903	0.53%
Trend Micro	3,322	0.36%
GroupWise	3,041	0.33%
XMail	2,713	0.29%
ArGoSoft	2,654	0.29%
SurgeSMTP	1,758	0.19%
Qmail Toaster	1,661	0.18%
Gordano Messaging Suite (GMS)	1,008	0.11%
Post.Office	951	0.10%
NetIQ MailMarshal	722	0.08%
InterScan VirusWall	688	0.07%
Mirapoint	579	0.06%
Interscan	547	0.06%
VisNetic	544	0.06%
MagicMail	373	0.04%
ModusMail	227	0.02%
WebSTAR V	216	0.02%
Mercury	202	0.02%
Neon Mail Server	183	0.02%
MAILsweeper	98	0.01%
MessageWall	89	0.01%
WebSTAR	87	0.01%
OpenVMS	33	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (240,254 servers)
Version	Number of Servers	Percent
8.12.11.20060614	35,803	14.90%
8.13.1	32,448	13.51%
8.12.11.20060308	25,648	10.68%
8.13.6	22,967	9.56%
8.11.6	20,230	8.42%
8.13.8	16,846	7.01%
8.12.10	14,471	6.02%
8.13.6.20060614	10,720	4.46%
8.14.1	9,441	3.93%
8.12.11	8,683	3.61%
8.13.4	7,401	3.08%
8.12.8	6,389	2.66%
8.13.7	5,832	2.43%
8.14.2	4,941	2.06%
8.9.3	3,572	1.49%
8.10.2	3,172	1.32%
Other	11,690	4.87%
Exim (207,801 servers)
Version	Number of Servers	Percent
4.68	135,343	65.13%
4.63	30,193	14.53%
4.60	6,962	3.35%
4.66	5,997	2.89%
4.50	5,978	2.88%
4.67	5,939	2.86%
4.62	4,130	1.99%
4.69	3,269	1.57%
Other	9,990	4.81%
Microsoft (205,319 servers)
Version	Number of Servers	Percent
6.0.3790.3959	125,937	61.34%
6.0.3790.1830	47,551	23.16%
5.0.2195.6713	19,502	9.50%
6.0.3790.211	7,522	3.66%
Other	4,807	2.34%
Postfix (150,372 servers)
Version	Number of Servers	Percent
Other	150,372	100.00%
IMail (25,639 servers)
Version	Number of Servers	Percent
8.22	5,214	20.34%
8.15	4,626	18.04%
9.23	2,268	8.85%
8.05	1,677	6.54%
9.10	1,511	5.89%
9.21	1,276	4.98%
7.07	1,050	4.10%
7.15	927	3.62%
9.22	912	3.56%
9.20	697	2.72%
6.06	689	2.69%
8.21	621	2.42%
8.00	571	2.23%
8.20	358	1.40%
8.04	351	1.37%
8.10	317	1.24%
8.01	316	1.23%
Other	2,258	8.81%
MailEnable (23,709 servers)
Version	Number of Servers	Percent
1.981--	6,041	25.48%
1.983--	2,557	10.78%
1.96--	1,716	7.24%
1.95--	1,510	6.37%
1.9--	1,301	5.49%
1.8--	1,068	4.50%
0-1.85-	1,046	4.41%
0-2.37-	929	3.92%
0-3.04-	564	2.38%
0-2.38-	528	2.23%
0-2.36-	465	1.96%
0-2.40-	372	1.57%
0--2.37	366	1.54%
0--2.38	319	1.35%
0-3.12-	269	1.13%
0--3.04	265	1.12%
Other	4,393	18.53%
MDaemon (23,186 servers)
Version	Number of Servers	Percent
9.6.4	5,519	23.80%
9.6.2	1,607	6.93%
9.6.3	1,488	6.42%
9.6.1	1,299	5.60%
9.5.6	1,173	5.06%
8.1.3	1,045	4.51%
9.0.4	983	4.24%
9.5.2	776	3.35%
9.5.1	706	3.04%
6.8.5	632	2.73%
7.2.3	573	2.47%
7.2.0	466	2.01%
9.0.1	465	2.01%
9.5.5	394	1.70%
9.0.0	383	1.65%
8.1.4	381	1.64%
8.0.2	372	1.60%
9.5.4	360	1.55%
8.1.1	317	1.37%
9.6.0	307	1.32%
8.0.3	265	1.14%
9.5.3	264	1.14%
7.1.2	264	1.14%
8.1.5	252	1.09%
Other	2,895	12.49%
Lotus Domino (7,036 servers)
Version	Number of Servers	Percent
7.0.2	919	13.06%
7.0.2FP2	476	6.77%
6.5.4	471	6.69%
7.0.1	459	6.52%
6.5.1	398	5.66%
8.0	378	5.37%
6.5.3	354	5.03%
7.0.3	341	4.85%
6.5.5	304	4.32%
7.0	298	4.24%
7.0.2FP1	243	3.45%
6.5	242	3.44%
5.0.11	165	2.35%
6.5.2	153	2.17%
8.0.1	113	1.61%
5.0.12	102	1.45%
5.0.8	99	1.41%
6.5.5FP2	93	1.32%
5.0.13a	89	1.26%
6.5.6	88	1.25%
5.0.10	88	1.25%
7.0.1FP1	85	1.21%
6.0.2CF1	73	1.04%
6.5.4FP3	72	1.02%
6.5.4FP2	71	1.01%
Other	862	12.25%
Merak (6,378 servers)
Version	Number of Servers	Percent
8.0.3	2,143	33.60%
8.9.1	810	12.70%
8.5.0	478	7.49%
7.4.5	318	4.99%
7.5.2	296	4.64%
8.3.8	292	4.58%
7.6.4	265	4.15%
9.0.0	195	3.06%
7.4.2	151	2.37%
7.2.0	115	1.80%
8.2.4	100	1.57%
6.2.1	88	1.38%
8.9.0	80	1.25%
7.6.1	76	1.19%
8.3.0	73	1.14%
7.4.0	67	1.05%
Other	831	13.03%
Kerio (5,645 servers)
Version	Number of Servers	Percent
6.4.2	1,094	19.38%
6.4.1	1,045	18.51%
6.3.1	793	14.05%
6.5.0	621	11.00%
6.4.0	557	9.87%
6.3.0	261	4.62%
6.2.2	122	2.16%
6.1.3	112	1.98%
6.2.0	100	1.77%
6.1.2	97	1.72%
6.1.0	95	1.68%
6.0.10	86	1.52%
6.1.4	83	1.47%
6.0.3	72	1.28%
6.1.1	57	1.01%
Other	450	7.97%
WinWebMail (4,906 servers)
Version	Number of Servers	Percent
3.7.3.1	1,617	32.96%
3.7.1.1	893	18.20%
3.7.5.1	643	13.11%
3.6.3.1	487	9.93%
3.7.0.5	411	8.38%
3.7.6.1	279	5.69%
3.7.0.7	266	5.42%
3.7.0.3	253	5.16%
Other	57	1.16%
CommuniGate Pro (4,903 servers)
Version	Number of Servers	Percent
4.1.8	516	10.52%
4.2.10	331	6.75%
5.1.13	324	6.61%
5.1.12	300	6.12%
5.1.14	261	5.32%
5.2.0	223	4.55%
5.1.10	197	4.02%
5.0.9	167	3.41%
5.0.13	160	3.26%
5.1.9	126	2.57%
5.1.11	120	2.45%
5.1.7	116	2.37%
5.1.8	109	2.22%
4.2.8	91	1.86%
4.2.7	84	1.71%
4.2	78	1.59%
5.1.5	77	1.57%
4.3.12	75	1.53%
5.0.11	73	1.49%
4.0.6	71	1.45%
4.2.9	69	1.41%
5.0.8	68	1.39%
5.2	65	1.33%
5.0.14	57	1.16%
5.1.3	57	1.16%
4.3.8	56	1.14%
Other	1,032	21.05%
Trend Micro (3,322 servers)
Version	Number of Servers	Percent
5.7	1,536	46.24%
5.5	1,228	36.97%
5.18	427	12.85%
7.0	77	2.32%
Other	54	1.63%
GroupWise (3,041 servers)
Version	Number of Servers	Percent
7.0.2	1,073	35.28%
7.0.1	420	13.81%
6.5.7	370	12.17%
6.5.4	227	7.46%
6.5.6	166	5.46%
6.0.4	143	4.70%
7.0	113	3.72%
6.5.5	107	3.52%
6.5.1	100	3.29%
7.0.3	45	1.48%
6.5.2	44	1.45%
6.0.2	39	1.28%
6.5.3	37	1.22%
6.0.3	34	1.12%
Other	123	4.04%
XMail (2,713 servers)
Version	Number of Servers	Percent
1.22	886	32.66%
1.24	610	22.48%
1.21	329	12.13%
1.25	224	8.26%
1.20	147	5.42%
1.17	139	5.12%
1.23	125	4.61%
1.12	83	3.06%
1.16	43	1.58%
1.18	36	1.33%
Other	91	3.35%
ArGoSoft (2,654 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.3)	558	21.02%
1.8 (1.8.9.1)	471	17.75%
1.8 (1.8.8.8)	297	11.19%
1.8 (1.8.8.7)	259	9.76%
1.8 (1.8.9.2)	215	8.10%
1.8 (1.8.8.9)	118	4.45%
1.8 (1.8.9.0)	60	2.26%
1.8 (1.8.8.1)	55	2.07%
1.8 (1.8.6.0)	52	1.96%
1.8 (1.8.8.2)	51	1.92%
1.8 (1.8.5.9)	33	1.24%
1.8 (1.8.8.3)	31	1.17%
1.8 (1.8.7.5)	29	1.09%
1.8 (1.8.8.4)	28	1.06%
Other	397	14.96%
SurgeSMTP (1,758 servers)
Version	Number of Servers	Percent
3.8k4-4	692	39.36%
3.8i3-3	178	10.13%
3.7b8-8	102	5.80%
3.8f3-3	95	5.40%
3.6f5-5	69	3.92%
3.5b3-3	62	3.53%
3.8f2-2	56	3.19%
3.9a-1	42	2.39%
3.0c2-2	42	2.39%
3.8k2-2	41	2.33%
3.8t-5	37	2.10%
3.7b6-6	34	1.93%
3.8i-1	24	1.37%
3.8m-1	22	1.25%
2.1c7-7	20	1.14%
3.8o-1	20	1.14%
3.8k-1	18	1.02%
Other	204	11.60%
Qmail Toaster (1,661 servers)
Version	Number of Servers	Percent
1.3	1,226	73.81%
1.2	351	21.13%
1.0	69	4.15%
Other	15	0.90%
Gordano Messaging Suite (GMS) (1,008 servers)
Version	Number of Servers	Percent
Other	1,008	100.00%
Post.Office (951 servers)
Version	Number of Servers	Percent
3.5.3	241	25.34%
4.0.1	90	9.46%
3.5.3J	75	7.89%
3.6.3	56	5.89%
3.8.3	52	5.47%
3.6.2	39	4.10%
3.9.1	36	3.79%
3.9.2.3	33	3.47%
3.1.2J	30	3.15%
3.9.2	24	2.52%
3.8.7.4	22	2.31%
3.1.2	22	2.31%
3.9.0	22	2.31%
3.8.4	21	2.21%
3.9.1.3	15	1.58%
4.1	15	1.58%
3.5.2	15	1.58%
4.0.0.2	15	1.58%
3.8.2	12	1.26%
3.6.0	12	1.26%
3.9.2.1	11	1.16%
4.0.0.1	11	1.16%
Other	82	8.62%
NetIQ MailMarshal (722 servers)
Version	Number of Servers	Percent
6.0.3.8	556	77.01%
5.5.6.7	40	5.54%
6.1.3.15	36	4.99%
5.5.6.6	16	2.22%
5.5.4.16	16	2.22%
5.5.5.9	15	2.08%
5.5.6.5	11	1.52%
5.5.5.6	8	1.11%
Other	24	3.32%
InterScan VirusWall (688 servers)
Version	Number of Servers	Percent
Other	688	100.00%
Mirapoint (579 servers)
Version	Number of Servers	Percent
3.8.4-GA	112	19.34%
3.8.3-GA	102	17.62%
3.8.5-GA	76	13.13%
3.8.6-GA	64	11.05%
3.7.5a-GA	55	9.50%
3.8.2-GA	41	7.08%
3.7.3a-GA	27	4.66%
3.7.4b-GA	24	4.15%
3.7.5-GA	13	2.25%
3.5.8-GR	10	1.73%
1.1.0	8	1.38%
3.7.2-GA	7	1.21%
3.7.1-GA	6	1.04%
Other	34	5.87%
Interscan (547 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	89	16.27%
3.8-Build_3013	68	12.43%
3.81-Build_1022	61	11.15%
3.55 (build 1029)	53	9.69%
3.53 (build 2017)	50	9.14%
3.53 (build 2011)	43	7.86%
3.81-Build_1084	39	7.13%
3.53 (build 2013)	24	4.39%
3.53 (build 1493)	20	3.66%
3.52 (build 1375)	15	2.74%
3.55 (build 1020)	14	2.56%
3.8-Build_1080	9	1.65%
3.81-Build_1055	7	1.28%
3.55 (build 1018)	6	1.10%
Other	49	8.96%
VisNetic (544 servers)
Version	Number of Servers	Percent
9.1.4.1	95	17.46%
9.1.4.0	53	9.74%
8.5.0.8	44	8.09%
7.2.4.1	37	6.80%
5.8.6.6	34	6.25%
8.3.5.0	28	5.15%
8.0.3.0	28	5.15%
5.0.2.3	25	4.60%
5.5.8.3	23	4.23%
8.0.3.1	19	3.49%
6.2.2.0	19	3.49%
7.6.1.0	16	2.94%
8.0.3	15	2.76%
5.3.5.0	13	2.39%
5.4.5.4	11	2.02%
7.5.3.0	10	1.84%
8.3.6	9	1.65%
8.5.0.5	9	1.65%
7.2.4.0	7	1.29%
5.8.6.4	6	1.10%
8.3.0.1	6	1.10%
6.0.9.0	6	1.10%
Other	31	5.70%
MagicMail (373 servers)
Version	Number of Servers	Percent
Other	373	100.00%
ModusMail (227 servers)
Version	Number of Servers	Percent
4.35.480.0	83	36.56%
3.2.315.0	29	12.78%
4.2.425.22	26	11.45%
4.1.361.21	23	10.13%
4.35.477.0	14	6.17%
3.1.302.0	10	4.41%
4.3.459.0	9	3.96%
4.35.480.11	8	3.52%
4.2.420.0	4	1.76%
4.1.361.0	4	1.76%
4.0.340.0	3	1.32%
Other	14	6.17%
WebSTAR V (216 servers)
Version	Number of Servers	Percent
5.4.0	65	30.09%
5.4.1	60	27.78%
5.3.4	47	21.76%
5.3.3	19	8.80%
5.3.2	17	7.87%
5.3.0	6	2.78%
Other	2	0.93%
Mercury (202 servers)
Version	Number of Servers	Percent
1.48	94	46.53%
3.32	63	31.19%
3.21c	18	8.91%
1.44	7	3.47%
3.31	7	3.47%
1.47	6	2.97%
Other	7	3.47%
Neon Mail Server (183 servers)
Version	Number of Servers	Percent
3.0.7	46	25.14%
3.0.9	40	21.86%
3.1.2	32	17.49%
3.1.0	24	13.11%
3.1.3	24	13.11%
3.0.8	6	3.28%
3.0.6	5	2.73%
3.1.1	3	1.64%
3.0.5	2	1.09%
Other	1	0.55%
MAILsweeper (98 servers)
Version	Number of Servers	Percent
4.3.20.0	20	20.41%
4.3.14.0	17	17.35%
4.3.17.0	16	16.33%
4.3.19.0	12	12.24%
4.3.12.0	7	7.14%
4.2.10.0	7	7.14%
4.3.1.0	7	7.14%
4.3.6.0	3	3.06%
4.2.5.0	3	3.06%
4.3.10.0	3	3.06%
4.2.1.0	2	2.04%
4.1.5.0	1	1.02%
Other	0	0.00%
MessageWall (89 servers)
Version	Number of Servers	Percent
1.0.8	68	76.40%
1.0.11	18	20.22%
1.1.0	2	2.25%
1.0.6	1	1.12%
Other	0	0.00%
WebSTAR (87 servers)
Version	Number of Servers	Percent
Other	87	100.00%
OpenVMS (33 servers)
Version	Number of Servers	Percent
8.3	10	30.30%
8.2	9	27.27%
7.3	8	24.24%
7.2	5	15.15%
6.1	1	3.03%
Other	0	0.00%