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	1,105,696	100.0%
Number of Servers that didn't respond	173,891	15.73%
Server didn't open socket	170,907	15.46%
Server didn't provide banner	2,984	0.27%
Server provided banner	931,805	84.27%
Server banner identifies software in use	596,876	53.98%

As indicated by the above table, of the 1,105,696 servers queried, only 596,876 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	357,325	59.87%
Postfix	195,954	32.83%
Sendmail	21,590	3.62%
MailEnable	12,387	2.08%
MDaemon	3,781	0.63%
Microsoft	1,968	0.33%
CommuniGate Pro	762	0.13%
IMail	625	0.10%
Qmail Toaster	492	0.08%
XMail	460	0.08%
SurgeSMTP	327	0.05%
OpenSMTPD	244	0.04%
Lotus Domino	218	0.04%
WinWebMail	168	0.03%
MagicMail	127	0.02%
Kerio	113	0.02%
Merak	96	0.02%
Post.Office	67	0.01%
ArGoSoft	55	0.01%
GroupWise	48	0.01%
Gordano Messaging Suite (GMS)	24	0.00%
Trend Micro	17	0.00%
OpenVMS	9	0.00%
VisNetic	7	0.00%
InterScan VirusWall	3	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
Mercury	1	0.00%
WebSTAR V	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (357,325 servers)
Version	Number of Servers	Percent
4.93	269,163	75.33%
4.94	18,335	5.13%
4.91	15,513	4.34%
4.92	10,640	2.98%
4.92.3	7,717	2.16%
4.93.0.4	5,365	1.50%
4.89	5,228	1.46%
4.87	4,597	1.29%
4.84	4,144	1.16%
Other	16,623	4.65%
Postfix (195,954 servers)
Version	Number of Servers	Percent
Other	195,954	100.00%
Sendmail (21,590 servers)
Version	Number of Servers	Percent
8.15.2	10,487	48.57%
8.14.4	3,506	16.24%
8.14.7	2,025	9.38%
8.13.8	1,559	7.22%
8.14.5	1,373	6.36%
8.14.9	652	3.02%
8.13.1	453	2.10%
8.14.3	316	1.46%
Other	1,219	5.65%
MailEnable (12,387 servers)
Version	Number of Servers	Percent
10.27--	3,060	24.70%
10.25--	2,563	20.69%
9.00--	474	3.83%
10.29--	274	2.21%
10.31--	241	1.95%
10.30--	232	1.87%
10.31--10.31	182	1.47%
9.16--	182	1.47%
10.12--	178	1.44%
10.31-10.31-	160	1.29%
9.00--9.00	141	1.14%
8.60--	132	1.07%
Other	4,568	36.88%
MDaemon (3,781 servers)
Version	Number of Servers	Percent
19.5.5	410	10.84%
20.0.3	303	8.01%
13.5.1	247	6.53%
13.0.5	162	4.28%
13.0.4	154	4.07%
11.0.3	139	3.68%
11.0.0	131	3.46%
13.6.3	128	3.39%
16.5.2	105	2.78%
20.0.2	91	2.41%
12.5.6	84	2.22%
12.5.4	80	2.12%
14.5.2	78	2.06%
19.5.4	59	1.56%
10.1.2	48	1.27%
10.0.0	43	1.14%
10.1.0	41	1.08%
15.0.3	40	1.06%
19.0.3	39	1.03%
16.0.4	39	1.03%
Other	1,360	35.97%
Microsoft (1,968 servers)
Version	Number of Servers	Percent
6.0.3790.4675	769	39.08%
8.5.9600.16384	315	16.01%
7.5.7601.17514	206	10.47%
10.0.14393.2608	175	8.89%
6.0.3790.3959	106	5.39%
10.0.17763.1	88	4.47%
5.0.2195.5329	69	3.51%
8.0.9200.16384	46	2.34%
5.0.2195.6713	28	1.42%
6.0.3790.1830	27	1.37%
7.0.6002.18264	23	1.17%
5.0.2195.7381	21	1.07%
Other	95	4.83%
CommuniGate Pro (762 servers)
Version	Number of Servers	Percent
6.2.14	87	11.42%
6.2.15	54	7.09%
6.1.20	37	4.86%
6.1.16	27	3.54%
5.3.13	27	3.54%
6.2.12	26	3.41%
6.0.11	22	2.89%
5.2.20	21	2.76%
6.1.18	21	2.76%
5.4.11	19	2.49%
6.3.3	19	2.49%
5.1.16	16	2.10%
6.0.9	13	1.71%
6.2.13	12	1.57%
6.1.9	10	1.31%
6.0.7	9	1.18%
6.2.9	9	1.18%
6.2.7	9	1.18%
5.4.8	8	1.05%
6.1.10	8	1.05%
5.3.15	8	1.05%
6.1.14	8	1.05%
6.2.10	8	1.05%
Other	284	37.27%
IMail (625 servers)
Version	Number of Servers	Percent
12.5.8.41	84	13.44%
12.5.6.101	74	11.84%
12.5.7.59	72	11.52%
12.4.1.15	52	8.32%
12.5.3.93	35	5.60%
9.23	34	5.44%
8.22	34	5.44%
12.5.5.115	27	4.32%
8.05	26	4.16%
12.3.0.100	24	3.84%
8.15	22	3.52%
10.02	15	2.40%
12.5.4.146	12	1.92%
12.5.6.105	11	1.76%
12.5.7.58	9	1.44%
12.5.5.117	9	1.44%
11.5	9	1.44%
7.07	8	1.28%
11.03	7	1.12%
Other	61	9.76%
Qmail Toaster (492 servers)
Version	Number of Servers	Percent
1.3	367	74.59%
1.03	112	22.76%
1.03.5	7	1.42%
Other	6	1.22%
XMail (460 servers)
Version	Number of Servers	Percent
1.27	229	49.78%
1.22	153	33.26%
1.26	23	5.00%
1.25	20	4.35%
1.24	13	2.83%
1.15	5	1.09%
Other	17	3.70%
SurgeSMTP (327 servers)
Version	Number of Servers	Percent
7.4o-1	60	18.35%
7.3o4-4	48	14.68%
7.3e2-2	25	7.65%
7.4e-1	21	6.42%
7.1e-1	17	5.20%
6.5a2-2	14	4.28%
7.3i2-2	11	3.36%
7.2i-1	10	3.06%
6.7c-1	9	2.75%
7.4m-1	7	2.14%
7.2a-1	7	2.14%
7.4q-1	6	1.83%
7.5a-1	6	1.83%
3.9e-1	6	1.83%
7.4g-1	5	1.53%
6.5a-1	5	1.53%
6.9c-1	4	1.22%
Other	66	20.18%
OpenSMTPD (244 servers)
Version	Number of Servers	Percent
Other	244	100.00%
Lotus Domino (218 servers)
Version	Number of Servers	Percent
8.5.3FP6	41	18.81%
8.5.3	37	16.97%
8.5.1	12	5.50%
8.5.2	10	4.59%
8.5.2FP2	9	4.13%
7.0	8	3.67%
7.0.2	7	3.21%
8.5	6	2.75%
7.0.3	6	2.75%
8.5.3FP5	5	2.29%
8.5.3FP4	5	2.29%
6.5.4	4	1.83%
8.5.3FP1	4	1.83%
8.5.3FP3	4	1.83%
8.5.2FP3	4	1.83%
7.0.4	4	1.83%
8.5.2FP4HF759	3	1.38%
8.0.1	3	1.38%
5.0.8	3	1.38%
Other	43	19.72%
WinWebMail (168 servers)
Version	Number of Servers	Percent
4.2.0.1	43	25.60%
3.9.0.7	36	21.43%
3.8.1.3	13	7.74%
3.7.6.1	7	4.17%
4.0.0.1	7	4.17%
3.7.3.1	6	3.57%
3.8.5.1	6	3.57%
4.3.0.1	6	3.57%
3.8.6.1	5	2.98%
3.9.0.1	5	2.98%
4.1.0.1	4	2.38%
3.8.3.1	4	2.38%
3.8.0.1	4	2.38%
3.8.1.1	4	2.38%
1.0	3	1.79%
3.9.2.1	3	1.79%
3.8.1.5	2	1.19%
3.7.5.1	2	1.19%
Other	8	4.76%
MagicMail (127 servers)
Version	Number of Servers	Percent
Other	127	100.00%
Kerio (113 servers)
Version	Number of Servers	Percent
6.7.3	25	22.12%
6.7.0	18	15.93%
6.7.2	13	11.50%
6.6.2	11	9.73%
6.6.1	9	7.96%
6.7.1	8	7.08%
6.5.2	6	5.31%
6.5.0	6	5.31%
6.4.1	3	2.65%
6.3.0	2	1.77%
5.7.9	2	1.77%
5.7.6	2	1.77%
6.5.1	2	1.77%
Other	6	5.31%
Merak (96 servers)
Version	Number of Servers	Percent
8.9.1	25	26.04%
8.0.3	25	26.04%
7.6.1	8	8.33%
8.5.0	6	6.25%
9.0.3	5	5.21%
7.4.5	5	5.21%
8.3.8	4	4.17%
7.5.2	2	2.08%
7.6.0	2	2.08%
7.6.4	2	2.08%
6.0.8	2	2.08%
8.0.1	1	1.04%
8.9.2	1	1.04%
8.3.6	1	1.04%
6.1.0	1	1.04%
5.8.2	1	1.04%
8.9.7	1	1.04%
7.4.4	1	1.04%
7.0.1	1	1.04%
8.9.0	1	1.04%
6.0.3	1	1.04%
Other	0	0.00%
Post.Office (67 servers)
Version	Number of Servers	Percent
4.3	18	26.87%
4.2.2	15	22.39%
4.4	14	20.90%
4.1.2.4	5	7.46%
3.5.3	5	7.46%
3.9.2	2	2.99%
4.1.1	2	2.99%
3.5.3J	1	1.49%
3.6.2	1	1.49%
4.1.0.3	1	1.49%
4.1	1	1.49%
3.1.2	1	1.49%
4.2.1.1	1	1.49%
Other	0	0.00%
ArGoSoft (55 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	17	30.91%
1.8 (1.8.9.3)	11	20.00%
1.8 (1.8.9.5)	7	12.73%
1.8 (1.8.9.1)	4	7.27%
1.8 (1.8.8.8)	2	3.64%
1.8 (1.8.7.3)	2	3.64%
1.8 (1.8.8.9)	2	3.64%
1.8 (1.8.9.2)	2	3.64%
1.8 (1.8.6.1)	1	1.82%
1.8 (1.8.7.6)	1	1.82%
1.8 (1.8.5.8)	1	1.82%
1.8 (1.8.8.4)	1	1.82%
1.8 (1.8.2.1)	1	1.82%
1.8 (1.8.6.0)	1	1.82%
1.8 (1.8.9.4)	1	1.82%
1.8 (1.8.2.5)	1	1.82%
Other	0	0.00%
GroupWise (48 servers)
Version	Number of Servers	Percent
18.1.1	8	16.67%
18.2.1	6	12.50%
14.2.0	4	8.33%
18.2.0	4	8.33%
14.2.1	4	8.33%
14.2.2	3	6.25%
18.0.2	3	6.25%
18.1.0	3	6.25%
14.0.0	2	4.17%
18.0.0	2	4.17%
14.2.3	2	4.17%
6.5.7	1	2.08%
14.0.1	1	2.08%
6.5.0	1	2.08%
7.0.1	1	2.08%
7.0.2	1	2.08%
6.0.2	1	2.08%
8.0.2	1	2.08%
Other	0	0.00%
Gordano Messaging Suite (GMS) (24 servers)
Version	Number of Servers	Percent
Other	24	100.00%
Trend Micro (17 servers)
Version	Number of Servers	Percent
5.7	6	35.29%
5.18	4	23.53%
5.5	2	11.76%
7.5	2	11.76%
7.0	2	11.76%
7.1	1	5.88%
Other	0	0.00%
OpenVMS (9 servers)
Version	Number of Servers	Percent
8.4	5	55.56%
7.3	2	22.22%
8.2	1	11.11%
8.3	1	11.11%
Other	0	0.00%
VisNetic (7 servers)
Version	Number of Servers	Percent
9.3.2.0	5	71.43%
8.0.3	1	14.29%
6.2.2.0	1	14.29%
Other	0	0.00%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.8-Build_1080	1	50.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.4.1	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%