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	1,054,188	100.0%
Number of Servers that didn't respond	217,490	20.63%
Server didn't open socket	215,094	20.40%
Server didn't provide banner	2,396	0.23%
Server provided banner	836,698	79.37%
Server banner identifies software in use	520,323	49.36%

As indicated by the above table, of the 1,054,188 servers queried, only 520,323 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	291,401	56.00%
Postfix	194,844	37.45%
Sendmail	18,352	3.53%
MailEnable	9,587	1.84%
MDaemon	2,059	0.40%
Microsoft	1,062	0.20%
CommuniGate Pro	639	0.12%
OpenSMTPD	582	0.11%
XMail	410	0.08%
IMail	288	0.06%
SurgeSMTP	285	0.05%
Qmail Toaster	168	0.03%
WinWebMail	151	0.03%
MagicMail	147	0.03%
Lotus Domino	92	0.02%
Post.Office	58	0.01%
Merak	48	0.01%
Kerio	47	0.01%
ArGoSoft	32	0.01%
GroupWise	29	0.01%
Gordano Messaging Suite (GMS)	13	0.00%
OpenVMS	9	0.00%
InterScan VirusWall	5	0.00%
ModusMail	4	0.00%
VisNetic	3	0.00%
Trend Micro	3	0.00%
MessageWall	2	0.00%
Mercury	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (291,401 servers)
Version	Number of Servers	Percent
4.98.1	192,436	66.04%
4.96.2	36,056	12.37%
4.98	9,677	3.32%
4.96	7,748	2.66%
4.97.1	6,942	2.38%
4.93	5,969	2.05%
4.95	5,083	1.74%
4.94.2	4,950	1.70%
4.98.2	4,318	1.48%
Other	18,222	6.25%
Postfix (194,844 servers)
Version	Number of Servers	Percent
Other	194,844	100.00%
Sendmail (18,352 servers)
Version	Number of Servers	Percent
8.16.1	7,828	42.65%
8.15.2	3,772	20.55%
8.14.7	1,685	9.18%
8.14.4	1,429	7.79%
8.18.1	878	4.78%
8.13.8	665	3.62%
8.14.5	548	2.99%
8.14.9	234	1.28%
8.17.1	211	1.15%
8.17.1.9	202	1.10%
Other	900	4.90%
MailEnable (9,587 servers)
Version	Number of Servers	Percent
10.50--	1,857	19.37%
10.49--	1,544	16.11%
10.46--	1,029	10.73%
10.48--	515	5.37%
10.34--	291	3.04%
10.43--	201	2.10%
10.47--	181	1.89%
10.25--	173	1.80%
10.27--	165	1.72%
10.43-10.43-	160	1.67%
10.51--	129	1.35%
10.48--10.48	110	1.15%
10.47--10.47	102	1.06%
10.42--	100	1.04%
9.00--	96	1.00%
Other	2,934	30.60%
MDaemon (2,059 servers)
Version	Number of Servers	Percent
24.5.2	224	10.88%
25.0.0	209	10.15%
19.5.4	94	4.57%
13.5.1	83	4.03%
11.0.0	72	3.50%
13.0.4	69	3.35%
13.0.5	63	3.06%
11.0.3	62	3.01%
25.0.1	47	2.28%
16.5.2	47	2.28%
14.5.2	40	1.94%
12.5.6	35	1.70%
23.0.2	35	1.70%
24.5.1	34	1.65%
23.0.1	30	1.46%
21.5.5	25	1.21%
10.1.2	22	1.07%
Other	868	42.16%
Microsoft (1,062 servers)
Version	Number of Servers	Percent
6.0.3790.4675	267	25.14%
10.0.17763.1697	211	19.87%
10.0.14393.4169	124	11.68%
8.5.9600.16384	105	9.89%
7.5.7601.17514	73	6.87%
6.0.3790.3959	60	5.65%
5.0.2195.5329	48	4.52%
10.0.20348.1	41	3.86%
8.0.9200.16384	22	2.07%
5.0.2195.6713	21	1.98%
6.0.3790.1830	15	1.41%
Other	75	7.06%
CommuniGate Pro (639 servers)
Version	Number of Servers	Percent
6.2.15	54	8.45%
6.3.39	44	6.89%
6.2.14	43	6.73%
6.1.20	26	4.07%
6.4.1	25	3.91%
6.3.20	21	3.29%
6.4.0	20	3.13%
6.3.17	19	2.97%
6.3.18	17	2.66%
5.4.11	12	1.88%
6.2.12	11	1.72%
5.2.20	11	1.72%
5.1.16	11	1.72%
6.1.16	11	1.72%
6.0.11	10	1.56%
6.3.14	9	1.41%
7.1.10	9	1.41%
6.1.18	8	1.25%
6.1.17	7	1.10%
7.1.8	7	1.10%
Other	264	41.31%
OpenSMTPD (582 servers)
Version	Number of Servers	Percent
Other	582	100.00%
XMail (410 servers)
Version	Number of Servers	Percent
1.27	276	67.32%
1.22	90	21.95%
1.26	15	3.66%
1.25	10	2.44%
1.24	8	1.95%
Other	11	2.68%
IMail (288 servers)
Version	Number of Servers	Percent
12.6.1.4	49	17.01%
9.23	26	9.03%
12.5.6.101	21	7.29%
12.5.8.59	19	6.60%
12.5.8.41	15	5.21%
12.5.6.105	15	5.21%
12.5.7.59	14	4.86%
12.5.3.93	14	4.86%
8.05	12	4.17%
8.22	11	3.82%
12.5.8.58	10	3.47%
12.5.4.146	7	2.43%
12.5.5.115	6	2.08%
12.3.0.100	6	2.08%
7.07	5	1.74%
12.5.5.117	5	1.74%
11.5	5	1.74%
8.00	4	1.39%
12.4.1.15	4	1.39%
12.5.8.54	3	1.04%
8.21	3	1.04%
6.04	3	1.04%
12.6.0.17	3	1.04%
10.02	3	1.04%
Other	25	8.68%
SurgeSMTP (285 servers)
Version	Number of Servers	Percent
7.8k-1	64	22.46%
7.8a-1	25	8.77%
7.8g-1	21	7.37%
7.3o4-4	20	7.02%
7.3e2-2	12	4.21%
7.7c-1	12	4.21%
7.6j-1	12	4.21%
7.5c-1	11	3.86%
7.8c2-2	9	3.16%
7.1e-1	8	2.81%
6.9c-1	8	2.81%
7.5a-1	6	2.11%
7.2i-1	5	1.75%
6.5a2-2	5	1.75%
7.4o-1	4	1.40%
7.7i-1	4	1.40%
7.8h-10	4	1.40%
7.4e-1	4	1.40%
7.4m-1	3	1.05%
6.5a-1	3	1.05%
7.8l-7	3	1.05%
Other	42	14.74%
Qmail Toaster (168 servers)
Version	Number of Servers	Percent
1.03	112	66.67%
1.3	50	29.76%
1.03.5	4	2.38%
1.03.6	2	1.19%
Other	0	0.00%
WinWebMail (151 servers)
Version	Number of Servers	Percent
4.5.0.1	32	21.19%
3.8.1.3	17	11.26%
4.4.0.1	17	11.26%
4.2.0.1	17	11.26%
3.9.0.7	12	7.95%
3.9.0.1	6	3.97%
3.8.0.1	5	3.31%
4.1.0.1	5	3.31%
4.0.0.1	4	2.65%
4.3.0.1	4	2.65%
3.7.7.3	3	1.99%
3.7.1.1	3	1.99%
3.7.3.1	3	1.99%
3.9.3.1	2	1.32%
3.7.6.1	2	1.32%
3.8.1.5	2	1.32%
3.8.5.1	2	1.32%
3.9.2.1	2	1.32%
3.9.5.3	2	1.32%
3.8.6.1	2	1.32%
3.8.1.1	2	1.32%
Other	7	4.64%
MagicMail (147 servers)
Version	Number of Servers	Percent
Other	147	100.00%
Lotus Domino (92 servers)
Version	Number of Servers	Percent
8.5.3FP6	18	19.57%
8.5.3	13	14.13%
8.5.2	5	5.43%
7.0	4	4.35%
8.5.2FP1	4	4.35%
6.5	4	4.35%
8.5.1	4	4.35%
8.5	4	4.35%
6.5.1	3	3.26%
8.5.3FP3	3	3.26%
7.0.2	3	3.26%
8.0	3	3.26%
6.5.2	2	2.17%
7.5.1	2	2.17%
7.0.3	2	2.17%
8.0.1	2	2.17%
8.5.3FP2	1	1.09%
8.5.3FP6HF1215	1	1.09%
6.5.3	1	1.09%
6.0.1	1	1.09%
5.0.13a	1	1.09%
6.0	1	1.09%
5.0.8	1	1.09%
6.5.5	1	1.09%
8.5.3FP1	1	1.09%
5.0.5	1	1.09%
8.5.3FP5	1	1.09%
7.0.4FP2	1	1.09%
8.5.2FP4	1	1.09%
6.6.6	1	1.09%
8.5.1FP2	1	1.09%
7.0.3FP1	1	1.09%
Other	0	0.00%
Post.Office (58 servers)
Version	Number of Servers	Percent
4.4	26	44.83%
4.2.2	10	17.24%
4.3	5	8.62%
3.5.3	5	8.62%
4.1.2.4	3	5.17%
3.5.1	3	5.17%
3.9.2	2	3.45%
4.2	1	1.72%
3.1.2	1	1.72%
4.2.1.1	1	1.72%
4.2.1.3	1	1.72%
Other	0	0.00%
Merak (48 servers)
Version	Number of Servers	Percent
8.9.1	16	33.33%
8.0.3	11	22.92%
7.6.1	8	16.67%
7.4.5	2	4.17%
8.3.8	2	4.17%
8.0.1	1	2.08%
8.9.2	1	2.08%
6.1.0	1	2.08%
8.5.0	1	2.08%
7.5.2	1	2.08%
7.6.0	1	2.08%
7.4.4	1	2.08%
6.0.8	1	2.08%
5.8.2	1	2.08%
Other	0	0.00%
Kerio (47 servers)
Version	Number of Servers	Percent
6.7.3	13	27.66%
6.6.1	7	14.89%
6.6.2	4	8.51%
6.7.0	4	8.51%
6.5.2	4	8.51%
6.7.1	3	6.38%
6.7.2	3	6.38%
6.5.1	2	4.26%
6.6.0	2	4.26%
6.0.8	1	2.13%
5.7.6	1	2.13%
6.4.1	1	2.13%
6.5.0	1	2.13%
6.3.0	1	2.13%
Other	0	0.00%
ArGoSoft (32 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	34.38%
1.8 (1.8.9.3)	5	15.62%
1.8 (1.8.9.5)	4	12.50%
1.8 (1.8.9.1)	3	9.38%
1.8 (1.8.9.2)	2	6.25%
1.8 (1.8.8.8)	1	3.12%
1.8 (1.8.7.3)	1	3.12%
1.8 (1.8.3.5)	1	3.12%
1.8 (1.8.8.7)	1	3.12%
1.8 (1.8.9.4)	1	3.12%
1.8 (1.8.1.7)	1	3.12%
1.8 (1.8.8.9)	1	3.12%
Other	0	0.00%
GroupWise (29 servers)
Version	Number of Servers	Percent
24.4.0	7	24.14%
18.3.1	4	13.79%
18.2.1	3	10.34%
18.1.1	2	6.90%
18.5.0	2	6.90%
24.3.0	2	6.90%
14.2.1	1	3.45%
24.1.0	1	3.45%
7.0.3	1	3.45%
18.4.1	1	3.45%
18.2.0	1	3.45%
18.3.0	1	3.45%
18.0.2	1	3.45%
24.2.0	1	3.45%
14.0.0	1	3.45%
Other	0	0.00%
Gordano Messaging Suite (GMS) (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
OpenVMS (9 servers)
Version	Number of Servers	Percent
8.4	6	66.67%
7.3	2	22.22%
8.2	1	11.11%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
ModusMail (4 servers)
Version	Number of Servers	Percent
4.1.361.21	4	100.00%
Other	0	0.00%
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%
Trend Micro (3 servers)
Version	Number of Servers	Percent
5.18	2	66.67%
5.5	1	33.33%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
4.x	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%