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	2,465,146	100.0%
Number of Servers that didn't respond	435,451	17.66%
Server didn't open socket	423,915	17.20%
Server didn't provide banner	11,536	0.47%
Server provided banner	2,029,695	82.34%
Server banner identifies software in use	1,117,734	45.34%

As indicated by the above table, of the 2,465,146 servers queried, only 1,117,734 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	545,794	48.83%
Postfix	298,322	26.69%
Sendmail	112,880	10.10%
Microsoft	80,070	7.16%
MailEnable	33,108	2.96%
MDaemon	20,600	1.84%
IMail	6,585	0.59%
Lotus Domino	4,272	0.38%
CommuniGate Pro	3,073	0.27%
WinWebMail	3,037	0.27%
XMail	2,084	0.19%
Qmail Toaster	1,569	0.14%
Kerio	1,366	0.12%
Merak	1,093	0.10%
SurgeSMTP	1,009	0.09%
ArGoSoft	639	0.06%
GroupWise	411	0.04%
Post.Office	342	0.03%
MagicMail	307	0.03%
Gordano Messaging Suite (GMS)	296	0.03%
Trend Micro	278	0.02%
Mirapoint	118	0.01%
VisNetic	113	0.01%
InterScan VirusWall	112	0.01%
Mercury	47	0.00%
Interscan	38	0.00%
OpenSMTPD	38	0.00%
NetIQ MailMarshal	24	0.00%
WebSTAR V	24	0.00%
Neon Mail Server	20	0.00%
OpenVMS	19	0.00%
MessageWall	18	0.00%
WebSTAR	13	0.00%
ModusMail	11	0.00%
MAILsweeper	4	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (545,794 servers)
Version	Number of Servers	Percent
4.80	411,948	75.48%
4.80.1	37,628	6.89%
4.72	22,735	4.17%
4.69	19,844	3.64%
4.76	15,655	2.87%
4.77	15,385	2.82%
Other	22,599	4.14%
Postfix (298,322 servers)
Version	Number of Servers	Percent
Other	298,322	100.00%
Sendmail (112,880 servers)
Version	Number of Servers	Percent
8.13.8	29,678	26.29%
8.13.1	15,961	14.14%
8.14.3	15,327	13.58%
8.14.5	13,482	11.94%
8.14.4	13,269	11.75%
8.12.11.20060308	4,089	3.62%
8.13.6.20060614	3,237	2.87%
8.14.2	2,889	2.56%
8.11.6	1,864	1.65%
8.12.10	1,676	1.48%
8.14.1	1,580	1.40%
8.13.6	1,312	1.16%
8.13.7	1,214	1.08%
Other	7,302	6.47%
Microsoft (80,070 servers)
Version	Number of Servers	Percent
6.0.3790.4675	64,742	80.86%
6.0.3790.3959	7,918	9.89%
6.0.3790.1830	2,129	2.66%
7.5.7601.17514	2,022	2.53%
5.0.2195.7381	807	1.01%
Other	2,452	3.06%
MailEnable (33,108 servers)
Version	Number of Servers	Percent
1.986--	5,443	16.44%
5.10--	2,316	7.00%
6.5--	2,083	6.29%
4.26--	1,764	5.33%
6.0--	1,356	4.10%
1.981--	1,005	3.04%
7.06--	594	1.79%
6.70--	560	1.69%
3.62--	555	1.68%
1.983--	547	1.65%
6.57--	535	1.62%
5.51--	505	1.53%
7.0--	486	1.47%
6.03--	480	1.45%
0-6.83-	477	1.44%
6.60--	423	1.28%
5.11--	366	1.11%
0-3.65-	364	1.10%
0-3.63-	332	1.00%
Other	12,917	39.01%
MDaemon (20,600 servers)
Version	Number of Servers	Percent
13.0.5	3,159	15.33%
13.0.4	1,885	9.15%
11.0.3	1,616	7.84%
13.0.3	1,267	6.15%
11.0.0	1,218	5.91%
10.0.0	733	3.56%
12.5.6	686	3.33%
13.0.2	606	2.94%
10.1.2	600	2.91%
10.1.1	578	2.81%
9.6.1	438	2.13%
9.6.6	396	1.92%
12.5.4	376	1.83%
10.1.0	371	1.80%
9.6.2	286	1.39%
12.5.8	276	1.34%
9.5.2	272	1.32%
12.0.3	257	1.25%
9.6.5	229	1.11%
10.0.2	228	1.11%
10.0.5	223	1.08%
12.5.3	223	1.08%
9.5.1	220	1.07%
9.5.6	212	1.03%
Other	4,245	20.61%
IMail (6,585 servers)
Version	Number of Servers	Percent
8.22	1,115	16.93%
12.2.0.235	819	12.44%
11.5	507	7.70%
12.3.0.100	451	6.85%
9.23	391	5.94%
8.15	382	5.80%
11.03	347	5.27%
8.05	255	3.87%
12.2.0.169	234	3.55%
10.02	212	3.22%
12.1.0.270	195	2.96%
11.01	148	2.25%
7.07	143	2.17%
6.06	120	1.82%
7.15	119	1.81%
8.00	108	1.64%
10.01	97	1.47%
11.0	91	1.38%
11.02	86	1.31%
9.21	66	1.00%
Other	699	10.62%
Lotus Domino (4,272 servers)
Version	Number of Servers	Percent
8.5.3	734	17.18%
8.5.3FP3	324	7.58%
8.5.3FP2	239	5.59%
8.5.2	234	5.48%
8.5.3FP1	183	4.28%
8.5.2FP2	181	4.24%
8.5.1	176	4.12%
7.0.2	163	3.82%
8.5	140	3.28%
8.5.2FP3	128	3.00%
8.5.3FP4	127	2.97%
8.5.2FP4	99	2.32%
7.0.3	92	2.15%
8.5.1FP5	78	1.83%
8.0.2	71	1.66%
7.0	70	1.64%
8.0.1	70	1.64%
8.5.2FP1	68	1.59%
7.0.1	68	1.59%
6.5.1	66	1.54%
6.5.4	62	1.45%
6.5.3	61	1.43%
6.5.5	53	1.24%
8.0	47	1.10%
6.5	47	1.10%
Other	691	16.18%
CommuniGate Pro (3,073 servers)
Version	Number of Servers	Percent
5.1.16	286	9.31%
6.0.5	125	4.07%
4.1.8	113	3.68%
5.2.20	104	3.38%
6.0.4	100	3.25%
6.0.1	87	2.83%
5.4.8	85	2.77%
5.4.4	84	2.73%
5.3.13	80	2.60%
5.4.6	79	2.57%
5.3.15	76	2.47%
4.2.10	72	2.34%
5.4.10	64	2.08%
5.4.1	61	1.99%
5.1.12	58	1.89%
5.2.19	57	1.85%
5.4.5	57	1.85%
5.0.14	55	1.79%
5.2.3	54	1.76%
5.2.16	53	1.72%
5.4.7	50	1.63%
5.4.2	45	1.46%
5.4.3	43	1.40%
5.4.9	42	1.37%
5.2.14	38	1.24%
5.4.0	37	1.20%
5.2.12	32	1.04%
Other	1,036	33.71%
WinWebMail (3,037 servers)
Version	Number of Servers	Percent
3.8.1.3	590	19.43%
3.8.0.1	361	11.89%
3.7.6.1	299	9.85%
3.8.1.5	258	8.50%
3.8.1.1	205	6.75%
3.7.3.1	199	6.55%
3.8.5.1	194	6.39%
3.7.7.3	182	5.99%
3.8.2.1	177	5.83%
3.7.1.1	103	3.39%
3.8.3.1	95	3.13%
3.7.5.1	78	2.57%
3.8.3.3	75	2.47%
3.6.3.1	44	1.45%
3.7.0.3	43	1.42%
3.7.0.5	38	1.25%
3.7.7.1	37	1.22%
3.7.0.7	31	1.02%
Other	28	0.92%
XMail (2,084 servers)
Version	Number of Servers	Percent
1.27	633	30.37%
1.22	516	24.76%
1.25	317	15.21%
1.26	219	10.51%
1.24	143	6.86%
1.21	68	3.26%
1.23	43	2.06%
1.20	32	1.54%
1.17	31	1.49%
Other	82	3.93%
Qmail Toaster (1,569 servers)
Version	Number of Servers	Percent
1.3	1,488	94.84%
1.2	44	2.80%
Other	37	2.36%
Kerio (1,366 servers)
Version	Number of Servers	Percent
6.7.3	227	16.62%
6.6.2	136	9.96%
6.7.0	132	9.66%
6.5.0	106	7.76%
6.5.2	98	7.17%
6.7.2	82	6.00%
6.4.1	75	5.49%
6.7.1	70	5.12%
6.3.1	55	4.03%
6.4.0	50	3.66%
6.6.1	49	3.59%
6.5.1	46	3.37%
6.6.0	45	3.29%
6.3.0	28	2.05%
6.4.2	27	1.98%
6.0.10	18	1.32%
Other	122	8.93%
Merak (1,093 servers)
Version	Number of Servers	Percent
8.0.3	431	39.43%
8.9.1	129	11.80%
8.5.0	66	6.04%
8.3.8	52	4.76%
7.5.2	49	4.48%
7.4.5	44	4.03%
7.6.4	42	3.84%
7.0.1	24	2.20%
7.4.2	19	1.74%
7.6.1	19	1.74%
9.0.0	18	1.65%
7.2.0	16	1.46%
8.9.0	12	1.10%
6.2.1	12	1.10%
8.3.15	12	1.10%
8.2.4	11	1.01%
Other	137	12.53%
SurgeSMTP (1,009 servers)
Version	Number of Servers	Percent
6.3c2-2	330	32.71%
5.3h2-2	75	7.43%
6.1c-1	73	7.23%
5.2a-1	67	6.64%
3.9e-1	43	4.26%
6.0a5-5	29	2.87%
3.8k4-4	23	2.28%
4.0u4-4	23	2.28%
6.0a4-4	21	2.08%
4.2d2-2	18	1.78%
6.4a-1	16	1.59%
5.0e4-4	15	1.49%
4.3g2-2	14	1.39%
3.8i3-3	13	1.29%
4.2d4-4	11	1.09%
6.3d-72	11	1.09%
Other	227	22.50%
ArGoSoft (639 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	164	25.67%
1.8 (1.8.9.5)	87	13.62%
1.8 (1.8.9.3)	81	12.68%
1.8 (1.8.9.1)	72	11.27%
1.8 (1.8.8.7)	44	6.89%
1.8 (1.8.8.8)	37	5.79%
1.8 (1.8.9.2)	23	3.60%
1.8 (1.8.9.4)	18	2.82%
1.8 (1.8.8.9)	12	1.88%
1.8 (1.8.6.0)	10	1.56%
1.8 (1.8.7.3)	7	1.10%
Other	84	13.15%
GroupWise (411 servers)
Version	Number of Servers	Percent
7.0.3	74	18.00%
8.0.2	62	15.09%
6.5.7	46	11.19%
7.0.4	33	8.03%
7.0.2	24	5.84%
6.5.4	20	4.87%
8.0.3	20	4.87%
6.5.6	18	4.38%
6.0.4	14	3.41%
7.0.1	13	3.16%
8.0.1	12	2.92%
6.5.1	10	2.43%
12.0.2	10	2.43%
8.0.0	9	2.19%
12.0.1	9	2.19%
12.0.0	7	1.70%
7.0	7	1.70%
6.5.5	6	1.46%
Other	17	4.14%
Post.Office (342 servers)
Version	Number of Servers	Percent
3.5.3	42	12.28%
4.1.2.4	34	9.94%
4.1.0.2	29	8.48%
4.0.1	19	5.56%
4.1.1	18	5.26%
3.9.2.3	12	3.51%
4.2	12	3.51%
3.5.3J	10	2.92%
4.1.0.3	10	2.92%
3.8.3	10	2.92%
3.1.2J	9	2.63%
3.1.2	8	2.34%
3.9.2	8	2.34%
4.2.2	8	2.34%
4.1.0.4	8	2.34%
3.6.2	7	2.05%
4.1.2.3	6	1.75%
3.9.1	6	1.75%
3.9.1.2	5	1.46%
4.0.1.1	5	1.46%
4.2.1.3	5	1.46%
4.1.2.2	5	1.46%
3.8.7.4	5	1.46%
3.5.4	4	1.17%
4.1	4	1.17%
3.9.1.3	4	1.17%
4.0.0.1	4	1.17%
3.9.2.2	4	1.17%
3.5.1	4	1.17%
4.2.1.1	4	1.17%
Other	33	9.65%
MagicMail (307 servers)
Version	Number of Servers	Percent
Other	307	100.00%
Gordano Messaging Suite (GMS) (296 servers)
Version	Number of Servers	Percent
Other	296	100.00%
Trend Micro (278 servers)
Version	Number of Servers	Percent
5.7	104	37.41%
5.5	65	23.38%
5.18	45	16.19%
7.0	30	10.79%
7.1	22	7.91%
3.53	3	1.08%
Other	9	3.24%
Mirapoint (118 servers)
Version	Number of Servers	Percent
4.3.5-GA	18	15.25%
3.10.10a-GA	12	10.17%
4.2.3-GA	10	8.47%
4.3.6-GA	9	7.63%
4.1.10-GA	8	6.78%
3.10.9-GA	7	5.93%
4.1.9-GA	6	5.08%
4.4.2a-FCS	4	3.39%
3.10.8-GA	4	3.39%
4.1.3-GA	3	2.54%
3.10.4-GA	3	2.54%
3.7.5a-GA	3	2.54%
4.3.3-GA	3	2.54%
4.2.4-GA	3	2.54%
3.8.5-GA	3	2.54%
4.1.8-GA	3	2.54%
4.1.5-GA	3	2.54%
3.8.4-GA	2	1.69%
3.10.3-GA	2	1.69%
3.10.2-GA	2	1.69%
3.8.3-GA	2	1.69%
4.0.5a	2	1.69%
Other	6	5.08%
VisNetic (113 servers)
Version	Number of Servers	Percent
9.3.2.0	32	28.32%
9.1.4.1	12	10.62%
8.0.3.1	7	6.19%
5.5.8.3	6	5.31%
7.6.1.0	5	4.42%
6.2.2.0	5	4.42%
5.8.6.6	4	3.54%
7.2.4.1	4	3.54%
8.0.3	4	3.54%
8.0.3.0	4	3.54%
5.0.2.3	4	3.54%
8.5.0.8	4	3.54%
9.1.4.0	3	2.65%
5.4.5.4	3	2.65%
5.8.6.4	2	1.77%
5.3.5.0	2	1.77%
Other	12	10.62%
InterScan VirusWall (112 servers)
Version	Number of Servers	Percent
Other	112	100.00%
Mercury (47 servers)
Version	Number of Servers	Percent
1.48	27	57.45%
3.32	12	25.53%
1.47	2	4.26%
3.21c	2	4.26%
3.21	1	2.13%
1.44	1	2.13%
4.x	1	2.13%
3.30	1	2.13%
Other	0	0.00%
Interscan (38 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	7	18.42%
3.81-Build_1022	6	15.79%
3.55 (build 1029)	5	13.16%
3.53 (build 2011)	4	10.53%
3.81-Build_1084	3	7.89%
3.53 (build 1493)	3	7.89%
3.8-Build_3013	2	5.26%
3.53 (build 2017)	2	5.26%
3.5 (build 1294)	1	2.63%
3.81-Build_1055	1	2.63%
3.51 (build 1337)	1	2.63%
3.53 (build 2013)	1	2.63%
3.8-Build_3045	1	2.63%
3.8-Build_1080	1	2.63%
Other	0	0.00%
OpenSMTPD (38 servers)
Version	Number of Servers	Percent
Other	38	100.00%
NetIQ MailMarshal (24 servers)
Version	Number of Servers	Percent
6.0.3.8	15	62.50%
5.5.6.7	3	12.50%
5.5.6.5	2	8.33%
5.5.6.6	2	8.33%
5.5.5.6	1	4.17%
5.5.4.17	1	4.17%
Other	0	0.00%
WebSTAR V (24 servers)
Version	Number of Servers	Percent
5.4.1	14	58.33%
5.4.0	5	20.83%
5.3.4	3	12.50%
5.3.3	1	4.17%
5.3.2	1	4.17%
Other	0	0.00%
Neon Mail Server (20 servers)
Version	Number of Servers	Percent
3.0.7	6	30.00%
3.1.4	3	15.00%
3.1.2	3	15.00%
3.1.3	3	15.00%
3.0.9	2	10.00%
3.1.0	2	10.00%
3.0.6	1	5.00%
Other	0	0.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	8	42.11%
8.4	6	31.58%
7.3	4	21.05%
8.2	1	5.26%
Other	0	0.00%
MessageWall (18 servers)
Version	Number of Servers	Percent
1.0.8	17	94.44%
1.0.6	1	5.56%
Other	0	0.00%
WebSTAR (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
ModusMail (11 servers)
Version	Number of Servers	Percent
4.35.477.0	6	54.55%
4.1.361.21	1	9.09%
3.2.315.0	1	9.09%
4.0.340.3	1	9.09%
4.35.477.8	1	9.09%
3.1.302.0	1	9.09%
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%