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	2,143,520	100.0%
Number of Servers that didn't respond	343,737	16.04%
Server didn't open socket	331,086	15.45%
Server didn't provide banner	12,651	0.59%
Server provided banner	1,799,783	83.96%
Server banner identifies software in use	985,205	45.96%

As indicated by the above table, of the 2,143,520 servers queried, only 985,205 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	353,898	35.92%
Postfix	212,797	21.60%
Microsoft	167,663	17.02%
Sendmail	151,249	15.35%
MailEnable	31,260	3.17%
MDaemon	22,676	2.30%
IMail	12,703	1.29%
Lotus Domino	5,277	0.54%
WinWebMail	4,941	0.50%
Kerio	4,135	0.42%
CommuniGate Pro	3,827	0.39%
XMail	2,599	0.26%
Merak	2,445	0.25%
Qmail Toaster	1,763	0.18%
ArGoSoft	1,401	0.14%
SurgeSMTP	1,345	0.14%
GroupWise	1,266	0.13%
Trend Micro	849	0.09%
Gordano Messaging Suite (GMS)	547	0.06%
Post.Office	542	0.06%
MagicMail	444	0.05%
Mirapoint	376	0.04%
InterScan VirusWall	285	0.03%
VisNetic	282	0.03%
NetIQ MailMarshal	143	0.01%
Interscan	120	0.01%
Mercury	88	0.01%
WebSTAR V	75	0.01%
Neon Mail Server	67	0.01%
ModusMail	32	0.00%
MessageWall	31	0.00%
WebSTAR	28	0.00%
OpenVMS	24	0.00%
MAILsweeper	21	0.00%
OpenSMTPD	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (353,898 servers)
Version	Number of Servers	Percent
4.69	302,646	85.52%
4.67	14,363	4.06%
4.63	12,201	3.45%
4.71	5,785	1.63%
4.72	5,327	1.51%
Other	13,576	3.84%
Postfix (212,797 servers)
Version	Number of Servers	Percent
Other	212,797	100.00%
Microsoft (167,663 servers)
Version	Number of Servers	Percent
6.0.3790.4675	104,918	62.58%
6.0.3790.3959	44,668	26.64%
6.0.3790.1830	9,839	5.87%
5.0.2195.7381	2,526	1.51%
5.0.2195.6713	2,381	1.42%
Other	3,331	1.99%
Sendmail (151,249 servers)
Version	Number of Servers	Percent
8.13.1	28,974	19.16%
8.13.8	28,087	18.57%
8.14.3	15,132	10.00%
8.14.4	14,917	9.86%
8.12.11.20060308	9,410	6.22%
8.12.11.20060614	9,171	6.06%
8.13.6.20060614	5,872	3.88%
8.12.10	5,070	3.35%
8.14.2	4,825	3.19%
8.11.6	4,658	3.08%
8.13.6	4,190	2.77%
8.14.1	3,640	2.41%
8.12.11	3,204	2.12%
8.13.4	2,666	1.76%
8.13.7	2,634	1.74%
8.12.8	2,208	1.46%
Other	6,591	4.36%
MailEnable (31,260 servers)
Version	Number of Servers	Percent
1.986--	10,258	32.82%
1.981--	3,012	9.64%
1.983--	1,945	6.22%
3.62--	1,233	3.94%
4.23--	923	2.95%
0-3.63-	915	2.93%
4.22--	754	2.41%
1.96--	550	1.76%
1.95--	511	1.63%
0-4.23-	467	1.49%
0-1.87-	453	1.45%
0-2.53-	451	1.44%
1.9--	417	1.33%
--3.63	388	1.24%
0-4.22-	373	1.19%
4.17--	367	1.17%
0-3.61-	351	1.12%
4.14--	345	1.10%
0-3.6-	325	1.04%
4.23--4.23	319	1.02%
Other	6,903	22.08%
MDaemon (22,676 servers)
Version	Number of Servers	Percent
11.0.3	4,408	19.44%
10.1.2	2,029	8.95%
10.0.0	1,330	5.87%
10.1.1	1,160	5.12%
11.0.0	1,112	4.90%
9.6.1	855	3.77%
9.6.6	763	3.36%
11.0.2	730	3.22%
10.1.0	705	3.11%
10.0.5	582	2.57%
9.6.5	546	2.41%
9.5.2	545	2.40%
10.0.2	502	2.21%
11.0.1	494	2.18%
10.0.4	468	2.06%
9.5.1	441	1.94%
9.6.4	439	1.94%
9.6.2	429	1.89%
8.1.3	414	1.83%
9.5.6	405	1.79%
9.0.4	366	1.61%
9.6.3	259	1.14%
9.5.5	254	1.12%
6.8.5	244	1.08%
Other	3,196	14.09%
IMail (12,703 servers)
Version	Number of Servers	Percent
8.22	2,415	19.01%
8.15	1,218	9.59%
11.02	1,083	8.53%
11.01	999	7.86%
9.23	935	7.36%
10.02	581	4.57%
8.05	577	4.54%
11.0	560	4.41%
9.20	497	3.91%
9.10	486	3.83%
7.07	357	2.81%
9.21	350	2.76%
7.15	295	2.32%
8.00	280	2.20%
10.01	265	2.09%
6.06	254	2.00%
8.04	205	1.61%
8.10	131	1.03%
8.01	131	1.03%
Other	1,084	8.53%
Lotus Domino (5,277 servers)
Version	Number of Servers	Percent
8.5.1	617	11.69%
8.5	407	7.71%
7.0.2	360	6.82%
8.5.1FP3	297	5.63%
7.0.3	222	4.21%
8.0.2	206	3.90%
8.0.1	203	3.85%
7.0.1	191	3.62%
8.5.1FP2	184	3.49%
6.5.4	159	3.01%
6.5.1	153	2.90%
6.5.3	135	2.56%
7.0.3FP1	123	2.33%
8.5.1FP4	123	2.33%
6.5.5	120	2.27%
7.0	116	2.20%
8.0	114	2.16%
7.0.2FP2	107	2.03%
8.5.2	105	1.99%
8.5FP1	97	1.84%
8.5.1FP1	93	1.76%
6.5	88	1.67%
5.0.11	64	1.21%
Other	993	18.82%
WinWebMail (4,941 servers)
Version	Number of Servers	Percent
3.8.0.1	1,225	24.79%
3.7.6.1	817	16.54%
3.7.3.1	600	12.14%
3.7.7.3	587	11.88%
3.8.1.1	501	10.14%
3.7.1.1	290	5.87%
3.7.5.1	202	4.09%
3.7.7.1	153	3.10%
3.6.3.1	145	2.93%
3.7.0.5	130	2.63%
3.7.0.3	99	2.00%
3.7.0.7	85	1.72%
3.8.1.3	75	1.52%
Other	32	0.65%
Kerio (4,135 servers)
Version	Number of Servers	Percent
6.7.3	654	15.82%
6.6.2	440	10.64%
6.7.0	432	10.45%
6.7.2	384	9.29%
6.5.0	260	6.29%
6.7.1	238	5.76%
6.5.2	234	5.66%
6.4.1	195	4.72%
6.3.1	187	4.52%
6.5.1	143	3.46%
6.6.0	142	3.43%
6.4.0	135	3.26%
6.4.2	102	2.47%
6.6.1	92	2.22%
6.3.0	70	1.69%
Other	427	10.33%
CommuniGate Pro (3,827 servers)
Version	Number of Servers	Percent
5.1.16	249	6.51%
5.3.8	242	6.32%
4.1.8	212	5.54%
5.2.16	191	4.99%
4.2.10	145	3.79%
5.3.7	125	3.27%
5.2.19	102	2.67%
5.3.5	96	2.51%
5.1.12	94	2.46%
5.2.14	92	2.40%
5.2.3	90	2.35%
5.2.12	85	2.22%
5.3.2	79	2.06%
5.0.14	79	2.06%
5.1.13	74	1.93%
5.2.8	73	1.91%
5.2.13	71	1.86%
5.2.20	65	1.70%
5.2.10	64	1.67%
5.2.18	64	1.67%
5.3.9	61	1.59%
5.1.9	49	1.28%
5.0.9	47	1.23%
5.1.14	47	1.23%
5.2.11	46	1.20%
5.2.9	45	1.18%
5.3.4	40	1.05%
5.2.0	39	1.02%
5.2.17	39	1.02%
Other	1,122	29.32%
XMail (2,599 servers)
Version	Number of Servers	Percent
1.22	625	24.05%
1.25	617	23.74%
1.26	343	13.20%
1.24	336	12.93%
1.27	200	7.70%
1.21	130	5.00%
1.23	72	2.77%
1.20	64	2.46%
1.17	57	2.19%
1.12	49	1.89%
Other	106	4.08%
Merak (2,445 servers)
Version	Number of Servers	Percent
8.0.3	996	40.74%
8.9.1	246	10.06%
8.5.0	155	6.34%
7.4.5	114	4.66%
7.5.2	112	4.58%
7.6.4	102	4.17%
8.3.8	98	4.01%
8.2.13	47	1.92%
7.4.2	42	1.72%
9.0.0	39	1.60%
7.2.0	33	1.35%
7.6.1	32	1.31%
8.3.15	29	1.19%
8.2.4	27	1.10%
7.0.1	26	1.06%
8.9.0	26	1.06%
Other	321	13.13%
Qmail Toaster (1,763 servers)
Version	Number of Servers	Percent
1.3	1,622	92.00%
1.2	103	5.84%
1.0	28	1.59%
Other	10	0.57%
ArGoSoft (1,401 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	276	19.70%
1.8 (1.8.9.5)	231	16.49%
1.8 (1.8.9.3)	183	13.06%
1.8 (1.8.9.1)	125	8.92%
1.8 (1.8.8.8)	111	7.92%
1.8 (1.8.8.7)	82	5.85%
1.8 (1.8.9.2)	59	4.21%
1.8 (1.8.9.4)	38	2.71%
1.8 (1.8.8.9)	31	2.21%
1.8 (1.8.8.1)	31	2.21%
1.8 (1.8.9.0)	22	1.57%
1.8 (1.8.6.0)	19	1.36%
Other	193	13.78%
SurgeSMTP (1,345 servers)
Version	Number of Servers	Percent
3.9e-1	140	10.41%
4.3g4-4	137	10.19%
4.3g2-2	96	7.14%
4.2d4-4	96	7.14%
5.0e3-3	87	6.47%
3.8k4-4	79	5.87%
4.3g-1	78	5.80%
4.0u4-4	64	4.76%
4.2d2-2	63	4.68%
4.3e-1	55	4.09%
3.8i3-3	36	2.68%
4.2a3-3	31	2.30%
3.7b8-8	30	2.23%
3.8f3-3	26	1.93%
3.6f5-5	25	1.86%
3.9c-1	21	1.56%
5.0g3-3	17	1.26%
3.9g2-2	17	1.26%
3.8f2-2	16	1.19%
3.9h-18	14	1.04%
Other	217	16.13%
GroupWise (1,266 servers)
Version	Number of Servers	Percent
7.0.3	340	26.86%
6.5.7	154	12.16%
8.0.1	146	11.53%
7.0.2	132	10.43%
8.0.2	74	5.85%
7.0.1	67	5.29%
6.5.4	61	4.82%
6.5.6	50	3.95%
8.0.0	41	3.24%
6.0.4	40	3.16%
6.5.1	33	2.61%
7.0.4	32	2.53%
6.5.5	20	1.58%
7.0	15	1.18%
Other	61	4.82%
Trend Micro (849 servers)
Version	Number of Servers	Percent
5.7	370	43.58%
5.5	238	28.03%
5.18	134	15.78%
7.0	71	8.36%
7.1	13	1.53%
7	13	1.53%
Other	10	1.18%
Gordano Messaging Suite (GMS) (547 servers)
Version	Number of Servers	Percent
Other	547	100.00%
Post.Office (542 servers)
Version	Number of Servers	Percent
3.5.3	95	17.53%
4.1.0.2	63	11.62%
4.0.1	45	8.30%
3.5.3J	31	5.72%
4.1.1	30	5.54%
3.8.3	25	4.61%
4.1.0.4	19	3.51%
3.1.2J	17	3.14%
3.9.2.3	16	2.95%
3.9.1	14	2.58%
3.6.2	13	2.40%
3.9.2	12	2.21%
3.8.7.4	12	2.21%
3.1.2	11	2.03%
4.1.0.3	11	2.03%
4.0.1.1	10	1.85%
3.6.3	10	1.85%
4.0.0.2	10	1.85%
4.1	9	1.66%
3.9.0	7	1.29%
4.0.0.1	7	1.29%
3.9.2.1	7	1.29%
3.5.2	7	1.29%
3.9.1.2	6	1.11%
3.9.1.3	6	1.11%
Other	49	9.04%
MagicMail (444 servers)
Version	Number of Servers	Percent
Other	444	100.00%
Mirapoint (376 servers)
Version	Number of Servers	Percent
3.10.8-GA	36	9.57%
3.8.4-GA	35	9.31%
3.10.5-GA	33	8.78%
3.8.3-GA	28	7.45%
3.10.9-GA	26	6.91%
3.10.7-GA	23	6.12%
3.10.4-GA	20	5.32%
4.1.9-GA	19	5.05%
4.1.8-GA	19	5.05%
4.1.3-GA	17	4.52%
3.10.6-GA	14	3.72%
3.10.3-GA	13	3.46%
3.10.10a-GA	8	2.13%
3.8.2-GA	8	2.13%
4.1.4-GA	8	2.13%
3.8.7a	8	2.13%
3.8.5-GA	7	1.86%
3.10.2-GA	6	1.60%
3.8.6-GA	6	1.60%
3.7.3a-GA	5	1.33%
4.1.5-GA	5	1.33%
3.7.5a-GA	5	1.33%
4.0.5a	4	1.06%
4.1.10-GA	4	1.06%
Other	19	5.05%
InterScan VirusWall (285 servers)
Version	Number of Servers	Percent
Other	285	100.00%
VisNetic (282 servers)
Version	Number of Servers	Percent
9.3.2.0	98	34.75%
9.1.4.1	40	14.18%
5.8.6.6	15	5.32%
8.5.0.8	13	4.61%
5.5.8.3	11	3.90%
8.0.3.1	9	3.19%
6.2.2.0	8	2.84%
8.0.3.0	8	2.84%
8.3.5.0	7	2.48%
9.1.4.0	7	2.48%
8.0.3	7	2.48%
7.6.1.0	7	2.48%
7.2.4.1	6	2.13%
5.4.5.4	6	2.13%
8.3.6	5	1.77%
5.3.5.0	5	1.77%
5.0.2.3	4	1.42%
7.2.4.0	4	1.42%
5.8.6.4	3	1.06%
Other	19	6.74%
NetIQ MailMarshal (143 servers)
Version	Number of Servers	Percent
6.0.3.8	103	72.03%
6.1.3.15	11	7.69%
5.5.6.7	10	6.99%
5.5.6.6	4	2.80%
5.5.4.16	4	2.80%
5.5.6.5	3	2.10%
5.5.3.17	2	1.40%
Other	6	4.20%
Interscan (120 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	21	17.50%
3.81-Build_1022	16	13.33%
3.53 (build 2017)	15	12.50%
3.55 (build 1029)	11	9.17%
3.81-Build_1084	10	8.33%
3.8-Build_3013	9	7.50%
3.55 (build 1020)	6	5.00%
3.53 (build 1493)	5	4.17%
3.53 (build 2011)	4	3.33%
3.52 (build 1375)	4	3.33%
3.53 (build 2013)	3	2.50%
3.53 (build 1494)	2	1.67%
3.8-Build_1080	2	1.67%
Other	12	10.00%
Mercury (88 servers)
Version	Number of Servers	Percent
1.48	46	52.27%
3.32	22	25.00%
3.21c	8	9.09%
3.21	2	2.27%
3.01a	2	2.27%
1.47	2	2.27%
1.49	2	2.27%
3.30	2	2.27%
1.44	1	1.14%
3.31	1	1.14%
Other	0	0.00%
WebSTAR V (75 servers)
Version	Number of Servers	Percent
5.4.1	26	34.67%
5.4.0	18	24.00%
5.3.4	17	22.67%
5.3.2	7	9.33%
5.3.3	5	6.67%
5.3.0	1	1.33%
5.3.1	1	1.33%
Other	0	0.00%
Neon Mail Server (67 servers)
Version	Number of Servers	Percent
3.1.3	18	26.87%
3.0.7	14	20.90%
3.1.4	9	13.43%
3.0.9	8	11.94%
3.1.2	6	8.96%
3.1.0	4	5.97%
3.1.1	3	4.48%
3.1.5	3	4.48%
3.0.8	1	1.49%
3.0.6	1	1.49%
Other	0	0.00%
ModusMail (32 servers)
Version	Number of Servers	Percent
4.35.477.0	9	28.12%
4.2.420.0	5	15.62%
4.35.480.0	4	12.50%
4.1.361.21	2	6.25%
3.2.315.0	2	6.25%
3.1.293.1	2	6.25%
3.1.302.0	2	6.25%
4.35.480.11	2	6.25%
4.2.425.22	1	3.12%
4.0.340.3	1	3.12%
4.3.459.0	1	3.12%
4.35.477.8	1	3.12%
Other	0	0.00%
MessageWall (31 servers)
Version	Number of Servers	Percent
1.0.8	29	93.55%
1.0.6	1	3.23%
1.1.0	1	3.23%
Other	0	0.00%
WebSTAR (28 servers)
Version	Number of Servers	Percent
Other	28	100.00%
OpenVMS (24 servers)
Version	Number of Servers	Percent
8.3	14	58.33%
7.3	6	25.00%
8.2	2	8.33%
6.1	1	4.17%
7.2	1	4.17%
Other	0	0.00%
MAILsweeper (21 servers)
Version	Number of Servers	Percent
4.3.20.0	6	28.57%
4.3.17.0	4	19.05%
4.3.6.0	4	19.05%
4.3.14.0	3	14.29%
4.3.19.0	1	4.76%
4.3.10.0	1	4.76%
4.3.1.0	1	4.76%
4.2.5.0	1	4.76%
Other	0	0.00%
OpenSMTPD (6 servers)
Version	Number of Servers	Percent
Other	6	100.00%