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	2,339,420	100.0%
Number of Servers that didn't respond	387,453	16.56%
Server didn't open socket	377,199	16.12%
Server didn't provide banner	10,254	0.44%
Server provided banner	1,951,967	83.44%
Server banner identifies software in use	1,072,486	45.84%

As indicated by the above table, of the 2,339,420 servers queried, only 1,072,486 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
Exim	517,114	48.22%
Postfix	262,939	24.52%
Sendmail	117,270	10.93%
Microsoft	93,515	8.72%
MailEnable	33,012	3.08%
MDaemon	20,086	1.87%
IMail	7,272	0.68%
Lotus Domino	4,354	0.41%
WinWebMail	3,156	0.29%
CommuniGate Pro	3,068	0.29%
XMail	2,080	0.19%
Kerio	1,591	0.15%
Qmail Toaster	1,586	0.15%
Merak	1,199	0.11%
SurgeSMTP	1,025	0.10%
ArGoSoft	713	0.07%
GroupWise	517	0.05%
Gordano Messaging Suite (GMS)	336	0.03%
Post.Office	335	0.03%
Trend Micro	333	0.03%
MagicMail	307	0.03%
Mirapoint	163	0.02%
InterScan VirusWall	128	0.01%
VisNetic	123	0.01%
Mercury	46	0.00%
Interscan	43	0.00%
NetIQ MailMarshal	34	0.00%
WebSTAR V	31	0.00%
Neon Mail Server	26	0.00%
OpenVMS	20	0.00%
MessageWall	17	0.00%
OpenSMTPD	16	0.00%
WebSTAR	14	0.00%
ModusMail	14	0.00%
MAILsweeper	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (517,114 servers)
Version	Number of Servers	Percent
4.80	331,806	64.16%
4.76	50,059	9.68%
4.77	45,887	8.87%
4.69	32,845	6.35%
4.72	23,533	4.55%
4.80.1	7,226	1.40%
4.67	6,074	1.17%
Other	19,684	3.81%
Postfix (262,939 servers)
Version	Number of Servers	Percent
Other	262,939	100.00%
Sendmail (117,270 servers)
Version	Number of Servers	Percent
8.13.8	31,285	26.68%
8.13.1	18,396	15.69%
8.14.3	15,635	13.33%
8.14.5	13,046	11.12%
8.14.4	11,169	9.52%
8.12.11.20060308	4,580	3.91%
8.13.6.20060614	3,610	3.08%
8.14.2	3,209	2.74%
8.11.6	2,224	1.90%
8.12.10	2,011	1.71%
8.14.1	1,789	1.53%
8.13.6	1,638	1.40%
8.13.7	1,380	1.18%
8.12.11.20060614	1,360	1.16%
8.12.11	1,195	1.02%
Other	4,743	4.04%
Microsoft (93,515 servers)
Version	Number of Servers	Percent
6.0.3790.4675	75,507	80.74%
6.0.3790.3959	10,205	10.91%
6.0.3790.1830	2,794	2.99%
7.5.7601.17514	1,500	1.60%
5.0.2195.7381	988	1.06%
Other	2,521	2.70%
MailEnable (33,012 servers)
Version	Number of Servers	Percent
1.986--	7,056	21.37%
5.10--	2,612	7.91%
4.26--	2,252	6.82%
6.5--	1,317	3.99%
6.0--	1,291	3.91%
1.981--	1,237	3.75%
1.983--	780	2.36%
0-3.63-	696	2.11%
6.03--	636	1.93%
3.62--	614	1.86%
5.51--	607	1.84%
5.11--	524	1.59%
6.60--	501	1.52%
6.53--	456	1.38%
0-1.87-	367	1.11%
Other	12,066	36.55%
MDaemon (20,086 servers)
Version	Number of Servers	Percent
13.0.2	2,654	13.21%
11.0.3	2,005	9.98%
11.0.0	1,272	6.33%
12.5.6	1,244	6.19%
13.0.1	821	4.09%
10.0.0	777	3.87%
10.1.2	692	3.45%
10.1.1	629	3.13%
12.5.4	547	2.72%
13.0.0	517	2.57%
9.6.1	499	2.48%
9.6.6	465	2.32%
10.1.0	428	2.13%
12.5.3	386	1.92%
12.0.3	368	1.83%
12.5.7	313	1.56%
12.5.8	306	1.52%
9.6.2	295	1.47%
9.5.2	276	1.37%
10.0.5	261	1.30%
9.6.5	259	1.29%
12.0.4	247	1.23%
10.0.2	246	1.22%
12.5.2	236	1.17%
9.6.4	222	1.11%
9.5.6	217	1.08%
9.5.1	214	1.07%
Other	3,690	18.37%
IMail (7,272 servers)
Version	Number of Servers	Percent
8.22	1,298	17.85%
11.5	868	11.94%
12.1.0.270	633	8.70%
9.23	458	6.30%
8.15	440	6.05%
11.03	398	5.47%
11.01	356	4.90%
12.2.0.169	337	4.63%
8.05	287	3.95%
10.02	212	2.92%
12.0.0.384	197	2.71%
7.07	164	2.26%
7.15	126	1.73%
6.06	123	1.69%
11.0	120	1.65%
8.00	118	1.62%
11.02	112	1.54%
10.01	110	1.51%
12.0.0.348	101	1.39%
9.21	80	1.10%
9.10	74	1.02%
Other	660	9.08%
Lotus Domino (4,354 servers)
Version	Number of Servers	Percent
8.5.3	788	18.10%
8.5.2	315	7.23%
8.5.3FP2	289	6.64%
8.5.3FP1	229	5.26%
8.5.2FP2	228	5.24%
8.5.1	205	4.71%
7.0.2	182	4.18%
8.5	148	3.40%
8.5.2FP3	132	3.03%
7.0.3	104	2.39%
8.5.2FP4	104	2.39%
8.5.1FP5	95	2.18%
8.5.2FP1	86	1.98%
8.0.1	82	1.88%
7.0.1	81	1.86%
6.5.3	75	1.72%
8.0.2	75	1.72%
6.5.4	74	1.70%
7.0	71	1.63%
6.5.1	68	1.56%
8.0	61	1.40%
6.5.5	49	1.13%
6.5	48	1.10%
8.5.1FP3	45	1.03%
8.5.1FP4	45	1.03%
Other	675	15.50%
WinWebMail (3,156 servers)
Version	Number of Servers	Percent
3.8.1.3	621	19.68%
3.8.0.1	424	13.43%
3.7.6.1	344	10.90%
3.8.1.5	292	9.25%
3.8.2.1	271	8.59%
3.7.3.1	247	7.83%
3.8.1.1	227	7.19%
3.7.7.3	215	6.81%
3.7.1.1	120	3.80%
3.7.5.1	88	2.79%
3.7.7.1	56	1.77%
3.6.3.1	53	1.68%
3.8.3.1	52	1.65%
3.7.0.3	46	1.46%
3.7.0.5	44	1.39%
3.7.0.7	35	1.11%
Other	21	0.67%
CommuniGate Pro (3,068 servers)
Version	Number of Servers	Percent
5.1.16	260	8.47%
4.1.8	127	4.14%
5.4.4	126	4.11%
5.4.8	124	4.04%
5.4.6	119	3.88%
5.2.20	102	3.32%
5.4.7	100	3.26%
5.4.5	90	2.93%
5.3.13	89	2.90%
5.4.1	76	2.48%
4.2.10	74	2.41%
5.2.16	72	2.35%
5.1.12	63	2.05%
5.3.15	62	2.02%
5.4.3	62	2.02%
5.0.14	61	1.99%
5.2.19	60	1.96%
5.2.3	60	1.96%
5.4.2	55	1.79%
5.2.14	48	1.56%
5.2.12	39	1.27%
5.4.0	37	1.21%
5.1.13	37	1.21%
5.3.9	36	1.17%
5.3.8	36	1.17%
5.2.13	34	1.11%
5.4	33	1.08%
5.3.10	33	1.08%
5.2.8	32	1.04%
Other	921	30.02%
XMail (2,080 servers)
Version	Number of Servers	Percent
1.27	557	26.78%
1.22	502	24.13%
1.25	358	17.21%
1.26	238	11.44%
1.24	159	7.64%
1.21	73	3.51%
1.23	45	2.16%
1.20	33	1.59%
1.17	32	1.54%
Other	83	3.99%
Kerio (1,591 servers)
Version	Number of Servers	Percent
6.7.3	259	16.28%
6.6.2	163	10.25%
6.7.0	151	9.49%
6.5.0	122	7.67%
6.5.2	102	6.41%
6.7.2	95	5.97%
6.4.1	92	5.78%
6.7.1	78	4.90%
6.3.1	70	4.40%
6.6.1	56	3.52%
6.4.0	55	3.46%
6.6.0	54	3.39%
6.5.1	47	2.95%
6.4.2	35	2.20%
6.3.0	30	1.89%
6.0.10	18	1.13%
6.1.4	18	1.13%
6.2.0	17	1.07%
6.2.2	16	1.01%
Other	113	7.10%
Qmail Toaster (1,586 servers)
Version	Number of Servers	Percent
1.3	1,501	94.64%
1.2	52	3.28%
Other	33	2.08%
Merak (1,199 servers)
Version	Number of Servers	Percent
8.0.3	470	39.20%
8.9.1	136	11.34%
8.5.0	85	7.09%
7.5.2	55	4.59%
8.3.8	51	4.25%
7.6.4	50	4.17%
7.4.5	48	4.00%
9.0.0	24	2.00%
7.4.2	23	1.92%
7.0.1	17	1.42%
7.6.1	17	1.42%
8.9.0	16	1.33%
7.2.0	15	1.25%
8.2.4	14	1.17%
6.2.1	14	1.17%
4.4.2	14	1.17%
8.3.15	13	1.08%
Other	137	11.43%
SurgeSMTP (1,025 servers)
Version	Number of Servers	Percent
6.1c-1	191	18.63%
5.3h2-2	134	13.07%
5.2a-1	93	9.07%
3.9e-1	58	5.66%
6.2c-1	51	4.98%
6.0a5-5	47	4.59%
6.0a4-4	33	3.22%
3.8k4-4	33	3.22%
4.0u4-4	24	2.34%
5.0e4-4	18	1.76%
4.2d2-2	18	1.76%
4.3g2-2	17	1.66%
3.8i3-3	15	1.46%
3.9h-18	13	1.27%
5.0e3-3	13	1.27%
5.3h-1	12	1.17%
3.6f5-5	12	1.17%
6.0a3-3	12	1.17%
4.2d4-4	11	1.07%
6.2a-1	11	1.07%
Other	209	20.39%
ArGoSoft (713 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	174	24.40%
1.8 (1.8.9.5)	99	13.88%
1.8 (1.8.9.3)	90	12.62%
1.8 (1.8.9.1)	75	10.52%
1.8 (1.8.8.8)	51	7.15%
1.8 (1.8.8.7)	41	5.75%
1.8 (1.8.9.2)	23	3.23%
1.8 (1.8.9.4)	21	2.95%
1.8 (1.8.8.9)	13	1.82%
1.8 (1.8.6.0)	13	1.82%
1.8 (1.8.8.1)	10	1.40%
Other	103	14.45%
GroupWise (517 servers)
Version	Number of Servers	Percent
8.0.2	100	19.34%
7.0.3	95	18.38%
6.5.7	56	10.83%
7.0.4	39	7.54%
7.0.2	34	6.58%
7.0.1	22	4.26%
8.0.1	21	4.06%
6.5.4	20	3.87%
6.5.6	19	3.68%
6.0.4	16	3.09%
8.0.3	14	2.71%
12.0.1	13	2.51%
6.5.1	13	2.51%
12.0.0	10	1.93%
8.0.0	9	1.74%
7.0	8	1.55%
6.5.5	7	1.35%
Other	21	4.06%
Gordano Messaging Suite (GMS) (336 servers)
Version	Number of Servers	Percent
Other	336	100.00%
Post.Office (335 servers)
Version	Number of Servers	Percent
3.5.3	49	14.63%
4.1.0.2	29	8.66%
4.1.2.4	29	8.66%
4.0.1	23	6.87%
4.1.1	16	4.78%
3.5.3J	11	3.28%
3.8.3	11	3.28%
4.2	10	2.99%
4.1.0.3	9	2.69%
3.9.2	9	2.69%
3.9.2.3	9	2.69%
3.1.2	8	2.39%
3.1.2J	8	2.39%
4.1.0.4	8	2.39%
4.0.1.1	7	2.09%
3.8.7.4	7	2.09%
3.9.1.2	6	1.79%
3.6.2	6	1.79%
4.0.0.1	5	1.49%
4.1.2.3	5	1.49%
4.1.2.2	5	1.49%
3.9.1	5	1.49%
3.9.2.2	4	1.19%
4.1	4	1.19%
3.9.1.3	4	1.19%
4.2.1.3	4	1.19%
3.9.2.1	4	1.19%
4.2.1	4	1.19%
4.0.0.2	4	1.19%
4.2.1.1	4	1.19%
Other	28	8.36%
Trend Micro (333 servers)
Version	Number of Servers	Percent
5.7	135	40.54%
5.5	83	24.92%
5.18	54	16.22%
7.0	32	9.61%
7.1	19	5.71%
Other	10	3.00%
MagicMail (307 servers)
Version	Number of Servers	Percent
Other	307	100.00%
Mirapoint (163 servers)
Version	Number of Servers	Percent
3.10.10a-GA	19	11.66%
4.1.10-GA	15	9.20%
4.2.3-GA	11	6.75%
4.3.5-GA	9	5.52%
3.10.9-GA	9	5.52%
3.10.5-GA	8	4.91%
4.1.9-GA	8	4.91%
3.10.8-GA	7	4.29%
4.2.4-GA	7	4.29%
4.1.4-GA	6	3.68%
4.3.3-GA	6	3.68%
4.1.3-GA	5	3.07%
3.8.5-GA	5	3.07%
3.8.3-GA	5	3.07%
3.8.4-GA	5	3.07%
3.10.7-GA	5	3.07%
4.3.4-GA	4	2.45%
4.1.8-GA	4	2.45%
3.8.7a	3	1.84%
4.1.5-GA	3	1.84%
3.10.4-GA	2	1.23%
3.7.5a-GA	2	1.23%
3.10.3-GA	2	1.23%
3.8.6-GA	2	1.23%
3.10.2-GA	2	1.23%
4.0.5a	2	1.23%
Other	7	4.29%
InterScan VirusWall (128 servers)
Version	Number of Servers	Percent
Other	128	100.00%
VisNetic (123 servers)
Version	Number of Servers	Percent
9.3.2.0	37	30.08%
9.1.4.1	17	13.82%
8.5.0.8	8	6.50%
7.6.1.0	6	4.88%
5.5.8.3	6	4.88%
8.0.3	5	4.07%
8.0.3.1	4	3.25%
8.0.3.0	4	3.25%
5.0.2.3	4	3.25%
5.8.6.6	3	2.44%
7.2.4.1	3	2.44%
9.1.4.0	3	2.44%
5.4.5.4	3	2.44%
5.0.2.1	2	1.63%
6.2.2.0	2	1.63%
5.3.5.0	2	1.63%
5.8.6.4	2	1.63%
Other	12	9.76%
Mercury (46 servers)
Version	Number of Servers	Percent
1.48	23	50.00%
3.32	14	30.43%
3.01a	2	4.35%
1.47	2	4.35%
3.21c	2	4.35%
3.21	1	2.17%
4.x	1	2.17%
3.30	1	2.17%
Other	0	0.00%
Interscan (43 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	11	25.58%
3.81-Build_1022	8	18.60%
3.55 (build 1029)	5	11.63%
3.8-Build_3013	3	6.98%
3.53 (build 2017)	3	6.98%
3.81-Build_1084	3	6.98%
3.53 (build 1493)	2	4.65%
3.53 (build 2013)	2	4.65%
3.5 (build 1294)	1	2.33%
3.51 (build 1337)	1	2.33%
3.55 (build 1020)	1	2.33%
3.8-Build_3045	1	2.33%
3.53 (build 2011)	1	2.33%
3.8-Build_1080	1	2.33%
Other	0	0.00%
NetIQ MailMarshal (34 servers)
Version	Number of Servers	Percent
6.0.3.8	23	67.65%
5.5.6.7	4	11.76%
5.5.6.5	2	5.88%
5.5.6.6	2	5.88%
5.5.5.6	1	2.94%
6.1.3.15	1	2.94%
5.5.4.16	1	2.94%
Other	0	0.00%
WebSTAR V (31 servers)
Version	Number of Servers	Percent
5.4.1	16	51.61%
5.4.0	7	22.58%
5.3.3	3	9.68%
5.3.4	3	9.68%
5.3.2	2	6.45%
Other	0	0.00%
Neon Mail Server (26 servers)
Version	Number of Servers	Percent
3.0.7	6	23.08%
3.1.3	5	19.23%
3.1.0	4	15.38%
3.1.4	3	11.54%
3.1.2	3	11.54%
3.0.9	2	7.69%
3.1.1	1	3.85%
3.1.5	1	3.85%
3.0.6	1	3.85%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	10	50.00%
8.4	6	30.00%
7.3	3	15.00%
8.2	1	5.00%
Other	0	0.00%
MessageWall (17 servers)
Version	Number of Servers	Percent
1.0.8	16	94.12%
1.0.6	1	5.88%
Other	0	0.00%
OpenSMTPD (16 servers)
Version	Number of Servers	Percent
Other	16	100.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (14 servers)
Version	Number of Servers	Percent
4.35.477.0	6	42.86%
4.35.480.0	2	14.29%
4.1.361.21	1	7.14%
3.2.315.0	1	7.14%
4.0.340.3	1	7.14%
4.3.459.0	1	7.14%
4.35.477.8	1	7.14%
3.1.302.0	1	7.14%
Other	0	0.00%
MAILsweeper (3 servers)
Version	Number of Servers	Percent
4.3.17.0	2	66.67%
4.3.20.0	1	33.33%
Other	0	0.00%