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	960,243	100.0%
Number of Servers that didn't respond	142,385	14.83%
Server didn't open socket	139,923	14.57%
Server didn't provide banner	2,462	0.26%
Server provided banner	817,858	85.17%
Server banner identifies software in use	535,368	55.75%

As indicated by the above table, of the 960,243 servers queried, only 535,368 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	326,241	60.94%
Postfix	169,858	31.73%
Sendmail	19,599	3.66%
MailEnable	11,188	2.09%
MDaemon	3,335	0.62%
Microsoft	1,714	0.32%
CommuniGate Pro	687	0.13%
IMail	531	0.10%
Qmail Toaster	454	0.08%
XMail	431	0.08%
SurgeSMTP	282	0.05%
OpenSMTPD	212	0.04%
Lotus Domino	177	0.03%
WinWebMail	145	0.03%
MagicMail	119	0.02%
Kerio	96	0.02%
Merak	92	0.02%
Post.Office	64	0.01%
GroupWise	44	0.01%
ArGoSoft	41	0.01%
Gordano Messaging Suite (GMS)	21	0.00%
Trend Micro	13	0.00%
VisNetic	7	0.00%
OpenVMS	4	0.00%
InterScan VirusWall	3	0.00%
Mercury	2	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
WebSTAR V	2	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (326,241 servers)
Version	Number of Servers	Percent
4.93	235,013	72.04%
4.92	18,602	5.70%
4.91	15,085	4.62%
4.94	11,356	3.48%
4.92.3	8,624	2.64%
4.93.0.4	7,354	2.25%
4.87	4,896	1.50%
4.89	4,892	1.50%
4.84	4,007	1.23%
Other	16,412	5.03%
Postfix (169,858 servers)
Version	Number of Servers	Percent
Other	169,858	100.00%
Sendmail (19,599 servers)
Version	Number of Servers	Percent
8.15.2	9,675	49.36%
8.14.4	3,027	15.44%
8.14.7	1,666	8.50%
8.13.8	1,515	7.73%
8.14.5	1,392	7.10%
8.14.9	614	3.13%
8.13.1	425	2.17%
8.14.3	288	1.47%
Other	997	5.09%
MailEnable (11,188 servers)
Version	Number of Servers	Percent
10.25--	2,610	23.33%
10.27--	2,429	21.71%
9.00--	469	4.19%
10.29--	286	2.56%
10.30--	259	2.31%
10.12--	185	1.65%
9.16--	165	1.47%
10.30--10.30	158	1.41%
8.60--	143	1.28%
9.00--9.00	129	1.15%
10.30-10.30-	121	1.08%
10.29-10.29-	118	1.05%
Other	4,116	36.79%
MDaemon (3,335 servers)
Version	Number of Servers	Percent
19.5.5	564	16.91%
13.5.1	242	7.26%
13.0.4	150	4.50%
13.0.5	148	4.44%
11.0.0	136	4.08%
11.0.3	132	3.96%
13.6.3	96	2.88%
16.5.2	93	2.79%
12.5.6	73	2.19%
12.5.4	72	2.16%
19.5.4	71	2.13%
14.5.2	62	1.86%
20.0.0	60	1.80%
19.5.3	43	1.29%
10.0.0	41	1.23%
10.1.2	40	1.20%
10.1.0	40	1.20%
15.0.3	35	1.05%
16.0.4	35	1.05%
19.0.3	35	1.05%
13.0.2	34	1.02%
Other	1,133	33.97%
Microsoft (1,714 servers)
Version	Number of Servers	Percent
6.0.3790.4675	704	41.07%
8.5.9600.16384	267	15.58%
7.5.7601.17514	185	10.79%
10.0.14393.2608	136	7.93%
6.0.3790.3959	90	5.25%
5.0.2195.5329	73	4.26%
10.0.17763.1	53	3.09%
8.0.9200.16384	35	2.04%
5.0.2195.6713	30	1.75%
6.0.3790.1830	24	1.40%
7.0.6002.18264	20	1.17%
Other	97	5.66%
CommuniGate Pro (687 servers)
Version	Number of Servers	Percent
6.2.14	73	10.63%
6.2.15	44	6.40%
6.1.20	29	4.22%
6.2.12	25	3.64%
5.3.13	24	3.49%
6.1.16	21	3.06%
5.2.20	21	3.06%
6.0.11	20	2.91%
6.1.18	20	2.91%
5.4.11	18	2.62%
6.2.13	17	2.47%
5.1.16	17	2.47%
6.0.9	15	2.18%
6.0.7	9	1.31%
6.2.10	9	1.31%
6.1.12	8	1.16%
6.1.9	8	1.16%
6.2.7	8	1.16%
4.2.10	7	1.02%
6.1.10	7	1.02%
6.2.9	7	1.02%
6.2.1	7	1.02%
Other	273	39.74%
IMail (531 servers)
Version	Number of Servers	Percent
12.5.6.101	67	12.62%
12.5.7.59	64	12.05%
12.5.8.41	62	11.68%
12.4.1.15	44	8.29%
9.23	29	5.46%
12.5.3.93	29	5.46%
8.22	28	5.27%
12.3.0.100	26	4.90%
12.5.5.115	23	4.33%
8.15	23	4.33%
8.05	20	3.77%
12.5.4.146	13	2.45%
12.5.5.117	12	2.26%
10.02	11	2.07%
12.5.6.105	10	1.88%
11.5	8	1.51%
11.03	6	1.13%
Other	56	10.55%
Qmail Toaster (454 servers)
Version	Number of Servers	Percent
1.3	352	77.53%
1.03	89	19.60%
1.03.5	6	1.32%
Other	7	1.54%
XMail (431 servers)
Version	Number of Servers	Percent
1.27	210	48.72%
1.22	150	34.80%
1.26	23	5.34%
1.25	19	4.41%
1.24	10	2.32%
1.15	5	1.16%
Other	14	3.25%
SurgeSMTP (282 servers)
Version	Number of Servers	Percent
7.3o4-4	60	21.28%
7.4o-1	28	9.93%
7.3e2-2	27	9.57%
7.4e-1	23	8.16%
7.1e-1	17	6.03%
7.3i2-2	12	4.26%
6.5a2-2	11	3.90%
3.9e-1	8	2.84%
7.4m-1	7	2.48%
6.7c-1	7	2.48%
7.2a-1	7	2.48%
7.4g-1	5	1.77%
6.5a-1	4	1.42%
7.4p-9	4	1.42%
6.9c-1	4	1.42%
7.2e-2	3	1.06%
7.0c2-2	3	1.06%
5.2a-1	3	1.06%
7.2i-1	3	1.06%
7.4p-18	3	1.06%
7.4f-2	3	1.06%
Other	40	14.18%
OpenSMTPD (212 servers)
Version	Number of Servers	Percent
Other	212	100.00%
Lotus Domino (177 servers)
Version	Number of Servers	Percent
8.5.3	32	18.08%
8.5.3FP6	30	16.95%
7.0	9	5.08%
8.5.2	9	5.08%
7.0.2	8	4.52%
8.5.2FP2	7	3.95%
8.5.1	6	3.39%
7.0.3	5	2.82%
8.5.3FP4	5	2.82%
8.5.3FP5	4	2.26%
8.5.3FP1	4	2.26%
6.5.4	3	1.69%
8.5.1FP5	3	1.69%
5.0.8	3	1.69%
8.5.2FP3	3	1.69%
8.0.1	3	1.69%
6.5	2	1.13%
8.5.2FP1	2	1.13%
8.0.2	2	1.13%
5.0.13	2	1.13%
8.5	2	1.13%
8.5.1FP4	2	1.13%
8.0	2	1.13%
8.5.3FP2	2	1.13%
8.5.2FP4	2	1.13%
7.0.3FP1	2	1.13%
7.5.1	2	1.13%
6.5.3	2	1.13%
7.0.4	2	1.13%
6.5.5	2	1.13%
Other	15	8.47%
WinWebMail (145 servers)
Version	Number of Servers	Percent
4.2.0.1	38	26.21%
3.9.0.7	31	21.38%
3.8.1.3	11	7.59%
3.8.0.1	7	4.83%
3.7.6.1	6	4.14%
3.8.6.1	6	4.14%
4.0.0.1	6	4.14%
3.8.5.1	4	2.76%
3.9.0.1	4	2.76%
3.9.2.1	4	2.76%
3.8.1.1	4	2.76%
3.8.1.5	4	2.76%
3.7.3.1	3	2.07%
3.8.3.1	3	2.07%
4.1.0.1	2	1.38%
3.9.5.3	2	1.38%
3.7.5.1	2	1.38%
Other	8	5.52%
MagicMail (119 servers)
Version	Number of Servers	Percent
Other	119	100.00%
Kerio (96 servers)
Version	Number of Servers	Percent
6.7.3	23	23.96%
6.7.0	15	15.62%
6.6.2	9	9.38%
6.7.1	8	8.33%
6.6.1	8	8.33%
6.7.2	7	7.29%
6.5.0	6	6.25%
6.5.2	5	5.21%
5.7.9	2	2.08%
5.7.6	2	2.08%
6.5.1	2	2.08%
6.4.1	1	1.04%
6.0.10	1	1.04%
6.4.0	1	1.04%
6.3.1	1	1.04%
6.0.8	1	1.04%
6.6.0	1	1.04%
6.0.6	1	1.04%
6.1.3	1	1.04%
6.1.0	1	1.04%
Other	0	0.00%
Merak (92 servers)
Version	Number of Servers	Percent
8.0.3	23	25.00%
8.9.1	22	23.91%
7.6.1	10	10.87%
8.5.0	6	6.52%
7.4.5	6	6.52%
8.3.8	4	4.35%
9.0.3	4	4.35%
7.6.0	2	2.17%
6.0.8	2	2.17%
8.0.1	1	1.09%
8.9.2	1	1.09%
8.3.6	1	1.09%
4.4.1	1	1.09%
6.1.0	1	1.09%
7.5.2	1	1.09%
4.2.1	1	1.09%
5.8.2	1	1.09%
8.9.7	1	1.09%
7.6.4	1	1.09%
7.4.4	1	1.09%
7.0.1	1	1.09%
8.9.0	1	1.09%
Other	0	0.00%
Post.Office (64 servers)
Version	Number of Servers	Percent
4.3	17	26.56%
4.4	14	21.88%
4.2.2	14	21.88%
4.1.2.4	6	9.38%
3.5.3	3	4.69%
3.9.2	2	3.12%
4.1.1	2	3.12%
3.5.3J	1	1.56%
3.6.2	1	1.56%
4.1.0.3	1	1.56%
4.1	1	1.56%
3.1.2	1	1.56%
3.1.2J	1	1.56%
Other	0	0.00%
GroupWise (44 servers)
Version	Number of Servers	Percent
18.1.1	5	11.36%
18.2.0	4	9.09%
14.2.2	4	9.09%
18.2.1	4	9.09%
14.2.1	4	9.09%
14.2.3	3	6.82%
18.0.2	3	6.82%
18.1.0	3	6.82%
14.0.1	2	4.55%
14.2.0	2	4.55%
14.0.0	2	4.55%
18.0.0	2	4.55%
6.5.7	1	2.27%
6.5.0	1	2.27%
7.0.1	1	2.27%
7.0.2	1	2.27%
6.0.2	1	2.27%
8.0.2	1	2.27%
Other	0	0.00%
ArGoSoft (41 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	26.83%
1.8 (1.8.9.5)	7	17.07%
1.8 (1.8.9.3)	5	12.20%
1.8 (1.8.8.8)	2	4.88%
1.8 (1.8.7.3)	2	4.88%
1.8 (1.8.9.2)	2	4.88%
1.8 (1.8.2.1)	2	4.88%
1.8 (1.8.9.1)	2	4.88%
1.8 (1.8.6.1)	1	2.44%
1.8 (1.8.8.9)	1	2.44%
1.8 (1.8.8.7)	1	2.44%
1.8 (1.8.7.6)	1	2.44%
1.8 (1.8.5.8)	1	2.44%
1.8 (1.8.8.4)	1	2.44%
1.8 (1.8.9.4)	1	2.44%
1.8 (1.8.2.5)	1	2.44%
Other	0	0.00%
Gordano Messaging Suite (GMS) (21 servers)
Version	Number of Servers	Percent
Other	21	100.00%
Trend Micro (13 servers)
Version	Number of Servers	Percent
5.7	6	46.15%
7.5	4	30.77%
5.18	3	23.08%
Other	0	0.00%
VisNetic (7 servers)
Version	Number of Servers	Percent
9.3.2.0	5	71.43%
8.0.3	1	14.29%
6.2.2.0	1	14.29%
Other	0	0.00%
OpenVMS (4 servers)
Version	Number of Servers	Percent
8.4	2	50.00%
7.3	1	25.00%
8.3	1	25.00%
Other	0	0.00%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
Mercury (2 servers)
Version	Number of Servers	Percent
3.32	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%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.8-Build_1080	1	50.00%
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%
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%