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	1,239,937	100.0%
Number of Servers that didn't respond	207,955	16.77%
Server didn't open socket	204,617	16.50%
Server didn't provide banner	3,338	0.27%
Server provided banner	1,031,982	83.23%
Server banner identifies software in use	652,247	52.60%

As indicated by the above table, of the 1,239,937 servers queried, only 652,247 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	377,575	57.89%
Postfix	223,530	34.27%
Sendmail	25,217	3.87%
MailEnable	13,729	2.10%
MDaemon	4,783	0.73%
Microsoft	2,674	0.41%
CommuniGate Pro	911	0.14%
IMail	780	0.12%
Qmail Toaster	560	0.09%
XMail	542	0.08%
SurgeSMTP	387	0.06%
OpenSMTPD	299	0.05%
Lotus Domino	267	0.04%
WinWebMail	259	0.04%
MagicMail	144	0.02%
Kerio	143	0.02%
Merak	118	0.02%
Post.Office	89	0.01%
ArGoSoft	73	0.01%
GroupWise	58	0.01%
Gordano Messaging Suite (GMS)	44	0.01%
Trend Micro	28	0.00%
OpenVMS	10	0.00%
VisNetic	8	0.00%
InterScan VirusWall	5	0.00%
Interscan	3	0.00%
WebSTAR V	3	0.00%
Mercury	2	0.00%
ModusMail	2	0.00%
Mirapoint	2	0.00%
MessageWall	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (377,575 servers)
Version	Number of Servers	Percent
4.92	149,732	39.66%
4.93	134,011	35.49%
4.91	24,002	6.36%
4.92.3	14,565	3.86%
4.93.0.4	12,063	3.19%
4.87	7,139	1.89%
4.89	6,528	1.73%
4.84	5,493	1.45%
4.92.2	4,171	1.10%
4.90	3,917	1.04%
Other	15,954	4.23%
Postfix (223,530 servers)
Version	Number of Servers	Percent
Other	223,530	100.00%
Sendmail (25,217 servers)
Version	Number of Servers	Percent
8.15.2	10,864	43.08%
8.14.4	4,411	17.49%
8.14.7	2,173	8.62%
8.13.8	2,171	8.61%
8.14.5	1,719	6.82%
8.13.1	1,220	4.84%
8.14.9	756	3.00%
8.14.3	461	1.83%
Other	1,442	5.72%
MailEnable (13,729 servers)
Version	Number of Servers	Percent
10.25--	3,915	28.52%
10.27--	1,731	12.61%
9.00--	631	4.60%
10.12--	297	2.16%
10.29--	247	1.80%
9.16--	231	1.68%
8.60--	211	1.54%
10.29--10.29	199	1.45%
10.29-10.29-	160	1.17%
9.00--9.00	158	1.15%
10.20--	157	1.14%
8.53--	154	1.12%
Other	5,638	41.07%
MDaemon (4,783 servers)
Version	Number of Servers	Percent
19.5.4	537	11.23%
13.5.1	300	6.27%
13.6.3	300	6.27%
13.0.4	207	4.33%
19.5.3	204	4.27%
13.0.5	192	4.01%
11.0.3	168	3.51%
11.0.0	166	3.47%
16.5.2	135	2.82%
19.0.3	122	2.55%
19.5.1	117	2.45%
12.5.6	108	2.26%
12.5.4	99	2.07%
14.5.2	98	2.05%
10.1.2	70	1.46%
10.0.0	60	1.25%
16.0.4	56	1.17%
15.0.3	55	1.15%
18.5.3	49	1.02%
Other	1,740	36.38%
Microsoft (2,674 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,134	42.41%
8.5.9600.16384	414	15.48%
7.5.7601.17514	303	11.33%
10.0.14393.2608	173	6.47%
6.0.3790.3959	143	5.35%
5.0.2195.5329	83	3.10%
8.0.9200.16384	62	2.32%
5.0.2195.6713	44	1.65%
10.0.17763.1	43	1.61%
6.0.3790.1830	42	1.57%
7.0.6002.18264	40	1.50%
Other	193	7.22%
CommuniGate Pro (911 servers)
Version	Number of Servers	Percent
6.2.14	102	11.20%
6.2.15	45	4.94%
6.2.12	43	4.72%
6.1.20	34	3.73%
6.1.16	31	3.40%
6.0.11	30	3.29%
5.4.11	27	2.96%
6.2.13	25	2.74%
5.2.20	25	2.74%
5.3.13	24	2.63%
6.1.18	22	2.41%
5.1.16	20	2.20%
6.0.9	17	1.87%
6.2.10	15	1.65%
6.2.7	14	1.54%
6.2.9	11	1.21%
6.1.10	10	1.10%
6.1.12	10	1.10%
6.1.11	10	1.10%
6.1.2	10	1.10%
Other	386	42.37%
IMail (780 servers)
Version	Number of Servers	Percent
12.5.7.59	122	15.64%
12.5.6.101	97	12.44%
12.4.1.15	56	7.18%
9.23	49	6.28%
8.22	43	5.51%
12.5.3.93	39	5.00%
12.5.8.41	36	4.62%
12.5.5.115	36	4.62%
12.3.0.100	34	4.36%
8.15	29	3.72%
8.05	23	2.95%
11.03	21	2.69%
12.5.4.146	20	2.56%
10.02	16	2.05%
12.5.6.105	15	1.92%
12.5.7.58	15	1.92%
12.5.5.117	14	1.79%
11.5	10	1.28%
7.15	9	1.15%
10.01	8	1.03%
Other	88	11.28%
Qmail Toaster (560 servers)
Version	Number of Servers	Percent
1.3	429	76.61%
1.03	115	20.54%
1.03.5	8	1.43%
Other	8	1.43%
XMail (542 servers)
Version	Number of Servers	Percent
1.27	280	51.66%
1.22	170	31.37%
1.26	27	4.98%
1.25	26	4.80%
1.24	17	3.14%
Other	22	4.06%
SurgeSMTP (387 servers)
Version	Number of Servers	Percent
7.3o4-4	118	30.49%
7.3e2-2	39	10.08%
7.4e-1	36	9.30%
7.1e-1	20	5.17%
6.5a2-2	18	4.65%
7.3i2-2	15	3.88%
6.7c-1	12	3.10%
7.2i-1	10	2.58%
7.2a-1	9	2.33%
3.9e-1	9	2.33%
7.4i-1	9	2.33%
6.5a-1	6	1.55%
6.9c-1	6	1.55%
7.0c2-2	6	1.55%
7.4g-1	5	1.29%
7.4a-1	4	1.03%
7.2e-2	4	1.03%
7.4h-8	4	1.03%
Other	57	14.73%
OpenSMTPD (299 servers)
Version	Number of Servers	Percent
Other	299	100.00%
Lotus Domino (267 servers)
Version	Number of Servers	Percent
8.5.3FP6	53	19.85%
8.5.3	36	13.48%
7.0.2	14	5.24%
8.5.2	13	4.87%
8.5.1	11	4.12%
7.0	9	3.37%
8.5	8	3.00%
7.0.3	8	3.00%
8.5.2FP2	8	3.00%
8.5.3FP5	6	2.25%
8.0.1	6	2.25%
8.5.3FP4	6	2.25%
8.5.3FP3	6	2.25%
6.5.4	5	1.87%
8.5.3FP2	5	1.87%
8.5.3FP1	5	1.87%
8.5.2FP4	5	1.87%
8.5.2FP3	5	1.87%
6.5.3	4	1.50%
7.0.3FP1	4	1.50%
8.5.1FP4	3	1.12%
5.0.8	3	1.12%
8.5.1FP5	3	1.12%
6.5.5	3	1.12%
Other	38	14.23%
WinWebMail (259 servers)
Version	Number of Servers	Percent
4.2.0.1	61	23.55%
3.9.0.7	47	18.15%
3.8.1.3	26	10.04%
3.7.6.1	14	5.41%
3.9.0.1	14	5.41%
3.8.1.5	10	3.86%
3.8.0.1	9	3.47%
4.1.0.1	8	3.09%
4.0.0.1	8	3.09%
3.8.3.1	7	2.70%
3.9.2.1	7	2.70%
3.7.3.1	6	2.32%
3.8.5.1	6	2.32%
3.8.6.1	5	1.93%
3.8.1.1	5	1.93%
1.0	4	1.54%
3.9.5.3	4	1.54%
3.7.7.3	3	1.16%
3.7.0.3	3	1.16%
Other	12	4.63%
MagicMail (144 servers)
Version	Number of Servers	Percent
Other	144	100.00%
Kerio (143 servers)
Version	Number of Servers	Percent
6.7.3	31	21.68%
6.7.0	18	12.59%
6.5.2	15	10.49%
6.7.2	14	9.79%
6.6.2	12	8.39%
6.7.1	8	5.59%
6.4.1	7	4.90%
6.6.1	6	4.20%
6.5.0	6	4.20%
6.1.0	5	3.50%
6.3.0	3	2.10%
6.1.3	3	2.10%
6.4.0	3	2.10%
5.7.9	2	1.40%
6.5.1	2	1.40%
Other	8	5.59%
Merak (118 servers)
Version	Number of Servers	Percent
8.0.3	29	24.58%
8.9.1	26	22.03%
7.6.1	9	7.63%
7.4.5	7	5.93%
8.5.0	6	5.08%
9.0.3	6	5.08%
8.3.8	5	4.24%
7.5.2	4	3.39%
7.6.4	3	2.54%
7.6.0	2	1.69%
7.0.1	2	1.69%
6.0.8	2	1.69%
Other	17	14.41%
Post.Office (89 servers)
Version	Number of Servers	Percent
4.3	25	28.09%
4.2.2	17	19.10%
4.4	16	17.98%
4.1.2.4	8	8.99%
3.5.3	8	8.99%
3.9.2	2	2.25%
4.1.1	2	2.25%
4.1.2.1	1	1.12%
3.9.2.1	1	1.12%
4.0.1	1	1.12%
3.5.3J	1	1.12%
4.2.1.1	1	1.12%
3.6.2	1	1.12%
3.9.1.3	1	1.12%
4.1.0.3	1	1.12%
4.1	1	1.12%
3.1.2	1	1.12%
4.2	1	1.12%
Other	0	0.00%
ArGoSoft (73 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	22	30.14%
1.8 (1.8.9.3)	13	17.81%
1.8 (1.8.9.5)	13	17.81%
1.8 (1.8.9.1)	5	6.85%
1.8 (1.8.8.8)	3	4.11%
1.8 (1.8.7.3)	3	4.11%
1.8 (1.8.9.2)	2	2.74%
1.8 (1.8.6.0)	2	2.74%
1.8 (1.8.8.9)	1	1.37%
1.8 (1.8.8.7)	1	1.37%
1.8 (1.8.7.6)	1	1.37%
1.8 (1.8.5.8)	1	1.37%
1.8 (1.8.8.4)	1	1.37%
1.8 (1.8.9.4)	1	1.37%
1.8 (1.8.1.1)	1	1.37%
1.8 (1.8.1.7)	1	1.37%
1.8 (1.8.2.1)	1	1.37%
1.8 (1.8.2.5)	1	1.37%
Other	0	0.00%
GroupWise (58 servers)
Version	Number of Servers	Percent
18.1.1	10	17.24%
18.2.0	7	12.07%
14.2.2	6	10.34%
14.2.3	4	6.90%
14.2.1	4	6.90%
18.1.0	4	6.90%
14.2.0	3	5.17%
18.0.0	3	5.17%
18.0.2	3	5.17%
14.0.0	2	3.45%
14.0.1	2	3.45%
6.5.7	1	1.72%
6.5.0	1	1.72%
12.0.1	1	1.72%
8.0.3	1	1.72%
7.0.1	1	1.72%
6.5.6	1	1.72%
7.0.2	1	1.72%
7.0.4	1	1.72%
6.0.2	1	1.72%
8.0.2	1	1.72%
Other	0	0.00%
Gordano Messaging Suite (GMS) (44 servers)
Version	Number of Servers	Percent
Other	44	100.00%
Trend Micro (28 servers)
Version	Number of Servers	Percent
5.18	9	32.14%
5.7	7	25.00%
7.5	5	17.86%
7.0	4	14.29%
5.5	1	3.57%
7.5ready	1	3.57%
7.1	1	3.57%
Other	0	0.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	5	50.00%
7.3	3	30.00%
8.2	1	10.00%
8.3	1	10.00%
Other	0	0.00%
VisNetic (8 servers)
Version	Number of Servers	Percent
9.3.2.0	7	87.50%
8.0.3	1	12.50%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
Interscan (3 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	33.33%
3.8-Build_1080	1	33.33%
3.81-Build_1022	1	33.33%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	2	66.67%
5.3.2	1	33.33%
Other	0	0.00%
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%
Mirapoint (2 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	50.00%
4.4.6-GA	1	50.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	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%