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	1,201,857	100.0%
Number of Servers that didn't respond	232,027	19.31%
Server didn't open socket	229,110	19.06%
Server didn't provide banner	2,917	0.24%
Server provided banner	969,830	80.69%
Server banner identifies software in use	609,378	50.70%

As indicated by the above table, of the 1,201,857 servers queried, only 609,378 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	339,579	55.73%
Postfix	229,707	37.70%
Sendmail	21,001	3.45%
MailEnable	11,106	1.82%
MDaemon	2,810	0.46%
Microsoft	1,450	0.24%
CommuniGate Pro	814	0.13%
OpenSMTPD	579	0.10%
IMail	487	0.08%
XMail	458	0.08%
SurgeSMTP	335	0.05%
Qmail Toaster	202	0.03%
WinWebMail	194	0.03%
Lotus Domino	157	0.03%
MagicMail	150	0.02%
Post.Office	75	0.01%
Kerio	72	0.01%
Merak	66	0.01%
ArGoSoft	42	0.01%
GroupWise	41	0.01%
Gordano Messaging Suite (GMS)	18	0.00%
OpenVMS	10	0.00%
InterScan VirusWall	8	0.00%
Trend Micro	5	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Mercury	2	0.00%
MessageWall	2	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (339,579 servers)
Version	Number of Servers	Percent
4.96.2	230,516	67.88%
4.95	27,578	8.12%
4.96	23,046	6.79%
4.96.1	12,589	3.71%
4.93	11,497	3.39%
4.94.2	9,056	2.67%
4.92	4,687	1.38%
Other	20,610	6.07%
Postfix (229,707 servers)
Version	Number of Servers	Percent
Other	229,707	100.00%
Sendmail (21,001 servers)
Version	Number of Servers	Percent
8.16.1	6,600	31.43%
8.15.2	5,866	27.93%
8.14.7	2,305	10.98%
8.14.4	2,028	9.66%
8.13.8	959	4.57%
8.14.5	952	4.53%
8.17.1	472	2.25%
8.13.1	305	1.45%
8.14.9	287	1.37%
8.17.2	227	1.08%
Other	1,000	4.76%
MailEnable (11,106 servers)
Version	Number of Servers	Percent
10.46--	4,377	39.41%
10.34--	563	5.07%
10.43--	502	4.52%
10.27--	363	3.27%
10.25--	333	3.00%
10.47--	298	2.68%
10.47--10.47	254	2.29%
10.42--	215	1.94%
10.43-10.43-	207	1.86%
10.47-10.47-	193	1.74%
9.00--	165	1.49%
10.45--	139	1.25%
Other	3,497	31.49%
MDaemon (2,810 servers)
Version	Number of Servers	Percent
23.5.0	394	14.02%
23.0.2	231	8.22%
13.5.1	144	5.12%
19.5.4	116	4.13%
13.0.5	97	3.45%
11.0.3	94	3.35%
11.0.0	94	3.35%
23.0.1	94	3.35%
13.0.4	91	3.24%
21.5.4	72	2.56%
16.5.2	63	2.24%
14.5.2	58	2.06%
22.0.3	55	1.96%
21.5.2	53	1.89%
12.5.6	50	1.78%
19.5.5	36	1.28%
12.5.4	33	1.17%
10.0.0	30	1.07%
Other	1,005	35.77%
Microsoft (1,450 servers)
Version	Number of Servers	Percent
6.0.3790.4675	383	26.41%
10.0.17763.1697	251	17.31%
8.5.9600.16384	192	13.24%
10.0.14393.4169	156	10.76%
7.5.7601.17514	104	7.17%
6.0.3790.3959	81	5.59%
5.0.2195.5329	59	4.07%
8.0.9200.16384	33	2.28%
5.0.2195.6713	22	1.52%
10.0.20348.1	20	1.38%
5.0.2195.7381	16	1.10%
6.0.3790.1830	16	1.10%
10.0.17763.1	15	1.03%
7.0.6002.18264	15	1.03%
Other	87	6.00%
CommuniGate Pro (814 servers)
Version	Number of Servers	Percent
6.2.15	80	9.83%
6.2.14	60	7.37%
6.3.17	39	4.79%
6.4.0	35	4.30%
6.1.20	32	3.93%
6.3.20	27	3.32%
6.3.18	24	2.95%
6.4.1	23	2.83%
5.4.11	16	1.97%
6.3.19	16	1.97%
6.0.9	15	1.84%
6.0.11	15	1.84%
6.1.16	13	1.60%
6.1.18	12	1.47%
5.2.20	11	1.35%
6.3.14	10	1.23%
6.3.15	10	1.23%
6.2.12	10	1.23%
6.3.6	10	1.23%
5.1.16	9	1.11%
Other	347	42.63%
OpenSMTPD (579 servers)
Version	Number of Servers	Percent
Other	579	100.00%
IMail (487 servers)
Version	Number of Servers	Percent
12.5.8.41	47	9.65%
12.5.6.101	43	8.83%
9.23	34	6.98%
12.6.0.17	32	6.57%
12.5.8.54	29	5.95%
12.5.7.59	27	5.54%
12.5.6.105	25	5.13%
12.5.8.58	24	4.93%
12.4.1.15	24	4.93%
8.22	23	4.72%
12.5.8.59	20	4.11%
12.5.3.93	19	3.90%
8.05	17	3.49%
12.6.0.20	14	2.87%
12.5.5.115	13	2.67%
12.5.4.146	12	2.46%
12.6.0.19	8	1.64%
11.5	7	1.44%
12.3.0.100	6	1.23%
8.00	5	1.03%
10.02	5	1.03%
8.15	5	1.03%
12.5.5.117	5	1.03%
Other	43	8.83%
XMail (458 servers)
Version	Number of Servers	Percent
1.27	280	61.14%
1.22	114	24.89%
1.26	18	3.93%
1.25	16	3.49%
1.24	13	2.84%
1.15	5	1.09%
Other	12	2.62%
SurgeSMTP (335 servers)
Version	Number of Servers	Percent
7.7c-1	60	17.91%
7.3o4-4	25	7.46%
7.6j-1	24	7.16%
7.5c-1	19	5.67%
7.6u-1	17	5.07%
7.3e2-2	15	4.48%
7.7i-1	13	3.88%
7.1e-1	10	2.99%
7.5a-1	10	2.99%
6.5a2-2	9	2.69%
6.9c-1	9	2.69%
7.4o-1	8	2.39%
7.6s-1	8	2.39%
7.6h-2	8	2.39%
7.4e-1	8	2.39%
7.7j-1	6	1.79%
7.7g-1	6	1.79%
7.3i2-2	5	1.49%
6.7c-1	5	1.49%
7.7h-3	5	1.49%
7.2i-1	5	1.49%
7.6d-1	5	1.49%
6.5a-1	4	1.19%
Other	51	15.22%
Qmail Toaster (202 servers)
Version	Number of Servers	Percent
1.03	110	54.46%
1.3	84	41.58%
1.03.5	4	1.98%
1.03.6	3	1.49%
Other	1	0.50%
WinWebMail (194 servers)
Version	Number of Servers	Percent
4.4.0.1	35	18.04%
4.2.0.1	27	13.92%
3.8.1.3	21	10.82%
3.9.0.7	16	8.25%
4.5.0.1	14	7.22%
3.9.0.1	7	3.61%
4.1.0.1	7	3.61%
4.3.0.1	7	3.61%
3.8.0.1	7	3.61%
3.7.3.1	7	3.61%
3.8.6.1	6	3.09%
3.7.7.3	5	2.58%
4.0.0.1	5	2.58%
3.9.2.1	4	2.06%
3.9.3.1	3	1.55%
3.8.1.5	3	1.55%
3.7.1.1	3	1.55%
3.8.5.1	3	1.55%
3.8.3.1	2	1.03%
3.7.6.1	2	1.03%
3.9.0.3	2	1.03%
3.9.5.3	2	1.03%
Other	6	3.09%
Lotus Domino (157 servers)
Version	Number of Servers	Percent
8.5.3FP6	30	19.11%
8.5.3	24	15.29%
7.0	7	4.46%
8.5	7	4.46%
8.5.2	7	4.46%
8.5.1	7	4.46%
6.5	6	3.82%
7.0.2	6	3.82%
6.5.3	4	2.55%
8.0	4	2.55%
7.0.3	4	2.55%
8.0.1	4	2.55%
8.5.2FP1	3	1.91%
8.5.1FP5	3	1.91%
6.5.1	3	1.91%
8.5.3FP3	3	1.91%
8.5.3FP5	2	1.27%
8.5.3FP1	2	1.27%
8.5.3FP4	2	1.27%
6.5.4	2	1.27%
8.5.2FP2	2	1.27%
8.5.2FP4	2	1.27%
Other	23	14.65%
MagicMail (150 servers)
Version	Number of Servers	Percent
Other	150	100.00%
Post.Office (75 servers)
Version	Number of Servers	Percent
4.4	36	48.00%
4.3	10	13.33%
4.2.2	10	13.33%
3.5.3	5	6.67%
4.1.2.4	5	6.67%
3.9.2	2	2.67%
4.2.1.3	2	2.67%
4.2	1	1.33%
4.0.1	1	1.33%
3.5.1	1	1.33%
3.1.2	1	1.33%
4.2.1.1	1	1.33%
Other	0	0.00%
Kerio (72 servers)
Version	Number of Servers	Percent
6.7.3	15	20.83%
6.7.0	11	15.28%
6.6.2	9	12.50%
6.6.1	9	12.50%
6.7.1	6	8.33%
6.7.2	4	5.56%
6.5.2	4	5.56%
6.4.1	2	2.78%
6.6.0	2	2.78%
6.5.0	2	2.78%
5.7.9	1	1.39%
6.0.10	1	1.39%
6.0.3	1	1.39%
6.0.5	1	1.39%
6.0.8	1	1.39%
5.7.6	1	1.39%
6.5.1	1	1.39%
6.4.0	1	1.39%
Other	0	0.00%
Merak (66 servers)
Version	Number of Servers	Percent
8.0.3	19	28.79%
8.9.1	17	25.76%
7.6.1	7	10.61%
8.3.8	5	7.58%
7.4.5	3	4.55%
6.0.8	2	3.03%
8.0.1	1	1.52%
8.9.2	1	1.52%
8.3.6	1	1.52%
6.1.0	1	1.52%
7.6.4	1	1.52%
9.0.3	1	1.52%
8.5.0	1	1.52%
7.5.2	1	1.52%
4.2.1	1	1.52%
7.6.0	1	1.52%
7.4.4	1	1.52%
7.0.1	1	1.52%
5.8.2	1	1.52%
Other	0	0.00%
ArGoSoft (42 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	13	30.95%
1.8 (1.8.9.5)	6	14.29%
1.8 (1.8.9.3)	5	11.90%
1.8 (1.8.9.1)	3	7.14%
1.8 (1.8.8.8)	2	4.76%
1.8 (1.8.7.3)	2	4.76%
1.8 (1.8.8.7)	2	4.76%
1.8 (1.8.9.2)	2	4.76%
1.8 (1.8.6.1)	1	2.38%
1.8 (1.8.3.5)	1	2.38%
1.8 (1.8.7.6)	1	2.38%
1.8 (1.8.6.0)	1	2.38%
1.8 (1.8.9.4)	1	2.38%
1.8 (1.8.5.9)	1	2.38%
1.8 (1.8.8.9)	1	2.38%
Other	0	0.00%
GroupWise (41 servers)
Version	Number of Servers	Percent
18.3.1	11	26.83%
18.4.2	6	14.63%
18.5.0	5	12.20%
18.2.1	4	9.76%
18.2.0	3	7.32%
18.1.1	2	4.88%
6.5.7	1	2.44%
23.4.0	1	2.44%
14.2.3	1	2.44%
18.0.0	1	2.44%
6.5.0	1	2.44%
18.4.1	1	2.44%
18.1.0	1	2.44%
14.2.2	1	2.44%
14.0.0	1	2.44%
18.0.2	1	2.44%
Other	0	0.00%
Gordano Messaging Suite (GMS) (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	6	60.00%
7.3	3	30.00%
8.2	1	10.00%
Other	0	0.00%
InterScan VirusWall (8 servers)
Version	Number of Servers	Percent
Other	8	100.00%
Trend Micro (5 servers)
Version	Number of Servers	Percent
5.18	3	60.00%
5.7	1	20.00%
5.5	1	20.00%
Other	0	0.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	2	50.00%
8.0.3	1	25.00%
6.2.2.0	1	25.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Mercury (2 servers)
Version	Number of Servers	Percent
1.48	1	50.00%
4.x	1	50.00%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%