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	833,473	100.0%
Number of Servers that didn't respond	132,054	15.84%
Server didn't open socket	128,129	15.37%
Server didn't provide banner	3,925	0.47%
Server provided banner	701,419	84.16%
Server banner identifies software in use	464,970	55.79%

As indicated by the above table, of the 833,473 servers queried, only 464,970 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	279,414	60.09%
Postfix	155,270	33.39%
Sendmail	16,049	3.45%
MailEnable	8,855	1.90%
MDaemon	1,973	0.42%
Microsoft	946	0.20%
CommuniGate Pro	558	0.12%
IMail	362	0.08%
XMail	321	0.07%
OpenSMTPD	282	0.06%
SurgeSMTP	239	0.05%
Qmail Toaster	176	0.04%
MagicMail	107	0.02%
Lotus Domino	92	0.02%
WinWebMail	82	0.02%
Merak	57	0.01%
Kerio	51	0.01%
Post.Office	46	0.01%
ArGoSoft	31	0.01%
GroupWise	26	0.01%
Gordano Messaging Suite (GMS)	10	0.00%
OpenVMS	6	0.00%
Trend Micro	5	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Neon Mail Server	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (279,414 servers)
Version	Number of Servers	Percent
4.95	206,235	73.81%
4.96	20,716	7.41%
4.94.2	15,803	5.66%
4.93	11,220	4.02%
4.92	4,135	1.48%
4.94	2,991	1.07%
Other	18,314	6.55%
Postfix (155,270 servers)
Version	Number of Servers	Percent
Other	155,270	100.00%
Sendmail (16,049 servers)
Version	Number of Servers	Percent
8.15.2	6,086	37.92%
8.16.1	3,800	23.68%
8.14.7	1,840	11.46%
8.14.4	1,638	10.21%
8.13.8	803	5.00%
8.14.5	434	2.70%
8.14.9	248	1.55%
8.17.1	246	1.53%
8.13.1	235	1.46%
Other	719	4.48%
MailEnable (8,855 servers)
Version	Number of Servers	Percent
10.42--	2,260	25.52%
10.34--	1,779	20.09%
10.27--	414	4.68%
10.25--	341	3.85%
9.00--	192	2.17%
10.43--10.43	156	1.76%
10.43--	155	1.75%
10.43-10.43-	136	1.54%
10.37--	130	1.47%
10.31--	115	1.30%
10.31-10.31-	103	1.16%
9.00--9.00	95	1.07%
10.39--	90	1.02%
Other	2,889	32.63%
MDaemon (1,973 servers)
Version	Number of Servers	Percent
22.0.3	251	12.72%
21.5.2	132	6.69%
13.5.1	122	6.18%
13.0.5	80	4.05%
22.0.2	74	3.75%
11.0.0	69	3.50%
11.0.3	67	3.40%
13.0.4	64	3.24%
14.5.2	48	2.43%
16.5.2	47	2.38%
19.5.4	45	2.28%
19.5.5	41	2.08%
12.5.6	38	1.93%
21.0.3	37	1.88%
22.0.0	26	1.32%
21.0.1	25	1.27%
21.5.1	25	1.27%
12.5.4	23	1.17%
21.5.0	23	1.17%
10.0.0	22	1.12%
9.6.6	22	1.12%
Other	692	35.07%
Microsoft (946 servers)
Version	Number of Servers	Percent
6.0.3790.4675	283	29.92%
8.5.9600.16384	137	14.48%
10.0.14393.4169	116	12.26%
10.0.17763.1697	99	10.47%
7.5.7601.17514	74	7.82%
5.0.2195.5329	48	5.07%
6.0.3790.3959	46	4.86%
8.0.9200.16384	23	2.43%
5.0.2195.6713	19	2.01%
7.0.6002.18264	13	1.37%
10.0.14393.0	11	1.16%
10.0.17763.1	11	1.16%
Other	66	6.98%
CommuniGate Pro (558 servers)
Version	Number of Servers	Percent
6.2.14	58	10.39%
6.2.15	56	10.04%
6.3.16	19	3.41%
6.1.20	19	3.41%
6.3.14	17	3.05%
6.0.11	14	2.51%
6.1.16	14	2.51%
6.3.15	13	2.33%
6.1.18	12	2.15%
6.0.9	12	2.15%
5.2.20	12	2.15%
5.4.11	10	1.79%
5.1.16	10	1.79%
6.3.13	10	1.79%
7.1.1	7	1.25%
6.2.12	7	1.25%
6.2.16	7	1.25%
6.3.6	6	1.08%
6.3.5	6	1.08%
6.1.19	6	1.08%
Other	243	43.55%
IMail (362 servers)
Version	Number of Servers	Percent
12.5.8.41	47	12.98%
12.5.6.101	35	9.67%
12.5.7.59	31	8.56%
9.23	26	7.18%
12.6.0.17	19	5.25%
12.5.8.58	19	5.25%
8.05	16	4.42%
12.5.8.59	16	4.42%
12.4.1.15	15	4.14%
12.5.3.93	14	3.87%
12.5.6.105	14	3.87%
8.22	12	3.31%
8.15	10	2.76%
12.3.0.100	10	2.76%
12.5.8.54	8	2.21%
10.02	7	1.93%
12.5.4.146	6	1.66%
12.5.5.115	5	1.38%
12.5.5.117	5	1.38%
11.5	4	1.10%
Other	43	11.88%
XMail (321 servers)
Version	Number of Servers	Percent
1.27	189	58.88%
1.22	83	25.86%
1.26	14	4.36%
1.25	14	4.36%
1.24	9	2.80%
1.15	6	1.87%
Other	6	1.87%
OpenSMTPD (282 servers)
Version	Number of Servers	Percent
Other	282	100.00%
SurgeSMTP (239 servers)
Version	Number of Servers	Percent
7.6j-1	36	15.06%
7.3o4-4	21	8.79%
7.6u-1	19	7.95%
7.5c-1	16	6.69%
7.3e2-2	15	6.28%
7.6s-1	15	6.28%
7.5a-1	11	4.60%
7.6h-2	9	3.77%
7.4o-1	8	3.35%
7.1e-1	7	2.93%
7.6d-1	7	2.93%
6.5a2-2	7	2.93%
6.7c-1	6	2.51%
7.4e-1	6	2.51%
7.6m-1	5	2.09%
7.3i2-2	4	1.67%
3.9e-1	3	1.26%
Other	44	18.41%
Qmail Toaster (176 servers)
Version	Number of Servers	Percent
1.03	86	48.86%
1.3	83	47.16%
1.03.5	5	2.84%
Other	2	1.14%
MagicMail (107 servers)
Version	Number of Servers	Percent
Other	107	100.00%
Lotus Domino (92 servers)
Version	Number of Servers	Percent
8.5.3	19	20.65%
8.5.3FP6	15	16.30%
7.0	5	5.43%
7.0.3	4	4.35%
8.5.2FP2	4	4.35%
8.5.1	4	4.35%
7.0.2	4	4.35%
6.5	2	2.17%
8.5.2FP1	2	2.17%
8.5.3FP1	2	2.17%
8.5.3FP4	2	2.17%
8.0	2	2.17%
6.5.1	2	2.17%
8.5.2FP3	2	2.17%
6.5.3	2	2.17%
7.0.4FP2	2	2.17%
7.0.3FP1	2	2.17%
8.5.3FP2	1	1.09%
8.5.3FP6HF1215	1	1.09%
6.5.4	1	1.09%
6.0.1	1	1.09%
8.5.3FP5	1	1.09%
8.5.1FP5	1	1.09%
5.0.13a	1	1.09%
8.5.2FP4	1	1.09%
8.5.2	1	1.09%
5.0.8	1	1.09%
8.0.1	1	1.09%
7.0.4FP1	1	1.09%
5.0.11	1	1.09%
8.5.1FP3	1	1.09%
6.5.2	1	1.09%
6.5.4FP2	1	1.09%
8.5.3FP3	1	1.09%
Other	0	0.00%
WinWebMail (82 servers)
Version	Number of Servers	Percent
4.4.0.1	16	19.51%
3.9.0.7	14	17.07%
4.2.0.1	12	14.63%
4.3.0.1	6	7.32%
3.8.6.1	5	6.10%
3.7.3.1	4	4.88%
3.8.0.1	4	4.88%
4.1.0.1	3	3.66%
3.8.1.3	3	3.66%
1.0	2	2.44%
3.8.5.1	2	2.44%
4.0.0.1	2	2.44%
3.8.3.1	1	1.22%
3.7.6.1	1	1.22%
3.9.3.1	1	1.22%
3.9.2.1	1	1.22%
3.7.7.3	1	1.22%
3.8.1.5	1	1.22%
3.8.1.6	1	1.22%
3.9.2.2	1	1.22%
3.7.5.1	1	1.22%
Other	0	0.00%
Merak (57 servers)
Version	Number of Servers	Percent
8.9.1	15	26.32%
8.0.3	15	26.32%
7.6.1	7	12.28%
8.3.8	4	7.02%
7.4.5	3	5.26%
8.0.1	1	1.75%
8.9.2	1	1.75%
6.1.0	1	1.75%
8.5.0	1	1.75%
9.0.3	1	1.75%
4.2.1	1	1.75%
8.9.7	1	1.75%
7.6.0	1	1.75%
7.4.4	1	1.75%
6.0.8	1	1.75%
7.0.1	1	1.75%
8.9.0	1	1.75%
5.8.2	1	1.75%
Other	0	0.00%
Kerio (51 servers)
Version	Number of Servers	Percent
6.7.3	11	21.57%
6.6.1	7	13.73%
6.6.2	6	11.76%
6.7.1	5	9.80%
6.7.0	5	9.80%
6.5.2	5	9.80%
5.7.9	2	3.92%
6.3.0	2	3.92%
6.7.2	2	3.92%
6.5.1	2	3.92%
6.0.10	1	1.96%
6.3.1	1	1.96%
6.0.8	1	1.96%
6.5.0	1	1.96%
Other	0	0.00%
Post.Office (46 servers)
Version	Number of Servers	Percent
4.4	14	30.43%
4.3	10	21.74%
4.2.2	10	21.74%
3.9.2	2	4.35%
4.2	2	4.35%
4.1.2.4	2	4.35%
3.5.3	2	4.35%
3.5.3J	1	2.17%
4.1	1	2.17%
3.1.2	1	2.17%
4.2.1.1	1	2.17%
Other	0	0.00%
ArGoSoft (31 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	9	29.03%
1.8 (1.8.9.3)	4	12.90%
1.8 (1.8.9.5)	3	9.68%
1.8 (1.8.8.8)	2	6.45%
1.8 (1.8.7.3)	2	6.45%
1.8 (1.8.8.7)	2	6.45%
1.8 (1.8.9.2)	2	6.45%
1.8 (1.8.9.1)	2	6.45%
1.8 (1.8.8.4)	1	3.23%
1.8 (1.8.1.7)	1	3.23%
1.8 (1.8.6.0)	1	3.23%
1.8 (1.8.9.4)	1	3.23%
1.8 (1.8.2.1)	1	3.23%
Other	0	0.00%
GroupWise (26 servers)
Version	Number of Servers	Percent
18.3.1	5	19.23%
18.2.1	4	15.38%
18.4.1	2	7.69%
14.2.2	2	7.69%
18.4.0	2	7.69%
6.5.7	1	3.85%
14.2.1	1	3.85%
14.2.3	1	3.85%
18.0.0	1	3.85%
18.1.1	1	3.85%
6.5.0	1	3.85%
14.2.0	1	3.85%
8.0.3	1	3.85%
14.0.0	1	3.85%
18.2.0	1	3.85%
18.0.2	1	3.85%
Other	0	0.00%
Gordano Messaging Suite (GMS) (10 servers)
Version	Number of Servers	Percent
Other	10	100.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	3	50.00%
7.3	2	33.33%
8.2	1	16.67%
Other	0	0.00%
Trend Micro (5 servers)
Version	Number of Servers	Percent
5.18	3	60.00%
5.7	2	40.00%
Other	0	0.00%
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%
Neon Mail Server (2 servers)
Version	Number of Servers	Percent
3.0.7	1	50.00%
3.1.2	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%
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%