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	1,731,835	100.0%
Number of Servers that didn't respond	247,407	14.29%
Server didn't open socket	238,660	13.78%
Server didn't provide banner	8,747	0.51%
Server provided banner	1,484,428	85.71%
Server banner identifies software in use	915,105	52.84%

As indicated by the above table, of the 1,731,835 servers queried, only 915,105 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	277,139	30.28%
Microsoft	198,313	21.67%
Exim	177,128	19.36%
Postfix	130,052	14.21%
IMail	32,514	3.55%
MDaemon	22,063	2.41%
MailEnable	20,414	2.23%
Merak	8,787	0.96%
Lotus Domino	7,882	0.86%
CommuniGate Pro	5,176	0.57%
Trend Micro	4,768	0.52%
Kerio	4,606	0.50%
WinWebMail	4,449	0.49%
GroupWise	3,864	0.42%
ArGoSoft	3,078	0.34%
XMail	2,562	0.28%
SurgeSMTP	1,753	0.19%
Gordano Messaging Suite (GMS)	1,419	0.16%
Qmail Toaster	1,373	0.15%
Post.Office	1,198	0.13%
NetIQ MailMarshal	1,169	0.13%
InterScan VirusWall	1,129	0.12%
Interscan	951	0.10%
VisNetic	646	0.07%
Mirapoint	557	0.06%
ModusMail	554	0.06%
Mercury	306	0.03%
WebSTAR V	295	0.03%
MagicMail	277	0.03%
MAILsweeper	213	0.02%
Neon Mail Server	187	0.02%
MessageWall	125	0.01%
WebSTAR	123	0.01%
OpenVMS	35	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (277,139 servers)
Version	Number of Servers	Percent
8.12.11.20060614	47,890	17.28%
8.12.11.20060308	33,778	12.19%
8.11.6	29,398	10.61%
8.13.6	27,517	9.93%
8.13.1	25,529	9.21%
8.12.10	20,345	7.34%
8.13.8	15,507	5.60%
8.12.11	12,429	4.48%
8.13.6.20060614	10,113	3.65%
8.13.4	9,800	3.54%
8.12.8	8,969	3.24%
8.13.7	6,169	2.23%
8.10.2	5,778	2.08%
8.9.3	5,492	1.98%
8.13.3	2,835	1.02%
Other	15,590	5.63%
Microsoft (198,313 servers)
Version	Number of Servers	Percent
6.0.3790.1830	113,846	57.41%
6.0.3790.3959	31,334	15.80%
5.0.2195.6713	30,387	15.32%
6.0.3790.211	14,671	7.40%
6.0.3790.0	2,104	1.06%
5.5.2653.13	2,006	1.01%
Other	3,965	2.00%
Exim (177,128 servers)
Version	Number of Servers	Percent
4.63	117,469	66.32%
4.66	11,919	6.73%
4.52	10,618	5.99%
4.50	9,587	5.41%
4.60	7,801	4.40%
4.62	4,046	2.28%
4.44	2,832	1.60%
Other	12,856	7.26%
Postfix (130,052 servers)
Version	Number of Servers	Percent
Other	130,052	100.00%
IMail (32,514 servers)
Version	Number of Servers	Percent
8.15	6,198	19.06%
8.22	6,124	18.83%
8.05	4,091	12.58%
9.10	3,094	9.52%
9.20	2,081	6.40%
7.07	1,342	4.13%
7.15	1,327	4.08%
6.06	1,095	3.37%
8.21	939	2.89%
8.00	631	1.94%
9.04	568	1.75%
8.20	513	1.58%
8.10	454	1.40%
8.02	400	1.23%
8.13	361	1.11%
8.12	353	1.09%
8.01	327	1.01%
Other	2,616	8.05%
MDaemon (22,063 servers)
Version	Number of Servers	Percent
9.5.6	5,417	24.55%
8.1.3	1,439	6.52%
9.0.4	1,238	5.61%
6.8.5	899	4.07%
9.5.4	879	3.98%
9.5.5	794	3.60%
7.2.3	752	3.41%
7.2.0	666	3.02%
9.5.1	656	2.97%
9.5.2	638	2.89%
9.0.1	612	2.77%
9.5.3	581	2.63%
8.1.4	569	2.58%
8.0.2	510	2.31%
9.0.0	506	2.29%
9.0.6	458	2.08%
8.0.3	426	1.93%
8.1.1	408	1.85%
9.0.7	385	1.75%
7.1.2	345	1.56%
8.1.5	338	1.53%
7.1.0	315	1.43%
7.2.2	302	1.37%
7.2.1	269	1.22%
8.0.1	257	1.16%
6.8.4	255	1.16%
7.0.1	255	1.16%
9.0.5	232	1.05%
Other	1,662	7.53%
MailEnable (20,414 servers)
Version	Number of Servers	Percent
1.981--	3,763	18.43%
1.96--	2,169	10.63%
1.8--	1,759	8.62%
1.95--	1,701	8.33%
1.9--	1,699	8.32%
0-2.37-	1,603	7.85%
0-1.85-	1,095	5.36%
0--2.37	897	4.39%
0-2.36-	771	3.78%
0-1.841-	362	1.77%
0--2.36	309	1.51%
0-1.54-	260	1.27%
0-1.75-	260	1.27%
1.73--	235	1.15%
0-2.32-	206	1.01%
Other	3,325	16.29%
Merak (8,787 servers)
Version	Number of Servers	Percent
8.9.1	2,125	24.18%
8.0.3	2,035	23.16%
8.5.0	874	9.95%
8.3.8	394	4.48%
7.4.5	384	4.37%
7.5.2	339	3.86%
7.6.4	301	3.43%
8.9.0	195	2.22%
7.4.2	194	2.21%
7.2.0	163	1.86%
8.2.4	160	1.82%
6.2.1	112	1.27%
8.3.0	107	1.22%
7.4.0	99	1.13%
Other	1,305	14.85%
Lotus Domino (7,882 servers)
Version	Number of Servers	Percent
7.0.2	918	11.65%
6.5.4	670	8.50%
7.0.1	648	8.22%
6.5.1	586	7.43%
6.5.3	477	6.05%
7.0.2FP1	465	5.90%
6.5.5	431	5.47%
7.0	392	4.97%
6.5	338	4.29%
6.5.2	261	3.31%
5.0.11	253	3.21%
6.5.5FP2	189	2.40%
5.0.12	180	2.28%
7.0.1FP1	167	2.12%
5.0.8	153	1.94%
5.0.10	147	1.87%
5.0.13a	136	1.73%
6.5.4FP2	116	1.47%
6.5.4FP3	111	1.41%
6.0.2CF1	104	1.32%
6.0.3	100	1.27%
6.0	97	1.23%
6.5.5FP1	87	1.10%
6.5.4FP1	80	1.01%
5.0.9	80	1.01%
Other	696	8.83%
CommuniGate Pro (5,176 servers)
Version	Number of Servers	Percent
4.1.8	688	13.29%
4.2.10	501	9.68%
5.1.7	301	5.82%
5.1.8	299	5.78%
5.0.9	290	5.60%
5.0.13	176	3.40%
5.1.5	133	2.57%
4.2.8	130	2.51%
4.2.7	122	2.36%
5.0.8	120	2.32%
5.1.3	119	2.30%
5.0.11	116	2.24%
4.2	115	2.22%
5.1.6	108	2.09%
4.3.12	102	1.97%
4.2.9	102	1.97%
4.3.8	98	1.89%
4.0.1	94	1.82%
4.0.6	89	1.72%
5.1.4	74	1.43%
3.5.9	71	1.37%
5.1.2	71	1.37%
5.0.10	61	1.18%
5.0.6	59	1.14%
5.1.1	59	1.14%
4.2.4	55	1.06%
Other	1,023	19.76%
Trend Micro (4,768 servers)
Version	Number of Servers	Percent
5.5	2,245	47.08%
5.7	1,969	41.30%
5.18	480	10.07%
Other	74	1.55%
Kerio (4,606 servers)
Version	Number of Servers	Percent
6.3.1	1,954	42.42%
6.3.0	529	11.49%
6.2.2	229	4.97%
6.1.3	181	3.93%
6.1.2	180	3.91%
6.2.0	178	3.86%
6.1.0	164	3.56%
6.1.4	138	3.00%
6.0.10	133	2.89%
6.0.3	91	1.98%
6.1.1	87	1.89%
6.4.0	70	1.52%
6.2.1	62	1.35%
6.0.8	60	1.30%
5.7.10	56	1.22%
6.0.9	55	1.19%
Other	439	9.53%
WinWebMail (4,449 servers)
Version	Number of Servers	Percent
3.7.3.1	1,273	28.61%
3.7.1.1	1,095	24.61%
3.6.3.1	779	17.51%
3.7.0.5	520	11.69%
3.7.0.7	403	9.06%
3.7.0.3	328	7.37%
Other	51	1.15%
GroupWise (3,864 servers)
Version	Number of Servers	Percent
7.0.1	1,153	29.84%
6.5.7	431	11.15%
6.5.4	405	10.48%
7.0.2	259	6.70%
6.0.4	257	6.65%
6.5.6	239	6.19%
7.0	217	5.62%
6.5.5	194	5.02%
6.5.1	164	4.24%
6.5.3	82	2.12%
6.5.2	80	2.07%
6.0.2	79	2.04%
6.0.3	71	1.84%
5.5.5	63	1.63%
6.5.0	46	1.19%
6.0.1	45	1.16%
Other	79	2.04%
ArGoSoft (3,078 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	692	22.48%
1.8 (1.8.8.7)	463	15.04%
1.8 (1.8.9.1)	343	11.14%
1.8 (1.8.8.9)	309	10.04%
1.8 (1.8.9.0)	173	5.62%
1.8 (1.8.8.1)	90	2.92%
1.8 (1.8.6.0)	81	2.63%
1.8 (1.8.8.2)	64	2.08%
1.8 (1.8.8.3)	63	2.05%
1.8 (1.8.8.5)	54	1.75%
1.8 (1.8.5.9)	49	1.59%
1.8 (1.8.7.5)	44	1.43%
1.8 (1.8.8.4)	44	1.43%
1.8 (1.8.8.9	43	1.40%
1.8 (1.8.6.6)	34	1.10%
1.8 (1.8.8.6)	32	1.04%
Other	500	16.24%
XMail (2,562 servers)
Version	Number of Servers	Percent
1.22	950	37.08%
1.21	427	16.67%
1.24	317	12.37%
1.20	216	8.43%
1.17	183	7.14%
1.23	144	5.62%
1.12	85	3.32%
1.18	58	2.26%
1.16	39	1.52%
1.10	30	1.17%
1.15	26	1.01%
Other	87	3.40%
SurgeSMTP (1,753 servers)
Version	Number of Servers	Percent
3.8i-1	388	22.13%
3.8f3-3	363	20.71%
3.7b8-8	239	13.63%
3.8f2-2	166	9.47%
3.6f5-5	124	7.07%
3.5b3-3	74	4.22%
3.0c2-2	61	3.48%
3.7b6-6	52	2.97%
2.1c7-7	26	1.48%
3.8g-21	26	1.48%
2.0g2-1	23	1.31%
1.8g3	18	1.03%
Other	193	11.01%
Gordano Messaging Suite (GMS) (1,419 servers)
Version	Number of Servers	Percent
Other	1,419	100.00%
Qmail Toaster (1,373 servers)
Version	Number of Servers	Percent
1.3	774	56.37%
1.2	485	35.32%
1.0	113	8.23%
Other	1	0.07%
Post.Office (1,198 servers)
Version	Number of Servers	Percent
3.5.3	369	30.80%
3.5.3J	101	8.43%
4.0.1	77	6.43%
3.8.3	74	6.18%
3.6.3	66	5.51%
3.6.2	46	3.84%
3.1.2J	45	3.76%
3.9.1	43	3.59%
3.1.2	33	2.75%
3.9.2.3	31	2.59%
3.9.2	29	2.42%
3.9.0	28	2.34%
3.5.2	26	2.17%
3.8.4	24	2.00%
4.0.0.2	23	1.92%
3.8.7.4	22	1.84%
3.6.0	21	1.75%
3.9.1.3	13	1.09%
4.0.0.1	12	1.00%
Other	115	9.60%
NetIQ MailMarshal (1,169 servers)
Version	Number of Servers	Percent
6.0.3.8	864	73.91%
5.5.6.7	80	6.84%
6.1.3.15	53	4.53%
5.5.5.9	32	2.74%
5.5.4.16	30	2.57%
5.5.6.6	27	2.31%
5.5.6.5	24	2.05%
5.5.5.6	13	1.11%
Other	46	3.93%
InterScan VirusWall (1,129 servers)
Version	Number of Servers	Percent
Other	1,129	100.00%
Interscan (951 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	208	21.87%
3.81-Build_1022	123	12.93%
3.8-Build_3013	100	10.52%
3.55 (build 1029)	86	9.04%
3.53 (build 2011)	85	8.94%
3.53 (build 2017)	72	7.57%
3.53 (build 2013)	42	4.42%
3.55 (build 1020)	34	3.58%
3.53 (build 1493)	31	3.26%
3.52 (build 1375)	26	2.73%
3.8-Build_1080	20	2.10%
3.8-Build_3065	13	1.37%
3.81-Build_1084	13	1.37%
Other	98	10.30%
VisNetic (646 servers)
Version	Number of Servers	Percent
8.5.0.8	124	19.20%
7.2.4.1	58	8.98%
5.8.6.6	42	6.50%
8.0.3.0	42	6.50%
5.0.2.3	37	5.73%
8.3.5.0	36	5.57%
8.0.3.1	36	5.57%
6.2.2.0	36	5.57%
7.6.1.0	29	4.49%
5.5.8.3	29	4.49%
8.3.6	25	3.87%
8.0.3	19	2.94%
5.4.5.4	17	2.63%
8.5.0.5	15	2.32%
5.3.5.0	14	2.17%
7.5.3.0	13	2.01%
8.3.0.1	10	1.55%
7.2.4.0	9	1.39%
5.8.6.4	7	1.08%
5.0.1	7	1.08%
Other	41	6.35%
Mirapoint (557 servers)
Version	Number of Servers	Percent
3.8.3-GA	130	23.34%
3.7.5a-GA	104	18.67%
3.8.2-GA	75	13.46%
3.7.3a-GA	39	7.00%
3.7.4b-GA	35	6.28%
3.8.4-GA	34	6.10%
3.7.5-GA	24	4.31%
3.7.2-GA	17	3.05%
3.7.1-GA	13	2.33%
3.5.8-GR	13	2.33%
1.1.0	10	1.80%
3.7.0-GA	8	1.44%
3.6.6-GR	8	1.44%
3.7.3-GA	7	1.26%
Other	40	7.18%
ModusMail (554 servers)
Version	Number of Servers	Percent
4.35.480.0	344	62.09%
3.2.315.0	35	6.32%
4.1.361.21	28	5.05%
4.2.425.22	27	4.87%
4.35.477.0	21	3.79%
3.1.297.0	17	3.07%
3.1.302.0	11	1.99%
4.35.480.11	11	1.99%
4.3.459.0	10	1.81%
3.0.273.0	9	1.62%
4.2.425.4	6	1.08%
Other	35	6.32%
Mercury (306 servers)
Version	Number of Servers	Percent
1.48	135	44.12%
3.32	106	34.64%
3.21c	24	7.84%
3.31	14	4.58%
1.44	13	4.25%
1.47	7	2.29%
Other	7	2.29%
WebSTAR V (295 servers)
Version	Number of Servers	Percent
5.4.0	87	29.49%
5.4.1	83	28.14%
5.3.4	62	21.02%
5.3.3	29	9.83%
5.3.2	21	7.12%
5.3.0	9	3.05%
5.2.4	3	1.02%
Other	1	0.34%
MagicMail (277 servers)
Version	Number of Servers	Percent
Other	277	100.00%
MAILsweeper (213 servers)
Version	Number of Servers	Percent
4.3.20.0	39	18.31%
4.3.12.0	35	16.43%
4.3.17.0	32	15.02%
4.3.19.0	30	14.08%
4.3.14.0	27	12.68%
4.2.10.0	11	5.16%
4.2.1.0	9	4.23%
4.3.1.0	8	3.76%
4.3.10.0	8	3.76%
4.3.6.0	7	3.29%
4.2.5.0	4	1.88%
Other	3	1.41%
Neon Mail Server (187 servers)
Version	Number of Servers	Percent
3.0.9	80	42.78%
3.0.7	61	32.62%
3.1.0	24	12.83%
3.0.8	10	5.35%
3.0.6	9	4.81%
3.0.4	2	1.07%
Other	1	0.53%
MessageWall (125 servers)
Version	Number of Servers	Percent
1.0.8	97	77.60%
1.0.11	16	12.80%
1.1.23	7	5.60%
1.0.6	2	1.60%
1.1.0	2	1.60%
Other	1	0.80%
WebSTAR (123 servers)
Version	Number of Servers	Percent
Other	123	100.00%
OpenVMS (35 servers)
Version	Number of Servers	Percent
7.3	13	37.14%
8.2	9	25.71%
8.3	7	20.00%
7.2	5	14.29%
6.1	1	2.86%
Other	0	0.00%