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	1,732,079	100.0%
Number of Servers that didn't respond	313,608	18.11%
Server didn't open socket	308,008	17.78%
Server didn't provide banner	5,600	0.32%
Server provided banner	1,418,471	81.89%
Server banner identifies software in use	879,401	50.77%

As indicated by the above table, of the 1,732,079 servers queried, only 879,401 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	499,992	56.86%
Postfix	306,907	34.90%
Sendmail	34,551	3.93%
MailEnable	18,827	2.14%
MDaemon	7,415	0.84%
Microsoft	4,610	0.52%
IMail	1,368	0.16%
CommuniGate Pro	1,247	0.14%
XMail	799	0.09%
Qmail Toaster	726	0.08%
SurgeSMTP	525	0.06%
Lotus Domino	505	0.06%
WinWebMail	493	0.06%
OpenSMTPD	381	0.04%
Kerio	236	0.03%
MagicMail	178	0.02%
Merak	157	0.02%
Post.Office	132	0.02%
ArGoSoft	107	0.01%
GroupWise	75	0.01%
Gordano Messaging Suite (GMS)	69	0.01%
Trend Micro	43	0.00%
OpenVMS	14	0.00%
VisNetic	11	0.00%
InterScan VirusWall	11	0.00%
Mercury	6	0.00%
Interscan	4	0.00%
Mirapoint	4	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (499,992 servers)
Version	Number of Servers	Percent
4.92	371,843	74.37%
4.91	49,632	9.93%
4.87	12,963	2.59%
4.89	10,311	2.06%
4.92.1	9,754	1.95%
4.92.2	7,720	1.54%
4.84	7,520	1.50%
4.90	5,584	1.12%
Other	24,665	4.93%
Postfix (306,907 servers)
Version	Number of Servers	Percent
Other	306,907	100.00%
Sendmail (34,551 servers)
Version	Number of Servers	Percent
8.15.2	12,368	35.80%
8.14.4	6,588	19.07%
8.13.8	3,466	10.03%
8.14.7	2,921	8.45%
8.14.5	2,697	7.81%
8.13.1	2,273	6.58%
8.14.9	1,413	4.09%
8.14.3	695	2.01%
Other	2,130	6.16%
MailEnable (18,827 servers)
Version	Number of Servers	Percent
10.12--	5,954	31.62%
9.00--	1,158	6.15%
9.16--	597	3.17%
10.25--	399	2.12%
8.60--	387	2.06%
10.20--	369	1.96%
8.53--	292	1.55%
6.5--	288	1.53%
8.60-8.60-	262	1.39%
10.25-10.25-	260	1.38%
10.25--10.25	259	1.38%
10.23--	241	1.28%
8.51--	238	1.26%
10.16--	202	1.07%
9.00--9.00	197	1.05%
10.18--	194	1.03%
Other	7,530	40.00%
MDaemon (7,415 servers)
Version	Number of Servers	Percent
19.0.3	832	11.22%
13.5.1	486	6.55%
13.6.3	403	5.43%
13.0.4	310	4.18%
13.0.5	299	4.03%
11.0.0	279	3.76%
11.0.3	273	3.68%
16.5.2	225	3.03%
19.0.2	168	2.27%
12.5.4	161	2.17%
12.5.6	157	2.12%
14.5.2	155	2.09%
18.5.3	145	1.96%
18.5.1	136	1.83%
19.0.1	121	1.63%
18.5.2	116	1.56%
10.1.2	101	1.36%
15.0.3	98	1.32%
19.0.0	98	1.32%
10.0.0	95	1.28%
16.0.4	92	1.24%
18.0.2	81	1.09%
10.1.0	76	1.02%
Other	2,508	33.82%
Microsoft (4,610 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,105	45.66%
8.5.9600.16384	611	13.25%
7.5.7601.17514	576	12.49%
6.0.3790.3959	269	5.84%
10.0.14393.2608	236	5.12%
8.0.9200.16384	139	3.02%
5.0.2195.5329	134	2.91%
7.0.6002.18264	77	1.67%
6.0.3790.1830	77	1.67%
5.0.2195.6713	60	1.30%
5.0.2195.7381	48	1.04%
Other	278	6.03%
IMail (1,368 servers)
Version	Number of Servers	Percent
12.5.6.101	187	13.67%
12.5.7.59	163	11.92%
12.4.1.15	124	9.06%
8.22	114	8.33%
12.5.5.115	81	5.92%
9.23	79	5.77%
12.5.3.93	76	5.56%
12.3.0.100	61	4.46%
8.15	51	3.73%
12.5.4.146	46	3.36%
8.05	43	3.14%
11.03	37	2.70%
12.5.7.58	35	2.56%
10.02	22	1.61%
12.5.5.117	21	1.54%
11.5	17	1.24%
12.5.6.105	17	1.24%
7.15	16	1.17%
10.01	14	1.02%
Other	164	11.99%
CommuniGate Pro (1,247 servers)
Version	Number of Servers	Percent
6.2.12	86	6.90%
6.1.16	53	4.25%
6.2.13	49	3.93%
6.0.11	46	3.69%
6.2.14	45	3.61%
5.4.11	42	3.37%
5.3.13	35	2.81%
5.2.20	33	2.65%
6.1.20	32	2.57%
6.1.18	29	2.33%
6.2.10	28	2.25%
5.1.16	26	2.09%
6.0.9	25	2.00%
6.1.11	24	1.92%
6.1.2	22	1.76%
6.1.10	21	1.68%
5.2.3	20	1.60%
6.2.7	20	1.60%
6.2.9	19	1.52%
6.2.1	17	1.36%
6.1.12	17	1.36%
6.2.4	15	1.20%
6.1.14	15	1.20%
4.1.8	15	1.20%
6.1.15	14	1.12%
6.1.19	14	1.12%
4.2.10	14	1.12%
6.1.13	14	1.12%
6.1.5	13	1.04%
6.1.9	13	1.04%
6.2.11	13	1.04%
Other	418	33.52%
XMail (799 servers)
Version	Number of Servers	Percent
1.27	396	49.56%
1.22	249	31.16%
1.25	46	5.76%
1.26	45	5.63%
1.24	28	3.50%
1.21	8	1.00%
Other	27	3.38%
Qmail Toaster (726 servers)
Version	Number of Servers	Percent
1.3	562	77.41%
1.03	138	19.01%
1.03.5	11	1.52%
1.03.6	8	1.10%
Other	7	0.96%
SurgeSMTP (525 servers)
Version	Number of Servers	Percent
7.3o4-4	160	30.48%
7.3e2-2	67	12.76%
7.1e-1	33	6.29%
7.3i2-2	26	4.95%
6.5a2-2	25	4.76%
6.7c-1	18	3.43%
6.9c-1	17	3.24%
7.2i-1	16	3.05%
7.0c2-2	15	2.86%
7.2a-1	14	2.67%
3.9e-1	11	2.10%
6.5a-1	10	1.90%
7.2e-2	7	1.33%
4.0u4-4	7	1.33%
6.1c-1	6	1.14%
5.2a-1	6	1.14%
Other	87	16.57%
Lotus Domino (505 servers)
Version	Number of Servers	Percent
8.5.3FP6	104	20.59%
8.5.3	72	14.26%
8.5.2	26	5.15%
8.5	19	3.76%
8.5.1	19	3.76%
7.0.2	17	3.37%
8.5.3FP1	13	2.57%
8.5.3FP2	13	2.57%
8.5.3FP3	13	2.57%
7.0	12	2.38%
8.5.2FP2	11	2.18%
8.0.1	11	2.18%
7.0.3	9	1.78%
8.5.1FP5	8	1.58%
8.5.3FP4	8	1.58%
8.5.2FP4	8	1.58%
8.5.2FP3	8	1.58%
8.0	7	1.39%
8.0.2	6	1.19%
8.5.3FP5	6	1.19%
8.5.2FP4HF759	6	1.19%
7.0.3FP1	6	1.19%
Other	103	20.40%
WinWebMail (493 servers)
Version	Number of Servers	Percent
4.2.0.1	86	17.44%
3.9.0.7	74	15.01%
3.8.1.3	53	10.75%
3.9.0.1	37	7.51%
3.8.0.1	27	5.48%
3.7.6.1	24	4.87%
4.1.0.1	17	3.45%
4.0.0.1	17	3.45%
3.8.2.1	16	3.25%
3.8.1.5	16	3.25%
3.8.1.1	13	2.64%
3.9.2.1	13	2.64%
3.8.5.1	12	2.43%
3.7.3.1	10	2.03%
3.8.3.1	10	2.03%
3.9.3.1	9	1.83%
3.7.7.3	9	1.83%
3.8.6.1	8	1.62%
3.9.5.3	7	1.42%
3.7.1.1	5	1.01%
Other	30	6.09%
OpenSMTPD (381 servers)
Version	Number of Servers	Percent
Other	381	100.00%
Kerio (236 servers)
Version	Number of Servers	Percent
6.7.3	59	25.00%
6.7.0	31	13.14%
6.6.2	21	8.90%
6.7.2	21	8.90%
6.5.2	20	8.47%
6.5.0	11	4.66%
6.6.1	10	4.24%
6.4.1	9	3.81%
6.7.1	9	3.81%
6.3.1	9	3.81%
6.4.0	5	2.12%
6.6.0	5	2.12%
6.1.0	5	2.12%
6.3.0	3	1.27%
6.1.3	3	1.27%
5.7.9	3	1.27%
6.5.1	3	1.27%
Other	9	3.81%
MagicMail (178 servers)
Version	Number of Servers	Percent
Other	178	100.00%
Merak (157 servers)
Version	Number of Servers	Percent
8.0.3	39	24.84%
8.9.1	36	22.93%
8.5.0	10	6.37%
7.6.1	10	6.37%
7.4.5	9	5.73%
8.3.8	7	4.46%
9.0.3	7	4.46%
7.5.2	4	2.55%
7.6.4	4	2.55%
7.6.0	3	1.91%
7.0.1	3	1.91%
6.0.8	3	1.91%
7.4.2	2	1.27%
Other	20	12.74%
Post.Office (132 servers)
Version	Number of Servers	Percent
4.3	35	26.52%
4.2.2	25	18.94%
4.4	17	12.88%
4.1.2.4	13	9.85%
3.5.3	8	6.06%
4.2.1.3	4	3.03%
3.5.3J	4	3.03%
4.1.1	3	2.27%
4.2.1.1	3	2.27%
3.5.1	3	2.27%
3.9.2	2	1.52%
4.0.1	2	1.52%
3.8.7.4	2	1.52%
Other	11	8.33%
ArGoSoft (107 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	36	33.64%
1.8 (1.8.9.5)	16	14.95%
1.8 (1.8.9.3)	16	14.95%
1.8 (1.8.9.1)	7	6.54%
1.8 (1.8.7.3)	4	3.74%
1.8 (1.8.8.8)	3	2.80%
1.8 (1.8.7.6)	3	2.80%
1.8 (1.8.6.0)	3	2.80%
1.8 (1.8.8.9)	2	1.87%
1.8 (1.8.8.7)	2	1.87%
1.8 (1.8.8.4)	2	1.87%
1.8 (1.8.5.8)	2	1.87%
1.8 (1.8.9.2)	2	1.87%
Other	9	8.41%
GroupWise (75 servers)
Version	Number of Servers	Percent
18.1.1	11	14.67%
14.2.2	9	12.00%
18.0.2	7	9.33%
18.1.0	7	9.33%
14.2.3	6	8.00%
14.2.1	5	6.67%
14.2.0	4	5.33%
14.0.0	3	4.00%
18.0.1	3	4.00%
6.5.7	2	2.67%
18.0.0	2	2.67%
14.0.1	2	2.67%
8.0.3	2	2.67%
7.0.4	1	1.33%
6.5.0	1	1.33%
6.5.5	1	1.33%
12.0.1	1	1.33%
7.0.1	1	1.33%
6.5.6	1	1.33%
6.5.4	1	1.33%
6.5.2	1	1.33%
7.0.3	1	1.33%
7.0.2	1	1.33%
6.0.2	1	1.33%
6.0.4	1	1.33%
Other	0	0.00%
Gordano Messaging Suite (GMS) (69 servers)
Version	Number of Servers	Percent
Other	69	100.00%
Trend Micro (43 servers)
Version	Number of Servers	Percent
5.7	13	30.23%
5.18	11	25.58%
5.5	6	13.95%
7.0	5	11.63%
7.5	4	9.30%
7.5ready	1	2.33%
8	1	2.33%
9.0	1	2.33%
7.1	1	2.33%
Other	0	0.00%
OpenVMS (14 servers)
Version	Number of Servers	Percent
8.4	7	50.00%
7.3	4	28.57%
8.3	2	14.29%
8.2	1	7.14%
Other	0	0.00%
VisNetic (11 servers)
Version	Number of Servers	Percent
9.3.2.0	8	72.73%
8.0.3	1	9.09%
9.1.4.0	1	9.09%
5.5.8.3	1	9.09%
Other	0	0.00%
InterScan VirusWall (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
Mercury (6 servers)
Version	Number of Servers	Percent
3.32	3	50.00%
1.48	3	50.00%
Other	0	0.00%
Interscan (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_3013	1	25.00%
3.8-Build_1080	1	25.00%
Other	0	0.00%
Mirapoint (4 servers)
Version	Number of Servers	Percent
4.3.6-GA	1	25.00%
3.10.10a-GA	1	25.00%
4.4.5-GA	1	25.00%
4.4.6-GA	1	25.00%
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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%