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	1,011,851	100.0%
Number of Servers that didn't respond	157,126	15.53%
Server didn't open socket	152,653	15.09%
Server didn't provide banner	4,473	0.44%
Server provided banner	854,725	84.47%
Server banner identifies software in use	552,278	54.58%

As indicated by the above table, of the 1,011,851 servers queried, only 552,278 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	332,908	60.28%
Postfix	179,315	32.47%
Sendmail	20,133	3.65%
MailEnable	11,391	2.06%
MDaemon	3,306	0.60%
Microsoft	1,690	0.31%
CommuniGate Pro	729	0.13%
IMail	562	0.10%
Qmail Toaster	452	0.08%
XMail	424	0.08%
SurgeSMTP	293	0.05%
OpenSMTPD	255	0.05%
Lotus Domino	190	0.03%
WinWebMail	126	0.02%
MagicMail	111	0.02%
Merak	89	0.02%
Kerio	88	0.02%
Post.Office	68	0.01%
ArGoSoft	48	0.01%
GroupWise	44	0.01%
Gordano Messaging Suite (GMS)	18	0.00%
Trend Micro	13	0.00%
OpenVMS	8	0.00%
VisNetic	6	0.00%
InterScan VirusWall	3	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
Mercury	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (332,908 servers)
Version	Number of Servers	Percent
4.93	252,513	75.85%
4.94	19,967	6.00%
4.91	13,480	4.05%
4.92	9,048	2.72%
4.92.3	6,638	1.99%
4.89	4,626	1.39%
4.93.0.4	4,366	1.31%
4.87	3,876	1.16%
4.84	3,659	1.10%
Other	14,735	4.43%
Postfix (179,315 servers)
Version	Number of Servers	Percent
Other	179,315	100.00%
Sendmail (20,133 servers)
Version	Number of Servers	Percent
8.15.2	10,110	50.22%
8.14.4	2,949	14.65%
8.14.7	1,949	9.68%
8.13.8	1,396	6.93%
8.14.5	1,266	6.29%
8.14.9	604	3.00%
8.13.1	395	1.96%
8.16.1	288	1.43%
8.14.3	277	1.38%
Other	899	4.47%
MailEnable (11,391 servers)
Version	Number of Servers	Percent
10.27--	3,099	27.21%
10.25--	2,191	19.23%
9.00--	404	3.55%
10.31--	347	3.05%
10.31-10.31-	254	2.23%
10.29--	237	2.08%
10.31--10.31	209	1.83%
10.30--	193	1.69%
9.16--	164	1.44%
10.12--	150	1.32%
9.00--9.00	126	1.11%
8.60--	125	1.10%
Other	3,892	34.17%
MDaemon (3,306 servers)
Version	Number of Servers	Percent
20.0.3	462	13.97%
19.5.5	270	8.17%
13.5.1	217	6.56%
13.0.5	143	4.33%
13.0.4	131	3.96%
11.0.3	124	3.75%
11.0.0	120	3.63%
13.6.3	99	2.99%
16.5.2	94	2.84%
14.5.2	75	2.27%
12.5.6	72	2.18%
12.5.4	62	1.88%
19.5.4	45	1.36%
20.0.2	44	1.33%
10.0.0	40	1.21%
15.0.3	37	1.12%
10.1.2	34	1.03%
16.0.4	34	1.03%
Other	1,203	36.39%
Microsoft (1,690 servers)
Version	Number of Servers	Percent
6.0.3790.4675	639	37.81%
8.5.9600.16384	266	15.74%
7.5.7601.17514	167	9.88%
10.0.14393.2608	158	9.35%
6.0.3790.3959	96	5.68%
10.0.17763.1	81	4.79%
5.0.2195.5329	70	4.14%
8.0.9200.16384	38	2.25%
6.0.3790.1830	26	1.54%
5.0.2195.6713	26	1.54%
5.0.2195.7381	18	1.07%
7.0.6002.18264	17	1.01%
Other	88	5.21%
CommuniGate Pro (729 servers)
Version	Number of Servers	Percent
6.2.14	76	10.43%
6.2.15	63	8.64%
6.1.20	41	5.62%
6.2.12	26	3.57%
6.0.11	23	3.16%
5.3.13	23	3.16%
6.1.16	22	3.02%
6.1.18	20	2.74%
5.2.20	19	2.61%
5.4.11	18	2.47%
5.1.16	18	2.47%
6.3.3	16	2.19%
6.2.13	13	1.78%
6.0.9	13	1.78%
6.3.4	10	1.37%
6.2.10	10	1.37%
6.0.7	9	1.23%
6.1.9	8	1.10%
6.2.9	8	1.10%
Other	293	40.19%
IMail (562 servers)
Version	Number of Servers	Percent
12.5.8.41	91	16.19%
12.5.7.59	67	11.92%
12.5.6.101	59	10.50%
12.4.1.15	47	8.36%
9.23	33	5.87%
8.22	29	5.16%
8.05	24	4.27%
12.3.0.100	23	4.09%
12.5.3.93	22	3.91%
12.5.5.115	22	3.91%
8.15	21	3.74%
12.5.6.105	16	2.85%
10.02	12	2.14%
12.5.4.146	10	1.78%
12.5.5.117	10	1.78%
11.5	8	1.42%
7.07	7	1.25%
12.5.7.58	6	1.07%
7.15	6	1.07%
Other	49	8.72%
Qmail Toaster (452 servers)
Version	Number of Servers	Percent
1.3	341	75.44%
1.03	97	21.46%
1.03.5	7	1.55%
Other	7	1.55%
XMail (424 servers)
Version	Number of Servers	Percent
1.27	221	52.12%
1.22	140	33.02%
1.26	20	4.72%
1.25	17	4.01%
1.24	9	2.12%
1.15	5	1.18%
Other	12	2.83%
SurgeSMTP (293 servers)
Version	Number of Servers	Percent
7.3o4-4	47	16.04%
7.4o-1	45	15.36%
7.5a-1	26	8.87%
7.3e2-2	22	7.51%
7.1e-1	17	5.80%
7.4e-1	14	4.78%
6.5a2-2	12	4.10%
7.3i2-2	11	3.75%
6.7c-1	8	2.73%
7.5b-18	7	2.39%
3.9e-1	6	2.05%
7.2a-1	6	2.05%
7.4g-1	5	1.71%
7.4m-1	5	1.71%
6.9c-1	4	1.37%
7.2i-1	3	1.02%
6.5a-1	3	1.02%
Other	52	17.75%
OpenSMTPD (255 servers)
Version	Number of Servers	Percent
Other	255	100.00%
Lotus Domino (190 servers)
Version	Number of Servers	Percent
8.5.3	40	21.05%
8.5.3FP6	36	18.95%
7.0	9	4.74%
8.5.2FP2	9	4.74%
8.5.2	8	4.21%
8.5.1	8	4.21%
7.0.3	6	3.16%
8.5.3FP4	5	2.63%
8.5.3FP1	4	2.11%
8.5.3FP3	4	2.11%
7.0.2	4	2.11%
6.5	3	1.58%
8.5.3FP5	3	1.58%
6.5.4	3	1.58%
8.5	3	1.58%
8.5.2FP3	3	1.58%
7.0.3FP1	3	1.58%
7.0.4	3	1.58%
8.5.2FP1	2	1.05%
5.0.13	2	1.05%
8.0	2	1.05%
6.5.1	2	1.05%
8.5.3FP2	2	1.05%
8.5.2FP4	2	1.05%
5.0.8	2	1.05%
7.5.1	2	1.05%
6.5.3	2	1.05%
7.0.4FP2	2	1.05%
8.0.1	2	1.05%
Other	14	7.37%
WinWebMail (126 servers)
Version	Number of Servers	Percent
4.2.0.1	31	24.60%
3.9.0.7	24	19.05%
3.8.1.3	11	8.73%
4.3.0.1	9	7.14%
3.7.6.1	5	3.97%
4.0.0.1	5	3.97%
3.8.6.1	5	3.97%
3.9.0.1	5	3.97%
3.8.1.1	4	3.17%
4.1.0.1	3	2.38%
3.7.3.1	3	2.38%
1.0	3	2.38%
3.8.5.1	3	2.38%
3.8.0.1	3	2.38%
3.8.1.5	3	2.38%
3.7.5.1	2	1.59%
Other	7	5.56%
MagicMail (111 servers)
Version	Number of Servers	Percent
Other	111	100.00%
Merak (89 servers)
Version	Number of Servers	Percent
8.0.3	25	28.09%
8.9.1	22	24.72%
7.6.1	9	10.11%
9.0.3	5	5.62%
7.4.5	5	5.62%
8.5.0	4	4.49%
8.3.8	4	4.49%
7.6.0	2	2.25%
6.0.8	2	2.25%
8.0.1	1	1.12%
8.9.2	1	1.12%
8.3.6	1	1.12%
6.1.0	1	1.12%
4.2.1	1	1.12%
5.8.2	1	1.12%
8.9.7	1	1.12%
7.6.4	1	1.12%
7.4.4	1	1.12%
7.0.1	1	1.12%
8.9.0	1	1.12%
Other	0	0.00%
Kerio (88 servers)
Version	Number of Servers	Percent
6.7.3	17	19.32%
6.7.0	12	13.64%
6.7.2	10	11.36%
6.6.1	9	10.23%
6.7.1	8	9.09%
6.6.2	8	9.09%
6.5.2	6	6.82%
6.5.0	5	5.68%
6.4.1	2	2.27%
6.3.0	2	2.27%
5.7.9	2	2.27%
6.0.10	1	1.14%
6.4.0	1	1.14%
6.3.1	1	1.14%
6.0.8	1	1.14%
6.6.0	1	1.14%
6.5.1	1	1.14%
6.1.0	1	1.14%
Other	0	0.00%
Post.Office (68 servers)
Version	Number of Servers	Percent
4.3	18	26.47%
4.4	17	25.00%
4.2.2	14	20.59%
4.1.2.4	4	5.88%
3.5.3	3	4.41%
3.9.2	2	2.94%
4.1.1	2	2.94%
4.2.1.1	2	2.94%
3.5.3J	1	1.47%
3.6.2	1	1.47%
4.1.0.3	1	1.47%
4.1	1	1.47%
3.1.2	1	1.47%
3.1.2J	1	1.47%
Other	0	0.00%
ArGoSoft (48 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	29.17%
1.8 (1.8.9.5)	7	14.58%
1.8 (1.8.9.3)	5	10.42%
1.8 (1.8.8.8)	3	6.25%
1.8 (1.8.7.3)	3	6.25%
1.8 (1.8.8.7)	2	4.17%
1.8 (1.8.9.2)	2	4.17%
1.8 (1.8.9.1)	2	4.17%
1.8 (1.8.6.1)	1	2.08%
1.8 (1.8.8.9)	1	2.08%
1.8 (1.8.7.6)	1	2.08%
1.8 (1.8.5.8)	1	2.08%
1.8 (1.8.8.4)	1	2.08%
1.8 (1.8.1.7)	1	2.08%
1.8 (1.8.2.1)	1	2.08%
1.8 (1.8.6.0)	1	2.08%
1.8 (1.8.9.4)	1	2.08%
1.8 (1.8.2.5)	1	2.08%
Other	0	0.00%
GroupWise (44 servers)
Version	Number of Servers	Percent
18.1.1	8	18.18%
18.2.1	7	15.91%
18.2.0	5	11.36%
18.1.0	4	9.09%
14.2.2	3	6.82%
14.2.1	3	6.82%
14.2.0	2	4.55%
14.0.0	2	4.55%
18.0.0	2	4.55%
14.2.3	2	4.55%
6.5.7	1	2.27%
6.5.0	1	2.27%
7.0.1	1	2.27%
7.0.2	1	2.27%
18.0.2	1	2.27%
8.0.2	1	2.27%
Other	0	0.00%
Gordano Messaging Suite (GMS) (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
Trend Micro (13 servers)
Version	Number of Servers	Percent
5.7	5	38.46%
5.18	4	30.77%
7.5	2	15.38%
7.5ready	1	7.69%
7.1	1	7.69%
Other	0	0.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	5	62.50%
7.3	2	25.00%
8.2	1	12.50%
Other	0	0.00%
VisNetic (6 servers)
Version	Number of Servers	Percent
9.3.2.0	3	50.00%
8.0.3	1	16.67%
6.2.2.0	1	16.67%
5.0.1	1	16.67%
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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	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%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%