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	1,162,055	100.0%
Number of Servers that didn't respond	219,117	18.86%
Server didn't open socket	216,302	18.61%
Server didn't provide banner	2,815	0.24%
Server provided banner	942,938	81.14%
Server banner identifies software in use	602,048	51.81%

As indicated by the above table, of the 1,162,055 servers queried, only 602,048 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	342,337	56.86%
Postfix	220,810	36.68%
Sendmail	20,067	3.33%
MailEnable	11,130	1.85%
MDaemon	2,750	0.46%
Microsoft	1,434	0.24%
CommuniGate Pro	771	0.13%
OpenSMTPD	486	0.08%
IMail	479	0.08%
XMail	438	0.07%
SurgeSMTP	319	0.05%
Qmail Toaster	217	0.04%
WinWebMail	162	0.03%
MagicMail	155	0.03%
Lotus Domino	155	0.03%
Kerio	73	0.01%
Post.Office	72	0.01%
Merak	61	0.01%
GroupWise	40	0.01%
ArGoSoft	37	0.01%
Gordano Messaging Suite (GMS)	25	0.00%
OpenVMS	7	0.00%
Trend Micro	6	0.00%
InterScan VirusWall	6	0.00%
VisNetic	3	0.00%
Mercury	2	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (342,337 servers)
Version	Number of Servers	Percent
4.96	249,197	72.79%
4.95	39,027	11.40%
4.94.2	14,255	4.16%
4.93	12,481	3.65%
4.92	4,894	1.43%
Other	22,483	6.57%
Postfix (220,810 servers)
Version	Number of Servers	Percent
Other	220,810	100.00%
Sendmail (20,067 servers)
Version	Number of Servers	Percent
8.16.1	6,334	31.56%
8.15.2	5,638	28.10%
8.14.7	2,287	11.40%
8.14.4	1,964	9.79%
8.13.8	955	4.76%
8.14.5	785	3.91%
8.17.1	424	2.11%
8.13.1	296	1.48%
8.14.9	281	1.40%
Other	1,103	5.50%
MailEnable (11,130 servers)
Version	Number of Servers	Percent
10.46--	2,418	21.73%
10.43--	2,312	20.77%
10.34--	647	5.81%
10.27--	414	3.72%
10.25--	350	3.14%
10.42--	247	2.22%
10.45--	225	2.02%
10.43-10.43-	206	1.85%
9.00--	192	1.73%
10.47--10.47	146	1.31%
Other	3,973	35.70%
MDaemon (2,750 servers)
Version	Number of Servers	Percent
23.0.2	455	16.55%
23.0.1	166	6.04%
13.5.1	149	5.42%
19.5.4	104	3.78%
13.0.5	103	3.75%
13.0.4	95	3.45%
11.0.0	92	3.35%
11.0.3	89	3.24%
16.5.2	69	2.51%
14.5.2	63	2.29%
22.0.3	61	2.22%
21.5.2	51	1.85%
12.5.6	48	1.75%
21.5.4	43	1.56%
19.5.5	40	1.45%
23.0.0	38	1.38%
10.0.0	35	1.27%
12.5.4	31	1.13%
21.5.3	28	1.02%
Other	990	36.00%
Microsoft (1,434 servers)
Version	Number of Servers	Percent
6.0.3790.4675	396	27.62%
10.0.17763.1697	225	15.69%
8.5.9600.16384	184	12.83%
10.0.14393.4169	170	11.85%
7.5.7601.17514	103	7.18%
6.0.3790.3959	86	6.00%
5.0.2195.5329	60	4.18%
8.0.9200.16384	33	2.30%
5.0.2195.6713	25	1.74%
6.0.3790.1830	16	1.12%
7.0.6002.18264	15	1.05%
10.0.17763.1	15	1.05%
Other	106	7.39%
CommuniGate Pro (771 servers)
Version	Number of Servers	Percent
6.2.15	77	9.99%
6.2.14	60	7.78%
6.3.17	34	4.41%
6.1.20	30	3.89%
6.4.0	26	3.37%
6.3.18	25	3.24%
6.3.19	21	2.72%
6.3.20	17	2.20%
5.4.11	16	2.08%
6.0.11	14	1.82%
6.1.18	14	1.82%
5.2.20	13	1.69%
6.3.16	13	1.69%
6.0.9	12	1.56%
6.1.16	12	1.56%
6.2.12	12	1.56%
5.1.16	11	1.43%
7.1.4	11	1.43%
6.3.14	10	1.30%
6.3.6	10	1.30%
6.4.1	10	1.30%
7.1.1	9	1.17%
7.1.2	8	1.04%
Other	306	39.69%
OpenSMTPD (486 servers)
Version	Number of Servers	Percent
Other	486	100.00%
IMail (479 servers)
Version	Number of Servers	Percent
12.5.6.101	41	8.56%
12.5.8.41	41	8.56%
12.6.0.17	33	6.89%
12.5.7.59	30	6.26%
9.23	29	6.05%
12.4.1.15	29	6.05%
12.5.8.54	23	4.80%
12.5.8.58	22	4.59%
8.05	21	4.38%
12.5.8.59	20	4.18%
12.5.5.115	20	4.18%
12.5.6.105	20	4.18%
12.5.3.93	19	3.97%
8.22	18	3.76%
12.3.0.100	13	2.71%
12.5.4.146	11	2.30%
12.6.0.19	8	1.67%
12.6.0.20	7	1.46%
8.15	7	1.46%
11.5	7	1.46%
8.00	5	1.04%
10.02	5	1.04%
Other	50	10.44%
XMail (438 servers)
Version	Number of Servers	Percent
1.27	253	57.76%
1.22	121	27.63%
1.26	17	3.88%
1.25	17	3.88%
1.24	13	2.97%
1.15	6	1.37%
Other	11	2.51%
SurgeSMTP (319 servers)
Version	Number of Servers	Percent
7.7c-1	62	19.44%
7.6j-1	28	8.78%
7.3o4-4	23	7.21%
7.6u-1	22	6.90%
7.5c-1	15	4.70%
7.3e2-2	14	4.39%
7.4o-1	11	3.45%
7.1e-1	10	3.13%
7.5a-1	10	3.13%
7.6s-1	10	3.13%
7.6d-1	10	3.13%
7.6h-2	9	2.82%
7.7g-1	9	2.82%
7.4e-1	8	2.51%
6.5a2-2	7	2.19%
6.9c-1	7	2.19%
6.7c-1	5	1.57%
7.2i-1	5	1.57%
7.3i2-2	4	1.25%
Other	50	15.67%
Qmail Toaster (217 servers)
Version	Number of Servers	Percent
1.03	117	53.92%
1.3	93	42.86%
1.03.5	4	1.84%
Other	3	1.38%
WinWebMail (162 servers)
Version	Number of Servers	Percent
4.4.0.1	29	17.90%
3.9.0.7	20	12.35%
3.8.1.3	19	11.73%
4.2.0.1	17	10.49%
4.3.0.1	10	6.17%
4.1.0.1	7	4.32%
3.8.0.1	7	4.32%
3.9.0.1	6	3.70%
4.5.0.1	6	3.70%
4.0.0.1	6	3.70%
3.8.6.1	6	3.70%
3.7.3.1	5	3.09%
3.9.3.1	3	1.85%
3.7.1.1	3	1.85%
3.8.1.1	3	1.85%
3.7.7.3	2	1.23%
3.8.5.1	2	1.23%
3.8.1.5	2	1.23%
Other	9	5.56%
MagicMail (155 servers)
Version	Number of Servers	Percent
Other	155	100.00%
Lotus Domino (155 servers)
Version	Number of Servers	Percent
8.5.3FP6	27	17.42%
8.5.3	24	15.48%
8.5.1	10	6.45%
7.0	7	4.52%
8.5.2	7	4.52%
7.0.2	6	3.87%
7.0.3	5	3.23%
8.5	5	3.23%
8.5.2FP1	4	2.58%
6.5	4	2.58%
8.0	4	2.58%
6.5.1	4	2.58%
8.5.3FP3	4	2.58%
8.5.1FP5	3	1.94%
8.5.2FP2	3	1.94%
8.0.1	3	1.94%
7.0.3FP1	3	1.94%
8.5.3FP1	2	1.29%
6.5.2	2	1.29%
5.0.13a	2	1.29%
6.5.4	2	1.29%
8.5.2FP3	2	1.29%
6.5.3	2	1.29%
8.5.3FP5	2	1.29%
Other	18	11.61%
Kerio (73 servers)
Version	Number of Servers	Percent
6.7.3	15	20.55%
6.7.0	13	17.81%
6.6.1	8	10.96%
6.6.2	6	8.22%
6.7.1	5	6.85%
6.5.2	5	6.85%
6.7.2	4	5.48%
6.5.0	3	4.11%
5.7.9	2	2.74%
6.4.1	2	2.74%
6.3.1	2	2.74%
6.5.1	2	2.74%
6.0.3	1	1.37%
6.0.8	1	1.37%
5.7.6	1	1.37%
6.6.0	1	1.37%
6.4.0	1	1.37%
6.3.0	1	1.37%
Other	0	0.00%
Post.Office (72 servers)
Version	Number of Servers	Percent
4.4	28	38.89%
4.2.2	12	16.67%
4.3	10	13.89%
3.5.3	5	6.94%
4.1.2.4	4	5.56%
3.5.1	3	4.17%
3.9.2	2	2.78%
4.2	2	2.78%
4.2.1.3	2	2.78%
4.0.1	1	1.39%
4.1	1	1.39%
3.1.2	1	1.39%
4.2.1.1	1	1.39%
Other	0	0.00%
Merak (61 servers)
Version	Number of Servers	Percent
8.9.1	16	26.23%
8.0.3	16	26.23%
7.6.1	8	13.11%
8.3.8	5	8.20%
7.4.5	3	4.92%
8.0.1	1	1.64%
8.9.2	1	1.64%
8.3.6	1	1.64%
6.1.0	1	1.64%
7.6.4	1	1.64%
8.5.0	1	1.64%
7.5.2	1	1.64%
4.2.1	1	1.64%
7.6.0	1	1.64%
7.4.4	1	1.64%
6.0.8	1	1.64%
7.0.1	1	1.64%
5.8.2	1	1.64%
Other	0	0.00%
GroupWise (40 servers)
Version	Number of Servers	Percent
18.3.1	9	22.50%
18.2.1	6	15.00%
18.5.0	5	12.50%
18.4.2	3	7.50%
18.1.1	2	5.00%
18.2.0	2	5.00%
14.2.2	2	5.00%
6.5.7	1	2.50%
14.2.1	1	2.50%
14.2.3	1	2.50%
18.0.0	1	2.50%
6.5.0	1	2.50%
18.4.1	1	2.50%
18.3.0	1	2.50%
18.1.0	1	2.50%
7.0.4	1	2.50%
14.0.0	1	2.50%
18.0.2	1	2.50%
Other	0	0.00%
ArGoSoft (37 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	37.84%
1.8 (1.8.9.3)	3	8.11%
1.8 (1.8.9.1)	3	8.11%
1.8 (1.8.8.8)	2	5.41%
1.8 (1.8.9.2)	2	5.41%
1.8 (1.8.9.5)	2	5.41%
1.8 (1.8.6.1)	1	2.70%
1.8 (1.8.7.3)	1	2.70%
1.8 (1.8.1.7)	1	2.70%
1.8 (1.8.7.6)	1	2.70%
1.8 (1.8.8.4)	1	2.70%
1.8 (1.8.6.0)	1	2.70%
1.8 (1.8.8.7)	1	2.70%
1.8 (1.8.5.9)	1	2.70%
1.8 (1.8.9.4)	1	2.70%
1.8 (1.8.3.5)	1	2.70%
1.8 (1.8.8.9)	1	2.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (25 servers)
Version	Number of Servers	Percent
Other	25	100.00%
OpenVMS (7 servers)
Version	Number of Servers	Percent
8.4	4	57.14%
7.3	2	28.57%
8.2	1	14.29%
Other	0	0.00%
Trend Micro (6 servers)
Version	Number of Servers	Percent
5.18	3	50.00%
5.5	2	33.33%
5.7	1	16.67%
Other	0	0.00%
InterScan VirusWall (6 servers)
Version	Number of Servers	Percent
Other	6	100.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
9.3.2.0	2	66.67%
8.0.3	1	33.33%
Other	0	0.00%
Mercury (2 servers)
Version	Number of Servers	Percent
4.x	1	50.00%
1.48	1	50.00%
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 (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%