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	2,396,615	100.0%
Number of Servers that didn't respond	434,354	18.12%
Server didn't open socket	424,420	17.71%
Server didn't provide banner	9,934	0.41%
Server provided banner	1,962,261	81.88%
Server banner identifies software in use	1,143,690	47.72%

As indicated by the above table, of the 2,396,615 servers queried, only 1,143,690 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	604,843	52.89%
Postfix	367,952	32.17%
Sendmail	79,797	6.98%
MailEnable	28,954	2.53%
Microsoft	27,275	2.38%
MDaemon	17,570	1.54%
IMail	3,920	0.34%
CommuniGate Pro	2,460	0.22%
Lotus Domino	2,220	0.19%
WinWebMail	1,833	0.16%
XMail	1,543	0.13%
Qmail Toaster	1,193	0.10%
SurgeSMTP	836	0.07%
Kerio	829	0.07%
Merak	549	0.05%
ArGoSoft	381	0.03%
MagicMail	267	0.02%
OpenSMTPD	241	0.02%
Post.Office	232	0.02%
GroupWise	205	0.02%
Gordano Messaging Suite (GMS)	194	0.02%
Trend Micro	129	0.01%
InterScan VirusWall	64	0.01%
Mirapoint	53	0.00%
VisNetic	46	0.00%
Mercury	24	0.00%
OpenVMS	20	0.00%
Interscan	14	0.00%
WebSTAR V	12	0.00%
ModusMail	11	0.00%
Neon Mail Server	10	0.00%
MessageWall	6	0.00%
NetIQ MailMarshal	4	0.00%
WebSTAR	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (604,843 servers)
Version	Number of Servers	Percent
4.85	422,601	69.87%
4.84	65,476	10.83%
4.82	20,789	3.44%
4.80	19,422	3.21%
4.80.1	18,519	3.06%
4.72	17,376	2.87%
4.76	15,454	2.56%
Other	25,206	4.17%
Postfix (367,952 servers)
Version	Number of Servers	Percent
Other	367,952	100.00%
Sendmail (79,797 servers)
Version	Number of Servers	Percent
8.14.5	17,653	22.12%
8.13.8	16,484	20.66%
8.14.4	14,694	18.41%
8.13.1	9,690	12.14%
8.14.3	5,371	6.73%
8.12.11.20060308	1,908	2.39%
8.14.7	1,842	2.31%
8.14.9	1,669	2.09%
8.13.6.20060614	1,224	1.53%
8.14.2	1,010	1.27%
8.12.10	846	1.06%
8.11.6	826	1.04%
Other	6,580	8.25%
MailEnable (28,954 servers)
Version	Number of Servers	Percent
8.60--	2,280	7.87%
6.5--	1,933	6.68%
1.986--	1,834	6.33%
8.53--	1,510	5.22%
8.51--	1,110	3.83%
8.60-8.60-	978	3.38%
5.10--	958	3.31%
8.04--	863	2.98%
8.60--8.60	847	2.93%
4.26--	714	2.47%
6.0--	682	2.36%
8.00--	658	2.27%
7.06--	614	2.12%
8.50--	604	2.09%
8.55--	417	1.44%
6.88-6.88-	411	1.42%
7.07--	407	1.41%
7.0--	389	1.34%
7.50--	373	1.29%
1.981--	360	1.24%
6.57--	360	1.24%
6.70--	353	1.22%
7.53--	326	1.13%
Other	9,973	34.44%
Microsoft (27,275 servers)
Version	Number of Servers	Percent
6.0.3790.4675	20,193	74.03%
6.0.3790.3959	2,170	7.96%
7.5.7601.17514	1,878	6.89%
6.0.3790.1830	628	2.30%
8.5.9600.16384	448	1.64%
7.0.6002.18264	419	1.54%
5.0.2195.7381	299	1.10%
8.0.9200.16384	297	1.09%
Other	943	3.46%
MDaemon (17,570 servers)
Version	Number of Servers	Percent
15.0.3	3,365	19.15%
11.0.3	892	5.08%
11.0.0	800	4.55%
13.5.1	710	4.04%
13.0.5	707	4.02%
13.0.4	703	4.00%
15.0.1	561	3.19%
14.5.2	415	2.36%
12.5.6	412	2.34%
13.6.3	408	2.32%
10.0.0	405	2.31%
14.5.3	402	2.29%
14.0.3	390	2.22%
10.1.2	324	1.84%
12.5.4	316	1.80%
15.0.0	272	1.55%
10.1.1	266	1.51%
14.0.2	252	1.43%
10.1.0	227	1.29%
9.6.1	215	1.22%
13.6.2	213	1.21%
13.0.2	196	1.12%
9.6.6	191	1.09%
13.6.0	184	1.05%
9.6.2	181	1.03%
Other	4,563	25.97%
IMail (3,920 servers)
Version	Number of Servers	Percent
8.22	440	11.22%
12.3.0.100	347	8.85%
12.4.2.27	311	7.93%
12.5.3.93	298	7.60%
9.23	247	6.30%
12.4.1.15	199	5.08%
8.15	190	4.85%
8.05	161	4.11%
12.5.1.60	147	3.75%
12.5.2.62	142	3.62%
12.2.0.235	125	3.19%
11.5	114	2.91%
11.03	111	2.83%
12.5.0.246	102	2.60%
11.01	65	1.66%
11.02	64	1.63%
10.02	62	1.58%
7.07	59	1.51%
12.4.1.9	57	1.45%
7.15	52	1.33%
12.1.0.270	47	1.20%
12.4.0.166	45	1.15%
8.00	45	1.15%
6.06	41	1.05%
Other	449	11.45%
CommuniGate Pro (2,460 servers)
Version	Number of Servers	Percent
5.1.16	256	10.41%
6.0.9	157	6.38%
6.1.2	142	5.77%
6.0.11	127	5.16%
6.1.4	94	3.82%
5.2.20	91	3.70%
5.4.11	88	3.58%
6.0.10	80	3.25%
6.0.7	66	2.68%
5.3.15	55	2.24%
5.3.13	52	2.11%
6.0.8	50	2.03%
4.1.8	49	1.99%
5.2.3	49	1.99%
5.0.14	46	1.87%
6.0.5	44	1.79%
5.2.16	31	1.26%
6.1.1	31	1.26%
5.4.6	29	1.18%
5.4.8	29	1.18%
4.2.10	28	1.14%
5.4.10	26	1.06%
6.1.5	25	1.02%
Other	815	33.13%
Lotus Domino (2,220 servers)
Version	Number of Servers	Percent
8.5.3	317	14.28%
8.5.3FP6	309	13.92%
8.5.2	109	4.91%
8.5.1	83	3.74%
8.5.3FP3	81	3.65%
8.5.2FP4	72	3.24%
8.5.3FP2	68	3.06%
7.0.2	67	3.02%
8.5	64	2.88%
8.5.3FP4	61	2.75%
8.5.2FP3	56	2.52%
8.5.3FP1	55	2.48%
8.5.3FP5	52	2.34%
8.5.2FP2	50	2.25%
7.0.3	46	2.07%
7.0.1	37	1.67%
7.0	36	1.62%
8.5.1FP5	35	1.58%
8.0.1	34	1.53%
8.0	32	1.44%
8.0.2	27	1.22%
6.5.1	27	1.22%
8.5.2FP1	27	1.22%
6.5.3	23	1.04%
6.5.4	23	1.04%
Other	429	19.32%
WinWebMail (1,833 servers)
Version	Number of Servers	Percent
3.8.1.3	298	16.26%
3.9.0.7	295	16.09%
3.7.6.1	161	8.78%
3.8.0.1	144	7.86%
3.9.0.1	127	6.93%
3.8.1.5	93	5.07%
3.8.1.1	92	5.02%
3.7.3.1	89	4.86%
3.8.5.1	88	4.80%
3.8.6.1	74	4.04%
3.7.7.3	70	3.82%
3.8.2.1	49	2.67%
3.7.1.1	49	2.67%
3.8.3.1	30	1.64%
3.7.5.1	28	1.53%
3.7.0.5	22	1.20%
3.8.3.3	21	1.15%
3.9.0.5	20	1.09%
Other	83	4.53%
XMail (1,543 servers)
Version	Number of Servers	Percent
1.27	587	38.04%
1.22	444	28.78%
1.25	181	11.73%
1.26	129	8.36%
1.24	67	4.34%
1.21	34	2.20%
1.23	24	1.56%
1.20	18	1.17%
Other	59	3.82%
Qmail Toaster (1,193 servers)
Version	Number of Servers	Percent
1.3	1,121	93.96%
1.2	22	1.84%
1.03.5	15	1.26%
Other	35	2.93%
SurgeSMTP (836 servers)
Version	Number of Servers	Percent
6.9c-1	221	26.44%
6.5a2-2	111	13.28%
6.7c-1	81	9.69%
6.5a-1	47	5.62%
6.3c2-2	32	3.83%
3.9e-1	24	2.87%
6.4a-1	23	2.75%
5.3h2-2	22	2.63%
5.2a-1	21	2.51%
3.8k4-4	19	2.27%
6.9d-29	15	1.79%
6.1c-1	12	1.44%
4.0u4-4	11	1.32%
6.0a5-5	9	1.08%
Other	188	22.49%
Kerio (829 servers)
Version	Number of Servers	Percent
6.7.3	174	20.99%
6.7.0	85	10.25%
6.6.2	72	8.69%
6.5.2	58	7.00%
6.5.0	53	6.39%
6.4.1	45	5.43%
6.7.2	45	5.43%
6.6.1	38	4.58%
6.3.1	38	4.58%
6.7.1	37	4.46%
6.5.1	27	3.26%
6.3.0	20	2.41%
6.4.2	19	2.29%
6.4.0	19	2.29%
6.6.0	13	1.57%
6.2.0	11	1.33%
6.1.3	10	1.21%
Other	65	7.84%
Merak (549 servers)
Version	Number of Servers	Percent
8.0.3	171	31.15%
8.9.1	74	13.48%
8.5.0	42	7.65%
8.3.8	32	5.83%
7.5.2	30	5.46%
7.4.5	27	4.92%
7.6.4	22	4.01%
7.6.1	15	2.73%
8.3.15	12	2.19%
7.0.1	11	2.00%
7.4.2	10	1.82%
7.2.0	9	1.64%
8.9.0	8	1.46%
8.2.4	8	1.46%
Other	78	14.21%
ArGoSoft (381 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	114	29.92%
1.8 (1.8.9.3)	54	14.17%
1.8 (1.8.9.5)	49	12.86%
1.8 (1.8.9.1)	35	9.19%
1.8 (1.8.8.8)	21	5.51%
1.8 (1.8.8.7)	20	5.25%
1.8 (1.8.9.2)	12	3.15%
1.8 (1.8.9.4)	9	2.36%
1.8 (1.8.6.0)	7	1.84%
1.8 (1.8.7.3)	6	1.57%
1.8 (1.8.8.9)	4	1.05%
1.8 (1.8.8.2)	4	1.05%
Other	46	12.07%
MagicMail (267 servers)
Version	Number of Servers	Percent
Other	267	100.00%
OpenSMTPD (241 servers)
Version	Number of Servers	Percent
Other	241	100.00%
Post.Office (232 servers)
Version	Number of Servers	Percent
4.2.2	45	19.40%
3.5.3	33	14.22%
4.1.2.4	27	11.64%
4.3	20	8.62%
4.1.0.2	12	5.17%
4.1.1	9	3.88%
4.2.1.3	9	3.88%
3.9.2.3	8	3.45%
4.0.1	6	2.59%
3.1.2J	6	2.59%
4.2.1.1	6	2.59%
4.2	5	2.16%
3.5.3J	4	1.72%
3.8.7.4	4	1.72%
3.9.2	3	1.29%
4.1.2.3	3	1.29%
4.1.0.3	3	1.29%
3.1.2	3	1.29%
3.5.1	3	1.29%
3.9.1	3	1.29%
Other	20	8.62%
GroupWise (205 servers)
Version	Number of Servers	Percent
14.0.1	37	18.05%
7.0.3	20	9.76%
6.5.7	20	9.76%
8.0.3	18	8.78%
8.0.2	17	8.29%
7.0.2	11	5.37%
14.0.0	10	4.88%
7.0.4	8	3.90%
14.0.2	8	3.90%
12.0.2	7	3.41%
7.0.1	5	2.44%
14.2.0	5	2.44%
6.5.6	5	2.44%
6.0.4	5	2.44%
6.5.4	4	1.95%
12.0.3	4	1.95%
6.0.3	3	1.46%
8.0.0	3	1.46%
12.0.1	3	1.46%
Other	12	5.85%
Gordano Messaging Suite (GMS) (194 servers)
Version	Number of Servers	Percent
Other	194	100.00%
Trend Micro (129 servers)
Version	Number of Servers	Percent
5.7	49	37.98%
5.5	24	18.60%
5.18	22	17.05%
7.0	13	10.08%
7.1	8	6.20%
8.5	4	3.10%
3.53	3	2.33%
7.5	2	1.55%
Other	4	3.10%
InterScan VirusWall (64 servers)
Version	Number of Servers	Percent
Other	64	100.00%
Mirapoint (53 servers)
Version	Number of Servers	Percent
4.3.5-GA	9	16.98%
4.4.3-GA	7	13.21%
4.3.6-GA	5	9.43%
4.4.2a-FCS	4	7.55%
4.4.5-GA	4	7.55%
4.4.4-GA	3	5.66%
4.4.6-GA	3	5.66%
4.1.9-GA	2	3.77%
4.3.3-GA	2	3.77%
3.10.10a-GA	2	3.77%
4.4.5a-GA	2	3.77%
4.1.10-GA	2	3.77%
4.1.5-GA	2	3.77%
3.10.4-GA	1	1.89%
4.1.6-GA	1	1.89%
3.7.5a-GA	1	1.89%
3.8.7a	1	1.89%
3.8.4-GA	1	1.89%
3.10.2-GA	1	1.89%
Other	0	0.00%
VisNetic (46 servers)
Version	Number of Servers	Percent
9.3.2.0	10	21.74%
9.1.4.1	6	13.04%
6.2.2.0	4	8.70%
8.5.0.8	4	8.70%
5.0.2.3	3	6.52%
5.8.6.6	3	6.52%
9.1.4.0	2	4.35%
7.6.1.0	2	4.35%
5.5.8.3	2	4.35%
5.3.5.0	2	4.35%
8.0.3	1	2.17%
8.3.0.1	1	2.17%
8.5.0.5	1	2.17%
7.2.4.1	1	2.17%
8.0.3.1	1	2.17%
5.0.2.0	1	2.17%
7.2.4.0	1	2.17%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.17%
Other	0	0.00%
Mercury (24 servers)
Version	Number of Servers	Percent
1.48	12	50.00%
3.32	10	41.67%
3.21	1	4.17%
4.x	1	4.17%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	9	45.00%
7.3	6	30.00%
8.4	5	25.00%
Other	0	0.00%
Interscan (14 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	3	21.43%
3.81-Build_1084	2	14.29%
3.81-Build_1022	2	14.29%
3.55 (build 1029)	2	14.29%
3.5 (build 1294)	1	7.14%
3.8-Build_3013	1	7.14%
3.53 (build 2013)	1	7.14%
3.53 (build 2017)	1	7.14%
3.8-Build_1080	1	7.14%
Other	0	0.00%
WebSTAR V (12 servers)
Version	Number of Servers	Percent
5.4.1	6	50.00%
5.4.0	4	33.33%
5.3.3	1	8.33%
5.3.4	1	8.33%
Other	0	0.00%
ModusMail (11 servers)
Version	Number of Servers	Percent
4.35.477.0	7	63.64%
4.1.361.21	1	9.09%
3.2.315.0	1	9.09%
4.35.477.8	1	9.09%
3.1.302.0	1	9.09%
Other	0	0.00%
Neon Mail Server (10 servers)
Version	Number of Servers	Percent
3.0.7	4	40.00%
3.1.0	2	20.00%
3.1.4	1	10.00%
3.1.2	1	10.00%
3.1.3	1	10.00%
3.0.6	1	10.00%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
NetIQ MailMarshal (4 servers)
Version	Number of Servers	Percent
5.5.6.5	2	50.00%
5.5.4.17	1	25.00%
5.5.6.7	1	25.00%
Other	0	0.00%
WebSTAR (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%