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	1,758,187	100.0%
Number of Servers that didn't respond	300,943	17.12%
Server didn't open socket	295,224	16.79%
Server didn't provide banner	5,719	0.33%
Server provided banner	1,457,244	82.88%
Server banner identifies software in use	905,695	51.51%

As indicated by the above table, of the 1,758,187 servers queried, only 905,695 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	516,145	56.99%
Postfix	311,537	34.40%
Sendmail	37,290	4.12%
MailEnable	19,636	2.17%
MDaemon	8,116	0.90%
Microsoft	5,332	0.59%
IMail	1,500	0.17%
CommuniGate Pro	1,315	0.15%
XMail	851	0.09%
Qmail Toaster	745	0.08%
WinWebMail	565	0.06%
Lotus Domino	563	0.06%
SurgeSMTP	550	0.06%
OpenSMTPD	362	0.04%
Kerio	282	0.03%
Merak	188	0.02%
MagicMail	177	0.02%
Post.Office	131	0.01%
ArGoSoft	126	0.01%
GroupWise	76	0.01%
Gordano Messaging Suite (GMS)	74	0.01%
Trend Micro	51	0.01%
InterScan VirusWall	18	0.00%
OpenVMS	17	0.00%
VisNetic	16	0.00%
Mirapoint	9	0.00%
Mercury	6	0.00%
Interscan	4	0.00%
Neon Mail Server	4	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%
MessageWall	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (516,145 servers)
Version	Number of Servers	Percent
4.91	408,201	79.09%
4.87	24,347	4.72%
4.89	23,930	4.64%
4.84	11,901	2.31%
4.90	9,129	1.77%
4.92	6,599	1.28%
Other	32,038	6.21%
Postfix (311,537 servers)
Version	Number of Servers	Percent
Other	311,537	100.00%
Sendmail (37,290 servers)
Version	Number of Servers	Percent
8.15.2	11,974	32.11%
8.14.4	7,442	19.96%
8.13.8	4,382	11.75%
8.14.7	3,030	8.13%
8.14.5	3,006	8.06%
8.13.1	2,656	7.12%
8.14.9	1,544	4.14%
8.14.3	831	2.23%
Other	2,425	6.50%
MailEnable (19,636 servers)
Version	Number of Servers	Percent
10.12--	3,897	19.85%
9.00--	1,592	8.11%
9.16--	1,532	7.80%
8.60--	553	2.82%
10.20--	501	2.55%
8.53--	458	2.33%
6.5--	405	2.06%
8.51--	337	1.72%
8.60-8.60-	312	1.59%
10.20--10.20	275	1.40%
10.16--	265	1.35%
10.18--	262	1.33%
8.04--	254	1.29%
10.19--	254	1.29%
1.986--	235	1.20%
9.75--	219	1.12%
9.00--9.00	204	1.04%
10.20-10.20-	204	1.04%
Other	7,877	40.12%
MDaemon (8,116 servers)
Version	Number of Servers	Percent
18.5.2	788	9.71%
18.5.1	510	6.28%
13.5.1	482	5.94%
13.6.3	408	5.03%
13.0.4	333	4.10%
13.0.5	320	3.94%
11.0.3	311	3.83%
11.0.0	309	3.81%
16.5.2	286	3.52%
12.5.4	183	2.25%
18.0.2	178	2.19%
12.5.6	175	2.16%
14.5.2	156	1.92%
16.0.4	132	1.63%
18.5.0	128	1.58%
10.1.2	124	1.53%
15.0.3	121	1.49%
10.0.0	118	1.45%
10.1.0	99	1.22%
17.5.3	95	1.17%
17.5.2	94	1.16%
16.5.1	90	1.11%
13.0.2	82	1.01%
Other	2,594	31.96%
Microsoft (5,332 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,613	49.01%
7.5.7601.17514	694	13.02%
8.5.9600.16384	658	12.34%
6.0.3790.3959	311	5.83%
10.0.14393.2608	167	3.13%
8.0.9200.16384	152	2.85%
5.0.2195.5329	130	2.44%
7.0.6002.18264	89	1.67%
6.0.3790.1830	85	1.59%
10.0.14393.0	75	1.41%
5.0.2195.6713	68	1.28%
Other	290	5.44%
IMail (1,500 servers)
Version	Number of Servers	Percent
12.5.6.101	298	19.87%
12.4.1.15	141	9.40%
8.22	126	8.40%
12.5.5.115	95	6.33%
12.5.3.93	92	6.13%
12.5.4.146	86	5.73%
9.23	85	5.67%
12.3.0.100	76	5.07%
8.15	64	4.27%
11.03	46	3.07%
8.05	45	3.00%
12.5.7.58	35	2.33%
12.5.5.117	23	1.53%
11.5	20	1.33%
10.02	20	1.33%
7.07	18	1.20%
7.15	16	1.07%
8.00	15	1.00%
Other	199	13.27%
CommuniGate Pro (1,315 servers)
Version	Number of Servers	Percent
6.2.12	62	4.71%
6.1.16	54	4.11%
6.2.10	54	4.11%
6.0.11	53	4.03%
5.4.11	46	3.50%
6.1.18	38	2.89%
5.2.20	36	2.74%
5.3.13	36	2.74%
5.1.16	34	2.59%
6.2.11	34	2.59%
6.2.7	30	2.28%
6.1.11	29	2.21%
6.1.20	28	2.13%
6.0.9	24	1.83%
5.2.3	24	1.83%
6.1.10	24	1.83%
6.2.9	23	1.75%
6.1.2	21	1.60%
6.2.1	20	1.52%
6.1.13	18	1.37%
6.1.15	18	1.37%
6.1.19	18	1.37%
6.2.8	17	1.29%
6.1.14	17	1.29%
4.1.8	17	1.29%
6.1.5	16	1.22%
6.2.4	16	1.22%
6.1.12	15	1.14%
6.1.17	15	1.14%
6.1.9	14	1.06%
Other	464	35.29%
XMail (851 servers)
Version	Number of Servers	Percent
1.27	410	48.18%
1.22	265	31.14%
1.26	54	6.35%
1.25	48	5.64%
1.24	33	3.88%
1.21	11	1.29%
Other	30	3.53%
Qmail Toaster (745 servers)
Version	Number of Servers	Percent
1.3	598	80.27%
1.03	119	15.97%
1.03.5	11	1.48%
1.03.6	9	1.21%
Other	8	1.07%
WinWebMail (565 servers)
Version	Number of Servers	Percent
3.9.0.7	97	17.17%
4.2.0.1	74	13.10%
3.8.1.3	70	12.39%
3.9.0.1	38	6.73%
3.8.0.1	34	6.02%
3.7.6.1	29	5.13%
3.8.1.5	23	4.07%
4.1.0.1	22	3.89%
4.0.0.1	18	3.19%
3.8.5.1	17	3.01%
3.9.2.1	15	2.65%
3.7.3.1	14	2.48%
3.8.1.1	13	2.30%
3.9.5.3	11	1.95%
3.8.3.1	11	1.95%
3.9.3.1	10	1.77%
3.8.6.1	10	1.77%
3.7.7.3	10	1.77%
3.8.2.1	10	1.77%
3.7.1.1	6	1.06%
3.9.5.1	6	1.06%
Other	27	4.78%
Lotus Domino (563 servers)
Version	Number of Servers	Percent
8.5.3FP6	109	19.36%
8.5.3	84	14.92%
7.0.2	26	4.62%
8.5.2	24	4.26%
8.5.1	21	3.73%
8.5	19	3.37%
8.5.3FP1	16	2.84%
8.5.3FP2	13	2.31%
8.5.3FP4	13	2.31%
8.5.3FP3	13	2.31%
7.0	12	2.13%
7.0.3	11	1.95%
8.5.2FP2	10	1.78%
8.5.2FP4	10	1.78%
8.0	10	1.78%
7.0.4	9	1.60%
8.0.1	9	1.60%
8.5.1FP5	9	1.60%
8.5.2FP3	9	1.60%
6.5	7	1.24%
8.5.3FP5	7	1.24%
6.5.4	7	1.24%
8.5.2FP4HF759	6	1.07%
7.0.1	6	1.07%
6.5.5	6	1.07%
7.0.3FP1	6	1.07%
Other	91	16.16%
SurgeSMTP (550 servers)
Version	Number of Servers	Percent
7.3o4-4	104	18.91%
7.3e2-2	85	15.45%
7.3i2-2	54	9.82%
7.1e-1	37	6.73%
6.5a2-2	26	4.73%
6.7c-1	20	3.64%
6.9c-1	19	3.45%
7.2a-1	19	3.45%
7.2i-1	17	3.09%
7.0c2-2	14	2.55%
3.9e-1	13	2.36%
7.3o2-2	12	2.18%
7.2e-2	11	2.00%
6.5a-1	10	1.82%
5.2a-1	7	1.27%
6.4a-1	7	1.27%
4.0u4-4	7	1.27%
6.1c-1	6	1.09%
7.3c3-3	6	1.09%
Other	76	13.82%
OpenSMTPD (362 servers)
Version	Number of Servers	Percent
Other	362	100.00%
Kerio (282 servers)
Version	Number of Servers	Percent
6.7.3	63	22.34%
6.7.0	41	14.54%
6.6.2	29	10.28%
6.5.2	27	9.57%
6.7.2	25	8.87%
6.4.1	12	4.26%
6.6.1	11	3.90%
6.5.0	11	3.90%
6.7.1	10	3.55%
6.3.1	10	3.55%
6.4.0	7	2.48%
6.6.0	6	2.13%
6.5.1	5	1.77%
6.3.0	4	1.42%
6.1.3	3	1.06%
6.1.0	3	1.06%
Other	15	5.32%
Merak (188 servers)
Version	Number of Servers	Percent
8.0.3	48	25.53%
8.9.1	39	20.74%
8.5.0	13	6.91%
7.4.5	11	5.85%
7.6.1	10	5.32%
8.3.8	10	5.32%
7.5.2	8	4.26%
9.0.3	7	3.72%
7.6.4	5	2.66%
7.4.2	4	2.13%
7.6.0	3	1.60%
7.2.0	3	1.60%
7.0.1	3	1.60%
6.0.8	3	1.60%
4.4.1	2	1.06%
Other	19	10.11%
MagicMail (177 servers)
Version	Number of Servers	Percent
Other	177	100.00%
Post.Office (131 servers)
Version	Number of Servers	Percent
4.3	33	25.19%
4.2.2	24	18.32%
4.4	14	10.69%
4.1.2.4	14	10.69%
3.5.3	9	6.87%
4.2.1.3	6	4.58%
4.1.1	4	3.05%
4.2.1.1	3	2.29%
3.5.3J	3	2.29%
3.5.1	3	2.29%
3.9.2	2	1.53%
4.0.1	2	1.53%
3.8.7.4	2	1.53%
3.9.2.3	2	1.53%
Other	10	7.63%
ArGoSoft (126 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	45	35.71%
1.8 (1.8.9.3)	17	13.49%
1.8 (1.8.9.5)	16	12.70%
1.8 (1.8.9.1)	13	10.32%
1.8 (1.8.8.8)	4	3.17%
1.8 (1.8.7.3)	4	3.17%
1.8 (1.8.7.6)	3	2.38%
1.8 (1.8.6.0)	3	2.38%
1.8 (1.8.8.9)	2	1.59%
1.8 (1.8.8.7)	2	1.59%
1.8 (1.8.5.8)	2	1.59%
1.8 (1.8.9.2)	2	1.59%
1.8 (1.8.9.4)	2	1.59%
1.8 (1.8.2.1)	2	1.59%
Other	9	7.14%
GroupWise (76 servers)
Version	Number of Servers	Percent
14.2.2	14	18.42%
18.1.0	10	13.16%
18.0.2	9	11.84%
14.2.3	5	6.58%
14.2.1	5	6.58%
14.0.1	4	5.26%
6.5.7	3	3.95%
7.0.3	3	3.95%
14.2.0	3	3.95%
18.0.0	2	2.63%
8.0.3	2	2.63%
14.0.0	2	2.63%
7.0.2	2	2.63%
6.0.4	2	2.63%
7.0.4	1	1.32%
6.5.0	1	1.32%
6.5.5	1	1.32%
12.0.1	1	1.32%
7.0.1	1	1.32%
8.0.0	1	1.32%
6.5.6	1	1.32%
6.5.4	1	1.32%
18.0.1	1	1.32%
6.0.2	1	1.32%
Other	0	0.00%
Gordano Messaging Suite (GMS) (74 servers)
Version	Number of Servers	Percent
Other	74	100.00%
Trend Micro (51 servers)
Version	Number of Servers	Percent
5.7	14	27.45%
5.18	12	23.53%
5.5	8	15.69%
7.0	7	13.73%
7.5	5	9.80%
8.5	1	1.96%
7.5ready	1	1.96%
8	1	1.96%
9.0	1	1.96%
7.1	1	1.96%
Other	0	0.00%
InterScan VirusWall (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
OpenVMS (17 servers)
Version	Number of Servers	Percent
8.4	9	52.94%
7.3	5	29.41%
8.3	2	11.76%
8.2	1	5.88%
Other	0	0.00%
VisNetic (16 servers)
Version	Number of Servers	Percent
9.3.2.0	8	50.00%
5.5.8.3	2	12.50%
5.8.6.6	2	12.50%
8.0.3	1	6.25%
5.0.2.3	1	6.25%
9.1.4.0	1	6.25%
6.2.2.0	1	6.25%
Other	0	0.00%
Mirapoint (9 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	22.22%
4.4.3-GA	2	22.22%
4.3.6-GA	1	11.11%
3.10.10a-GA	1	11.11%
4.3.5-GA	1	11.11%
4.4.5-GA	1	11.11%
4.4.6-GA	1	11.11%
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%
Interscan (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_3013	1	25.00%
3.8-Build_1080	1	25.00%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.1.3	1	25.00%
3.1.0	1	25.00%
3.1.2	1	25.00%
3.0.8	1	25.00%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
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%