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	1,325,590	100.0%
Number of Servers that didn't respond	235,944	17.80%
Server didn't open socket	232,027	17.50%
Server didn't provide banner	3,917	0.30%
Server provided banner	1,089,646	82.20%
Server banner identifies software in use	692,450	52.24%

As indicated by the above table, of the 1,325,590 servers queried, only 692,450 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	401,624	58.00%
Postfix	241,799	34.92%
Sendmail	24,395	3.52%
MailEnable	13,837	2.00%
MDaemon	3,922	0.57%
Microsoft	2,223	0.32%
CommuniGate Pro	866	0.13%
IMail	823	0.12%
XMail	536	0.08%
Qmail Toaster	526	0.08%
OpenSMTPD	418	0.06%
SurgeSMTP	395	0.06%
Lotus Domino	257	0.04%
WinWebMail	197	0.03%
MagicMail	158	0.02%
Kerio	104	0.02%
Merak	104	0.02%
Post.Office	78	0.01%
ArGoSoft	55	0.01%
GroupWise	55	0.01%
Gordano Messaging Suite (GMS)	29	0.00%
Trend Micro	19	0.00%
OpenVMS	11	0.00%
InterScan VirusWall	5	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
MessageWall	2	0.00%
Neon Mail Server	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
Mercury	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (401,624 servers)
Version	Number of Servers	Percent
4.94.2	287,367	71.55%
4.93	51,708	12.87%
4.94	12,643	3.15%
4.92	8,757	2.18%
4.91	6,792	1.69%
4.92.3	5,076	1.26%
4.89	4,861	1.21%
Other	24,420	6.08%
Postfix (241,799 servers)
Version	Number of Servers	Percent
Other	241,799	100.00%
Sendmail (24,395 servers)
Version	Number of Servers	Percent
8.15.2	11,988	49.14%
8.14.4	3,494	14.32%
8.14.7	2,877	11.79%
8.13.8	1,574	6.45%
8.14.5	1,428	5.85%
8.16.1	752	3.08%
8.13.1	476	1.95%
8.14.9	450	1.84%
8.14.3	302	1.24%
Other	1,054	4.32%
MailEnable (13,837 servers)
Version	Number of Servers	Percent
10.27--	3,482	25.16%
10.34--	2,622	18.95%
10.25--	878	6.35%
9.00--	419	3.03%
10.31--	310	2.24%
10.29--	224	1.62%
10.31-10.31-	218	1.58%
10.30--	180	1.30%
9.16--	154	1.11%
10.31--10.31	143	1.03%
Other	5,207	37.63%
MDaemon (3,922 servers)
Version	Number of Servers	Percent
21.0.2	374	9.54%
13.5.1	276	7.04%
21.0.3	234	5.97%
21.0.1	162	4.13%
13.0.5	160	4.08%
19.5.5	156	3.98%
11.0.0	148	3.77%
13.0.4	147	3.75%
11.0.3	140	3.57%
19.5.4	135	3.44%
16.5.2	107	2.73%
12.5.6	82	2.09%
20.0.4	77	1.96%
14.5.2	74	1.89%
20.0.3	56	1.43%
12.5.4	49	1.25%
10.0.0	49	1.25%
10.1.2	40	1.02%
Other	1,456	37.12%
Microsoft (2,223 servers)
Version	Number of Servers	Percent
6.0.3790.4675	795	35.76%
8.5.9600.16384	355	15.97%
7.5.7601.17514	193	8.68%
10.0.14393.4169	180	8.10%
6.0.3790.3959	127	5.71%
10.0.17763.1697	124	5.58%
5.0.2195.5329	84	3.78%
8.0.9200.16384	61	2.74%
10.0.14393.2608	45	2.02%
5.0.2195.6713	35	1.57%
6.0.3790.1830	32	1.44%
10.0.17763.1	31	1.39%
7.0.6002.18264	30	1.35%
Other	131	5.89%
CommuniGate Pro (866 servers)
Version	Number of Servers	Percent
6.2.15	109	12.59%
6.2.14	83	9.58%
6.1.20	34	3.93%
6.0.11	32	3.70%
6.2.12	29	3.35%
5.2.20	24	2.77%
5.4.11	22	2.54%
6.1.16	20	2.31%
6.3.5	19	2.19%
6.1.18	19	2.19%
6.3.3	17	1.96%
6.0.9	17	1.96%
5.1.16	15	1.73%
6.3.6	14	1.62%
6.2.10	13	1.50%
6.3.7	12	1.39%
6.3.4	12	1.39%
5.2.3	11	1.27%
6.0.7	10	1.15%
6.2.7	10	1.15%
6.1.11	9	1.04%
6.1.10	9	1.04%
Other	326	37.64%
IMail (823 servers)
Version	Number of Servers	Percent
12.5.8.41	144	17.50%
12.4.1.15	90	10.94%
12.5.7.59	84	10.21%
12.5.6.101	81	9.84%
9.23	46	5.59%
8.22	39	4.74%
12.5.5.115	35	4.25%
12.5.3.93	29	3.52%
8.05	29	3.52%
12.5.6.105	27	3.28%
12.3.0.100	22	2.67%
10.02	22	2.67%
12.5.4.146	19	2.31%
8.15	19	2.31%
12.5.7.58	13	1.58%
12.5.5.117	13	1.58%
11.5	12	1.46%
7.07	9	1.09%
Other	90	10.94%
XMail (536 servers)
Version	Number of Servers	Percent
1.27	278	51.87%
1.22	172	32.09%
1.26	23	4.29%
1.25	23	4.29%
1.24	18	3.36%
Other	22	4.10%
Qmail Toaster (526 servers)
Version	Number of Servers	Percent
1.3	384	73.00%
1.03	134	25.48%
Other	8	1.52%
OpenSMTPD (418 servers)
Version	Number of Servers	Percent
Other	418	100.00%
SurgeSMTP (395 servers)
Version	Number of Servers	Percent
7.3o4-4	56	14.18%
7.5c-1	55	13.92%
7.5a-1	39	9.87%
7.4o-1	37	9.37%
7.3e2-2	23	5.82%
7.1e-1	17	4.30%
7.4e-1	15	3.80%
7.2i-1	11	2.78%
6.7c-1	10	2.53%
7.5d-2	10	2.53%
7.3i2-2	9	2.28%
7.5d-7	8	2.03%
6.5a2-2	7	1.77%
7.2a-1	6	1.52%
7.5b-22	5	1.27%
6.5a-1	5	1.27%
7.4m-1	4	1.01%
3.9e-1	4	1.01%
Other	74	18.73%
Lotus Domino (257 servers)
Version	Number of Servers	Percent
8.5.3FP6	56	21.79%
8.5.3	40	15.56%
8.5.1	14	5.45%
8.5.2	12	4.67%
8.5	10	3.89%
7.0.2	9	3.50%
7.0	8	3.11%
8.5.3FP3	8	3.11%
8.5.2FP4HF759	6	2.33%
6.5	5	1.95%
8.5.2FP2	5	1.95%
7.0.3	5	1.95%
8.5.2FP3	5	1.95%
8.5.3FP4	4	1.56%
8.0	4	1.56%
6.5.1	4	1.56%
7.0.3FP1	4	1.56%
8.5.1FP5	3	1.17%
8.5.2FP4	3	1.17%
6.5.5	3	1.17%
6.5.4	3	1.17%
8.0.1	3	1.17%
5.0.8	3	1.17%
8.5.3FP1	3	1.17%
Other	37	14.40%
WinWebMail (197 servers)
Version	Number of Servers	Percent
4.2.0.1	40	20.30%
3.9.0.7	24	12.18%
3.8.1.3	22	11.17%
4.3.0.1	21	10.66%
3.9.0.1	12	6.09%
4.1.0.1	10	5.08%
3.7.3.1	10	5.08%
4.0.0.1	9	4.57%
3.8.0.1	8	4.06%
3.8.1.1	5	2.54%
3.8.1.5	4	2.03%
3.9.3.1	3	1.52%
3.7.7.3	3	1.52%
3.7.6.1	3	1.52%
3.8.6.1	3	1.52%
3.8.3.1	2	1.02%
3.9.1.1	2	1.02%
4.4.0.1	2	1.02%
3.8.2.1	2	1.02%
3.7.1.1	2	1.02%
Other	10	5.08%
MagicMail (158 servers)
Version	Number of Servers	Percent
Other	158	100.00%
Kerio (104 servers)
Version	Number of Servers	Percent
6.7.3	25	24.04%
6.7.0	19	18.27%
6.6.2	12	11.54%
6.7.2	8	7.69%
6.6.1	7	6.73%
6.7.1	5	4.81%
6.5.0	5	4.81%
6.5.2	4	3.85%
6.3.1	2	1.92%
6.3.0	2	1.92%
5.7.9	2	1.92%
6.0.5	2	1.92%
5.7.6	2	1.92%
6.5.1	2	1.92%
Other	7	6.73%
Merak (104 servers)
Version	Number of Servers	Percent
8.9.1	29	27.88%
8.0.3	24	23.08%
7.6.1	9	8.65%
7.4.5	7	6.73%
9.0.3	7	6.73%
8.3.8	4	3.85%
7.6.4	3	2.88%
7.4.2	2	1.92%
8.5.0	2	1.92%
7.5.2	2	1.92%
7.6.0	2	1.92%
6.0.8	2	1.92%
Other	11	10.58%
Post.Office (78 servers)
Version	Number of Servers	Percent
4.4	16	20.51%
4.3	16	20.51%
4.2.2	15	19.23%
3.5.3	7	8.97%
4.1.2.4	6	7.69%
3.5.1	3	3.85%
4.2.1.3	3	3.85%
4.2.1.1	2	2.56%
3.9.2	1	1.28%
4.1.1	1	1.28%
4.0.1	1	1.28%
3.5.3J	1	1.28%
4.1.0.3	1	1.28%
4.1	1	1.28%
3.1.2	1	1.28%
3.1.2J	1	1.28%
4.2	1	1.28%
4.2.1	1	1.28%
Other	0	0.00%
ArGoSoft (55 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	16	29.09%
1.8 (1.8.9.3)	8	14.55%
1.8 (1.8.9.5)	6	10.91%
1.8 (1.8.9.1)	4	7.27%
1.8 (1.8.8.8)	2	3.64%
1.8 (1.8.7.3)	2	3.64%
1.8 (1.8.7.6)	2	3.64%
1.8 (1.8.8.9)	2	3.64%
1.8 (1.8.9.2)	2	3.64%
1.8 (1.8.2.1)	2	3.64%
1.8 (1.8.5.5)	1	1.82%
1.8 (1.8.5.9)	1	1.82%
1.8 (1.8.8.7)	1	1.82%
1.8 (1.8.5.8)	1	1.82%
1.8 (1.8.8.4)	1	1.82%
1.8 (1.8.6.0)	1	1.82%
1.8 (1.8.9.4)	1	1.82%
1.8 (1.8.3.5)	1	1.82%
1.8 (1.8.2.5)	1	1.82%
Other	0	0.00%
GroupWise (55 servers)
Version	Number of Servers	Percent
18.2.1	8	14.55%
18.2.0	6	10.91%
18.1.1	6	10.91%
18.1.0	6	10.91%
18.3.1	5	9.09%
14.2.2	4	7.27%
18.3.0	3	5.45%
14.0.0	3	5.45%
6.5.7	2	3.64%
14.2.3	2	3.64%
14.2.1	2	3.64%
18.0.0	1	1.82%
6.5.0	1	1.82%
8.0.3	1	1.82%
7.0.1	1	1.82%
14.2.0	1	1.82%
6.5.2	1	1.82%
18.0.2	1	1.82%
6.0.4	1	1.82%
Other	0	0.00%
Gordano Messaging Suite (GMS) (29 servers)
Version	Number of Servers	Percent
Other	29	100.00%
Trend Micro (19 servers)
Version	Number of Servers	Percent
5.7	7	36.84%
5.18	4	21.05%
5.5	2	10.53%
7.5	2	10.53%
7.5ready	1	5.26%
8	1	5.26%
7.0	1	5.26%
7.1	1	5.26%
Other	0	0.00%
OpenVMS (11 servers)
Version	Number of Servers	Percent
8.4	6	54.55%
7.3	4	36.36%
8.3	1	9.09%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	2	50.00%
8.0.3	1	25.00%
5.0.1	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%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.81-Build_1022	1	50.00%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	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%
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%
Mercury (1 servers)
Version	Number of Servers	Percent
4	1	100.00%
Other	0	0.00%