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	1,848,985	100.0%
Number of Servers that didn't respond	321,703	17.40%
Server didn't open socket	312,519	16.90%
Server didn't provide banner	9,184	0.50%
Server provided banner	1,527,282	82.60%
Server banner identifies software in use	948,347	51.29%

As indicated by the above table, of the 1,848,985 servers queried, only 948,347 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	540,333	56.98%
Postfix	322,885	34.05%
Sendmail	40,132	4.23%
MailEnable	20,900	2.20%
MDaemon	9,332	0.98%
Microsoft	6,630	0.70%
IMail	1,730	0.18%
CommuniGate Pro	1,508	0.16%
XMail	915	0.10%
Lotus Domino	695	0.07%
WinWebMail	690	0.07%
SurgeSMTP	533	0.06%
Qmail Toaster	430	0.05%
OpenSMTPD	344	0.04%
Kerio	338	0.04%
Merak	222	0.02%
MagicMail	161	0.02%
ArGoSoft	155	0.02%
Post.Office	132	0.01%
GroupWise	77	0.01%
Gordano Messaging Suite (GMS)	64	0.01%
Trend Micro	54	0.01%
InterScan VirusWall	23	0.00%
VisNetic	16	0.00%
OpenVMS	12	0.00%
Mirapoint	8	0.00%
Mercury	7	0.00%
Interscan	6	0.00%
Neon Mail Server	5	0.00%
WebSTAR V	4	0.00%
MessageWall	3	0.00%
WebSTAR	2	0.00%
ModusMail	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (540,333 servers)
Version	Number of Servers	Percent
4.91	354,352	65.58%
4.89	77,765	14.39%
4.87	36,130	6.69%
4.90	14,912	2.76%
4.84	14,293	2.65%
4.80	6,052	1.12%
4.86	5,716	1.06%
Other	31,113	5.76%
Postfix (322,885 servers)
Version	Number of Servers	Percent
Other	322,885	100.00%
Sendmail (40,132 servers)
Version	Number of Servers	Percent
8.15.2	11,383	28.36%
8.14.4	8,680	21.63%
8.13.8	5,446	13.57%
8.13.1	3,450	8.60%
8.14.5	3,386	8.44%
8.14.7	2,176	5.42%
8.14.9	1,679	4.18%
8.14.3	1,028	2.56%
Other	2,904	7.24%
MailEnable (20,900 servers)
Version	Number of Servers	Percent
9.00--	2,400	11.48%
9.16--	2,108	10.09%
10.12--	1,404	6.72%
8.60--	751	3.59%
8.53--	734	3.51%
6.5--	582	2.78%
8.51--	507	2.43%
10.16--	374	1.79%
8.60-8.60-	363	1.74%
8.04--	354	1.69%
1.986--	340	1.63%
9.75--	317	1.52%
10.14--	265	1.27%
10.15--	252	1.21%
8.50--	233	1.11%
9.00--9.00	214	1.02%
Other	9,702	46.42%
MDaemon (9,332 servers)
Version	Number of Servers	Percent
18.0.2	702	7.52%
13.5.1	521	5.58%
13.6.3	443	4.75%
16.5.2	424	4.54%
13.0.4	383	4.10%
11.0.3	371	3.98%
13.0.5	369	3.95%
11.0.0	368	3.94%
18.0.1	300	3.21%
17.5.2	265	2.84%
17.5.3	219	2.35%
12.5.4	207	2.22%
12.5.6	200	2.14%
16.0.4	190	2.04%
14.5.2	176	1.89%
18.0.0	173	1.85%
15.0.3	167	1.79%
10.0.0	143	1.53%
10.1.2	139	1.49%
16.5.1	138	1.48%
17.5.1	136	1.46%
17.0.2	127	1.36%
16.0.1	108	1.16%
13.0.2	105	1.13%
10.1.0	97	1.04%
Other	2,861	30.66%
Microsoft (6,630 servers)
Version	Number of Servers	Percent
6.0.3790.4675	3,531	53.26%
7.5.7601.17514	889	13.41%
8.5.9600.16384	720	10.86%
6.0.3790.3959	417	6.29%
8.0.9200.16384	174	2.62%
10.0.14393.0	151	2.28%
5.0.2195.5329	146	2.20%
7.0.6002.18264	117	1.76%
6.0.3790.1830	106	1.60%
5.0.2195.6713	72	1.09%
Other	307	4.63%
IMail (1,730 servers)
Version	Number of Servers	Percent
12.5.6.101	276	15.95%
8.22	180	10.40%
12.4.1.15	157	9.08%
12.5.5.115	134	7.75%
9.23	117	6.76%
12.5.3.93	95	5.49%
12.3.0.100	88	5.09%
12.5.4.146	87	5.03%
8.15	79	4.57%
8.05	53	3.06%
11.03	52	3.01%
11.5	32	1.85%
12.5.5.117	26	1.50%
7.07	25	1.45%
7.15	21	1.21%
10.02	20	1.16%
10.01	19	1.10%
Other	269	15.55%
CommuniGate Pro (1,508 servers)
Version	Number of Servers	Percent
6.1.16.	56	3.71%
6.1.18	38	2.52%
6.1.16	37	2.45%
5.3.13.	34	2.25%
6.1.11	32	2.12%
6.0.11.	32	2.12%
6.1.18.	30	1.99%
6.2.5.	30	1.99%
6.2.1	30	1.99%
5.4.11	29	1.92%
5.4.11.	27	1.79%
6.1.19	25	1.66%
6.0.11	24	1.59%
6.2.4	22	1.46%
5.2.20.	21	1.39%
6.1.19.	21	1.39%
5.2.20	21	1.39%
6.1.11.	21	1.39%
6.1.10	20	1.33%
5.1.16	19	1.26%
6.0.9	19	1.26%
6.2.0	19	1.26%
5.2.3	18	1.19%
5.1.16.	17	1.13%
6.2.3.	17	1.13%
6.2.4.	16	1.06%
6.1.2.	16	1.06%
6.0.9.	16	1.06%
6.2.2	16	1.06%
Other	785	52.06%
XMail (915 servers)
Version	Number of Servers	Percent
1.27	414	45.25%
1.22	293	32.02%
1.25	63	6.89%
1.26	57	6.23%
1.24	34	3.72%
1.21	17	1.86%
1.23	11	1.20%
Other	26	2.84%
Lotus Domino (695 servers)
Version	Number of Servers	Percent
8.5.3FP6	136	19.57%
8.5.3	102	14.68%
8.5.2	32	4.60%
7.0.2	28	4.03%
8.5.1	24	3.45%
8.5	24	3.45%
8.5.3FP2	19	2.73%
8.5.3FP3	18	2.59%
8.5.2FP4	15	2.16%
8.5.2FP3	14	2.01%
8.0.1	14	2.01%
8.5.3FP1	14	2.01%
7.0.3	13	1.87%
8.5.3FP4	13	1.87%
8.5.2FP2	12	1.73%
7.0	11	1.58%
8.0	11	1.58%
6.5	10	1.44%
7.0.1	10	1.44%
6.5.5	9	1.29%
6.5.1	9	1.29%
6.5.4	8	1.15%
8.5.3FP5	8	1.15%
8.5.1FP5	8	1.15%
8.0.2	8	1.15%
7.0.4	7	1.01%
7.0.3FP1	7	1.01%
Other	111	15.97%
WinWebMail (690 servers)
Version	Number of Servers	Percent
3.9.0.7	150	21.74%
3.8.1.3	90	13.04%
3.9.0.1	51	7.39%
3.8.0.1	41	5.94%
4.0.0.1	35	5.07%
3.7.6.1	33	4.78%
4.1.0.1	31	4.49%
3.8.1.5	29	4.20%
3.8.5.1	20	2.90%
3.9.5.3	18	2.61%
3.7.3.1	17	2.46%
4.2.0.1	16	2.32%
3.8.6.1	16	2.32%
3.8.1.1	16	2.32%
3.7.7.3	15	2.17%
3.9.2.1	14	2.03%
3.9.3.1	13	1.88%
3.8.2.1	12	1.74%
3.8.3.1	11	1.59%
3.7.1.1	10	1.45%
3.9.5.1	10	1.45%
3.7.5.1	7	1.01%
Other	35	5.07%
SurgeSMTP (533 servers)
Version	Number of Servers	Percent
7.3e2-2	183	34.33%
7.1e-1	42	7.88%
6.5a2-2	33	6.19%
7.2i-1	25	4.69%
6.7c-1	23	4.32%
7.2a-1	21	3.94%
7.3i2-2	17	3.19%
7.2e-2	14	2.63%
7.0c2-2	14	2.63%
6.9c-1	13	2.44%
7.3c3-3	12	2.25%
3.9e-1	12	2.25%
6.5a-1	12	2.25%
5.2a-1	10	1.88%
7.3h-6	9	1.69%
6.1c-1	8	1.50%
6.4a-1	8	1.50%
4.0u4-4	7	1.31%
7.3j-4	6	1.13%
Other	64	12.01%
Qmail Toaster (430 servers)
Version	Number of Servers	Percent
1.3	314	73.02%
1.03	93	21.63%
1.2	8	1.86%
1.03.5	7	1.63%
1.03.6	5	1.16%
Other	3	0.70%
OpenSMTPD (344 servers)
Version	Number of Servers	Percent
Other	344	100.00%
Kerio (338 servers)
Version	Number of Servers	Percent
6.7.3	64	18.93%
6.7.0	48	14.20%
6.5.2	35	10.36%
6.6.2	34	10.06%
6.7.2	29	8.58%
6.6.1	17	5.03%
6.4.1	16	4.73%
6.5.0	16	4.73%
6.7.1	12	3.55%
6.3.1	11	3.25%
6.4.0	9	2.66%
6.5.1	7	2.07%
6.3.0	6	1.78%
6.6.0	5	1.48%
6.1.3	4	1.18%
5.7.9	4	1.18%
Other	21	6.21%
Merak (222 servers)
Version	Number of Servers	Percent
8.0.3	68	30.63%
8.9.1	42	18.92%
8.5.0	15	6.76%
7.6.1	11	4.95%
7.4.5	11	4.95%
7.5.2	10	4.50%
8.3.8	10	4.50%
7.6.4	6	2.70%
9.0.3	6	2.70%
7.4.2	4	1.80%
7.2.0	4	1.80%
4.2.1	3	1.35%
7.6.0	3	1.35%
7.0.1	3	1.35%
6.0.8	3	1.35%
Other	23	10.36%
MagicMail (161 servers)
Version	Number of Servers	Percent
Other	161	100.00%
ArGoSoft (155 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	57	36.77%
1.8 (1.8.9.5)	20	12.90%
1.8 (1.8.9.3)	19	12.26%
1.8 (1.8.9.1)	16	10.32%
1.8 (1.8.7.3)	5	3.23%
1.8 (1.8.8.8)	5	3.23%
1.8 (1.8.8.9)	4	2.58%
1.8 (1.8.9.2)	3	1.94%
1.8 (1.8.8.7)	3	1.94%
1.8 (1.8.9.4)	3	1.94%
1.8 (1.8.6.0)	3	1.94%
1.8 (1.8.7.6)	2	1.29%
1.8 (1.8.8.4)	2	1.29%
1.8 (1.8.5.8)	2	1.29%
1.8 (1.8.2.1)	2	1.29%
Other	9	5.81%
Post.Office (132 servers)
Version	Number of Servers	Percent
4.3	31	23.48%
4.2.2	25	18.94%
4.1.2.4	13	9.85%
3.5.3	12	9.09%
4.2.1.3	9	6.82%
4.4	8	6.06%
3.9.2.3	3	2.27%
4.1.1	3	2.27%
4.2.1.1	3	2.27%
3.5.1	3	2.27%
3.5.3J	3	2.27%
3.1.2	3	2.27%
3.9.2	2	1.52%
3.8.7.4	2	1.52%
Other	12	9.09%
GroupWise (77 servers)
Version	Number of Servers	Percent
14.2.2	16	20.78%
18.0.1	9	11.69%
14.2.0	7	9.09%
14.2.1	6	7.79%
6.5.7	5	6.49%
14.2.3	5	6.49%
18.0.0	5	6.49%
7.0.3	4	5.19%
14.0.1	4	5.19%
8.0.3	2	2.60%
6.0.2	2	2.60%
6.0.4	2	2.60%
7.0.2	1	1.30%
6.5.0	1	1.30%
6.0.3	1	1.30%
6.5.5	1	1.30%
12.0.1	1	1.30%
7.0.1	1	1.30%
6.5.2	1	1.30%
14.0.0	1	1.30%
14.0.2	1	1.30%
7.0.4	1	1.30%
Other	0	0.00%
Gordano Messaging Suite (GMS) (64 servers)
Version	Number of Servers	Percent
Other	64	100.00%
Trend Micro (54 servers)
Version	Number of Servers	Percent
5.7	18	33.33%
5.18	11	20.37%
5.5	8	14.81%
7.0	7	12.96%
7.5	5	9.26%
3.53	2	3.70%
8.5	1	1.85%
8	1	1.85%
9.0	1	1.85%
Other	0	0.00%
InterScan VirusWall (23 servers)
Version	Number of Servers	Percent
Other	23	100.00%
VisNetic (16 servers)
Version	Number of Servers	Percent
9.3.2.0	6	37.50%
5.5.8.3	2	12.50%
6.2.2.0	1	6.25%
8.0.3	1	6.25%
5.8.6.6	1	6.25%
9.1.4.0	1	6.25%
5.0.2.3	1	6.25%
8.0.3.1	1	6.25%
5.0.2.0	1	6.25%
8.5.0.8	1	6.25%
Other	0	0.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
7.3	6	50.00%
8.4	4	33.33%
8.3	1	8.33%
8.2	1	8.33%
Other	0	0.00%
Mirapoint (8 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	25.00%
4.3.5-GA	2	25.00%
4.4.3-GA	2	25.00%
3.10.10a-GA	1	12.50%
4.4.6-GA	1	12.50%
Other	0	0.00%
Mercury (7 servers)
Version	Number of Servers	Percent
3.32	4	57.14%
1.48	2	28.57%
3.21	1	14.29%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
Neon Mail Server (5 servers)
Version	Number of Servers	Percent
3.1.3	1	20.00%
3.0.7	1	20.00%
3.1.0	1	20.00%
3.1.5	1	20.00%
3.1.2	1	20.00%
Other	0	0.00%
WebSTAR V (4 servers)
Version	Number of Servers	Percent
5.4.1	4	100.00%
Other	0	0.00%
MessageWall (3 servers)
Version	Number of Servers	Percent
1.0.8	3	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%