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	852,563	100.0%
Number of Servers that didn't respond	136,435	16.00%
Server didn't open socket	134,247	15.75%
Server didn't provide banner	2,188	0.26%
Server provided banner	716,128	84.00%
Server banner identifies software in use	475,846	55.81%

As indicated by the above table, of the 852,563 servers queried, only 475,846 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	288,279	60.58%
Postfix	155,238	32.62%
Sendmail	16,894	3.55%
MailEnable	9,368	1.97%
MDaemon	2,214	0.47%
Microsoft	1,089	0.23%
CommuniGate Pro	565	0.12%
IMail	405	0.09%
Qmail Toaster	395	0.08%
XMail	334	0.07%
OpenSMTPD	262	0.06%
SurgeSMTP	244	0.05%
Lotus Domino	108	0.02%
MagicMail	104	0.02%
WinWebMail	78	0.02%
Merak	58	0.01%
Post.Office	56	0.01%
Kerio	55	0.01%
ArGoSoft	33	0.01%
GroupWise	27	0.01%
Gordano Messaging Suite (GMS)	13	0.00%
Trend Micro	8	0.00%
OpenVMS	5	0.00%
VisNetic	5	0.00%
ModusMail	2	0.00%
Neon Mail Server	1	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
WebSTAR V	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (288,279 servers)
Version	Number of Servers	Percent
4.94.2	174,908	60.67%
4.95	61,199	21.23%
4.93	19,379	6.72%
4.92	4,876	1.69%
4.94	4,718	1.64%
4.91	3,473	1.20%
Other	19,726	6.84%
Postfix (155,238 servers)
Version	Number of Servers	Percent
Other	155,238	100.00%
Sendmail (16,894 servers)
Version	Number of Servers	Percent
8.15.2	9,437	55.86%
8.14.4	1,915	11.34%
8.14.7	1,876	11.10%
8.13.8	903	5.35%
8.14.5	863	5.11%
8.16.1	423	2.50%
8.14.9	278	1.65%
8.13.1	268	1.59%
8.17.1	170	1.01%
Other	761	4.50%
MailEnable (9,368 servers)
Version	Number of Servers	Percent
10.34--	3,830	40.88%
10.27--	596	6.36%
10.25--	465	4.96%
10.37--	260	2.78%
9.00--	250	2.67%
10.31--	144	1.54%
10.37--10.37	132	1.41%
10.31-10.31-	131	1.40%
10.37-10.37-	121	1.29%
9.00--9.00	109	1.16%
10.38--	101	1.08%
9.16--	98	1.05%
Other	3,131	33.42%
MDaemon (2,214 servers)
Version	Number of Servers	Percent
21.5.2	298	13.46%
13.5.1	148	6.68%
21.5.1	100	4.52%
13.0.5	88	3.97%
11.0.0	84	3.79%
13.0.4	81	3.66%
11.0.3	80	3.61%
21.0.3	62	2.80%
16.5.2	59	2.66%
19.5.5	57	2.57%
14.5.2	48	2.17%
19.5.4	48	2.17%
21.0.2	45	2.03%
12.5.6	42	1.90%
21.0.1	41	1.85%
21.5.0	40	1.81%
10.1.2	27	1.22%
10.0.0	26	1.17%
12.5.4	25	1.13%
20.0.4	23	1.04%
Other	792	35.77%
Microsoft (1,089 servers)
Version	Number of Servers	Percent
6.0.3790.4675	354	32.51%
8.5.9600.16384	172	15.79%
10.0.14393.4169	114	10.47%
7.5.7601.17514	88	8.08%
10.0.17763.1697	85	7.81%
5.0.2195.5329	55	5.05%
6.0.3790.3959	55	5.05%
8.0.9200.16384	27	2.48%
5.0.2195.6713	20	1.84%
6.0.3790.1830	14	1.29%
10.0.14393.2608	13	1.19%
10.0.17763.1	12	1.10%
Other	80	7.35%
CommuniGate Pro (565 servers)
Version	Number of Servers	Percent
6.2.15	73	12.92%
6.2.14	54	9.56%
6.1.20	24	4.25%
6.0.11	17	3.01%
7.1.1	16	2.83%
6.1.16	16	2.83%
6.3.10	15	2.65%
6.1.18	15	2.65%
6.2.12	14	2.48%
5.2.20	14	2.48%
5.4.11	13	2.30%
6.0.9	12	2.12%
6.3.6	10	1.77%
6.2.16	9	1.59%
6.3.9	9	1.59%
6.3.5	7	1.24%
6.2.10	7	1.24%
6.3.3	6	1.06%
6.0.7	6	1.06%
6.2.7	6	1.06%
6.3.4	6	1.06%
Other	216	38.23%
IMail (405 servers)
Version	Number of Servers	Percent
12.5.8.41	62	15.31%
12.5.6.101	39	9.63%
12.5.7.59	32	7.90%
12.5.8.58	28	6.91%
12.4.1.15	26	6.42%
9.23	25	6.17%
12.5.6.105	19	4.69%
12.5.3.93	17	4.20%
8.05	17	4.20%
12.3.0.100	16	3.95%
8.22	15	3.70%
12.5.8.54	14	3.46%
12.5.5.115	13	3.21%
8.15	13	3.21%
10.02	12	2.96%
12.5.5.117	8	1.98%
12.5.4.146	6	1.48%
Other	43	10.62%
Qmail Toaster (395 servers)
Version	Number of Servers	Percent
1.3	297	75.19%
1.03	89	22.53%
1.03.5	6	1.52%
Other	3	0.76%
XMail (334 servers)
Version	Number of Servers	Percent
1.27	179	53.59%
1.22	101	30.24%
1.26	17	5.09%
1.25	14	4.19%
1.24	9	2.69%
1.15	5	1.50%
Other	9	2.69%
OpenSMTPD (262 servers)
Version	Number of Servers	Percent
Other	262	100.00%
SurgeSMTP (244 servers)
Version	Number of Servers	Percent
7.3o4-4	31	12.70%
7.6j-1	25	10.25%
7.5c-1	21	8.61%
7.6h-2	17	6.97%
7.5a-1	16	6.56%
7.3e2-2	16	6.56%
7.1e-1	10	4.10%
7.4o-1	10	4.10%
7.6d-1	8	3.28%
7.4e-1	8	3.28%
7.6m-1	7	2.87%
6.7c-1	7	2.87%
6.5a2-2	5	2.05%
7.3i2-2	4	1.64%
3.9e-1	4	1.64%
6.9c-1	3	1.23%
7.2a-1	3	1.23%
Other	49	20.08%
Lotus Domino (108 servers)
Version	Number of Servers	Percent
8.5.3	21	19.44%
8.5.3FP6	20	18.52%
7.0	7	6.48%
8.5.2FP2	6	5.56%
7.0.3	5	4.63%
8.5.1	4	3.70%
7.0.2	4	3.70%
8.5.2	3	2.78%
5.0.8	3	2.78%
6.5	2	1.85%
8.5.3FP5	2	1.85%
8.5.2FP1	2	1.85%
8.5.3FP1	2	1.85%
8.0	2	1.85%
8.5.1FP5	2	1.85%
8.5.3FP4	2	1.85%
8.5.2FP3	2	1.85%
7.0.3FP1	2	1.85%
8.0.1	2	1.85%
6.5.3	2	1.85%
Other	13	12.04%
MagicMail (104 servers)
Version	Number of Servers	Percent
Other	104	100.00%
WinWebMail (78 servers)
Version	Number of Servers	Percent
4.2.0.1	18	23.08%
3.9.0.7	13	16.67%
4.4.0.1	8	10.26%
3.8.1.3	5	6.41%
4.3.0.1	5	6.41%
3.8.6.1	5	6.41%
4.1.0.1	3	3.85%
3.7.3.1	3	3.85%
3.7.6.1	3	3.85%
1.0	2	2.56%
3.8.0.1	2	2.56%
4.0.0.1	2	2.56%
3.8.1.5	2	2.56%
3.7.5.1	2	2.56%
3.8.5.1	1	1.28%
3.7.6.2	1	1.28%
3.9.0.1	1	1.28%
3.8.1.1	1	1.28%
3.9.2.2	1	1.28%
Other	0	0.00%
Merak (58 servers)
Version	Number of Servers	Percent
8.0.3	16	27.59%
8.9.1	12	20.69%
7.6.1	7	12.07%
8.3.8	4	6.90%
8.5.0	3	5.17%
7.4.5	3	5.17%
9.0.3	2	3.45%
7.6.0	2	3.45%
8.9.2	1	1.72%
8.3.6	1	1.72%
6.1.0	1	1.72%
4.4.2	1	1.72%
8.9.7	1	1.72%
7.4.4	1	1.72%
6.0.8	1	1.72%
7.0.1	1	1.72%
8.9.0	1	1.72%
Other	0	0.00%
Post.Office (56 servers)
Version	Number of Servers	Percent
4.4	17	30.36%
4.3	11	19.64%
4.2.2	11	19.64%
4.1.2.4	5	8.93%
3.5.3	3	5.36%
3.9.2	2	3.57%
4.2	1	1.79%
4.1.1	1	1.79%
3.5.3J	1	1.79%
4.0.1	1	1.79%
4.1.0.3	1	1.79%
4.1	1	1.79%
3.1.2	1	1.79%
Other	0	0.00%
Kerio (55 servers)
Version	Number of Servers	Percent
6.7.3	14	25.45%
6.7.0	8	14.55%
6.6.1	6	10.91%
6.6.2	6	10.91%
6.5.2	5	9.09%
6.7.1	4	7.27%
6.5.0	3	5.45%
6.7.2	2	3.64%
6.5.1	2	3.64%
6.0.10	1	1.82%
5.7.9	1	1.82%
6.3.1	1	1.82%
6.0.8	1	1.82%
6.6.0	1	1.82%
Other	0	0.00%
ArGoSoft (33 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	7	21.21%
1.8 (1.8.9.5)	4	12.12%
1.8 (1.8.8.8)	3	9.09%
1.8 (1.8.9.3)	3	9.09%
1.8 (1.8.7.3)	2	6.06%
1.8 (1.8.9.1)	2	6.06%
1.8 (1.8.9.2)	2	6.06%
1.8 (1.8.2.1)	2	6.06%
1.8 (1.8.6.1)	1	3.03%
1.8 (1.8.8.9)	1	3.03%
1.8 (1.8.8.7)	1	3.03%
1.8 (1.8.7.6)	1	3.03%
1.8 (1.8.5.8)	1	3.03%
1.8 (1.8.8.4)	1	3.03%
1.8 (1.8.9.4)	1	3.03%
1.8 (1.8.2.5)	1	3.03%
Other	0	0.00%
GroupWise (27 servers)
Version	Number of Servers	Percent
18.3.1	7	25.93%
18.1.1	3	11.11%
18.4.0	3	11.11%
18.2.1	3	11.11%
14.2.1	2	7.41%
18.0.0	1	3.70%
6.5.0	1	3.70%
8.0.3	1	3.70%
14.2.0	1	3.70%
14.2.2	1	3.70%
14.0.0	1	3.70%
18.2.0	1	3.70%
14.2.3	1	3.70%
18.0.2	1	3.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
Trend Micro (8 servers)
Version	Number of Servers	Percent
5.18	4	50.00%
5.7	3	37.50%
7.5ready	1	12.50%
Other	0	0.00%
OpenVMS (5 servers)
Version	Number of Servers	Percent
8.4	2	40.00%
7.3	2	40.00%
8.2	1	20.00%
Other	0	0.00%
VisNetic (5 servers)
Version	Number of Servers	Percent
9.3.2.0	3	60.00%
8.0.3	1	20.00%
5.0.1	1	20.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	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%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	100.00%
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%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%