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	1,678,422	100.0%
Number of Servers that didn't respond	312,418	18.61%
Server didn't open socket	307,444	18.32%
Server didn't provide banner	4,974	0.30%
Server provided banner	1,366,004	81.39%
Server banner identifies software in use	846,716	50.45%

As indicated by the above table, of the 1,678,422 servers queried, only 846,716 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	482,378	56.97%
Postfix	297,720	35.16%
Sendmail	32,179	3.80%
MailEnable	17,562	2.07%
MDaemon	6,470	0.76%
Microsoft	3,941	0.47%
IMail	1,188	0.14%
CommuniGate Pro	1,180	0.14%
XMail	725	0.09%
Qmail Toaster	691	0.08%
SurgeSMTP	488	0.06%
Lotus Domino	422	0.05%
WinWebMail	418	0.05%
OpenSMTPD	399	0.05%
Kerio	206	0.02%
MagicMail	175	0.02%
Merak	144	0.02%
Post.Office	121	0.01%
ArGoSoft	86	0.01%
GroupWise	80	0.01%
Gordano Messaging Suite (GMS)	59	0.01%
Trend Micro	35	0.00%
OpenVMS	13	0.00%
VisNetic	9	0.00%
InterScan VirusWall	9	0.00%
Interscan	4	0.00%
Mercury	3	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mirapoint	2	0.00%
WebSTAR	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (482,378 servers)
Version	Number of Servers	Percent
4.93	233,796	48.47%
4.92	132,852	27.54%
4.91	27,025	5.60%
4.92.3	17,470	3.62%
4.93.0.4	16,844	3.49%
4.87	9,165	1.90%
4.89	8,379	1.74%
4.84	6,894	1.43%
4.90	5,265	1.09%
4.92.2	5,077	1.05%
Other	19,611	4.07%
Postfix (297,720 servers)
Version	Number of Servers	Percent
Other	297,720	100.00%
Sendmail (32,179 servers)
Version	Number of Servers	Percent
8.15.2	13,327	41.42%
8.14.4	5,777	17.95%
8.14.7	3,015	9.37%
8.13.8	2,858	8.88%
8.14.5	2,371	7.37%
8.13.1	1,583	4.92%
8.14.9	849	2.64%
8.14.3	572	1.78%
Other	1,827	5.68%
MailEnable (17,562 servers)
Version	Number of Servers	Percent
10.25--	4,640	26.42%
10.27--	2,603	14.82%
9.00--	876	4.99%
10.29--	486	2.77%
10.12--	324	1.84%
9.16--	306	1.74%
10.29--10.29	302	1.72%
8.60--	285	1.62%
10.29-10.29-	229	1.30%
8.53--	215	1.22%
10.20--	193	1.10%
9.00--9.00	187	1.06%
6.5--	186	1.06%
Other	6,730	38.32%
MDaemon (6,470 servers)
Version	Number of Servers	Percent
19.5.5	845	13.06%
13.5.1	436	6.74%
13.6.3	369	5.70%
13.0.4	260	4.02%
13.0.5	254	3.93%
19.5.4	250	3.86%
11.0.3	231	3.57%
11.0.0	229	3.54%
16.5.2	194	3.00%
19.5.3	140	2.16%
12.5.6	138	2.13%
12.5.4	134	2.07%
14.5.2	130	2.01%
19.0.3	110	1.70%
10.1.2	87	1.34%
10.0.0	82	1.27%
15.0.3	77	1.19%
16.0.4	75	1.16%
19.5.1	74	1.14%
Other	2,355	36.40%
Microsoft (3,941 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,679	42.60%
8.5.9600.16384	580	14.72%
7.5.7601.17514	454	11.52%
10.0.14393.2608	284	7.21%
6.0.3790.3959	222	5.63%
5.0.2195.5329	119	3.02%
8.0.9200.16384	93	2.36%
10.0.17763.1	77	1.95%
6.0.3790.1830	63	1.60%
5.0.2195.6713	58	1.47%
7.0.6002.18264	56	1.42%
5.0.2195.7381	42	1.07%
Other	214	5.43%
IMail (1,188 servers)
Version	Number of Servers	Percent
12.5.7.59	157	13.22%
12.5.6.101	145	12.21%
12.4.1.15	119	10.02%
12.5.8.41	78	6.57%
9.23	72	6.06%
12.5.3.93	57	4.80%
8.22	57	4.80%
12.5.5.115	55	4.63%
12.3.0.100	44	3.70%
8.15	42	3.54%
8.05	42	3.54%
11.03	30	2.53%
12.5.4.146	30	2.53%
12.5.6.105	23	1.94%
10.02	22	1.85%
12.5.7.58	22	1.85%
12.5.5.117	19	1.60%
11.5	14	1.18%
10.01	14	1.18%
8.00	13	1.09%
Other	133	11.20%
CommuniGate Pro (1,180 servers)
Version	Number of Servers	Percent
6.2.14	124	10.51%
6.2.15	65	5.51%
6.2.12	53	4.49%
6.0.11	46	3.90%
6.1.20	42	3.56%
6.1.16	39	3.31%
5.4.11	38	3.22%
5.3.13	34	2.88%
5.2.20	33	2.80%
6.1.18	28	2.37%
6.2.13	26	2.20%
5.1.16	25	2.12%
6.0.9	24	2.03%
6.2.10	21	1.78%
6.1.11	19	1.61%
5.2.3	14	1.19%
6.2.9	14	1.19%
6.1.12	14	1.19%
6.2.7	13	1.10%
6.1.2	13	1.10%
6.2.1	13	1.10%
6.1.9	12	1.02%
5.3.15	12	1.02%
6.1.10	12	1.02%
Other	446	37.80%
XMail (725 servers)
Version	Number of Servers	Percent
1.27	364	50.21%
1.22	232	32.00%
1.26	41	5.66%
1.25	32	4.41%
1.24	25	3.45%
Other	31	4.28%
Qmail Toaster (691 servers)
Version	Number of Servers	Percent
1.3	515	74.53%
1.03	159	23.01%
1.03.5	8	1.16%
Other	9	1.30%
SurgeSMTP (488 servers)
Version	Number of Servers	Percent
7.3o4-4	122	25.00%
7.4e-1	70	14.34%
7.3e2-2	48	9.84%
7.1e-1	28	5.74%
6.5a2-2	22	4.51%
7.3i2-2	19	3.89%
6.7c-1	16	3.28%
7.2i-1	13	2.66%
7.2a-1	12	2.46%
3.9e-1	10	2.05%
7.4k-1	8	1.64%
7.0c2-2	8	1.64%
6.5a-1	7	1.43%
7.4i-1	7	1.43%
7.4g-1	6	1.23%
6.9c-1	6	1.23%
4.0u4-4	5	1.02%
Other	81	16.60%
Lotus Domino (422 servers)
Version	Number of Servers	Percent
8.5.3FP6	93	22.04%
8.5.3	58	13.74%
7.0.2	18	4.27%
8.5.2	18	4.27%
8.5.1	15	3.55%
8.5	14	3.32%
7.0	12	2.84%
8.5.2FP2	11	2.61%
8.5.2FP3	10	2.37%
8.0.1	9	2.13%
8.5.3FP3	9	2.13%
8.5.3FP4	8	1.90%
8.5.2FP4	8	1.90%
7.0.3	8	1.90%
8.5.3FP5	7	1.66%
6.5.4	6	1.42%
8.5.2FP4HF759	6	1.42%
8.5.1FP5	6	1.42%
8.0	6	1.42%
8.5.3FP2	6	1.42%
8.5.3FP1	6	1.42%
6.5	5	1.18%
6.5.3	5	1.18%
Other	78	18.48%
WinWebMail (418 servers)
Version	Number of Servers	Percent
4.2.0.1	99	23.68%
3.9.0.7	68	16.27%
3.8.1.3	48	11.48%
3.9.0.1	32	7.66%
3.8.0.1	18	4.31%
4.1.0.1	14	3.35%
3.7.6.1	13	3.11%
3.8.1.5	12	2.87%
3.8.1.1	12	2.87%
4.0.0.1	11	2.63%
3.7.3.1	10	2.39%
3.9.2.1	9	2.15%
3.8.3.1	8	1.91%
3.7.7.3	8	1.91%
3.8.5.1	8	1.91%
3.8.6.1	6	1.44%
3.9.3.1	5	1.20%
1.0	5	1.20%
3.9.5.3	5	1.20%
3.7.1.1	5	1.20%
Other	22	5.26%
OpenSMTPD (399 servers)
Version	Number of Servers	Percent
Other	399	100.00%
Kerio (206 servers)
Version	Number of Servers	Percent
6.7.3	47	22.82%
6.7.0	26	12.62%
6.7.2	22	10.68%
6.6.2	18	8.74%
6.5.2	18	8.74%
6.7.1	10	4.85%
6.6.1	10	4.85%
6.5.0	10	4.85%
6.4.1	9	4.37%
6.4.0	5	2.43%
6.3.1	4	1.94%
6.1.0	4	1.94%
6.3.0	3	1.46%
6.6.0	3	1.46%
Other	17	8.25%
MagicMail (175 servers)
Version	Number of Servers	Percent
Other	175	100.00%
Merak (144 servers)
Version	Number of Servers	Percent
8.9.1	35	24.31%
8.0.3	34	23.61%
7.6.1	10	6.94%
9.0.3	8	5.56%
7.4.5	8	5.56%
8.5.0	7	4.86%
8.3.8	7	4.86%
7.5.2	4	2.78%
7.6.4	4	2.78%
6.0.8	3	2.08%
7.4.2	2	1.39%
4.4.1	2	1.39%
7.6.0	2	1.39%
7.0.1	2	1.39%
Other	16	11.11%
Post.Office (121 servers)
Version	Number of Servers	Percent
4.3	32	26.45%
4.4	21	17.36%
4.2.2	20	16.53%
4.1.2.4	11	9.09%
3.5.3	8	6.61%
4.2.1.3	5	4.13%
4.1.1	3	2.48%
3.5.1	3	2.48%
3.9.2	2	1.65%
4.0.1	2	1.65%
4.2.1.1	2	1.65%
Other	12	9.92%
ArGoSoft (86 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	28	32.56%
1.8 (1.8.9.3)	14	16.28%
1.8 (1.8.9.5)	13	15.12%
1.8 (1.8.9.1)	5	5.81%
1.8 (1.8.8.8)	3	3.49%
1.8 (1.8.7.3)	3	3.49%
1.8 (1.8.7.6)	3	3.49%
1.8 (1.8.8.9)	2	2.33%
1.8 (1.8.8.7)	2	2.33%
1.8 (1.8.6.0)	2	2.33%
1.8 (1.8.6.1)	1	1.16%
1.8 (1.8.5.5)	1	1.16%
1.8 (1.8.5.8)	1	1.16%
1.8 (1.8.9.0)	1	1.16%
1.8 (1.8.9.4)	1	1.16%
1.8 (1.8.3.5)	1	1.16%
1.8 (1.8.1.1)	1	1.16%
1.8 (1.8.5.9)	1	1.16%
1.8 (1.8.9.2)	1	1.16%
1.8 (1.8.2.1)	1	1.16%
1.8 (1.8.2.5)	1	1.16%
Other	0	0.00%
GroupWise (80 servers)
Version	Number of Servers	Percent
18.1.1	13	16.25%
18.2.0	9	11.25%
14.2.2	9	11.25%
18.1.0	7	8.75%
14.2.3	6	7.50%
14.2.1	5	6.25%
18.2.1	5	6.25%
18.0.2	4	5.00%
14.2.0	3	3.75%
14.0.0	3	3.75%
14.0.1	2	2.50%
6.5.7	2	2.50%
8.0.3	2	2.50%
18.0.0	2	2.50%
6.5.0	1	1.25%
6.5.5	1	1.25%
12.0.1	1	1.25%
7.0.1	1	1.25%
6.5.4	1	1.25%
7.0.2	1	1.25%
6.0.2	1	1.25%
8.0.2	1	1.25%
Other	0	0.00%
Gordano Messaging Suite (GMS) (59 servers)
Version	Number of Servers	Percent
Other	59	100.00%
Trend Micro (35 servers)
Version	Number of Servers	Percent
5.7	10	28.57%
5.18	10	28.57%
5.5	5	14.29%
7.5	5	14.29%
7.0	2	5.71%
7.5ready	1	2.86%
8	1	2.86%
7.1	1	2.86%
Other	0	0.00%
OpenVMS (13 servers)
Version	Number of Servers	Percent
8.4	7	53.85%
7.3	3	23.08%
8.3	2	15.38%
8.2	1	7.69%
Other	0	0.00%
VisNetic (9 servers)
Version	Number of Servers	Percent
9.3.2.0	7	77.78%
8.0.3	1	11.11%
5.5.8.3	1	11.11%
Other	0	0.00%
InterScan VirusWall (9 servers)
Version	Number of Servers	Percent
Other	9	100.00%
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%
Mercury (3 servers)
Version	Number of Servers	Percent
1.48	2	66.67%
3.32	1	33.33%
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%
Mirapoint (2 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	50.00%
4.4.6-GA	1	50.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%