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	2,136,152	100.0%
Number of Servers that didn't respond	349,955	16.38%
Server didn't open socket	336,396	15.75%
Server didn't provide banner	13,559	0.63%
Server provided banner	1,786,197	83.62%
Server banner identifies software in use	978,782	45.82%

As indicated by the above table, of the 2,136,152 servers queried, only 978,782 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	345,872	35.34%
Postfix	210,566	21.51%
Microsoft	169,291	17.30%
Sendmail	153,141	15.65%
MailEnable	30,887	3.16%
MDaemon	22,668	2.32%
IMail	12,806	1.31%
Lotus Domino	5,291	0.54%
WinWebMail	4,966	0.51%
Kerio	4,389	0.45%
CommuniGate Pro	3,832	0.39%
XMail	2,608	0.27%
Merak	2,530	0.26%
Qmail Toaster	1,770	0.18%
ArGoSoft	1,416	0.14%
SurgeSMTP	1,360	0.14%
GroupWise	1,308	0.13%
Trend Micro	899	0.09%
Gordano Messaging Suite (GMS)	558	0.06%
Post.Office	547	0.06%
MagicMail	461	0.05%
Mirapoint	389	0.04%
InterScan VirusWall	289	0.03%
VisNetic	289	0.03%
NetIQ MailMarshal	150	0.02%
Interscan	120	0.01%
Mercury	88	0.01%
WebSTAR V	76	0.01%
Neon Mail Server	71	0.01%
MessageWall	32	0.00%
ModusMail	32	0.00%
WebSTAR	29	0.00%
OpenVMS	23	0.00%
MAILsweeper	22	0.00%
OpenSMTPD	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (345,872 servers)
Version	Number of Servers	Percent
4.69	295,129	85.33%
4.67	14,278	4.13%
4.63	12,410	3.59%
4.71	6,298	1.82%
4.72	3,838	1.11%
Other	13,919	4.02%
Postfix (210,566 servers)
Version	Number of Servers	Percent
Other	210,566	100.00%
Microsoft (169,291 servers)
Version	Number of Servers	Percent
6.0.3790.4675	101,384	59.89%
6.0.3790.3959	49,066	28.98%
6.0.3790.1830	10,323	6.10%
5.0.2195.6713	2,596	1.53%
5.0.2195.7381	2,560	1.51%
Other	3,362	1.99%
Sendmail (153,141 servers)
Version	Number of Servers	Percent
8.13.1	29,286	19.12%
8.13.8	27,434	17.91%
8.14.3	15,114	9.87%
8.14.4	14,358	9.38%
8.12.11.20060308	10,969	7.16%
8.12.11.20060614	9,584	6.26%
8.13.6.20060614	5,928	3.87%
8.12.10	5,117	3.34%
8.14.2	4,919	3.21%
8.11.6	4,779	3.12%
8.13.6	4,149	2.71%
8.14.1	3,691	2.41%
8.12.11	3,328	2.17%
8.13.4	2,737	1.79%
8.13.7	2,709	1.77%
8.12.8	2,285	1.49%
Other	6,754	4.41%
MailEnable (30,887 servers)
Version	Number of Servers	Percent
1.986--	9,988	32.34%
1.981--	3,045	9.86%
1.983--	1,975	6.39%
3.62--	1,256	4.07%
4.23--	923	2.99%
0-3.63-	907	2.94%
4.22--	784	2.54%
1.96--	583	1.89%
1.95--	530	1.72%
0-4.23-	523	1.69%
0-2.53-	452	1.46%
0-1.87-	447	1.45%
4.23--4.23	436	1.41%
1.9--	433	1.40%
0-4.22-	424	1.37%
--3.63	378	1.22%
4.17--	377	1.22%
0-3.61-	366	1.18%
0-3.6-	335	1.08%
4.14--	330	1.07%
0-3.14-	311	1.01%
Other	6,084	19.70%
MDaemon (22,668 servers)
Version	Number of Servers	Percent
11.0.3	3,693	16.29%
10.1.2	2,113	9.32%
10.0.0	1,361	6.00%
10.1.1	1,200	5.29%
11.0.0	1,111	4.90%
11.0.2	939	4.14%
9.6.1	874	3.86%
9.6.6	790	3.49%
10.1.0	705	3.11%
10.0.5	596	2.63%
11.0.1	572	2.52%
9.6.5	557	2.46%
9.5.2	555	2.45%
10.0.2	498	2.20%
10.0.4	483	2.13%
9.5.1	462	2.04%
9.6.4	452	1.99%
9.6.2	437	1.93%
8.1.3	422	1.86%
9.5.6	412	1.82%
9.0.4	372	1.64%
9.5.5	263	1.16%
9.6.3	261	1.15%
6.8.5	259	1.14%
7.2.3	239	1.05%
Other	3,042	13.42%
IMail (12,806 servers)
Version	Number of Servers	Percent
8.22	2,434	19.01%
8.15	1,260	9.84%
11.01	1,043	8.14%
11.02	977	7.63%
9.23	930	7.26%
10.02	592	4.62%
8.05	580	4.53%
11.0	576	4.50%
9.10	492	3.84%
9.20	484	3.78%
7.07	376	2.94%
9.21	354	2.76%
7.15	298	2.33%
8.00	272	2.12%
10.01	272	2.12%
6.06	245	1.91%
8.04	215	1.68%
8.21	135	1.05%
8.10	130	1.02%
Other	1,141	8.91%
Lotus Domino (5,291 servers)
Version	Number of Servers	Percent
8.5.1	648	12.25%
8.5	428	8.09%
7.0.2	367	6.94%
8.5.1FP3	336	6.35%
8.5.1FP2	224	4.23%
7.0.3	221	4.18%
8.0.2	218	4.12%
8.0.1	201	3.80%
7.0.1	194	3.67%
6.5.4	167	3.16%
6.5.1	152	2.87%
6.5.3	142	2.68%
7.0.3FP1	128	2.42%
7.0	123	2.32%
6.5.5	117	2.21%
7.0.2FP2	117	2.21%
8.0	116	2.19%
8.5.1FP1	101	1.91%
8.5FP1	101	1.91%
6.5	84	1.59%
5.0.11	67	1.27%
7.0.2FP3	57	1.08%
Other	982	18.56%
WinWebMail (4,966 servers)
Version	Number of Servers	Percent
3.8.0.1	1,297	26.12%
3.7.6.1	832	16.75%
3.7.7.3	628	12.65%
3.7.3.1	599	12.06%
3.8.1.1	440	8.86%
3.7.1.1	296	5.96%
3.7.5.1	209	4.21%
3.7.7.1	154	3.10%
3.6.3.1	147	2.96%
3.7.0.5	132	2.66%
3.7.0.3	106	2.13%
3.7.0.7	92	1.85%
Other	34	0.68%
Kerio (4,389 servers)
Version	Number of Servers	Percent
6.7.3	731	16.66%
6.6.2	473	10.78%
6.7.0	449	10.23%
6.7.2	441	10.05%
6.5.0	271	6.17%
6.7.1	250	5.70%
6.5.2	238	5.42%
6.4.1	203	4.63%
6.3.1	191	4.35%
6.5.1	150	3.42%
6.6.0	145	3.30%
6.4.0	140	3.19%
6.4.2	106	2.42%
6.6.1	94	2.14%
6.3.0	78	1.78%
Other	429	9.77%
CommuniGate Pro (3,832 servers)
Version	Number of Servers	Percent
5.1.16	241	6.29%
5.3.8	234	6.11%
4.1.8	214	5.58%
5.2.16	194	5.06%
4.2.10	146	3.81%
5.3.7	143	3.73%
5.2.19	105	2.74%
5.3.5	100	2.61%
5.2.14	94	2.45%
5.1.12	92	2.40%
5.2.3	90	2.35%
5.2.12	85	2.22%
5.3.2	80	2.09%
5.2.8	80	2.09%
5.0.14	80	2.09%
5.1.13	75	1.96%
5.2.13	72	1.88%
5.2.10	68	1.77%
5.2.20	66	1.72%
5.2.18	65	1.70%
5.2.9	53	1.38%
5.1.14	51	1.33%
5.0.9	47	1.23%
5.1.9	47	1.23%
5.2.0	43	1.12%
5.3.4	43	1.12%
5.2.17	40	1.04%
5.2.11	40	1.04%
5.2.6	39	1.02%
4.2.9	39	1.02%
Other	1,066	27.82%
XMail (2,608 servers)
Version	Number of Servers	Percent
1.22	628	24.08%
1.25	626	24.00%
1.26	341	13.08%
1.24	340	13.04%
1.27	179	6.86%
1.21	133	5.10%
1.23	70	2.68%
1.20	67	2.57%
1.17	57	2.19%
1.12	52	1.99%
Other	115	4.41%
Merak (2,530 servers)
Version	Number of Servers	Percent
8.0.3	1,052	41.58%
8.9.1	252	9.96%
8.5.0	156	6.17%
7.4.5	125	4.94%
7.5.2	111	4.39%
7.6.4	102	4.03%
8.3.8	101	3.99%
8.2.13	45	1.78%
7.4.2	43	1.70%
9.0.0	39	1.54%
7.2.0	33	1.30%
7.6.1	33	1.30%
8.2.4	29	1.15%
8.3.15	29	1.15%
7.0.1	28	1.11%
Other	352	13.91%
Qmail Toaster (1,770 servers)
Version	Number of Servers	Percent
1.3	1,624	91.75%
1.2	108	6.10%
1.0	28	1.58%
Other	10	0.56%
ArGoSoft (1,416 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	277	19.56%
1.8 (1.8.9.5)	230	16.24%
1.8 (1.8.9.3)	182	12.85%
1.8 (1.8.9.1)	127	8.97%
1.8 (1.8.8.8)	109	7.70%
1.8 (1.8.8.7)	85	6.00%
1.8 (1.8.9.2)	58	4.10%
1.8 (1.8.9.4)	43	3.04%
1.8 (1.8.8.1)	32	2.26%
1.8 (1.8.8.9)	31	2.19%
1.8 (1.8.9.0)	25	1.77%
1.8 (1.8.6.0)	20	1.41%
Other	197	13.91%
SurgeSMTP (1,360 servers)
Version	Number of Servers	Percent
3.9e-1	149	10.96%
4.3g4-4	132	9.71%
4.2d4-4	128	9.41%
4.3g2-2	120	8.82%
4.3g-1	84	6.18%
3.8k4-4	83	6.10%
4.2d2-2	72	5.29%
4.0u4-4	70	5.15%
4.3e-1	64	4.71%
3.8i3-3	37	2.72%
4.2a3-3	31	2.28%
3.7b8-8	31	2.28%
3.8f3-3	26	1.91%
3.6f5-5	23	1.69%
3.9c-1	21	1.54%
3.9g2-2	18	1.32%
3.8f2-2	18	1.32%
3.9h-18	14	1.03%
Other	239	17.57%
GroupWise (1,308 servers)
Version	Number of Servers	Percent
7.0.3	350	26.76%
8.0.1	169	12.92%
6.5.7	163	12.46%
7.0.2	140	10.70%
7.0.1	69	5.28%
6.5.4	68	5.20%
6.5.6	51	3.90%
8.0.2	49	3.75%
8.0.0	45	3.44%
6.0.4	42	3.21%
6.5.1	35	2.68%
7.0.4	30	2.29%
6.5.5	20	1.53%
7.0	15	1.15%
Other	62	4.74%
Trend Micro (899 servers)
Version	Number of Servers	Percent
5.7	403	44.83%
5.5	252	28.03%
5.18	140	15.57%
7.0	70	7.79%
7	14	1.56%
7.1	9	1.00%
Other	11	1.22%
Gordano Messaging Suite (GMS) (558 servers)
Version	Number of Servers	Percent
Other	558	100.00%
Post.Office (547 servers)
Version	Number of Servers	Percent
3.5.3	90	16.45%
4.1.0.2	67	12.25%
4.0.1	46	8.41%
3.5.3J	30	5.48%
4.1.1	28	5.12%
3.8.3	27	4.94%
4.1.0.4	19	3.47%
3.9.2.3	17	3.11%
3.1.2J	17	3.11%
3.9.1	15	2.74%
3.9.2	13	2.38%
3.6.3	13	2.38%
3.6.2	13	2.38%
3.1.2	11	2.01%
3.8.7.4	11	2.01%
4.1.0.3	10	1.83%
4.0.1.1	10	1.83%
4.0.0.2	10	1.83%
4.1	9	1.65%
4.0.0.1	8	1.46%
3.9.2.1	8	1.46%
3.9.0	7	1.28%
3.9.1.2	6	1.10%
3.9.1.3	6	1.10%
Other	56	10.24%
MagicMail (461 servers)
Version	Number of Servers	Percent
Other	461	100.00%
Mirapoint (389 servers)
Version	Number of Servers	Percent
3.8.4-GA	39	10.03%
3.10.8-GA	37	9.51%
3.10.5-GA	35	9.00%
3.8.3-GA	30	7.71%
3.10.9-GA	29	7.46%
3.10.7-GA	23	5.91%
4.1.9-GA	23	5.91%
4.1.3-GA	19	4.88%
3.10.4-GA	18	4.63%
4.1.8-GA	17	4.37%
3.10.6-GA	14	3.60%
3.10.3-GA	13	3.34%
3.8.7a	9	2.31%
4.1.5-GA	8	2.06%
3.8.2-GA	8	2.06%
4.1.4-GA	8	2.06%
3.8.5-GA	7	1.80%
3.8.6-GA	7	1.80%
4.0.5a	6	1.54%
3.7.5a-GA	6	1.54%
3.10.2-GA	6	1.54%
4.1.7a-GA	4	1.03%
3.7.3a-GA	4	1.03%
3.10.10a-GA	4	1.03%
Other	15	3.86%
InterScan VirusWall (289 servers)
Version	Number of Servers	Percent
Other	289	100.00%
VisNetic (289 servers)
Version	Number of Servers	Percent
9.3.2.0	99	34.26%
9.1.4.1	41	14.19%
5.8.6.6	15	5.19%
8.5.0.8	14	4.84%
5.5.8.3	11	3.81%
8.0.3.1	9	3.11%
8.0.3.0	8	2.77%
7.6.1.0	8	2.77%
6.2.2.0	8	2.77%
9.1.4.0	7	2.42%
8.3.5.0	7	2.42%
8.0.3	7	2.42%
8.3.6	6	2.08%
5.3.5.0	6	2.08%
7.2.4.1	6	2.08%
5.4.5.4	5	1.73%
5.0.2.3	4	1.38%
7.2.4.0	4	1.38%
5.8.6.4	3	1.04%
5.0.2.1	3	1.04%
7.5.3.0	3	1.04%
Other	15	5.19%
NetIQ MailMarshal (150 servers)
Version	Number of Servers	Percent
6.0.3.8	108	72.00%
5.5.6.7	12	8.00%
6.1.3.15	11	7.33%
5.5.6.6	4	2.67%
5.5.4.16	4	2.67%
5.5.6.5	3	2.00%
5.5.3.17	2	1.33%
Other	6	4.00%
Interscan (120 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	18	15.00%
3.81-Build_1022	18	15.00%
3.53 (build 2017)	14	11.67%
3.55 (build 1029)	13	10.83%
3.81-Build_1084	10	8.33%
3.8-Build_3013	9	7.50%
3.53 (build 2011)	7	5.83%
3.53 (build 1493)	6	5.00%
3.55 (build 1020)	6	5.00%
3.53 (build 2013)	3	2.50%
3.52 (build 1375)	3	2.50%
3.8-Build_1080	2	1.67%
Other	11	9.17%
Mercury (88 servers)
Version	Number of Servers	Percent
1.48	44	50.00%
3.32	24	27.27%
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 (76 servers)
Version	Number of Servers	Percent
5.4.1	26	34.21%
5.3.4	18	23.68%
5.4.0	18	23.68%
5.3.2	7	9.21%
5.3.3	5	6.58%
5.3.0	1	1.32%
5.3.1	1	1.32%
Other	0	0.00%
Neon Mail Server (71 servers)
Version	Number of Servers	Percent
3.1.3	19	26.76%
3.0.7	14	19.72%
3.0.9	11	15.49%
3.1.4	10	14.08%
3.1.2	6	8.45%
3.1.0	4	5.63%
3.1.1	3	4.23%
3.1.5	3	4.23%
3.0.6	1	1.41%
Other	0	0.00%
MessageWall (32 servers)
Version	Number of Servers	Percent
1.0.8	29	90.62%
1.0.11	1	3.12%
1.0.6	1	3.12%
1.1.0	1	3.12%
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%
WebSTAR (29 servers)
Version	Number of Servers	Percent
Other	29	100.00%
OpenVMS (23 servers)
Version	Number of Servers	Percent
8.3	14	60.87%
7.3	6	26.09%
8.2	2	8.70%
6.1	1	4.35%
Other	0	0.00%
MAILsweeper (22 servers)
Version	Number of Servers	Percent
4.3.20.0	7	31.82%
4.3.17.0	4	18.18%
4.3.6.0	4	18.18%
4.3.14.0	3	13.64%
4.3.19.0	1	4.55%
4.3.10.0	1	4.55%
4.3.1.0	1	4.55%
4.2.5.0	1	4.55%
Other	0	0.00%
OpenSMTPD (6 servers)
Version	Number of Servers	Percent
Other	6	100.00%