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	967,660	100.0%
Number of Servers that didn't respond	173,203	17.90%
Server didn't open socket	171,057	17.68%
Server didn't provide banner	2,146	0.22%
Server provided banner	794,457	82.10%
Server banner identifies software in use	519,103	53.65%

As indicated by the above table, of the 967,660 servers queried, only 519,103 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	303,892	58.54%
Postfix	182,402	35.14%
Sendmail	17,142	3.30%
MailEnable	9,567	1.84%
MDaemon	2,162	0.42%
Microsoft	1,096	0.21%
CommuniGate Pro	663	0.13%
IMail	383	0.07%
OpenSMTPD	378	0.07%
XMail	360	0.07%
SurgeSMTP	270	0.05%
Qmail Toaster	175	0.03%
MagicMail	134	0.03%
Lotus Domino	114	0.02%
WinWebMail	97	0.02%
Kerio	58	0.01%
Merak	57	0.01%
Post.Office	53	0.01%
ArGoSoft	34	0.01%
GroupWise	31	0.01%
Gordano Messaging Suite (GMS)	12	0.00%
OpenVMS	9	0.00%
Trend Micro	5	0.00%
InterScan VirusWall	3	0.00%
VisNetic	2	0.00%
ModusMail	1	0.00%
MessageWall	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (303,892 servers)
Version	Number of Servers	Percent
4.96	227,001	74.70%
4.95	31,115	10.24%
4.94.2	12,172	4.01%
4.93	10,718	3.53%
4.92	4,113	1.35%
Other	18,773	6.18%
Postfix (182,402 servers)
Version	Number of Servers	Percent
Other	182,402	100.00%
Sendmail (17,142 servers)
Version	Number of Servers	Percent
8.16.1	5,634	32.87%
8.15.2	4,993	29.13%
8.14.7	1,812	10.57%
8.14.4	1,658	9.67%
8.13.8	781	4.56%
8.14.5	488	2.85%
8.17.1	368	2.15%
8.13.1	252	1.47%
8.14.9	246	1.44%
Other	910	5.31%
MailEnable (9,567 servers)
Version	Number of Servers	Percent
10.46--	3,658	38.24%
10.43--	562	5.87%
10.34--	547	5.72%
10.27--	334	3.49%
10.25--	296	3.09%
10.42--	187	1.95%
10.47--10.47	166	1.74%
9.00--	160	1.67%
10.43-10.43-	155	1.62%
10.47--	138	1.44%
10.45--	134	1.40%
10.47-10.47-	119	1.24%
9.00--9.00	103	1.08%
Other	3,008	31.44%
MDaemon (2,162 servers)
Version	Number of Servers	Percent
23.0.2	423	19.57%
13.5.1	111	5.13%
23.0.1	107	4.95%
19.5.4	79	3.65%
13.0.5	79	3.65%
13.0.4	72	3.33%
11.0.3	69	3.19%
11.0.0	66	3.05%
16.5.2	51	2.36%
14.5.2	48	2.22%
21.5.4	44	2.04%
22.0.3	43	1.99%
12.5.6	40	1.85%
21.5.2	37	1.71%
19.5.5	32	1.48%
12.5.4	24	1.11%
21.5.3	23	1.06%
23.0.0	22	1.02%
Other	792	36.63%
Microsoft (1,096 servers)
Version	Number of Servers	Percent
6.0.3790.4675	288	26.28%
10.0.17763.1697	168	15.33%
8.5.9600.16384	145	13.23%
10.0.14393.4169	128	11.68%
7.5.7601.17514	75	6.84%
6.0.3790.3959	62	5.66%
5.0.2195.5329	50	4.56%
8.0.9200.16384	27	2.46%
5.0.2195.6713	19	1.73%
7.0.6002.18264	13	1.19%
10.0.14393.0	13	1.19%
6.0.3790.1830	13	1.19%
10.0.20348.1	11	1.00%
10.0.17763.1	11	1.00%
Other	73	6.66%
CommuniGate Pro (663 servers)
Version	Number of Servers	Percent
6.2.15	70	10.56%
6.2.14	52	7.84%
6.3.17	36	5.43%
6.4.0	24	3.62%
6.3.18	22	3.32%
6.1.20	20	3.02%
6.3.19	17	2.56%
6.3.20	17	2.56%
5.4.11	12	1.81%
6.0.9	12	1.81%
6.4.1	12	1.81%
6.0.11	11	1.66%
6.3.14	10	1.51%
6.3.15	10	1.51%
6.1.18	10	1.51%
6.1.16	9	1.36%
5.2.20	9	1.36%
5.1.16	9	1.36%
6.3.16	9	1.36%
7.1.4	8	1.21%
6.2.16	8	1.21%
7.1.1	7	1.06%
6.1.19	7	1.06%
6.2.12	7	1.06%
Other	255	38.46%
IMail (383 servers)
Version	Number of Servers	Percent
12.5.6.101	31	8.09%
12.5.8.41	31	8.09%
9.23	28	7.31%
12.5.7.59	23	6.01%
12.6.0.17	21	5.48%
12.5.8.58	21	5.48%
12.5.8.59	21	5.48%
12.5.8.54	20	5.22%
12.5.3.93	17	4.44%
8.22	16	4.18%
12.4.1.15	16	4.18%
8.05	15	3.92%
12.5.5.115	15	3.92%
12.5.6.105	12	3.13%
12.3.0.100	10	2.61%
12.6.0.19	9	2.35%
12.5.4.146	8	2.09%
12.6.0.20	6	1.57%
8.00	5	1.31%
11.5	5	1.31%
10.02	4	1.04%
7.07	4	1.04%
8.15	4	1.04%
Other	41	10.70%
OpenSMTPD (378 servers)
Version	Number of Servers	Percent
Other	378	100.00%
XMail (360 servers)
Version	Number of Servers	Percent
1.27	220	61.11%
1.22	91	25.28%
1.25	16	4.44%
1.26	13	3.61%
1.24	7	1.94%
1.15	6	1.67%
Other	7	1.94%
SurgeSMTP (270 servers)
Version	Number of Servers	Percent
7.7c-1	55	20.37%
7.6j-1	23	8.52%
7.3o4-4	19	7.04%
7.6u-1	18	6.67%
7.5c-1	15	5.56%
7.3e2-2	14	5.19%
7.7g-1	12	4.44%
7.5a-1	8	2.96%
6.9c-1	8	2.96%
7.6h-2	8	2.96%
7.4e-1	8	2.96%
7.1e-1	7	2.59%
6.5a2-2	7	2.59%
7.6s-1	6	2.22%
7.4o-1	6	2.22%
7.6d-1	6	2.22%
7.3i2-2	4	1.48%
6.7c-1	4	1.48%
Other	42	15.56%
Qmail Toaster (175 servers)
Version	Number of Servers	Percent
1.03	94	53.71%
1.3	76	43.43%
1.03.5	3	1.71%
Other	2	1.14%
MagicMail (134 servers)
Version	Number of Servers	Percent
Other	134	100.00%
Lotus Domino (114 servers)
Version	Number of Servers	Percent
8.5.3	18	15.79%
8.5.3FP6	13	11.40%
8.5.1	7	6.14%
7.0	6	5.26%
7.0.3	5	4.39%
7.0.2	5	4.39%
6.5	4	3.51%
8.5.2FP1	4	3.51%
8.5	4	3.51%
6.5.1	3	2.63%
8.5.2FP2	3	2.63%
8.5.3FP3	3	2.63%
8.0.1	3	2.63%
8.5.3FP1	2	1.75%
8.0	2	1.75%
6.5.4	2	1.75%
8.5.2	2	1.75%
8.5.1FP5	2	1.75%
8.5.3FP5	2	1.75%
6.5.3	2	1.75%
7.0.4FP2	2	1.75%
7.0.3FP1	2	1.75%
Other	18	15.79%
WinWebMail (97 servers)
Version	Number of Servers	Percent
4.4.0.1	20	20.62%
4.2.0.1	12	12.37%
3.9.0.7	11	11.34%
3.8.1.3	7	7.22%
3.8.6.1	6	6.19%
4.5.0.1	5	5.15%
4.3.0.1	5	5.15%
3.7.3.1	4	4.12%
4.1.0.1	4	4.12%
3.8.0.1	3	3.09%
4.0.0.1	3	3.09%
3.8.1.1	2	2.06%
3.8.3.1	1	1.03%
1.0	1	1.03%
3.7.6.1	1	1.03%
3.8.5.1	1	1.03%
3.9.3.1	1	1.03%
3.8.2.1	1	1.03%
3.7.0.3	1	1.03%
3.9.5.3	1	1.03%
3.7.1.1	1	1.03%
3.9.2.1	1	1.03%
3.7.7.3	1	1.03%
3.9.0.1	1	1.03%
3.8.1.5	1	1.03%
3.8.1.6	1	1.03%
3.7.5.1	1	1.03%
Other	0	0.00%
Kerio (58 servers)
Version	Number of Servers	Percent
6.7.3	10	17.24%
6.6.1	8	13.79%
6.6.2	7	12.07%
6.7.0	7	12.07%
6.7.1	5	8.62%
6.5.2	4	6.90%
6.5.0	3	5.17%
5.7.9	2	3.45%
6.4.1	2	3.45%
6.5.1	2	3.45%
6.0.10	1	1.72%
6.0.3	1	1.72%
6.3.1	1	1.72%
6.0.8	1	1.72%
6.7.2	1	1.72%
5.7.6	1	1.72%
6.6.0	1	1.72%
6.3.0	1	1.72%
Other	0	0.00%
Merak (57 servers)
Version	Number of Servers	Percent
8.0.3	17	29.82%
8.9.1	15	26.32%
7.6.1	7	12.28%
7.4.5	3	5.26%
8.3.8	3	5.26%
7.6.4	2	3.51%
8.0.1	1	1.75%
8.9.2	1	1.75%
6.1.0	1	1.75%
9.0.3	1	1.75%
8.5.0	1	1.75%
4.2.1	1	1.75%
7.4.4	1	1.75%
6.0.8	1	1.75%
7.0.1	1	1.75%
5.8.2	1	1.75%
Other	0	0.00%
Post.Office (53 servers)
Version	Number of Servers	Percent
4.4	19	35.85%
4.2.2	10	18.87%
4.3	8	15.09%
3.5.3	5	9.43%
4.1.2.4	3	5.66%
3.9.2	2	3.77%
4.2	1	1.89%
3.5.1	1	1.89%
4.2.1.3	1	1.89%
4.1	1	1.89%
3.1.2	1	1.89%
4.2.1.1	1	1.89%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	10	29.41%
1.8 (1.8.9.5)	5	14.71%
1.8 (1.8.9.3)	4	11.76%
1.8 (1.8.9.1)	3	8.82%
1.8 (1.8.8.8)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.2)	2	5.88%
1.8 (1.8.6.1)	1	2.94%
1.8 (1.8.7.3)	1	2.94%
1.8 (1.8.7.6)	1	2.94%
1.8 (1.8.8.4)	1	2.94%
1.8 (1.8.6.0)	1	2.94%
1.8 (1.8.8.9)	1	2.94%
Other	0	0.00%
GroupWise (31 servers)
Version	Number of Servers	Percent
18.3.1	7	22.58%
18.2.1	5	16.13%
18.4.2	3	9.68%
18.5.0	3	9.68%
18.2.0	2	6.45%
14.2.2	2	6.45%
14.2.1	1	3.23%
18.1.1	1	3.23%
14.2.3	1	3.23%
18.0.0	1	3.23%
6.5.0	1	3.23%
18.4.1	1	3.23%
18.1.0	1	3.23%
14.0.0	1	3.23%
18.0.2	1	3.23%
Other	0	0.00%
Gordano Messaging Suite (GMS) (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
OpenVMS (9 servers)
Version	Number of Servers	Percent
8.4	5	55.56%
7.3	3	33.33%
8.2	1	11.11%
Other	0	0.00%
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%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
VisNetic (2 servers)
Version	Number of Servers	Percent
8.0.3	1	50.00%
9.3.2.0	1	50.00%
Other	0	0.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	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%