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	656,938	100.0%
Number of Servers that didn't respond	95,865	14.59%
Server didn't open socket	94,532	14.39%
Server didn't provide banner	1,333	0.20%
Server provided banner	561,073	85.41%
Server banner identifies software in use	380,744	57.96%

As indicated by the above table, of the 656,938 servers queried, only 380,744 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	230,403	60.51%
Postfix	125,694	33.01%
Sendmail	13,467	3.54%
MailEnable	7,147	1.88%
MDaemon	1,482	0.39%
Microsoft	686	0.18%
CommuniGate Pro	405	0.11%
IMail	265	0.07%
XMail	250	0.07%
OpenSMTPD	209	0.05%
SurgeSMTP	192	0.05%
Qmail Toaster	140	0.04%
MagicMail	92	0.02%
Lotus Domino	67	0.02%
WinWebMail	59	0.02%
Merak	46	0.01%
Kerio	41	0.01%
Post.Office	34	0.01%
ArGoSoft	23	0.01%
GroupWise	19	0.00%
Gordano Messaging Suite (GMS)	6	0.00%
OpenVMS	4	0.00%
Trend Micro	4	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (230,403 servers)
Version	Number of Servers	Percent
4.96	124,529	54.05%
4.95	68,924	29.91%
4.94.2	10,491	4.55%
4.93	8,087	3.51%
4.92	3,092	1.34%
Other	15,280	6.63%
Postfix (125,694 servers)
Version	Number of Servers	Percent
Other	125,694	100.00%
Sendmail (13,467 servers)
Version	Number of Servers	Percent
8.15.2	4,456	33.09%
8.16.1	4,263	31.66%
8.14.7	1,418	10.53%
8.14.4	1,239	9.20%
8.13.8	578	4.29%
8.14.5	309	2.29%
8.17.1	260	1.93%
8.14.9	204	1.51%
8.13.1	171	1.27%
Other	569	4.23%
MailEnable (7,147 servers)
Version	Number of Servers	Percent
10.43--	2,263	31.66%
10.42--	867	12.13%
10.34--	518	7.25%
10.27--	285	3.99%
10.25--	245	3.43%
10.43-10.43-	165	2.31%
10.45--	133	1.86%
9.00--	121	1.69%
10.43--10.43	120	1.68%
10.45--10.45	106	1.48%
9.00--9.00	89	1.25%
Other	2,235	31.27%
MDaemon (1,482 servers)
Version	Number of Servers	Percent
23.0.0	209	14.10%
22.0.3	106	7.15%
21.5.2	91	6.14%
13.5.1	83	5.60%
13.0.5	61	4.12%
11.0.3	55	3.71%
11.0.0	54	3.64%
13.0.4	50	3.37%
19.5.4	37	2.50%
16.5.2	35	2.36%
12.5.6	32	2.16%
14.5.2	31	2.09%
19.5.5	27	1.82%
22.0.2	24	1.62%
10.0.0	18	1.21%
21.0.3	16	1.08%
Other	553	37.31%
Microsoft (686 servers)
Version	Number of Servers	Percent
6.0.3790.4675	188	27.41%
8.5.9600.16384	100	14.58%
10.0.14393.4169	91	13.27%
10.0.17763.1697	89	12.97%
7.5.7601.17514	50	7.29%
6.0.3790.3959	38	5.54%
5.0.2195.5329	28	4.08%
5.0.2195.6713	16	2.33%
8.0.9200.16384	13	1.90%
10.0.17763.1	12	1.75%
10.0.14393.0	7	1.02%
Other	54	7.87%
CommuniGate Pro (405 servers)
Version	Number of Servers	Percent
6.2.15	38	9.38%
6.2.14	33	8.15%
6.3.17	29	7.16%
6.1.20	17	4.20%
6.3.18	14	3.46%
6.3.14	11	2.72%
6.0.9	10	2.47%
5.2.20	9	2.22%
6.1.18	9	2.22%
6.1.16	8	1.98%
6.3.6	8	1.98%
5.1.16	7	1.73%
6.0.11	7	1.73%
5.4.11	7	1.73%
7.1.4	6	1.48%
6.3.16	6	1.48%
6.2.12	6	1.48%
6.3.13	6	1.48%
6.3.15	5	1.23%
6.3.5	5	1.23%
5.1.7	5	1.23%
Other	159	39.26%
IMail (265 servers)
Version	Number of Servers	Percent
12.5.7.59	28	10.57%
12.5.8.41	23	8.68%
12.5.6.101	21	7.92%
9.23	18	6.79%
12.6.0.17	16	6.04%
12.5.8.58	15	5.66%
12.5.8.59	15	5.66%
8.22	11	4.15%
12.5.6.105	11	4.15%
12.5.3.93	10	3.77%
8.05	10	3.77%
12.5.8.54	9	3.40%
12.4.1.15	8	3.02%
8.15	8	3.02%
12.3.0.100	8	3.02%
12.5.4.146	6	2.26%
12.5.5.115	6	2.26%
12.5.5.117	4	1.51%
11.5	4	1.51%
6.04	3	1.13%
10.02	3	1.13%
5.05	3	1.13%
12.6.0.19	3	1.13%
Other	22	8.30%
XMail (250 servers)
Version	Number of Servers	Percent
1.27	147	58.80%
1.22	65	26.00%
1.25	12	4.80%
1.26	11	4.40%
1.24	5	2.00%
1.15	3	1.20%
Other	7	2.80%
OpenSMTPD (209 servers)
Version	Number of Servers	Percent
Other	209	100.00%
SurgeSMTP (192 servers)
Version	Number of Servers	Percent
7.7c-1	30	15.62%
7.6u-1	19	9.90%
7.6j-1	15	7.81%
7.3o4-4	14	7.29%
7.5c-1	13	6.77%
7.3e2-2	11	5.73%
7.5a-1	8	4.17%
7.1e-1	7	3.65%
6.9c-1	6	3.12%
7.6h-2	6	3.12%
7.6s-1	5	2.60%
7.6d-1	4	2.08%
6.5a2-2	4	2.08%
7.4e-1	4	2.08%
7.3i2-2	3	1.56%
7.4o-1	3	1.56%
7.7d-9	3	1.56%
3.9e-1	3	1.56%
7.7b-3	2	1.04%
7.3c3-3	2	1.04%
7.6q-1	2	1.04%
6.8g-1	2	1.04%
7.3n-1	2	1.04%
7.1f-15	2	1.04%
6.5a-1	2	1.04%
6.7c-1	2	1.04%
Other	18	9.38%
Qmail Toaster (140 servers)
Version	Number of Servers	Percent
1.03	72	51.43%
1.3	60	42.86%
1.03.5	5	3.57%
1.03.6	2	1.43%
Other	1	0.71%
MagicMail (92 servers)
Version	Number of Servers	Percent
Other	92	100.00%
Lotus Domino (67 servers)
Version	Number of Servers	Percent
8.5.3FP6	14	20.90%
8.5.3	12	17.91%
7.0	5	7.46%
7.0.3	3	4.48%
8.5.2FP2	3	4.48%
8.5.1	3	4.48%
8.5.2FP1	2	2.99%
8.5.3FP1	2	2.99%
8.0	2	2.99%
8.5.1FP5	2	2.99%
6.5.3	2	2.99%
7.0.2	2	2.99%
8.5.3FP5	1	1.49%
6.5.4	1	1.49%
6.0.1	1	1.49%
8.5.2	1	1.49%
5.0.8	1	1.49%
8.5.3FP3	1	1.49%
8.5.2FP3	1	1.49%
8.0.1	1	1.49%
8.5.3FP4	1	1.49%
7.0.4FP1	1	1.49%
5.0.11	1	1.49%
6.5.2	1	1.49%
7.0.3FP1	1	1.49%
7.0.4FP2	1	1.49%
6.5	1	1.49%
Other	0	0.00%
WinWebMail (59 servers)
Version	Number of Servers	Percent
4.4.0.1	12	20.34%
4.2.0.1	10	16.95%
3.9.0.7	8	13.56%
4.3.0.1	5	8.47%
3.8.6.1	4	6.78%
3.7.3.1	3	5.08%
3.8.0.1	3	5.08%
3.8.1.3	3	5.08%
3.8.1.5	2	3.39%
3.8.3.1	1	1.69%
1.0	1	1.69%
3.7.6.1	1	1.69%
4.1.0.1	1	1.69%
3.9.3.1	1	1.69%
3.9.2.1	1	1.69%
3.9.0.1	1	1.69%
3.8.1.6	1	1.69%
4.0.0.1	1	1.69%
Other	0	0.00%
Merak (46 servers)
Version	Number of Servers	Percent
8.0.3	13	28.26%
8.9.1	12	26.09%
7.6.1	7	15.22%
8.3.8	3	6.52%
7.4.5	2	4.35%
8.0.1	1	2.17%
8.9.2	1	2.17%
8.3.6	1	2.17%
6.1.0	1	2.17%
8.5.0	1	2.17%
4.2.1	1	2.17%
7.6.0	1	2.17%
6.0.8	1	2.17%
5.8.2	1	2.17%
Other	0	0.00%
Kerio (41 servers)
Version	Number of Servers	Percent
6.7.3	8	19.51%
6.6.1	6	14.63%
6.7.1	5	12.20%
6.7.0	5	12.20%
6.5.2	4	9.76%
6.6.2	4	9.76%
5.7.9	2	4.88%
6.7.2	2	4.88%
6.5.1	2	4.88%
6.0.10	1	2.44%
6.3.1	1	2.44%
6.0.8	1	2.44%
Other	0	0.00%
Post.Office (34 servers)
Version	Number of Servers	Percent
4.4	13	38.24%
4.2.2	7	20.59%
4.3	6	17.65%
4.2	2	5.88%
3.5.3	2	5.88%
4.1.2.4	1	2.94%
3.9.2	1	2.94%
4.1	1	2.94%
3.1.2	1	2.94%
Other	0	0.00%
ArGoSoft (23 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	7	30.43%
1.8 (1.8.9.3)	4	17.39%
1.8 (1.8.8.8)	2	8.70%
1.8 (1.8.8.7)	2	8.70%
1.8 (1.8.9.2)	2	8.70%
1.8 (1.8.8.9)	1	4.35%
1.8 (1.8.7.3)	1	4.35%
1.8 (1.8.8.4)	1	4.35%
1.8 (1.8.9.1)	1	4.35%
1.8 (1.8.9.4)	1	4.35%
1.8 (1.8.9.5)	1	4.35%
Other	0	0.00%
GroupWise (19 servers)
Version	Number of Servers	Percent
18.4.2	3	15.79%
18.3.1	3	15.79%
18.2.1	2	10.53%
14.2.2	2	10.53%
6.5.7	1	5.26%
14.2.1	1	5.26%
14.2.3	1	5.26%
18.0.0	1	5.26%
18.1.1	1	5.26%
8.0.3	1	5.26%
14.0.0	1	5.26%
18.2.0	1	5.26%
18.0.2	1	5.26%
Other	0	0.00%
Gordano Messaging Suite (GMS) (6 servers)
Version	Number of Servers	Percent
Other	6	100.00%
OpenVMS (4 servers)
Version	Number of Servers	Percent
7.3	2	50.00%
8.4	1	25.00%
8.2	1	25.00%
Other	0	0.00%
Trend Micro (4 servers)
Version	Number of Servers	Percent
5.18	3	75.00%
5.7	1	25.00%
Other	0	0.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	3	75.00%
8.0.3	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 (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%