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	1,775,266	100.0%
Number of Servers that didn't respond	316,554	17.83%
Server didn't open socket	310,737	17.50%
Server didn't provide banner	5,817	0.33%
Server provided banner	1,458,712	82.17%
Server banner identifies software in use	906,028	51.04%

As indicated by the above table, of the 1,775,266 servers queried, only 906,028 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	515,963	56.95%
Postfix	311,559	34.39%
Sendmail	37,616	4.15%
MailEnable	19,578	2.16%
MDaemon	8,173	0.90%
Microsoft	5,426	0.60%
IMail	1,566	0.17%
CommuniGate Pro	1,312	0.14%
XMail	851	0.09%
Qmail Toaster	754	0.08%
Lotus Domino	572	0.06%
WinWebMail	566	0.06%
SurgeSMTP	551	0.06%
OpenSMTPD	337	0.04%
Kerio	286	0.03%
Merak	186	0.02%
MagicMail	178	0.02%
Post.Office	131	0.01%
ArGoSoft	128	0.01%
GroupWise	83	0.01%
Gordano Messaging Suite (GMS)	74	0.01%
Trend Micro	51	0.01%
InterScan VirusWall	19	0.00%
OpenVMS	17	0.00%
VisNetic	16	0.00%
Mirapoint	10	0.00%
Mercury	6	0.00%
Interscan	5	0.00%
Neon Mail Server	5	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%
MessageWall	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (515,963 servers)
Version	Number of Servers	Percent
4.91	411,422	79.74%
4.87	25,239	4.89%
4.89	24,721	4.79%
4.84	12,055	2.34%
4.90	9,357	1.81%
Other	33,169	6.43%
Postfix (311,559 servers)
Version	Number of Servers	Percent
Other	311,559	100.00%
Sendmail (37,616 servers)
Version	Number of Servers	Percent
8.15.2	11,885	31.60%
8.14.4	7,626	20.27%
8.13.8	4,540	12.07%
8.14.5	3,028	8.05%
8.14.7	2,991	7.95%
8.13.1	2,704	7.19%
8.14.9	1,552	4.13%
8.14.3	838	2.23%
Other	2,452	6.52%
MailEnable (19,578 servers)
Version	Number of Servers	Percent
10.12--	3,663	18.71%
9.00--	1,644	8.40%
9.16--	1,570	8.02%
8.60--	572	2.92%
8.53--	477	2.44%
6.5--	416	2.12%
10.20--	382	1.95%
8.51--	346	1.77%
8.60-8.60-	322	1.64%
10.18--	273	1.39%
10.16--	270	1.38%
8.04--	267	1.36%
10.19--	265	1.35%
1.986--	241	1.23%
9.75--	223	1.14%
10.20--10.20	222	1.13%
9.00--9.00	208	1.06%
Other	8,217	41.97%
MDaemon (8,173 servers)
Version	Number of Servers	Percent
18.5.1	1,126	13.78%
13.5.1	478	5.85%
13.6.3	406	4.97%
13.0.4	337	4.12%
13.0.5	319	3.90%
11.0.3	314	3.84%
11.0.0	313	3.83%
16.5.2	310	3.79%
18.0.2	218	2.67%
18.5.0	199	2.43%
12.5.4	187	2.29%
12.5.6	175	2.14%
14.5.2	155	1.90%
16.0.4	141	1.73%
15.0.3	129	1.58%
10.1.2	123	1.50%
10.0.0	119	1.46%
17.5.3	109	1.33%
17.5.2	106	1.30%
10.1.0	101	1.24%
16.5.1	94	1.15%
13.0.2	86	1.05%
Other	2,628	32.15%
Microsoft (5,426 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,682	49.43%
7.5.7601.17514	697	12.85%
8.5.9600.16384	666	12.27%
6.0.3790.3959	321	5.92%
10.0.14393.2608	159	2.93%
8.0.9200.16384	154	2.84%
5.0.2195.5329	131	2.41%
7.0.6002.18264	90	1.66%
6.0.3790.1830	88	1.62%
10.0.14393.0	78	1.44%
5.0.2195.6713	66	1.22%
Other	294	5.42%
IMail (1,566 servers)
Version	Number of Servers	Percent
12.5.6.101	338	21.58%
8.22	149	9.51%
12.4.1.15	146	9.32%
12.5.5.115	97	6.19%
12.5.3.93	92	5.87%
12.5.4.146	91	5.81%
9.23	87	5.56%
12.3.0.100	77	4.92%
8.15	70	4.47%
11.03	48	3.07%
8.05	45	2.87%
12.5.5.117	22	1.40%
11.5	21	1.34%
10.02	20	1.28%
7.07	18	1.15%
10.01	17	1.09%
7.15	16	1.02%
Other	212	13.54%
CommuniGate Pro (1,312 servers)
Version	Number of Servers	Percent
6.2.10	68	5.18%
6.1.16	54	4.12%
6.0.11	53	4.04%
5.4.11	47	3.58%
6.1.18	40	3.05%
6.2.11	39	2.97%
5.2.20	36	2.74%
6.2.7	36	2.74%
5.3.13	36	2.74%
5.1.16	35	2.67%
6.1.11	28	2.13%
6.2.9	28	2.13%
6.0.9	27	2.06%
5.2.3	25	1.91%
6.1.10	25	1.91%
6.1.20	25	1.91%
6.1.19	23	1.75%
6.2.1	23	1.75%
6.1.2	23	1.75%
6.2.4	20	1.52%
6.1.15	19	1.45%
6.2.8	17	1.30%
6.1.13	17	1.30%
6.1.12	16	1.22%
6.1.14	16	1.22%
4.1.8	16	1.22%
6.1.17	16	1.22%
6.1.5	15	1.14%
6.1.9	14	1.07%
Other	475	36.20%
XMail (851 servers)
Version	Number of Servers	Percent
1.27	408	47.94%
1.22	264	31.02%
1.26	57	6.70%
1.25	49	5.76%
1.24	35	4.11%
1.21	10	1.18%
Other	28	3.29%
Qmail Toaster (754 servers)
Version	Number of Servers	Percent
1.3	607	80.50%
1.03	119	15.78%
1.03.5	10	1.33%
1.03.6	9	1.19%
Other	9	1.19%
Lotus Domino (572 servers)
Version	Number of Servers	Percent
8.5.3FP6	115	20.10%
8.5.3	85	14.86%
8.5.2	28	4.90%
7.0.2	27	4.72%
8.5	21	3.67%
8.5.1	21	3.67%
8.5.3FP1	16	2.80%
8.5.3FP2	14	2.45%
8.5.3FP3	13	2.27%
7.0	12	2.10%
7.0.3	11	1.92%
8.5.2FP2	11	1.92%
8.5.3FP4	11	1.92%
8.5.2FP4	10	1.75%
8.0	10	1.75%
8.0.1	9	1.57%
8.5.1FP5	9	1.57%
8.5.2FP3	9	1.57%
8.5.3FP5	8	1.40%
6.5	7	1.22%
7.0.4	7	1.22%
7.0.1	7	1.22%
6.5.4	6	1.05%
8.5.2FP4HF759	6	1.05%
6.5.5	6	1.05%
Other	93	16.26%
WinWebMail (566 servers)
Version	Number of Servers	Percent
3.9.0.7	97	17.14%
4.2.0.1	67	11.84%
3.8.1.3	66	11.66%
3.9.0.1	41	7.24%
3.8.0.1	35	6.18%
3.7.6.1	27	4.77%
4.1.0.1	23	4.06%
3.8.1.5	21	3.71%
4.0.0.1	18	3.18%
3.8.5.1	17	3.00%
3.7.3.1	14	2.47%
3.9.2.1	14	2.47%
3.9.3.1	13	2.30%
3.8.1.1	13	2.30%
3.8.3.1	12	2.12%
3.8.6.1	12	2.12%
3.9.5.3	11	1.94%
3.7.7.3	11	1.94%
3.8.2.1	10	1.77%
3.9.5.1	7	1.24%
3.7.1.1	6	1.06%
Other	31	5.48%
SurgeSMTP (551 servers)
Version	Number of Servers	Percent
7.3o4-4	94	17.06%
7.3e2-2	90	16.33%
7.3i2-2	59	10.71%
7.1e-1	38	6.90%
6.5a2-2	25	4.54%
7.2a-1	20	3.63%
6.7c-1	20	3.63%
6.9c-1	19	3.45%
7.2i-1	18	3.27%
7.0c2-2	14	2.54%
7.3o2-2	13	2.36%
3.9e-1	13	2.36%
6.5a-1	12	2.18%
7.2e-2	11	2.00%
5.2a-1	8	1.45%
6.1c-1	7	1.27%
6.4a-1	7	1.27%
4.0u4-4	7	1.27%
Other	76	13.79%
OpenSMTPD (337 servers)
Version	Number of Servers	Percent
Other	337	100.00%
Kerio (286 servers)
Version	Number of Servers	Percent
6.7.3	63	22.03%
6.7.0	38	13.29%
6.6.2	29	10.14%
6.7.2	27	9.44%
6.5.2	27	9.44%
6.5.0	13	4.55%
6.4.1	12	4.20%
6.6.1	12	4.20%
6.3.1	10	3.50%
6.7.1	9	3.15%
6.4.0	7	2.45%
6.6.0	6	2.10%
6.5.1	5	1.75%
6.3.0	4	1.40%
6.1.3	3	1.05%
5.7.9	3	1.05%
6.1.0	3	1.05%
Other	15	5.24%
Merak (186 servers)
Version	Number of Servers	Percent
8.0.3	46	24.73%
8.9.1	38	20.43%
8.5.0	13	6.99%
7.4.5	11	5.91%
7.6.1	10	5.38%
8.3.8	10	5.38%
7.6.4	8	4.30%
7.5.2	7	3.76%
9.0.3	7	3.76%
7.4.2	4	2.15%
7.6.0	3	1.61%
7.2.0	3	1.61%
7.0.1	3	1.61%
6.0.8	3	1.61%
4.4.1	2	1.08%
Other	18	9.68%
MagicMail (178 servers)
Version	Number of Servers	Percent
Other	178	100.00%
Post.Office (131 servers)
Version	Number of Servers	Percent
4.3	33	25.19%
4.2.2	24	18.32%
4.1.2.4	14	10.69%
4.4	13	9.92%
3.5.3	10	7.63%
4.2.1.3	6	4.58%
4.1.1	4	3.05%
4.2.1.1	3	2.29%
3.5.3J	3	2.29%
3.5.1	3	2.29%
3.9.2	2	1.53%
4.0.1	2	1.53%
3.8.7.4	2	1.53%
3.9.2.3	2	1.53%
Other	10	7.63%
ArGoSoft (128 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	47	36.72%
1.8 (1.8.9.3)	19	14.84%
1.8 (1.8.9.5)	17	13.28%
1.8 (1.8.9.1)	13	10.16%
1.8 (1.8.8.8)	4	3.12%
1.8 (1.8.7.3)	3	2.34%
1.8 (1.8.6.0)	3	2.34%
1.8 (1.8.7.6)	2	1.56%
1.8 (1.8.8.9)	2	1.56%
1.8 (1.8.8.7)	2	1.56%
1.8 (1.8.5.8)	2	1.56%
1.8 (1.8.9.2)	2	1.56%
1.8 (1.8.9.4)	2	1.56%
1.8 (1.8.2.1)	2	1.56%
Other	8	6.25%
GroupWise (83 servers)
Version	Number of Servers	Percent
14.2.2	15	18.07%
18.1.0	12	14.46%
18.0.2	8	9.64%
14.2.3	6	7.23%
14.2.0	5	6.02%
14.2.1	5	6.02%
14.0.1	4	4.82%
6.5.7	3	3.61%
7.0.3	3	3.61%
18.0.0	2	2.41%
8.0.3	2	2.41%
18.0.1	2	2.41%
14.0.0	2	2.41%
7.0.2	2	2.41%
6.0.4	2	2.41%
7.0.4	1	1.20%
6.5.0	1	1.20%
6.5.5	1	1.20%
12.0.1	1	1.20%
7.0.1	1	1.20%
8.0.0	1	1.20%
6.5.6	1	1.20%
6.5.4	1	1.20%
6.5.2	1	1.20%
6.0.2	1	1.20%
Other	0	0.00%
Gordano Messaging Suite (GMS) (74 servers)
Version	Number of Servers	Percent
Other	74	100.00%
Trend Micro (51 servers)
Version	Number of Servers	Percent
5.7	14	27.45%
5.18	12	23.53%
5.5	8	15.69%
7.0	7	13.73%
7.5	5	9.80%
8.5	1	1.96%
7.5ready	1	1.96%
8	1	1.96%
9.0	1	1.96%
7.1	1	1.96%
Other	0	0.00%
InterScan VirusWall (19 servers)
Version	Number of Servers	Percent
Other	19	100.00%
OpenVMS (17 servers)
Version	Number of Servers	Percent
8.4	9	52.94%
7.3	5	29.41%
8.3	2	11.76%
8.2	1	5.88%
Other	0	0.00%
VisNetic (16 servers)
Version	Number of Servers	Percent
9.3.2.0	8	50.00%
5.5.8.3	2	12.50%
8.0.3	1	6.25%
5.8.6.6	1	6.25%
5.0.2.3	1	6.25%
9.1.4.0	1	6.25%
5.0.2.0	1	6.25%
6.2.2.0	1	6.25%
Other	0	0.00%
Mirapoint (10 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	20.00%
4.4.3-GA	2	20.00%
4.1.9-GA	1	10.00%
4.3.6-GA	1	10.00%
3.10.10a-GA	1	10.00%
4.3.5-GA	1	10.00%
4.4.5-GA	1	10.00%
4.4.6-GA	1	10.00%
Other	0	0.00%
Mercury (6 servers)
Version	Number of Servers	Percent
3.32	3	50.00%
1.48	3	50.00%
Other	0	0.00%
Interscan (5 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	40.00%
3.81-Build_1084	1	20.00%
3.8-Build_3013	1	20.00%
3.8-Build_1080	1	20.00%
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%
3.1.2	1	20.00%
3.0.8	1	20.00%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%