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	2,289,478	100.0%
Number of Servers that didn't respond	387,185	16.91%
Server didn't open socket	378,732	16.54%
Server didn't provide banner	8,453	0.37%
Server provided banner	1,902,293	83.09%
Server banner identifies software in use	1,084,295	47.36%

As indicated by the above table, of the 2,289,478 servers queried, only 1,084,295 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	576,002	53.12%
Postfix	328,654	30.31%
Sendmail	83,203	7.67%
Microsoft	32,451	2.99%
MailEnable	29,014	2.68%
MDaemon	17,401	1.60%
IMail	4,102	0.38%
CommuniGate Pro	2,471	0.23%
Lotus Domino	2,335	0.22%
WinWebMail	1,717	0.16%
XMail	1,577	0.15%
Qmail Toaster	1,241	0.11%
Kerio	850	0.08%
SurgeSMTP	821	0.08%
Merak	584	0.05%
ArGoSoft	383	0.04%
MagicMail	259	0.02%
Post.Office	228	0.02%
GroupWise	219	0.02%
Gordano Messaging Suite (GMS)	196	0.02%
OpenSMTPD	160	0.01%
Trend Micro	143	0.01%
InterScan VirusWall	66	0.01%
Mirapoint	59	0.01%
VisNetic	46	0.00%
Mercury	26	0.00%
OpenVMS	18	0.00%
Interscan	15	0.00%
Neon Mail Server	12	0.00%
WebSTAR V	12	0.00%
ModusMail	9	0.00%
NetIQ MailMarshal	7	0.00%
MessageWall	6	0.00%
MAILsweeper	4	0.00%
WebSTAR	4	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (576,002 servers)
Version	Number of Servers	Percent
4.85	236,911	41.13%
4.82	180,968	31.42%
4.84	57,777	10.03%
4.80	20,810	3.61%
4.80.1	20,234	3.51%
4.76	16,886	2.93%
4.72	16,051	2.79%
4.69	7,805	1.36%
Other	18,560	3.22%
Postfix (328,654 servers)
Version	Number of Servers	Percent
Other	328,654	100.00%
Sendmail (83,203 servers)
Version	Number of Servers	Percent
8.13.8	17,859	21.46%
8.14.5	17,775	21.36%
8.14.4	14,303	17.19%
8.13.1	10,438	12.55%
8.14.3	5,843	7.02%
8.12.11.20060308	2,034	2.44%
8.13.6.20060614	1,831	2.20%
8.14.7	1,827	2.20%
8.14.9	1,355	1.63%
8.14.2	1,109	1.33%
8.11.6	963	1.16%
8.12.10	905	1.09%
8.14.1	833	1.00%
Other	6,128	7.37%
Microsoft (32,451 servers)
Version	Number of Servers	Percent
6.0.3790.4675	24,665	76.01%
6.0.3790.3959	2,663	8.21%
7.5.7601.17514	2,085	6.43%
6.0.3790.1830	739	2.28%
7.0.6002.18264	391	1.20%
5.0.2195.7381	341	1.05%
Other	1,567	4.83%
MailEnable (29,014 servers)
Version	Number of Servers	Percent
1.986--	2,265	7.81%
6.5--	2,037	7.02%
8.53--	1,101	3.79%
5.10--	1,101	3.79%
8.51--	1,031	3.55%
8.04--	959	3.31%
4.26--	812	2.80%
6.0--	802	2.76%
8.50--	749	2.58%
8.00--	736	2.54%
7.06--	715	2.46%
8.55--	501	1.73%
7.07--	465	1.60%
7.50--	435	1.50%
1.981--	430	1.48%
7.0--	424	1.46%
6.70--	403	1.39%
6.57--	390	1.34%
7.53--	389	1.34%
8.56--	380	1.31%
8.60-8.60-	325	1.12%
8.60--8.60	315	1.09%
Other	12,249	42.22%
MDaemon (17,401 servers)
Version	Number of Servers	Percent
14.5.3	2,249	12.92%
14.5.2	1,207	6.94%
11.0.3	966	5.55%
11.0.0	864	4.97%
13.5.1	823	4.73%
13.0.4	815	4.68%
13.0.5	731	4.20%
14.0.3	726	4.17%
14.0.2	486	2.79%
10.0.0	432	2.48%
12.5.6	424	2.44%
10.1.2	344	1.98%
12.5.4	309	1.78%
13.6.2	305	1.75%
10.1.1	289	1.66%
14.5.0	283	1.63%
13.6.0	261	1.50%
9.6.1	231	1.33%
14.5.1	231	1.33%
13.5.2	229	1.32%
9.6.6	227	1.30%
9.6.2	213	1.22%
10.1.0	211	1.21%
13.0.2	207	1.19%
13.0.3	207	1.19%
14.0.0	183	1.05%
Other	3,948	22.69%
IMail (4,102 servers)
Version	Number of Servers	Percent
8.22	457	11.14%
12.3.0.100	393	9.58%
12.4.2.27	353	8.61%
12.5.1.60	320	7.80%
9.23	250	6.09%
12.2.0.235	236	5.75%
8.15	208	5.07%
12.4.1.15	193	4.71%
8.05	172	4.19%
11.5	141	3.44%
11.03	120	2.93%
12.5.0.246	107	2.61%
12.4.0.166	83	2.02%
11.01	74	1.80%
7.15	74	1.80%
10.02	70	1.71%
11.02	67	1.63%
12.4.1.9	64	1.56%
6.06	61	1.49%
7.07	60	1.46%
12.5.0.248	54	1.32%
8.00	50	1.22%
12.1.0.270	42	1.02%
Other	453	11.04%
CommuniGate Pro (2,471 servers)
Version	Number of Servers	Percent
5.1.16	239	9.67%
6.0.9	201	8.13%
6.0.11	134	5.42%
6.0.10	120	4.86%
5.4.11	88	3.56%
5.2.20	86	3.48%
6.0.7	84	3.40%
6.0.8	61	2.47%
4.1.8	57	2.31%
5.3.13	55	2.23%
5.3.15	54	2.19%
6.0.5	52	2.10%
5.2.3	49	1.98%
5.0.14	49	1.98%
6.1.1	48	1.94%
5.1.12	39	1.58%
5.2.16	34	1.38%
5.4.4	33	1.34%
4.2.10	32	1.30%
5.4.1	32	1.30%
5.4.6	31	1.25%
5.4.10	30	1.21%
6.0.1	29	1.17%
5.4.8	29	1.17%
5.2.19	28	1.13%
6.1.0	27	1.09%
Other	750	30.35%
Lotus Domino (2,335 servers)
Version	Number of Servers	Percent
8.5.3	361	15.46%
8.5.3FP6	259	11.09%
8.5.2	117	5.01%
8.5.3FP3	99	4.24%
8.5.1	92	3.94%
7.0.2	77	3.30%
8.5.3FP2	75	3.21%
8.5.2FP4	74	3.17%
8.5.2FP2	64	2.74%
8.5	63	2.70%
8.5.3FP5	61	2.61%
8.5.3FP4	60	2.57%
8.5.3FP1	59	2.53%
8.5.2FP3	52	2.23%
7.0.3	48	2.06%
7.0	43	1.84%
8.5.1FP5	39	1.67%
6.5.3	34	1.46%
7.0.1	34	1.46%
8.0.1	34	1.46%
8.0	32	1.37%
8.5.2FP1	31	1.33%
6.5.1	30	1.28%
6.5.4	29	1.24%
8.0.2	29	1.24%
6.5	26	1.11%
Other	413	17.69%
WinWebMail (1,717 servers)
Version	Number of Servers	Percent
3.8.1.3	314	18.29%
3.9.0.7	192	11.18%
3.7.6.1	151	8.79%
3.8.0.1	142	8.27%
3.9.0.1	120	6.99%
3.8.1.5	101	5.88%
3.8.1.1	89	5.18%
3.8.5.1	88	5.13%
3.8.6.1	86	5.01%
3.7.3.1	81	4.72%
3.7.7.3	70	4.08%
3.7.1.1	47	2.74%
3.8.2.1	46	2.68%
3.8.3.1	29	1.69%
3.7.5.1	23	1.34%
3.9.0.5	22	1.28%
3.7.0.3	20	1.16%
3.7.0.5	19	1.11%
Other	77	4.48%
XMail (1,577 servers)
Version	Number of Servers	Percent
1.27	572	36.27%
1.22	455	28.85%
1.25	199	12.62%
1.26	130	8.24%
1.24	76	4.82%
1.21	38	2.41%
1.23	24	1.52%
1.20	18	1.14%
1.17	16	1.01%
Other	49	3.11%
Qmail Toaster (1,241 servers)
Version	Number of Servers	Percent
1.3	1,177	94.84%
1.2	22	1.77%
1.03.5	15	1.21%
Other	27	2.18%
Kerio (850 servers)
Version	Number of Servers	Percent
6.7.3	166	19.53%
6.7.0	88	10.35%
6.6.2	76	8.94%
6.5.0	66	7.76%
6.5.2	61	7.18%
6.7.2	51	6.00%
6.4.1	45	5.29%
6.3.1	41	4.82%
6.6.1	39	4.59%
6.7.1	35	4.12%
6.5.1	25	2.94%
6.3.0	23	2.71%
6.4.0	20	2.35%
6.4.2	16	1.88%
6.6.0	14	1.65%
6.0.10	10	1.18%
6.1.3	10	1.18%
6.2.0	9	1.06%
Other	55	6.47%
SurgeSMTP (821 servers)
Version	Number of Servers	Percent
6.7c-1	170	20.71%
6.5a2-2	135	16.44%
6.5a-1	59	7.19%
6.3c2-2	53	6.46%
6.8g-1	34	4.14%
5.2a-1	32	3.90%
6.4a-1	26	3.17%
5.3h2-2	25	3.05%
3.9e-1	23	2.80%
3.8k4-4	20	2.44%
6.8h-8	15	1.83%
6.1c-1	14	1.71%
6.8h-28	13	1.58%
4.0u4-4	12	1.46%
6.8c-1	10	1.22%
6.0a5-5	9	1.10%
4.2d2-2	9	1.10%
Other	162	19.73%
Merak (584 servers)
Version	Number of Servers	Percent
8.0.3	198	33.90%
8.9.1	75	12.84%
8.5.0	49	8.39%
8.3.8	34	5.82%
7.5.2	31	5.31%
7.4.5	24	4.11%
7.6.4	24	4.11%
7.6.1	13	2.23%
7.0.1	11	1.88%
8.3.15	11	1.88%
7.2.0	10	1.71%
9.0.0	9	1.54%
7.4.2	8	1.37%
8.9.0	8	1.37%
8.2.4	7	1.20%
7.1.6	6	1.03%
6.2.1	6	1.03%
Other	60	10.27%
ArGoSoft (383 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	104	27.15%
1.8 (1.8.9.5)	56	14.62%
1.8 (1.8.9.3)	51	13.32%
1.8 (1.8.9.1)	33	8.62%
1.8 (1.8.8.7)	24	6.27%
1.8 (1.8.8.8)	21	5.48%
1.8 (1.8.9.2)	11	2.87%
1.8 (1.8.9.4)	9	2.35%
1.8 (1.8.6.0)	7	1.83%
1.8 (1.8.7.3)	7	1.83%
1.8 (1.8.8.9)	5	1.31%
1.8 (1.8.8.2)	4	1.04%
Other	51	13.32%
MagicMail (259 servers)
Version	Number of Servers	Percent
Other	259	100.00%
Post.Office (228 servers)
Version	Number of Servers	Percent
4.2.2	40	17.54%
3.5.3	36	15.79%
4.1.2.4	30	13.16%
4.1.0.2	12	5.26%
4.1.1	11	4.82%
4.2.1.3	9	3.95%
4.0.1	8	3.51%
3.9.2.3	6	2.63%
4.2	6	2.63%
4.1.0.3	6	2.63%
4.2.1.1	6	2.63%
3.5.3J	5	2.19%
4.3	5	2.19%
3.1.2	4	1.75%
3.8.7.4	4	1.75%
3.9.1	4	1.75%
3.9.2	3	1.32%
4.1.2.3	3	1.32%
3.9.1.2	3	1.32%
4.1.0.4	3	1.32%
3.5.1	3	1.32%
Other	21	9.21%
GroupWise (219 servers)
Version	Number of Servers	Percent
7.0.3	32	14.61%
14.0.1	23	10.50%
8.0.2	22	10.05%
6.5.7	21	9.59%
8.0.3	18	8.22%
7.0.4	14	6.39%
7.0.2	12	5.48%
14.0.0	10	4.57%
12.0.2	10	4.57%
6.5.6	9	4.11%
6.5.4	8	3.65%
7.0.1	6	2.74%
6.0.4	5	2.28%
14.0.2	4	1.83%
12.0.3	3	1.37%
8.0.0	3	1.37%
6.5.5	3	1.37%
12.0.0	3	1.37%
Other	13	5.94%
Gordano Messaging Suite (GMS) (196 servers)
Version	Number of Servers	Percent
Other	196	100.00%
OpenSMTPD (160 servers)
Version	Number of Servers	Percent
Other	160	100.00%
Trend Micro (143 servers)
Version	Number of Servers	Percent
5.7	55	38.46%
5.5	26	18.18%
5.18	25	17.48%
7.0	13	9.09%
7.1	10	6.99%
8.5	4	2.80%
3.53	3	2.10%
7.5	2	1.40%
Other	5	3.50%
InterScan VirusWall (66 servers)
Version	Number of Servers	Percent
Other	66	100.00%
Mirapoint (59 servers)
Version	Number of Servers	Percent
4.3.5-GA	9	15.25%
4.4.2a-FCS	5	8.47%
4.4.3-GA	5	8.47%
4.3.6-GA	5	8.47%
4.4.5-GA	4	6.78%
4.1.10-GA	4	6.78%
4.4.4-GA	3	5.08%
4.3.3-GA	2	3.39%
3.10.10a-GA	2	3.39%
4.4.5a-GA	2	3.39%
4.4.6-GA	2	3.39%
4.3.7-GA	2	3.39%
4.1.5-GA	2	3.39%
3.8.4-GA	2	3.39%
4.1.3-GA	1	1.69%
3.4.6-GR	1	1.69%
4.1.9-GA	1	1.69%
3.10.4-GA	1	1.69%
4.1.6-GA	1	1.69%
3.7.5a-GA	1	1.69%
4.2.3-GA	1	1.69%
3.8.7a	1	1.69%
3.10.2-GA	1	1.69%
3.8.5-GA	1	1.69%
Other	0	0.00%
VisNetic (46 servers)
Version	Number of Servers	Percent
9.3.2.0	10	21.74%
9.1.4.1	6	13.04%
8.5.0.8	4	8.70%
6.2.2.0	3	6.52%
5.0.2.3	2	4.35%
9.1.4.0	2	4.35%
7.2.4.1	2	4.35%
7.6.1.0	2	4.35%
5.5.8.3	2	4.35%
5.8.6.6	2	4.35%
5.3.5.0	2	4.35%
8.0.3	1	2.17%
8.3.0.1	1	2.17%
8.5.0.5	1	2.17%
5.4.5.4	1	2.17%
8.0.3.1	1	2.17%
5.4.5	1	2.17%
5.0.2.0	1	2.17%
7.2.4.0	1	2.17%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.17%
Other	0	0.00%
Mercury (26 servers)
Version	Number of Servers	Percent
1.48	13	50.00%
3.32	11	42.31%
3.21	1	3.85%
4.x	1	3.85%
Other	0	0.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.3	8	44.44%
7.3	6	33.33%
8.4	4	22.22%
Other	0	0.00%
Interscan (15 servers)
Version	Number of Servers	Percent
3.55 (build 1029)	3	20.00%
3.81-Build_1084	2	13.33%
3.81-Build_1022	2	13.33%
3.5 (build 1294)	1	6.67%
3.8-Build_3013	1	6.67%
3.55 (build 1020)	1	6.67%
3.53 (build 1493)	1	6.67%
3.53 (build 2013)	1	6.67%
3.53 (build 2017)	1	6.67%
3.55 (build 1016)	1	6.67%
3.8-Build_1080	1	6.67%
Other	0	0.00%
Neon Mail Server (12 servers)
Version	Number of Servers	Percent
3.0.7	4	33.33%
3.1.2	2	16.67%
3.1.3	1	8.33%
3.1.0	1	8.33%
3.0.8	1	8.33%
3.1.4	1	8.33%
3.0.6	1	8.33%
3.0.9	1	8.33%
Other	0	0.00%
WebSTAR V (12 servers)
Version	Number of Servers	Percent
5.4.1	6	50.00%
5.4.0	4	33.33%
5.3.3	1	8.33%
5.3.4	1	8.33%
Other	0	0.00%
ModusMail (9 servers)
Version	Number of Servers	Percent
4.35.477.0	6	66.67%
4.1.361.21	1	11.11%
3.2.315.0	1	11.11%
4.35.477.8	1	11.11%
Other	0	0.00%
NetIQ MailMarshal (7 servers)
Version	Number of Servers	Percent
6.0.3.8	3	42.86%
5.5.6.5	2	28.57%
5.5.4.17	1	14.29%
5.5.6.7	1	14.29%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
MAILsweeper (4 servers)
Version	Number of Servers	Percent
4.3.17.0	2	50.00%
4.3.19.0	1	25.00%
4.3.20.0	1	25.00%
Other	0	0.00%
WebSTAR (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%