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	1,990,816	100.0%
Number of Servers that didn't respond	354,341	17.80%
Server didn't open socket	341,581	17.16%
Server didn't provide banner	12,760	0.64%
Server provided banner	1,636,475	82.20%
Server banner identifies software in use	916,143	46.02%

As indicated by the above table, of the 1,990,816 servers queried, only 916,143 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	262,937	28.70%
Microsoft	187,407	20.46%
Sendmail	183,721	20.05%
Postfix	174,937	19.09%
MailEnable	27,496	3.00%
MDaemon	22,590	2.47%
IMail	16,347	1.78%
Kerio	6,853	0.75%
Lotus Domino	5,731	0.63%
WinWebMail	5,149	0.56%
CommuniGate Pro	4,175	0.46%
Merak	3,612	0.39%
XMail	2,581	0.28%
ArGoSoft	1,816	0.20%
GroupWise	1,793	0.20%
Qmail Toaster	1,763	0.19%
SurgeSMTP	1,526	0.17%
Trend Micro	1,496	0.16%
Gordano Messaging Suite (GMS)	767	0.08%
Post.Office	668	0.07%
Mirapoint	465	0.05%
InterScan VirusWall	421	0.05%
VisNetic	405	0.04%
MagicMail	393	0.04%
NetIQ MailMarshal	261	0.03%
Interscan	232	0.03%
Neon Mail Server	131	0.01%
WebSTAR V	120	0.01%
Mercury	114	0.01%
ModusMail	66	0.01%
MessageWall	55	0.01%
WebSTAR	49	0.01%
MAILsweeper	40	0.00%
OpenVMS	26	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (262,937 servers)
Version	Number of Servers	Percent
4.69	213,676	81.27%
4.63	15,320	5.83%
4.67	12,088	4.60%
4.66	4,245	1.61%
4.68	3,876	1.47%
4.60	3,426	1.30%
4.62	2,675	1.02%
Other	7,631	2.90%
Microsoft (187,407 servers)
Version	Number of Servers	Percent
6.0.3790.3959	155,854	83.16%
6.0.3790.1830	18,196	9.71%
5.0.2195.6713	8,934	4.77%
6.0.3790.211	1,913	1.02%
Other	2,510	1.34%
Sendmail (183,721 servers)
Version	Number of Servers	Percent
8.13.1	34,157	18.59%
8.13.8	21,613	11.76%
8.12.11.20060614	17,106	9.31%
8.12.11.20060308	16,287	8.87%
8.14.3	15,905	8.66%
8.13.6	13,441	7.32%
8.13.6.20060614	10,674	5.81%
8.12.10	7,806	4.25%
8.11.6	7,374	4.01%
8.14.1	6,547	3.56%
8.14.2	6,178	3.36%
8.12.11	5,071	2.76%
8.13.4	4,197	2.28%
8.13.7	4,034	2.20%
8.12.8	3,376	1.84%
8.9.3	1,983	1.08%
Other	7,972	4.34%
Postfix (174,937 servers)
Version	Number of Servers	Percent
Other	174,937	100.00%
MailEnable (27,496 servers)
Version	Number of Servers	Percent
1.986--	6,408	23.31%
1.981--	4,350	15.82%
1.983--	2,841	10.33%
3.62--	1,486	5.40%
1.95--	884	3.22%
1.96--	861	3.13%
0-3.61-	715	2.60%
1.9--	708	2.57%
0-3.6-	642	2.33%
1.8--	507	1.84%
0-3.62-	501	1.82%
0-2.53-	441	1.60%
0-2.37-	426	1.55%
0-3.14-	422	1.53%
0-1.87-	407	1.48%
--3.61	393	1.43%
0-1.85-	346	1.26%
--3.6	300	1.09%
Other	4,858	17.67%
MDaemon (22,590 servers)
Version	Number of Servers	Percent
10.1.1	3,064	13.56%
10.0.5	2,039	9.03%
10.0.0	1,330	5.89%
10.1.0	1,249	5.53%
10.0.4	1,166	5.16%
9.6.1	1,158	5.13%
9.6.6	1,113	4.93%
9.6.5	849	3.76%
9.5.2	734	3.25%
10.0.2	692	3.06%
9.6.4	628	2.78%
8.1.3	621	2.75%
9.6.2	610	2.70%
9.5.6	577	2.55%
9.5.1	555	2.46%
9.0.4	527	2.33%
9.6.3	360	1.59%
6.8.5	339	1.50%
7.2.3	339	1.50%
10.0.1	336	1.49%
7.2.0	288	1.27%
9.0.1	286	1.27%
10.0.3	274	1.21%
9.5.5	265	1.17%
Other	3,191	14.13%
IMail (16,347 servers)
Version	Number of Servers	Percent
8.22	3,252	19.89%
10.02	1,667	10.20%
8.15	1,639	10.03%
9.23	1,377	8.42%
11.0	910	5.57%
8.05	878	5.37%
9.10	656	4.01%
7.07	587	3.59%
10.01	587	3.59%
9.20	565	3.46%
9.21	493	3.02%
7.15	426	2.61%
8.00	362	2.21%
6.06	360	2.20%
8.04	297	1.82%
8.21	265	1.62%
10.0	235	1.44%
8.01	199	1.22%
8.10	195	1.19%
9.22	193	1.18%
Other	1,204	7.37%
Kerio (6,853 servers)
Version	Number of Servers	Percent
6.7.0	2,189	31.94%
6.6.2	1,352	19.73%
6.5.2	480	7.00%
6.5.0	392	5.72%
6.4.1	307	4.48%
6.6.0	271	3.95%
6.3.1	266	3.88%
6.5.1	255	3.72%
6.6.1	206	3.01%
6.4.0	176	2.57%
6.4.2	154	2.25%
6.3.0	123	1.79%
6.7.1	86	1.25%
Other	596	8.70%
Lotus Domino (5,731 servers)
Version	Number of Servers	Percent
8.5	738	12.88%
7.0.2	494	8.62%
8.0.2	364	6.35%
7.0.3	330	5.76%
8.0.1	323	5.64%
7.0.1	267	4.66%
6.5.4	256	4.47%
6.5.1	218	3.80%
7.0.3FP1	214	3.73%
6.5.3	199	3.47%
7.0.2FP2	196	3.42%
8.0	163	2.84%
6.5.5	162	2.83%
6.5	155	2.70%
7.0	149	2.60%
8.0.2FP1	90	1.57%
5.0.11	88	1.54%
7.0.2FP1	82	1.43%
6.5.2	79	1.38%
7.0.2FP3	73	1.27%
8.5FP1	60	1.05%
6.5.6	58	1.01%
Other	973	16.98%
WinWebMail (5,149 servers)
Version	Number of Servers	Percent
3.7.6.1	1,093	21.23%
3.7.3.1	862	16.74%
3.7.7.3	789	15.32%
3.8.0.1	665	12.92%
3.7.1.1	475	9.23%
3.7.5.1	286	5.55%
3.6.3.1	248	4.82%
3.7.7.1	207	4.02%
3.7.0.5	202	3.92%
3.7.0.3	142	2.76%
3.7.0.7	140	2.72%
Other	40	0.78%
CommuniGate Pro (4,175 servers)
Version	Number of Servers	Percent
4.1.8	300	7.19%
5.2.14	270	6.47%
5.2.12	205	4.91%
5.2.13	196	4.69%
5.1.13	191	4.57%
5.1.16	184	4.41%
4.2.10	165	3.95%
5.2.8	155	3.71%
5.2.15	151	3.62%
5.1.12	127	3.04%
5.2.10	113	2.71%
5.2.3	106	2.54%
5.2.11	93	2.23%
5.0.14	82	1.96%
5.0.13	82	1.96%
5.1.14	79	1.89%
5.0.9	74	1.77%
5.2.6	69	1.65%
5.2.9	64	1.53%
5.1.9	63	1.51%
5.2.5	63	1.51%
5.2.0	59	1.41%
4.2.8	53	1.27%
4.2	52	1.25%
5.1.7	49	1.17%
4.2.9	48	1.15%
5.1.11	44	1.05%
5.1.8	44	1.05%
5.1.10	43	1.03%
5.2.7	43	1.03%
4.3.12	42	1.01%
Other	866	20.74%
Merak (3,612 servers)
Version	Number of Servers	Percent
8.0.3	1,523	42.17%
8.9.1	341	9.44%
8.5.0	238	6.59%
7.4.5	207	5.73%
8.3.8	157	4.35%
7.6.4	152	4.21%
7.5.2	143	3.96%
7.4.2	63	1.74%
9.0.0	55	1.52%
7.2.0	50	1.38%
8.2.13	49	1.36%
7.6.1	44	1.22%
8.2.4	41	1.14%
6.2.1	40	1.11%
7.0.1	38	1.05%
Other	471	13.04%
XMail (2,581 servers)
Version	Number of Servers	Percent
1.25	754	29.21%
1.22	677	26.23%
1.24	428	16.58%
1.21	177	6.86%
1.26	104	4.03%
1.20	88	3.41%
1.23	87	3.37%
1.17	83	3.22%
1.12	60	2.32%
Other	123	4.77%
ArGoSoft (1,816 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	357	19.66%
1.8 (1.8.9.3)	264	14.54%
1.8 (1.8.9.6)	199	10.96%
1.8 (1.8.9.1)	197	10.85%
1.8 (1.8.8.8)	135	7.43%
1.8 (1.8.8.7)	122	6.72%
1.8 (1.8.9.2)	86	4.74%
1.8 (1.8.9.4)	55	3.03%
1.8 (1.8.8.9)	39	2.15%
1.8 (1.8.8.1)	38	2.09%
1.8 (1.8.6.0)	32	1.76%
1.8 (1.8.9.0)	27	1.49%
1.8 (1.8.8.2)	21	1.16%
Other	244	13.44%
GroupWise (1,793 servers)
Version	Number of Servers	Percent
7.0.3	603	33.63%
7.0.2	252	14.05%
6.5.7	216	12.05%
8.0.0	143	7.98%
7.0.1	120	6.69%
6.5.4	112	6.25%
6.5.6	73	4.07%
6.0.4	65	3.63%
6.5.1	47	2.62%
6.5.5	36	2.01%
7.0	25	1.39%
Other	101	5.63%
Qmail Toaster (1,763 servers)
Version	Number of Servers	Percent
1.3	1,532	86.90%
1.2	172	9.76%
1.0	39	2.21%
Other	20	1.13%
SurgeSMTP (1,526 servers)
Version	Number of Servers	Percent
3.9e-1	379	24.84%
4.0u4-4	236	15.47%
3.9c-1	131	8.58%
3.8k4-4	122	7.99%
4.0u3-3	88	5.77%
3.7b8-8	48	3.15%
3.8i3-3	43	2.82%
3.8f3-3	42	2.75%
3.9g2-2	38	2.49%
3.6f5-5	37	2.42%
3.9h-65	28	1.83%
3.8f2-2	26	1.70%
3.5b3-3	23	1.51%
3.0c2-2	19	1.25%
4.0a-1	16	1.05%
Other	250	16.38%
Trend Micro (1,496 servers)
Version	Number of Servers	Percent
5.7	714	47.73%
5.5	440	29.41%
5.18	224	14.97%
7.0	97	6.48%
Other	21	1.40%
Gordano Messaging Suite (GMS) (767 servers)
Version	Number of Servers	Percent
Other	767	100.00%
Post.Office (668 servers)
Version	Number of Servers	Percent
3.5.3	135	20.21%
4.1.0.2	70	10.48%
4.0.1	60	8.98%
3.5.3J	46	6.89%
3.8.3	32	4.79%
3.6.3	26	3.89%
3.9.2.3	19	2.84%
4.1.0.4	19	2.84%
3.9.1	19	2.84%
3.1.2J	18	2.69%
3.6.2	17	2.54%
3.1.2	16	2.40%
3.9.2	16	2.40%
3.8.7.4	14	2.10%
3.9.0	13	1.95%
4.1.0.3	12	1.80%
4.1	12	1.80%
4.0.0.2	11	1.65%
4.0.0.1	10	1.50%
3.5.2	10	1.50%
3.8.4	10	1.50%
3.9.1.3	8	1.20%
3.9.2.1	8	1.20%
4.0.1.1	7	1.05%
Other	60	8.98%
Mirapoint (465 servers)
Version	Number of Servers	Percent
3.8.4-GA	64	13.76%
3.8.3-GA	58	12.47%
3.10.5-GA	44	9.46%
3.10.4-GA	37	7.96%
3.10.3-GA	28	6.02%
3.8.7a	26	5.59%
3.10.6-GA	20	4.30%
3.8.6-GA	20	4.30%
4.1.3-GA	18	3.87%
3.7.5a-GA	18	3.87%
3.8.2-GA	18	3.87%
4.1.5-GA	14	3.01%
4.1.4-GA	13	2.80%
3.7.3a-GA	12	2.58%
3.8.5-GA	11	2.37%
4.0.5a	10	2.15%
3.10.2-GA	10	2.15%
3.10.7-GA	7	1.51%
3.7.4b-GA	6	1.29%
4.1.6-GA	5	1.08%
Other	26	5.59%
InterScan VirusWall (421 servers)
Version	Number of Servers	Percent
Other	421	100.00%
VisNetic (405 servers)
Version	Number of Servers	Percent
9.3.2.0	145	35.80%
9.1.4.1	48	11.85%
5.8.6.6	20	4.94%
5.0.2.3	16	3.95%
8.5.0.8	14	3.46%
6.2.2.0	14	3.46%
5.5.8.3	14	3.46%
8.0.3.1	11	2.72%
8.0.3.0	11	2.72%
8.3.6	10	2.47%
9.1.4.0	10	2.47%
7.2.4.1	10	2.47%
5.3.5.0	9	2.22%
8.3.5.0	8	1.98%
8.0.3	8	1.98%
5.4.5.4	8	1.98%
7.6.1.0	8	1.98%
5.8.6.4	5	1.23%
Other	36	8.89%
MagicMail (393 servers)
Version	Number of Servers	Percent
Other	393	100.00%
NetIQ MailMarshal (261 servers)
Version	Number of Servers	Percent
6.0.3.8	205	78.54%
6.1.3.15	17	6.51%
5.5.6.7	16	6.13%
5.5.4.16	5	1.92%
5.5.6.5	4	1.53%
5.5.6.6	3	1.15%
Other	11	4.21%
Interscan (232 servers)
Version	Number of Servers	Percent
3.8-Build_3013	50	21.55%
3.55 (build 1016)	39	16.81%
3.81-Build_1022	27	11.64%
3.55 (build 1029)	23	9.91%
3.53 (build 2017)	21	9.05%
3.81-Build_1084	12	5.17%
3.53 (build 1493)	10	4.31%
3.53 (build 2011)	9	3.88%
3.53 (build 2013)	7	3.02%
3.52 (build 1375)	5	2.16%
3.55 (build 1020)	5	2.16%
3.51 (build 1337)	3	1.29%
Other	21	9.05%
Neon Mail Server (131 servers)
Version	Number of Servers	Percent
3.1.3	31	23.66%
3.0.7	24	18.32%
3.0.9	19	14.50%
3.1.5	16	12.21%
3.1.4	15	11.45%
3.1.2	12	9.16%
3.1.0	7	5.34%
3.1.1	2	1.53%
3.0.8	2	1.53%
3.0.6	2	1.53%
Other	1	0.76%
WebSTAR V (120 servers)
Version	Number of Servers	Percent
5.4.1	42	35.00%
5.4.0	31	25.83%
5.3.4	26	21.67%
5.3.2	11	9.17%
5.3.3	7	5.83%
5.3.1	2	1.67%
Other	1	0.83%
Mercury (114 servers)
Version	Number of Servers	Percent
1.48	56	49.12%
3.32	33	28.95%
3.21c	10	8.77%
1.47	5	4.39%
3.21	2	1.75%
3.31	2	1.75%
1.49	2	1.75%
Other	4	3.51%
ModusMail (66 servers)
Version	Number of Servers	Percent
3.2.315.0	17	25.76%
4.35.480.0	10	15.15%
4.35.477.0	10	15.15%
3.1.302.0	6	9.09%
4.2.420.0	5	7.58%
4.35.480.11	4	6.06%
4.3.459.0	4	6.06%
4.1.361.21	3	4.55%
3.1.293.1	2	3.03%
4.2.425.22	1	1.52%
4.1.361.0	1	1.52%
4.2.425.4	1	1.52%
4.0.340.3	1	1.52%
4.35.477.8	1	1.52%
Other	0	0.00%
MessageWall (55 servers)
Version	Number of Servers	Percent
1.0.8	38	69.09%
1.0.11	14	25.45%
1.1.0	2	3.64%
1.0.6	1	1.82%
Other	0	0.00%
WebSTAR (49 servers)
Version	Number of Servers	Percent
Other	49	100.00%
MAILsweeper (40 servers)
Version	Number of Servers	Percent
4.3.20.0	13	32.50%
4.3.14.0	5	12.50%
4.3.17.0	5	12.50%
4.2.10.0	4	10.00%
4.3.1.0	4	10.00%
4.3.19.0	2	5.00%
4.3.10.0	2	5.00%
4.3.6.0	2	5.00%
4.2.1.0	1	2.50%
4.3.12.0	1	2.50%
4.2.5.0	1	2.50%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	15	57.69%
7.3	6	23.08%
8.2	2	7.69%
7.2	2	7.69%
6.1	1	3.85%
Other	0	0.00%