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	834,663	100.0%
Number of Servers that didn't respond	149,694	17.93%
Server didn't open socket	147,857	17.71%
Server didn't provide banner	1,837	0.22%
Server provided banner	684,969	82.07%
Server banner identifies software in use	465,188	55.73%

As indicated by the above table, of the 834,663 servers queried, only 465,188 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	274,619	59.03%
Postfix	160,354	34.47%
Sendmail	16,103	3.46%
MailEnable	8,673	1.86%
MDaemon	1,970	0.42%
Microsoft	965	0.21%
CommuniGate Pro	576	0.12%
IMail	344	0.07%
XMail	323	0.07%
OpenSMTPD	304	0.07%
SurgeSMTP	238	0.05%
Qmail Toaster	174	0.04%
MagicMail	120	0.03%
Lotus Domino	91	0.02%
WinWebMail	87	0.02%
Merak	55	0.01%
Kerio	52	0.01%
Post.Office	51	0.01%
ArGoSoft	34	0.01%
GroupWise	25	0.01%
Gordano Messaging Suite (GMS)	11	0.00%
OpenVMS	6	0.00%
Trend Micro	4	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Mercury	1	0.00%
Mirapoint	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (274,619 servers)
Version	Number of Servers	Percent
4.96	150,990	54.98%
4.95	78,875	28.72%
4.94.2	12,329	4.49%
4.93	9,999	3.64%
4.92	3,826	1.39%
Other	18,600	6.77%
Postfix (160,354 servers)
Version	Number of Servers	Percent
Other	160,354	100.00%
Sendmail (16,103 servers)
Version	Number of Servers	Percent
8.16.1	5,312	32.99%
8.15.2	4,663	28.96%
8.14.7	1,848	11.48%
8.14.4	1,574	9.77%
8.13.8	737	4.58%
8.14.5	439	2.73%
8.17.1	361	2.24%
8.14.9	237	1.47%
8.13.1	217	1.35%
Other	715	4.44%
MailEnable (8,673 servers)
Version	Number of Servers	Percent
10.43--	3,454	39.82%
10.34--	598	6.89%
10.27--	354	4.08%
10.42--	305	3.52%
10.25--	278	3.21%
10.43-10.43-	197	2.27%
10.45--	173	1.99%
9.00--	147	1.69%
10.45--10.45	143	1.65%
10.43--10.43	128	1.48%
9.00--9.00	98	1.13%
10.45-10.45-	96	1.11%
10.31--	96	1.11%
Other	2,606	30.05%
MDaemon (1,970 servers)
Version	Number of Servers	Percent
23.0.1	277	14.06%
13.5.1	105	5.33%
22.0.3	93	4.72%
23.0.0	93	4.72%
13.0.5	77	3.91%
11.0.0	70	3.55%
13.0.4	69	3.50%
21.5.2	69	3.50%
11.0.3	68	3.45%
19.5.4	54	2.74%
16.5.2	44	2.23%
14.5.2	42	2.13%
21.5.3	41	2.08%
12.5.6	34	1.73%
19.5.5	29	1.47%
10.0.0	23	1.17%
21.0.3	22	1.12%
12.5.4	22	1.12%
22.0.2	20	1.02%
Other	718	36.45%
Microsoft (965 servers)
Version	Number of Servers	Percent
6.0.3790.4675	262	27.15%
8.5.9600.16384	134	13.89%
10.0.17763.1697	128	13.26%
10.0.14393.4169	127	13.16%
7.5.7601.17514	64	6.63%
6.0.3790.3959	50	5.18%
5.0.2195.5329	45	4.66%
8.0.9200.16384	21	2.18%
5.0.2195.6713	19	1.97%
7.0.6002.18264	15	1.55%
10.0.17763.1	12	1.24%
10.0.14393.0	10	1.04%
Other	78	8.08%
CommuniGate Pro (576 servers)
Version	Number of Servers	Percent
6.2.15	55	9.55%
6.2.14	49	8.51%
6.3.17	39	6.77%
6.3.18	34	5.90%
6.1.20	23	3.99%
5.4.11	13	2.26%
6.0.9	13	2.26%
6.3.14	12	2.08%
6.1.16	12	2.08%
6.0.11	11	1.91%
6.1.18	11	1.91%
6.3.15	10	1.74%
5.2.20	10	1.74%
6.3.16	9	1.56%
6.3.6	9	1.56%
7.1.4	8	1.39%
6.2.12	7	1.22%
5.1.16	7	1.22%
6.3.5	6	1.04%
6.3.13	6	1.04%
Other	232	40.28%
IMail (344 servers)
Version	Number of Servers	Percent
12.5.8.41	35	10.17%
12.5.6.101	33	9.59%
12.5.7.59	30	8.72%
9.23	24	6.98%
12.6.0.17	24	6.98%
12.5.8.58	20	5.81%
12.5.8.59	19	5.52%
8.05	16	4.65%
12.5.3.93	15	4.36%
12.5.6.105	14	4.07%
8.22	13	3.78%
12.4.1.15	13	3.78%
12.5.8.54	12	3.49%
12.3.0.100	9	2.62%
8.15	8	2.33%
12.5.4.146	6	1.74%
12.6.0.19	6	1.74%
12.5.5.115	5	1.45%
12.5.5.117	4	1.16%
11.5	4	1.16%
Other	34	9.88%
XMail (323 servers)
Version	Number of Servers	Percent
1.27	195	60.37%
1.22	82	25.39%
1.25	13	4.02%
1.26	12	3.72%
1.24	7	2.17%
1.15	6	1.86%
Other	8	2.48%
OpenSMTPD (304 servers)
Version	Number of Servers	Percent
Other	304	100.00%
SurgeSMTP (238 servers)
Version	Number of Servers	Percent
7.7c-1	38	15.97%
7.3o4-4	21	8.82%
7.6j-1	20	8.40%
7.6u-1	20	8.40%
7.5c-1	14	5.88%
7.3e2-2	14	5.88%
7.1e-1	8	3.36%
7.6h-2	8	3.36%
7.5a-1	7	2.94%
6.9c-1	7	2.94%
7.6d-1	7	2.94%
7.4o-1	6	2.52%
7.6s-1	5	2.10%
7.4e-1	5	2.10%
6.5a2-2	4	1.68%
6.7c-1	4	1.68%
7.3i2-2	3	1.26%
7.6q-1	3	1.26%
3.9e-1	3	1.26%
7.2i-1	3	1.26%
Other	38	15.97%
Qmail Toaster (174 servers)
Version	Number of Servers	Percent
1.03	91	52.30%
1.3	74	42.53%
1.03.5	6	3.45%
1.03.6	2	1.15%
Other	1	0.57%
MagicMail (120 servers)
Version	Number of Servers	Percent
Other	120	100.00%
Lotus Domino (91 servers)
Version	Number of Servers	Percent
8.5.3	19	20.88%
8.5.3FP6	16	17.58%
7.0	5	5.49%
7.0.3	5	5.49%
6.5	3	3.30%
8.5.2FP2	3	3.30%
8.5.1	3	3.30%
7.0.2	3	3.30%
8.5.3FP5	2	2.20%
8.5.2FP1	2	2.20%
8.5.3FP1	2	2.20%
8.0	2	2.20%
6.5.1	2	2.20%
8.5.2FP4	2	2.20%
8.5.1FP5	2	2.20%
8.5.2	2	2.20%
8.5.3FP4	2	2.20%
8.5.2FP3	2	2.20%
8.0.1	2	2.20%
6.5.3	2	2.20%
8.5.3FP6HF1215	1	1.10%
6.5.4	1	1.10%
6.0.1	1	1.10%
5.0.8	1	1.10%
7.5.1	1	1.10%
7.0.4FP1	1	1.10%
5.0.11	1	1.10%
6.5.2	1	1.10%
7.0.3FP1	1	1.10%
7.0.4FP2	1	1.10%
Other	0	0.00%
WinWebMail (87 servers)
Version	Number of Servers	Percent
4.4.0.1	17	19.54%
4.2.0.1	15	17.24%
3.9.0.7	13	14.94%
4.3.0.1	7	8.05%
3.8.1.3	6	6.90%
3.7.3.1	4	4.60%
3.8.6.1	4	4.60%
4.1.0.1	3	3.45%
3.8.0.1	3	3.45%
3.7.7.3	2	2.30%
3.8.1.5	2	2.30%
3.8.3.1	1	1.15%
1.0	1	1.15%
3.7.6.1	1	1.15%
3.9.3.1	1	1.15%
4.5.0.1	1	1.15%
3.8.5.1	1	1.15%
3.9.2.1	1	1.15%
3.9.0.1	1	1.15%
3.8.1.6	1	1.15%
4.0.0.1	1	1.15%
3.7.5.1	1	1.15%
Other	0	0.00%
Merak (55 servers)
Version	Number of Servers	Percent
8.0.3	15	27.27%
8.9.1	14	25.45%
7.6.1	7	12.73%
8.3.8	5	9.09%
7.4.5	2	3.64%
8.0.1	1	1.82%
8.9.2	1	1.82%
8.3.6	1	1.82%
6.1.0	1	1.82%
9.0.3	1	1.82%
8.5.0	1	1.82%
4.2.1	1	1.82%
7.6.0	1	1.82%
7.4.4	1	1.82%
6.0.8	1	1.82%
7.0.1	1	1.82%
5.8.2	1	1.82%
Other	0	0.00%
Kerio (52 servers)
Version	Number of Servers	Percent
6.7.3	10	19.23%
6.6.1	8	15.38%
6.7.0	6	11.54%
6.6.2	6	11.54%
6.7.1	5	9.62%
6.5.2	5	9.62%
5.7.9	2	3.85%
6.4.1	2	3.85%
6.7.2	2	3.85%
6.5.1	2	3.85%
6.0.10	1	1.92%
6.3.1	1	1.92%
6.0.8	1	1.92%
6.5.0	1	1.92%
Other	0	0.00%
Post.Office (51 servers)
Version	Number of Servers	Percent
4.4	21	41.18%
4.2.2	10	19.61%
4.3	8	15.69%
3.5.3	3	5.88%
3.9.2	2	3.92%
4.2	2	3.92%
4.1.2.4	2	3.92%
4.1	1	1.96%
3.1.2	1	1.96%
4.2.1.1	1	1.96%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	41.18%
1.8 (1.8.9.3)	4	11.76%
1.8 (1.8.9.5)	3	8.82%
1.8 (1.8.8.8)	2	5.88%
1.8 (1.8.7.3)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.2)	2	5.88%
1.8 (1.8.8.9)	1	2.94%
1.8 (1.8.8.4)	1	2.94%
1.8 (1.8.6.0)	1	2.94%
1.8 (1.8.9.1)	1	2.94%
1.8 (1.8.9.4)	1	2.94%
Other	0	0.00%
GroupWise (25 servers)
Version	Number of Servers	Percent
18.4.2	4	16.00%
18.3.1	4	16.00%
18.2.1	3	12.00%
18.1.1	2	8.00%
14.2.2	2	8.00%
6.5.7	1	4.00%
14.2.1	1	4.00%
14.2.3	1	4.00%
18.0.0	1	4.00%
6.5.0	1	4.00%
18.4.1	1	4.00%
8.0.3	1	4.00%
14.0.0	1	4.00%
18.0.2	1	4.00%
18.4.0	1	4.00%
Other	0	0.00%
Gordano Messaging Suite (GMS) (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	3	50.00%
7.3	2	33.33%
8.2	1	16.67%
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%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%