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	1,057,120	100.0%
Number of Servers that didn't respond	182,321	17.25%
Server didn't open socket	179,512	16.98%
Server didn't provide banner	2,809	0.27%
Server provided banner	874,799	82.75%
Server banner identifies software in use	567,561	53.69%

As indicated by the above table, of the 1,057,120 servers queried, only 567,561 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	333,558	58.77%
Postfix	195,899	34.52%
Sendmail	19,572	3.45%
MailEnable	10,960	1.93%
MDaemon	2,748	0.48%
Microsoft	1,424	0.25%
CommuniGate Pro	681	0.12%
IMail	502	0.09%
Qmail Toaster	427	0.08%
XMail	386	0.07%
OpenSMTPD	364	0.06%
SurgeSMTP	305	0.05%
Lotus Domino	145	0.03%
MagicMail	131	0.02%
WinWebMail	126	0.02%
Kerio	70	0.01%
Merak	69	0.01%
Post.Office	56	0.01%
ArGoSoft	46	0.01%
GroupWise	40	0.01%
Gordano Messaging Suite (GMS)	18	0.00%
OpenVMS	9	0.00%
Trend Micro	6	0.00%
VisNetic	5	0.00%
InterScan VirusWall	4	0.00%
ModusMail	2	0.00%
WebSTAR V	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
MessageWall	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (333,558 servers)
Version	Number of Servers	Percent
4.95	235,727	70.67%
4.94.2	34,877	10.46%
4.93	18,905	5.67%
4.96	9,092	2.73%
4.92	5,496	1.65%
4.94	4,614	1.38%
4.91	3,827	1.15%
Other	21,020	6.30%
Postfix (195,899 servers)
Version	Number of Servers	Percent
Other	195,899	100.00%
Sendmail (19,572 servers)
Version	Number of Servers	Percent
8.15.2	10,073	51.47%
8.14.7	2,370	12.11%
8.14.4	2,271	11.60%
8.13.8	1,059	5.41%
8.16.1	994	5.08%
8.14.5	939	4.80%
8.13.1	323	1.65%
8.14.9	316	1.61%
8.17.1	299	1.53%
Other	928	4.74%
MailEnable (10,960 servers)
Version	Number of Servers	Percent
10.34--	4,575	41.74%
10.27--	607	5.54%
10.25--	495	4.52%
9.00--	279	2.55%
10.37--	274	2.50%
10.39--	184	1.68%
10.31--	158	1.44%
10.31-10.31-	155	1.41%
10.39--10.39	139	1.27%
10.29--	117	1.07%
Other	3,977	36.29%
MDaemon (2,748 servers)
Version	Number of Servers	Percent
21.5.2	251	9.13%
22.0.1	213	7.75%
13.5.1	178	6.48%
22.0.0	127	4.62%
13.0.5	113	4.11%
13.0.4	95	3.46%
19.5.4	91	3.31%
11.0.3	90	3.28%
11.0.0	90	3.28%
16.5.2	66	2.40%
19.5.5	65	2.37%
21.0.3	61	2.22%
12.5.6	59	2.15%
21.5.1	57	2.07%
14.5.2	57	2.07%
21.0.1	44	1.60%
10.0.0	32	1.16%
12.5.4	31	1.13%
10.1.2	30	1.09%
21.5.0	29	1.06%
Other	969	35.26%
Microsoft (1,424 servers)
Version	Number of Servers	Percent
6.0.3790.4675	437	30.69%
8.5.9600.16384	219	15.38%
10.0.17763.1697	146	10.25%
10.0.14393.4169	144	10.11%
7.5.7601.17514	118	8.29%
6.0.3790.3959	83	5.83%
5.0.2195.5329	54	3.79%
8.0.9200.16384	41	2.88%
5.0.2195.6713	27	1.90%
7.0.6002.18264	19	1.33%
6.0.3790.1830	17	1.19%
10.0.17763.1	15	1.05%
Other	104	7.30%
CommuniGate Pro (681 servers)
Version	Number of Servers	Percent
6.2.15	77	11.31%
6.2.14	65	9.54%
6.1.20	34	4.99%
6.3.13	31	4.55%
6.0.11	21	3.08%
5.2.20	19	2.79%
6.1.16	16	2.35%
6.0.9	15	2.20%
6.2.12	14	2.06%
6.1.18	14	2.06%
5.4.11	12	1.76%
6.3.11	12	1.76%
6.3.6	11	1.62%
7.1.1	10	1.47%
7.1.2	9	1.32%
6.3.3	8	1.17%
6.1.11	8	1.17%
6.3.5	8	1.17%
5.1.16	8	1.17%
6.1.19	7	1.03%
6.2.7	7	1.03%
6.2.10	7	1.03%
Other	268	39.35%
IMail (502 servers)
Version	Number of Servers	Percent
12.5.8.41	68	13.55%
12.5.7.59	42	8.37%
12.5.6.101	42	8.37%
9.23	34	6.77%
12.5.8.58	34	6.77%
12.5.3.93	21	4.18%
12.4.1.15	21	4.18%
8.22	18	3.59%
12.5.8.59	18	3.59%
12.5.8.54	17	3.39%
10.02	17	3.39%
12.5.5.115	17	3.39%
8.05	16	3.19%
12.5.6.105	16	3.19%
12.3.0.100	13	2.59%
8.15	12	2.39%
12.5.4.146	11	2.19%
12.5.5.117	11	2.19%
12.6.0.16	8	1.59%
7.07	6	1.20%
Other	60	11.95%
Qmail Toaster (427 servers)
Version	Number of Servers	Percent
1.3	315	73.77%
1.03	107	25.06%
Other	5	1.17%
XMail (386 servers)
Version	Number of Servers	Percent
1.27	222	57.51%
1.22	110	28.50%
1.25	18	4.66%
1.26	14	3.63%
1.24	10	2.59%
1.15	5	1.30%
Other	7	1.81%
OpenSMTPD (364 servers)
Version	Number of Servers	Percent
Other	364	100.00%
SurgeSMTP (305 servers)
Version	Number of Servers	Percent
7.6j-1	59	19.34%
7.3o4-4	35	11.48%
7.5c-1	24	7.87%
7.3e2-2	21	6.89%
7.5a-1	18	5.90%
7.6h-2	15	4.92%
7.1e-1	11	3.61%
7.6d-1	10	3.28%
7.6m-1	10	3.28%
7.4o-1	9	2.95%
6.5a2-2	8	2.62%
7.4e-1	7	2.30%
7.3i2-2	5	1.64%
6.9c-1	4	1.31%
6.5a-1	4	1.31%
6.7c-1	4	1.31%
Other	61	20.00%
Lotus Domino (145 servers)
Version	Number of Servers	Percent
8.5.3FP6	24	16.55%
8.5.3	21	14.48%
8.5.1	11	7.59%
7.0	6	4.14%
8.5.2FP2	6	4.14%
8.5.1FP5	5	3.45%
7.0.3	5	3.45%
7.0.2	5	3.45%
8.5.3FP3	4	2.76%
8.5.2	4	2.76%
8.5.2FP1	3	2.07%
8.5.3FP4	3	2.07%
6.5.1	3	2.07%
6.5.4	3	2.07%
8.5	3	2.07%
8.5.2FP3	3	2.07%
6.5	2	1.38%
8.5.3FP5	2	1.38%
8.0.2	2	1.38%
8.5.2FP4	2	1.38%
5.0.8	2	1.38%
7.5.1	2	1.38%
7.0.4FP2	2	1.38%
8.5.3FP1	2	1.38%
7.0.3FP1	2	1.38%
Other	18	12.41%
MagicMail (131 servers)
Version	Number of Servers	Percent
Other	131	100.00%
WinWebMail (126 servers)
Version	Number of Servers	Percent
4.4.0.1	21	16.67%
4.2.0.1	20	15.87%
3.9.0.7	19	15.08%
3.8.1.3	10	7.94%
4.3.0.1	9	7.14%
3.7.3.1	6	4.76%
3.8.6.1	6	4.76%
3.9.0.1	4	3.17%
3.8.0.1	4	3.17%
1.0	3	2.38%
4.0.0.1	3	2.38%
4.1.0.1	3	2.38%
3.7.7.3	2	1.59%
3.9.5.3	2	1.59%
3.8.1.1	2	1.59%
3.8.1.5	2	1.59%
Other	10	7.94%
Kerio (70 servers)
Version	Number of Servers	Percent
6.7.3	15	21.43%
6.7.0	13	18.57%
6.6.2	7	10.00%
6.7.1	5	7.14%
6.6.1	5	7.14%
6.5.2	5	7.14%
6.5.0	4	5.71%
6.7.2	4	5.71%
6.3.0	2	2.86%
5.7.6	2	2.86%
6.5.1	2	2.86%
6.3.1	1	1.43%
6.4.1	1	1.43%
6.0.10	1	1.43%
5.7.9	1	1.43%
6.0.5	1	1.43%
6.0.8	1	1.43%
Other	0	0.00%
Merak (69 servers)
Version	Number of Servers	Percent
8.9.1	18	26.09%
8.0.3	17	24.64%
7.6.1	7	10.14%
7.4.5	4	5.80%
8.3.8	4	5.80%
7.6.4	2	2.90%
9.0.3	2	2.90%
8.0.1	1	1.45%
7.4.2	1	1.45%
8.9.2	1	1.45%
8.3.6	1	1.45%
6.1.0	1	1.45%
8.3.0	1	1.45%
4.2.1	1	1.45%
8.9.7	1	1.45%
7.6.0	1	1.45%
7.4.4	1	1.45%
6.0.8	1	1.45%
6.0.7	1	1.45%
7.0.1	1	1.45%
8.9.0	1	1.45%
5.8.2	1	1.45%
Other	0	0.00%
Post.Office (56 servers)
Version	Number of Servers	Percent
4.4	15	26.79%
4.3	11	19.64%
4.2.2	9	16.07%
3.5.3	6	10.71%
4.1.2.4	5	8.93%
4.2.1.1	2	3.57%
3.9.2	1	1.79%
4.2	1	1.79%
4.1.1	1	1.79%
3.5.3J	1	1.79%
3.5.1	1	1.79%
4.2.1.3	1	1.79%
4.1	1	1.79%
3.1.2	1	1.79%
Other	0	0.00%
ArGoSoft (46 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	13	28.26%
1.8 (1.8.9.5)	6	13.04%
1.8 (1.8.9.3)	5	10.87%
1.8 (1.8.9.1)	3	6.52%
1.8 (1.8.8.8)	2	4.35%
1.8 (1.8.7.3)	2	4.35%
1.8 (1.8.8.9)	2	4.35%
1.8 (1.8.7.6)	2	4.35%
1.8 (1.8.9.2)	2	4.35%
1.8 (1.8.2.1)	2	4.35%
1.8 (1.8.8.7)	1	2.17%
1.8 (1.8.5.8)	1	2.17%
1.8 (1.8.8.4)	1	2.17%
1.8 (1.8.6.0)	1	2.17%
1.8 (1.8.9.4)	1	2.17%
1.8 (1.8.3.5)	1	2.17%
1.8 (1.8.2.5)	1	2.17%
Other	0	0.00%
GroupWise (40 servers)
Version	Number of Servers	Percent
18.3.1	9	22.50%
18.4.0	6	15.00%
18.2.1	5	12.50%
18.1.1	4	10.00%
18.2.0	3	7.50%
18.1.0	2	5.00%
14.2.2	2	5.00%
18.0.2	2	5.00%
6.5.7	1	2.50%
14.2.1	1	2.50%
18.0.0	1	2.50%
6.5.0	1	2.50%
14.2.0	1	2.50%
8.0.3	1	2.50%
14.0.0	1	2.50%
Other	0	0.00%
Gordano Messaging Suite (GMS) (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
OpenVMS (9 servers)
Version	Number of Servers	Percent
8.4	6	66.67%
7.3	3	33.33%
Other	0	0.00%
Trend Micro (6 servers)
Version	Number of Servers	Percent
5.18	3	50.00%
5.7	1	16.67%
5.5	1	16.67%
7.0	1	16.67%
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%
InterScan VirusWall (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
WebSTAR V (2 servers)
Version	Number of Servers	Percent
5.4.1	1	50.00%
5.3.2	1	50.00%
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%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%