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	2,069,274	100.0%
Number of Servers that didn't respond	334,022	16.14%
Server didn't open socket	320,814	15.50%
Server didn't provide banner	13,208	0.64%
Server provided banner	1,735,252	83.86%
Server banner identifies software in use	960,618	46.42%

As indicated by the above table, of the 2,069,274 servers queried, only 960,618 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	310,614	32.33%
Postfix	197,003	20.51%
Microsoft	180,198	18.76%
Sendmail	167,672	17.45%
MailEnable	29,922	3.11%
MDaemon	22,947	2.39%
IMail	14,072	1.46%
Kerio	6,776	0.71%
Lotus Domino	5,570	0.58%
WinWebMail	5,093	0.53%
CommuniGate Pro	4,007	0.42%
Merak	2,993	0.31%
XMail	2,650	0.28%
Qmail Toaster	1,833	0.19%
ArGoSoft	1,571	0.16%
GroupWise	1,521	0.16%
SurgeSMTP	1,452	0.15%
Trend Micro	1,126	0.12%
Gordano Messaging Suite (GMS)	617	0.06%
Post.Office	597	0.06%
MagicMail	468	0.05%
Mirapoint	413	0.04%
VisNetic	346	0.04%
InterScan VirusWall	343	0.04%
NetIQ MailMarshal	196	0.02%
Interscan	152	0.02%
Mercury	103	0.01%
WebSTAR V	89	0.01%
Neon Mail Server	86	0.01%
MessageWall	48	0.00%
ModusMail	47	0.00%
WebSTAR	36	0.00%
MAILsweeper	28	0.00%
OpenVMS	26	0.00%
OpenSMTPD	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (310,614 servers)
Version	Number of Servers	Percent
4.69	261,346	84.14%
4.67	13,929	4.48%
4.63	13,776	4.44%
4.71	4,784	1.54%
4.66	3,204	1.03%
Other	13,575	4.37%
Postfix (197,003 servers)
Version	Number of Servers	Percent
Other	197,003	100.00%
Microsoft (180,198 servers)
Version	Number of Servers	Percent
6.0.3790.3959	156,376	86.78%
6.0.3790.1830	13,466	7.47%
5.0.2195.6713	6,624	3.68%
Other	3,732	2.07%
Sendmail (167,672 servers)
Version	Number of Servers	Percent
8.13.1	33,798	20.16%
8.13.8	25,426	15.16%
8.14.3	15,218	9.08%
8.12.11.20060614	14,574	8.69%
8.12.11.20060308	13,574	8.10%
8.13.6.20060614	10,243	6.11%
8.13.6	7,588	4.53%
8.12.10	6,157	3.67%
8.11.6	5,794	3.46%
8.14.2	5,217	3.11%
8.14.4	4,631	2.76%
8.12.11	4,205	2.51%
8.14.1	4,036	2.41%
8.13.4	3,222	1.92%
8.13.7	3,072	1.83%
8.12.8	2,732	1.63%
8.9.3	1,682	1.00%
Other	6,503	3.88%
MailEnable (29,922 servers)
Version	Number of Servers	Percent
1.986--	8,694	29.06%
1.981--	3,696	12.35%
1.983--	2,348	7.85%
3.62--	1,548	5.17%
0-3.63-	757	2.53%
1.96--	699	2.34%
1.95--	675	2.26%
1.9--	542	1.81%
0-3.61-	461	1.54%
0-3.6-	450	1.50%
4.17--	439	1.47%
0-1.87-	434	1.45%
0-2.53-	414	1.38%
--3.63	401	1.34%
4.0--	397	1.33%
0-3.14-	367	1.23%
0-3.62-	360	1.20%
1.8--	355	1.19%
0-2.37-	311	1.04%
4.22--	300	1.00%
Other	6,274	20.97%
MDaemon (22,947 servers)
Version	Number of Servers	Percent
10.1.2	5,945	25.91%
10.1.1	1,791	7.80%
10.0.0	1,464	6.38%
9.6.1	1,019	4.44%
9.6.6	909	3.96%
10.1.0	869	3.79%
10.0.5	826	3.60%
9.6.5	681	2.97%
9.5.2	640	2.79%
10.0.4	633	2.76%
10.0.2	560	2.44%
9.6.4	530	2.31%
9.5.1	526	2.29%
8.1.3	511	2.23%
9.5.6	478	2.08%
9.6.2	478	2.08%
9.0.4	441	1.92%
9.6.3	292	1.27%
7.2.3	288	1.26%
6.8.5	286	1.25%
9.0.1	263	1.15%
9.5.5	259	1.13%
7.2.0	233	1.02%
Other	3,025	13.18%
IMail (14,072 servers)
Version	Number of Servers	Percent
8.22	2,658	18.89%
8.15	1,366	9.71%
11.01	1,256	8.93%
9.23	1,053	7.48%
11.0	949	6.74%
10.02	866	6.15%
8.05	714	5.07%
9.10	551	3.92%
9.20	515	3.66%
7.07	498	3.54%
10.01	468	3.33%
9.21	391	2.78%
7.15	341	2.42%
6.06	300	2.13%
8.00	259	1.84%
8.04	195	1.39%
8.10	174	1.24%
8.21	170	1.21%
9.22	148	1.05%
8.01	147	1.04%
Other	1,053	7.48%
Kerio (6,776 servers)
Version	Number of Servers	Percent
6.7.3	1,630	24.06%
6.7.2	908	13.40%
6.7.0	692	10.21%
6.6.2	686	10.12%
6.7.1	409	6.04%
6.5.0	324	4.78%
6.5.2	317	4.68%
6.4.1	240	3.54%
6.3.1	226	3.34%
6.5.1	175	2.58%
6.6.0	172	2.54%
6.4.0	161	2.38%
6.6.1	125	1.84%
6.4.2	122	1.80%
6.3.0	96	1.42%
Other	493	7.28%
Lotus Domino (5,570 servers)
Version	Number of Servers	Percent
8.5.1	665	11.94%
8.5	520	9.34%
7.0.2	423	7.59%
8.0.2	279	5.01%
7.0.3	257	4.61%
8.0.1	250	4.49%
7.0.1	228	4.09%
6.5.4	204	3.66%
6.5.1	191	3.43%
8.5.1FP1	191	3.43%
6.5.3	162	2.91%
7.0.2FP2	162	2.91%
7.0.3FP1	152	2.73%
8.5FP1	137	2.46%
6.5.5	134	2.41%
8.0	134	2.41%
7.0	130	2.33%
6.5	121	2.17%
5.0.11	76	1.36%
7.0.2FP3	67	1.20%
6.5.2	60	1.08%
7.0.2FP1	56	1.01%
Other	971	17.43%
WinWebMail (5,093 servers)
Version	Number of Servers	Percent
3.8.0.1	1,386	27.21%
3.7.6.1	934	18.34%
3.7.3.1	695	13.65%
3.7.7.3	690	13.55%
3.7.1.1	367	7.21%
3.7.5.1	245	4.81%
3.6.3.1	177	3.48%
3.7.7.1	170	3.34%
3.7.0.5	160	3.14%
3.7.0.3	118	2.32%
3.7.0.7	112	2.20%
Other	39	0.77%
CommuniGate Pro (4,007 servers)
Version	Number of Servers	Percent
5.2.16	255	6.36%
4.1.8	246	6.14%
5.1.13	177	4.42%
5.3.2	168	4.19%
4.2.10	162	4.04%
5.2.14	140	3.49%
5.1.16	139	3.47%
5.2.19	125	3.12%
5.2.12	118	2.94%
5.3.3	113	2.82%
5.2.13	104	2.60%
5.1.12	104	2.60%
5.2.3	102	2.55%
5.2.8	96	2.40%
5.2.18	96	2.40%
5.2.10	78	1.95%
5.0.14	76	1.90%
5.2.17	67	1.67%
5.2.11	64	1.60%
5.1.14	60	1.50%
5.2.9	57	1.42%
5.0.9	57	1.42%
5.2.6	55	1.37%
5.3.1	51	1.27%
5.1.9	50	1.25%
5.2.15	45	1.12%
4.2.8	44	1.10%
5.2.0	43	1.07%
4.2.9	41	1.02%
Other	1,074	26.80%
Merak (2,993 servers)
Version	Number of Servers	Percent
8.0.3	1,254	41.90%
8.9.1	289	9.66%
8.5.0	179	5.98%
7.4.5	150	5.01%
7.5.2	140	4.68%
7.6.4	125	4.18%
8.3.8	116	3.88%
7.4.2	54	1.80%
8.2.13	45	1.50%
9.0.0	43	1.44%
7.2.0	41	1.37%
7.6.1	36	1.20%
8.3.15	34	1.14%
8.2.4	33	1.10%
8.9.0	31	1.04%
7.0.1	30	1.00%
6.2.1	30	1.00%
Other	363	12.13%
XMail (2,650 servers)
Version	Number of Servers	Percent
1.25	705	26.60%
1.22	653	24.64%
1.24	381	14.38%
1.26	347	13.09%
1.21	161	6.08%
1.23	79	2.98%
1.20	72	2.72%
1.17	62	2.34%
1.12	56	2.11%
Other	134	5.06%
Qmail Toaster (1,833 servers)
Version	Number of Servers	Percent
1.3	1,651	90.07%
1.2	143	7.80%
1.0	27	1.47%
Other	12	0.65%
ArGoSoft (1,571 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	284	18.08%
1.8 (1.8.9.6)	263	16.74%
1.8 (1.8.9.3)	212	13.49%
1.8 (1.8.9.1)	140	8.91%
1.8 (1.8.8.8)	125	7.96%
1.8 (1.8.8.7)	101	6.43%
1.8 (1.8.9.2)	66	4.20%
1.8 (1.8.9.4)	43	2.74%
1.8 (1.8.8.9)	37	2.36%
1.8 (1.8.8.1)	32	2.04%
1.8 (1.8.9.0)	26	1.65%
1.8 (1.8.6.0)	25	1.59%
Other	217	13.81%
GroupWise (1,521 servers)
Version	Number of Servers	Percent
7.0.3	475	31.23%
7.0.2	181	11.90%
6.5.7	173	11.37%
8.0.1	161	10.59%
7.0.1	101	6.64%
6.5.4	86	5.65%
8.0.0	73	4.80%
6.5.6	59	3.88%
6.0.4	50	3.29%
6.5.1	42	2.76%
6.5.5	26	1.71%
7.0	20	1.31%
Other	74	4.87%
SurgeSMTP (1,452 servers)
Version	Number of Servers	Percent
4.2d2-2	241	16.60%
3.9e-1	220	15.15%
4.2d4-4	165	11.36%
4.2a3-3	129	8.88%
4.0u4-4	108	7.44%
3.8k4-4	93	6.40%
3.8i3-3	38	2.62%
3.7b8-8	37	2.55%
3.8f3-3	33	2.27%
3.9c-1	31	2.13%
3.9h-65	28	1.93%
3.6f5-5	28	1.93%
3.5b3-3	22	1.52%
3.9g2-2	21	1.45%
3.8f2-2	20	1.38%
Other	238	16.39%
Trend Micro (1,126 servers)
Version	Number of Servers	Percent
5.7	525	46.63%
5.5	321	28.51%
5.18	169	15.01%
7.0	84	7.46%
7	12	1.07%
Other	15	1.33%
Gordano Messaging Suite (GMS) (617 servers)
Version	Number of Servers	Percent
Other	617	100.00%
Post.Office (597 servers)
Version	Number of Servers	Percent
3.5.3	106	17.76%
4.1.0.2	68	11.39%
4.0.1	51	8.54%
3.5.3J	44	7.37%
3.8.3	26	4.36%
4.1.0.4	20	3.35%
3.9.2.3	19	3.18%
4.1.1	19	3.18%
3.1.2J	18	3.02%
3.6.3	17	2.85%
3.9.1	16	2.68%
3.9.2	15	2.51%
3.6.2	14	2.35%
3.8.7.4	13	2.18%
4.1	12	2.01%
3.1.2	11	1.84%
4.0.0.2	11	1.84%
4.0.0.1	10	1.68%
4.1.0.3	9	1.51%
3.9.0	9	1.51%
3.8.4	9	1.51%
4.0.1.1	8	1.34%
3.9.2.1	8	1.34%
3.9.1.2	7	1.17%
3.9.1.3	7	1.17%
3.5.2	7	1.17%
Other	43	7.20%
MagicMail (468 servers)
Version	Number of Servers	Percent
Other	468	100.00%
Mirapoint (413 servers)
Version	Number of Servers	Percent
3.10.8-GA	45	10.90%
3.8.4-GA	44	10.65%
3.8.3-GA	44	10.65%
3.10.7-GA	39	9.44%
3.10.5-GA	38	9.20%
3.10.4-GA	23	5.57%
4.1.8-GA	22	5.33%
3.10.6-GA	16	3.87%
4.1.3-GA	15	3.63%
3.10.3-GA	14	3.39%
3.8.6-GA	12	2.91%
4.1.4-GA	10	2.42%
3.8.2-GA	9	2.18%
3.8.7a	9	2.18%
3.7.5a-GA	8	1.94%
3.8.5-GA	7	1.69%
4.1.5-GA	7	1.69%
4.1.7a-GA	7	1.69%
4.0.5a	6	1.45%
3.10.2-GA	6	1.45%
3.7.3a-GA	5	1.21%
3.7.4b-GA	5	1.21%
4.1.6-GA	5	1.21%
Other	17	4.12%
VisNetic (346 servers)
Version	Number of Servers	Percent
9.3.2.0	130	37.57%
9.1.4.1	43	12.43%
5.8.6.6	19	5.49%
8.5.0.8	14	4.05%
6.2.2.0	11	3.18%
5.5.8.3	11	3.18%
8.0.3.1	10	2.89%
9.1.4.0	9	2.60%
8.3.5.0	8	2.31%
8.0.3.0	8	2.31%
7.6.1.0	8	2.31%
5.4.5.4	8	2.31%
8.3.6	7	2.02%
5.0.2.3	7	2.02%
7.2.4.1	7	2.02%
5.3.5.0	6	1.73%
8.0.3	6	1.73%
7.2.4.0	4	1.16%
Other	30	8.67%
InterScan VirusWall (343 servers)
Version	Number of Servers	Percent
Other	343	100.00%
NetIQ MailMarshal (196 servers)
Version	Number of Servers	Percent
6.0.3.8	146	74.49%
6.1.3.15	14	7.14%
5.5.6.7	13	6.63%
5.5.6.6	4	2.04%
5.5.6.5	4	2.04%
5.5.4.16	4	2.04%
5.5.3.17	2	1.02%
5.5.4.17	2	1.02%
5.5.5.6	2	1.02%
Other	5	2.55%
Interscan (152 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	26	17.11%
3.81-Build_1022	19	12.50%
3.55 (build 1029)	19	12.50%
3.53 (build 2017)	17	11.18%
3.81-Build_1084	12	7.89%
3.53 (build 1493)	9	5.92%
3.8-Build_3013	9	5.92%
3.53 (build 2011)	7	4.61%
3.55 (build 1020)	7	4.61%
3.53 (build 2013)	6	3.95%
3.52 (build 1375)	3	1.97%
3.53 (build 1494)	2	1.32%
3.81-Build_1055	2	1.32%
3.8-Build_1080	2	1.32%
Other	12	7.89%
Mercury (103 servers)
Version	Number of Servers	Percent
1.48	54	52.43%
3.32	28	27.18%
3.21c	8	7.77%
1.47	3	2.91%
1.44	2	1.94%
3.21	2	1.94%
3.01a	2	1.94%
1.49	2	1.94%
Other	2	1.94%
WebSTAR V (89 servers)
Version	Number of Servers	Percent
5.4.1	29	32.58%
5.4.0	25	28.09%
5.3.4	19	21.35%
5.3.2	7	7.87%
5.3.3	6	6.74%
5.3.0	1	1.12%
5.2.3	1	1.12%
5.3.1	1	1.12%
Other	0	0.00%
Neon Mail Server (86 servers)
Version	Number of Servers	Percent
3.1.3	21	24.42%
3.0.7	18	20.93%
3.0.9	11	12.79%
3.1.4	10	11.63%
3.1.2	9	10.47%
3.1.0	7	8.14%
3.1.5	4	4.65%
3.1.1	2	2.33%
3.0.8	2	2.33%
3.0.6	1	1.16%
3.0.5	1	1.16%
Other	0	0.00%
MessageWall (48 servers)
Version	Number of Servers	Percent
1.0.8	31	64.58%
1.0.11	15	31.25%
1.0.6	1	2.08%
1.1.0	1	2.08%
Other	0	0.00%
ModusMail (47 servers)
Version	Number of Servers	Percent
4.35.477.0	10	21.28%
3.2.315.0	9	19.15%
4.35.480.0	7	14.89%
3.1.302.0	5	10.64%
4.2.420.0	5	10.64%
4.1.361.21	2	4.26%
3.1.293.1	2	4.26%
4.35.480.11	2	4.26%
4.2.425.22	1	2.13%
4.1.361.0	1	2.13%
4.0.340.3	1	2.13%
4.3.459.0	1	2.13%
4.35.477.8	1	2.13%
Other	0	0.00%
WebSTAR (36 servers)
Version	Number of Servers	Percent
Other	36	100.00%
MAILsweeper (28 servers)
Version	Number of Servers	Percent
4.3.20.0	7	25.00%
4.3.14.0	5	17.86%
4.3.1.0	4	14.29%
4.3.17.0	3	10.71%
4.3.6.0	3	10.71%
4.2.10.0	2	7.14%
4.3.19.0	1	3.57%
4.3.10.0	1	3.57%
4.3.12.0	1	3.57%
4.2.5.0	1	3.57%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	16	61.54%
7.3	7	26.92%
8.2	2	7.69%
7.2	1	3.85%
Other	0	0.00%
OpenSMTPD (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%