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	1,753,222	100.0%
Number of Servers that didn't respond	320,527	18.28%
Server didn't open socket	314,858	17.96%
Server didn't provide banner	5,669	0.32%
Server provided banner	1,432,695	81.72%
Server banner identifies software in use	889,683	50.75%

As indicated by the above table, of the 1,753,222 servers queried, only 889,683 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	507,389	57.03%
Postfix	307,010	34.51%
Sendmail	36,019	4.05%
MailEnable	19,109	2.15%
MDaemon	7,728	0.87%
Microsoft	5,047	0.57%
IMail	1,439	0.16%
CommuniGate Pro	1,288	0.14%
XMail	830	0.09%
Qmail Toaster	738	0.08%
Lotus Domino	538	0.06%
WinWebMail	537	0.06%
SurgeSMTP	531	0.06%
OpenSMTPD	347	0.04%
Kerio	258	0.03%
MagicMail	179	0.02%
Merak	176	0.02%
Post.Office	134	0.02%
ArGoSoft	116	0.01%
GroupWise	77	0.01%
Gordano Messaging Suite (GMS)	69	0.01%
Trend Micro	50	0.01%
InterScan VirusWall	18	0.00%
OpenVMS	16	0.00%
VisNetic	14	0.00%
Mercury	6	0.00%
Mirapoint	5	0.00%
WebSTAR V	4	0.00%
Interscan	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%
MessageWall	2	0.00%
Neon Mail Server	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (507,389 servers)
Version	Number of Servers	Percent
4.91	396,512	78.15%
4.92	22,041	4.34%
4.87	21,223	4.18%
4.89	18,632	3.67%
4.84	11,176	2.20%
4.90	8,190	1.61%
Other	29,615	5.84%
Postfix (307,010 servers)
Version	Number of Servers	Percent
Other	307,010	100.00%
Sendmail (36,019 servers)
Version	Number of Servers	Percent
8.15.2	12,091	33.57%
8.14.4	7,075	19.64%
8.13.8	3,985	11.06%
8.14.5	2,959	8.22%
8.14.7	2,832	7.86%
8.13.1	2,530	7.02%
8.14.9	1,493	4.15%
8.14.3	745	2.07%
Other	2,309	6.41%
MailEnable (19,109 servers)
Version	Number of Servers	Percent
10.12--	4,413	23.09%
9.00--	1,436	7.51%
9.16--	1,313	6.87%
8.60--	481	2.52%
10.20--	448	2.34%
8.53--	396	2.07%
6.5--	351	1.84%
8.60-8.60-	298	1.56%
8.51--	298	1.56%
10.23--	270	1.41%
10.18--	242	1.27%
10.16--	241	1.26%
8.04--	226	1.18%
1.986--	212	1.11%
10.19--	205	1.07%
9.00--9.00	195	1.02%
Other	8,084	42.30%
MDaemon (7,728 servers)
Version	Number of Servers	Percent
19.0.0	553	7.16%
13.5.1	484	6.26%
13.6.3	408	5.28%
18.5.3	351	4.54%
13.0.4	321	4.15%
13.0.5	304	3.93%
11.0.3	296	3.83%
11.0.0	290	3.75%
16.5.2	249	3.22%
18.5.2	240	3.11%
18.5.1	212	2.74%
12.5.4	169	2.19%
12.5.6	167	2.16%
14.5.2	142	1.84%
19.0.1	128	1.66%
15.0.3	112	1.45%
18.0.2	112	1.45%
10.1.2	109	1.41%
16.0.4	109	1.41%
10.0.0	105	1.36%
10.1.0	93	1.20%
16.5.1	82	1.06%
13.0.2	78	1.01%
Other	2,614	33.83%
Microsoft (5,047 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,407	47.69%
7.5.7601.17514	655	12.98%
8.5.9600.16384	646	12.80%
6.0.3790.3959	304	6.02%
10.0.14393.2608	198	3.92%
8.0.9200.16384	142	2.81%
5.0.2195.5329	129	2.56%
7.0.6002.18264	83	1.64%
6.0.3790.1830	83	1.64%
5.0.2195.6713	63	1.25%
10.0.14393.0	51	1.01%
Other	286	5.67%
IMail (1,439 servers)
Version	Number of Servers	Percent
12.5.6.101	224	15.57%
12.4.1.15	136	9.45%
8.22	119	8.27%
12.5.5.115	89	6.18%
12.5.3.93	85	5.91%
9.23	84	5.84%
12.5.7.59	78	5.42%
12.5.4.146	72	5.00%
12.3.0.100	71	4.93%
8.15	57	3.96%
12.5.7.58	43	2.99%
11.03	43	2.99%
8.05	43	2.99%
12.5.5.117	24	1.67%
10.02	21	1.46%
11.5	20	1.39%
7.07	18	1.25%
7.15	15	1.04%
8.00	15	1.04%
10.01	15	1.04%
Other	167	11.61%
CommuniGate Pro (1,288 servers)
Version	Number of Servers	Percent
6.2.12	113	8.77%
6.1.16	54	4.19%
6.0.11	49	3.80%
5.4.11	44	3.42%
6.2.10	40	3.11%
6.1.18	39	3.03%
5.2.20	36	2.80%
5.3.13	36	2.80%
6.1.20	32	2.48%
5.1.16	30	2.33%
6.1.11	27	2.10%
6.2.7	26	2.02%
6.0.9	25	1.94%
6.2.11	25	1.94%
6.1.10	24	1.86%
6.2.1	20	1.55%
5.2.3	20	1.55%
6.2.9	19	1.48%
6.1.2	19	1.48%
6.2.4	17	1.32%
4.1.8	17	1.32%
6.1.5	16	1.24%
6.1.13	16	1.24%
6.1.19	16	1.24%
6.2.8	15	1.16%
6.1.12	15	1.16%
6.1.17	15	1.16%
6.1.9	14	1.09%
6.1.15	14	1.09%
6.1.14	14	1.09%
6.2.5	14	1.09%
5.3.15	13	1.01%
4.2.10	13	1.01%
Other	401	31.13%
XMail (830 servers)
Version	Number of Servers	Percent
1.27	398	47.95%
1.22	261	31.45%
1.26	52	6.27%
1.25	47	5.66%
1.24	32	3.86%
1.21	9	1.08%
Other	31	3.73%
Qmail Toaster (738 servers)
Version	Number of Servers	Percent
1.3	587	79.54%
1.03	123	16.67%
1.03.5	11	1.49%
1.03.6	9	1.22%
Other	8	1.08%
Lotus Domino (538 servers)
Version	Number of Servers	Percent
8.5.3FP6	111	20.63%
8.5.3	79	14.68%
8.5.2	25	4.65%
7.0.2	21	3.90%
8.5	20	3.72%
8.5.1	18	3.35%
8.5.3FP2	14	2.60%
8.5.3FP3	14	2.60%
7.0	12	2.23%
8.5.3FP1	12	2.23%
8.5.2FP2	11	2.04%
7.0.3	11	2.04%
8.0.1	10	1.86%
8.5.3FP4	10	1.86%
8.0	10	1.86%
8.5.2FP4	9	1.67%
8.5.2FP3	9	1.67%
6.5.4	7	1.30%
7.0.4	7	1.30%
8.5.1FP5	7	1.30%
6.5	6	1.12%
8.5.3FP5	6	1.12%
8.5.2FP4HF759	6	1.12%
7.0.1	6	1.12%
6.5.5	6	1.12%
Other	91	16.91%
WinWebMail (537 servers)
Version	Number of Servers	Percent
3.9.0.7	91	16.95%
4.2.0.1	89	16.57%
3.8.1.3	57	10.61%
3.9.0.1	37	6.89%
3.8.0.1	28	5.21%
3.7.6.1	26	4.84%
3.8.1.5	23	4.28%
4.1.0.1	21	3.91%
4.0.0.1	19	3.54%
3.7.3.1	14	2.61%
3.8.5.1	13	2.42%
3.8.6.1	12	2.23%
3.8.1.1	12	2.23%
3.9.2.1	12	2.23%
3.7.7.3	11	2.05%
3.9.3.1	10	1.86%
3.8.3.1	9	1.68%
3.9.5.3	8	1.49%
3.8.2.1	7	1.30%
3.7.0.5	6	1.12%
Other	32	5.96%
SurgeSMTP (531 servers)
Version	Number of Servers	Percent
7.3o4-4	130	24.48%
7.3e2-2	76	14.31%
7.1e-1	36	6.78%
7.3i2-2	35	6.59%
6.5a2-2	24	4.52%
6.9c-1	19	3.58%
6.7c-1	19	3.58%
7.2a-1	15	2.82%
7.2i-1	15	2.82%
3.9e-1	13	2.45%
7.3o2-2	12	2.26%
7.0c2-2	12	2.26%
6.5a-1	10	1.88%
7.2e-2	9	1.69%
5.2a-1	7	1.32%
6.4a-1	7	1.32%
6.1c-1	6	1.13%
4.0u4-4	6	1.13%
Other	80	15.07%
OpenSMTPD (347 servers)
Version	Number of Servers	Percent
Other	347	100.00%
Kerio (258 servers)
Version	Number of Servers	Percent
6.7.3	61	23.64%
6.7.0	34	13.18%
6.6.2	25	9.69%
6.7.2	24	9.30%
6.5.2	23	8.91%
6.5.0	12	4.65%
6.4.1	11	4.26%
6.6.1	10	3.88%
6.7.1	10	3.88%
6.3.1	8	3.10%
6.4.0	7	2.71%
6.6.0	6	2.33%
6.3.0	4	1.55%
6.5.1	4	1.55%
6.1.3	3	1.16%
5.7.9	3	1.16%
Other	13	5.04%
MagicMail (179 servers)
Version	Number of Servers	Percent
Other	179	100.00%
Merak (176 servers)
Version	Number of Servers	Percent
8.0.3	43	24.43%
8.9.1	38	21.59%
8.5.0	13	7.39%
7.4.5	10	5.68%
7.6.1	10	5.68%
7.5.2	8	4.55%
9.0.3	7	3.98%
8.3.8	6	3.41%
7.4.2	4	2.27%
7.6.4	4	2.27%
7.2.0	4	2.27%
7.6.0	3	1.70%
7.0.1	3	1.70%
6.0.8	3	1.70%
4.4.1	2	1.14%
Other	18	10.23%
Post.Office (134 servers)
Version	Number of Servers	Percent
4.3	34	25.37%
4.2.2	25	18.66%
4.4	17	12.69%
4.1.2.4	13	9.70%
3.5.3	9	6.72%
4.2.1.3	6	4.48%
4.1.1	4	2.99%
3.5.3J	3	2.24%
3.5.1	3	2.24%
3.9.2	2	1.49%
4.0.1	2	1.49%
4.2.1.1	2	1.49%
3.8.7.4	2	1.49%
3.9.2.3	2	1.49%
Other	10	7.46%
ArGoSoft (116 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	43	37.07%
1.8 (1.8.9.3)	16	13.79%
1.8 (1.8.9.5)	15	12.93%
1.8 (1.8.9.1)	12	10.34%
1.8 (1.8.7.3)	4	3.45%
1.8 (1.8.8.8)	3	2.59%
1.8 (1.8.9.2)	3	2.59%
1.8 (1.8.7.6)	2	1.72%
1.8 (1.8.8.9)	2	1.72%
1.8 (1.8.8.7)	2	1.72%
1.8 (1.8.5.8)	2	1.72%
1.8 (1.8.6.0)	2	1.72%
Other	10	8.62%
GroupWise (77 servers)
Version	Number of Servers	Percent
14.2.2	11	14.29%
18.1.0	10	12.99%
18.0.2	9	11.69%
14.2.3	7	9.09%
14.2.1	5	6.49%
14.2.0	4	5.19%
18.1.1	4	5.19%
6.5.7	3	3.90%
7.0.3	3	3.90%
14.0.0	2	2.60%
18.0.0	2	2.60%
14.0.1	2	2.60%
8.0.3	2	2.60%
18.0.1	2	2.60%
7.0.2	2	2.60%
7.0.4	1	1.30%
6.5.0	1	1.30%
6.5.5	1	1.30%
12.0.1	1	1.30%
7.0.1	1	1.30%
6.5.6	1	1.30%
6.5.4	1	1.30%
6.0.2	1	1.30%
6.0.4	1	1.30%
Other	0	0.00%
Gordano Messaging Suite (GMS) (69 servers)
Version	Number of Servers	Percent
Other	69	100.00%
Trend Micro (50 servers)
Version	Number of Servers	Percent
5.7	14	28.00%
5.18	12	24.00%
5.5	7	14.00%
7.0	7	14.00%
7.5	5	10.00%
8.5	1	2.00%
7.5ready	1	2.00%
8	1	2.00%
9.0	1	2.00%
7.1	1	2.00%
Other	0	0.00%
InterScan VirusWall (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
OpenVMS (16 servers)
Version	Number of Servers	Percent
8.4	9	56.25%
7.3	4	25.00%
8.3	2	12.50%
8.2	1	6.25%
Other	0	0.00%
VisNetic (14 servers)
Version	Number of Servers	Percent
9.3.2.0	8	57.14%
5.5.8.3	2	14.29%
8.0.3	1	7.14%
5.0.2.3	1	7.14%
9.1.4.0	1	7.14%
6.2.2.0	1	7.14%
Other	0	0.00%
Mercury (6 servers)
Version	Number of Servers	Percent
3.32	3	50.00%
1.48	3	50.00%
Other	0	0.00%
Mirapoint (5 servers)
Version	Number of Servers	Percent
4.3.6-GA	1	20.00%
3.10.10a-GA	1	20.00%
4.3.5-GA	1	20.00%
4.4.5-GA	1	20.00%
4.4.6-GA	1	20.00%
Other	0	0.00%
WebSTAR V (4 servers)
Version	Number of Servers	Percent
5.4.1	3	75.00%
5.3.2	1	25.00%
Other	0	0.00%
Interscan (3 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	66.67%
3.8-Build_3013	1	33.33%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Neon Mail Server (2 servers)
Version	Number of Servers	Percent
3.1.0	1	50.00%
3.1.2	1	50.00%
Other	0	0.00%