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	1,882,601	100.0%
Number of Servers that didn't respond	302,607	16.07%
Server didn't open socket	290,846	15.45%
Server didn't provide banner	11,761	0.62%
Server provided banner	1,579,994	83.93%
Server banner identifies software in use	925,650	49.17%

As indicated by the above table, of the 1,882,601 servers queried, only 925,650 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
Sendmail	230,830	24.94%
Exim	218,277	23.58%
Microsoft	202,108	21.83%
Postfix	155,205	16.77%
MailEnable	24,623	2.66%
IMail	23,351	2.52%
MDaemon	23,065	2.49%
Lotus Domino	6,580	0.71%
Kerio	5,919	0.64%
Merak	5,630	0.61%
WinWebMail	5,011	0.54%
CommuniGate Pro	4,852	0.52%
Trend Micro	2,848	0.31%
GroupWise	2,782	0.30%
XMail	2,729	0.29%
ArGoSoft	2,491	0.27%
SurgeSMTP	1,767	0.19%
Qmail Toaster	1,721	0.19%
Gordano Messaging Suite (GMS)	938	0.10%
Post.Office	861	0.09%
InterScan VirusWall	625	0.07%
Mirapoint	600	0.06%
NetIQ MailMarshal	580	0.06%
VisNetic	498	0.05%
MagicMail	416	0.04%
Interscan	405	0.04%
WebSTAR V	189	0.02%
Mercury	185	0.02%
Neon Mail Server	183	0.02%
ModusMail	115	0.01%
MessageWall	78	0.01%
WebSTAR	77	0.01%
MAILsweeper	77	0.01%
OpenVMS	34	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (230,830 servers)
Version	Number of Servers	Percent
8.13.1	36,385	15.76%
8.12.11.20060614	33,116	14.35%
8.13.6	22,307	9.66%
8.12.11.20060308	20,888	9.05%
8.13.8	17,990	7.79%
8.11.6	17,808	7.71%
8.12.10	12,882	5.58%
8.13.6.20060614	10,889	4.72%
8.14.1	9,282	4.02%
8.12.11	7,533	3.26%
8.13.4	6,692	2.90%
8.12.8	5,596	2.42%
8.13.7	5,498	2.38%
8.14.2	5,348	2.32%
8.9.3	3,203	1.39%
8.10.2	2,717	1.18%
8.14.3	2,325	1.01%
Other	10,371	4.49%
Exim (218,277 servers)
Version	Number of Servers	Percent
4.68	133,830	61.31%
4.63	26,926	12.34%
4.69	21,486	9.84%
4.67	7,162	3.28%
4.60	5,565	2.55%
4.50	5,244	2.40%
4.66	5,068	2.32%
4.62	4,290	1.97%
Other	8,706	3.99%
Microsoft (202,108 servers)
Version	Number of Servers	Percent
6.0.3790.3959	137,581	68.07%
6.0.3790.1830	38,382	18.99%
5.0.2195.6713	16,311	8.07%
6.0.3790.211	5,792	2.87%
Other	4,042	2.00%
Postfix (155,205 servers)
Version	Number of Servers	Percent
Other	155,205	100.00%
MailEnable (24,623 servers)
Version	Number of Servers	Percent
1.981--	5,898	23.95%
1.983--	3,070	12.47%
1.96--	1,553	6.31%
1.95--	1,422	5.78%
1.9--	1,163	4.72%
0-3.14-	999	4.06%
1.986--	955	3.88%
1.8--	945	3.84%
0-2.37-	795	3.23%
0-1.85-	725	2.94%
0--3.14	518	2.10%
0-2.38-	386	1.57%
0-2.36-	375	1.52%
0-3.04-	345	1.40%
0-2.52-	337	1.37%
0--2.37	274	1.11%
Other	4,863	19.75%
IMail (23,351 servers)
Version	Number of Servers	Percent
8.22	4,910	21.03%
8.15	4,090	17.52%
9.23	2,305	9.87%
8.05	1,425	6.10%
9.10	1,200	5.14%
10.0	1,143	4.89%
7.07	915	3.92%
9.21	883	3.78%
7.15	855	3.66%
9.22	714	3.06%
6.06	625	2.68%
8.00	508	2.18%
9.20	500	2.14%
8.21	424	1.82%
8.04	343	1.47%
8.01	266	1.14%
8.10	260	1.11%
8.20	247	1.06%
Other	1,738	7.44%
MDaemon (23,065 servers)
Version	Number of Servers	Percent
9.6.5	5,708	24.75%
9.6.4	1,744	7.56%
9.6.1	1,466	6.36%
9.6.2	1,169	5.07%
8.1.3	978	4.24%
9.5.6	941	4.08%
9.0.4	846	3.67%
9.6.3	803	3.48%
9.5.2	776	3.36%
9.5.1	674	2.92%
6.8.5	541	2.35%
7.2.3	518	2.25%
7.2.0	445	1.93%
9.0.1	425	1.84%
9.6.6	396	1.72%
9.5.5	341	1.48%
9.0.0	332	1.44%
8.0.2	327	1.42%
8.1.4	322	1.40%
9.5.4	285	1.24%
8.1.1	280	1.21%
9.6.0	266	1.15%
8.1.5	235	1.02%
9.5.3	233	1.01%
Other	3,014	13.07%
Lotus Domino (6,580 servers)
Version	Number of Servers	Percent
7.0.2	775	11.78%
8.0.1	489	7.43%
6.5.4	400	6.08%
7.0.1	398	6.05%
7.0.2FP2	378	5.74%
7.0.3	373	5.67%
6.5.1	331	5.03%
6.5.3	307	4.67%
6.5.5	273	4.15%
8.0	267	4.06%
7.0	265	4.03%
6.5	223	3.39%
7.0.2FP1	200	3.04%
5.0.11	142	2.16%
6.5.2	136	2.07%
7.0.3FP1	116	1.76%
5.0.12	89	1.35%
6.5.6	84	1.28%
5.0.13a	79	1.20%
5.0.8	77	1.17%
7.0.1FP1	72	1.09%
5.0.10	70	1.06%
6.5.5FP2	69	1.05%
Other	967	14.70%
Kerio (5,919 servers)
Version	Number of Servers	Percent
6.5.0	1,396	23.59%
6.5.1	920	15.54%
6.4.1	730	12.33%
6.3.1	599	10.12%
6.4.2	568	9.60%
6.4.0	413	6.98%
6.3.0	228	3.85%
6.1.3	96	1.62%
6.2.2	94	1.59%
6.2.0	89	1.50%
6.1.0	82	1.39%
6.0.10	79	1.33%
6.1.2	72	1.22%
6.1.4	66	1.12%
6.0.3	62	1.05%
Other	425	7.18%
Merak (5,630 servers)
Version	Number of Servers	Percent
8.0.3	2,095	37.21%
8.9.1	619	10.99%
8.5.0	400	7.10%
7.4.5	279	4.96%
8.3.8	255	4.53%
7.5.2	252	4.48%
7.6.4	251	4.46%
7.4.2	130	2.31%
9.0.0	125	2.22%
7.2.0	91	1.62%
8.2.4	84	1.49%
6.2.1	82	1.46%
7.6.1	78	1.39%
8.9.0	66	1.17%
Other	823	14.62%
WinWebMail (5,011 servers)
Version	Number of Servers	Percent
3.7.3.1	1,366	27.26%
3.7.6.1	992	19.80%
3.7.1.1	824	16.44%
3.7.5.1	496	9.90%
3.6.3.1	445	8.88%
3.7.0.5	371	7.40%
3.7.0.3	236	4.71%
3.7.0.7	230	4.59%
Other	51	1.02%
CommuniGate Pro (4,852 servers)
Version	Number of Servers	Percent
4.1.8	448	9.23%
4.2.10	283	5.83%
5.1.13	274	5.65%
5.2.3	247	5.09%
5.1.12	247	5.09%
5.2.0	175	3.61%
5.1.14	166	3.42%
5.1.16	161	3.32%
5.1.10	155	3.19%
5.0.9	152	3.13%
5.0.13	139	2.86%
5.2.2	121	2.49%
5.2.1	112	2.31%
5.1.7	107	2.21%
5.1.8	106	2.18%
5.1.9	103	2.12%
5.1.11	100	2.06%
5.0.14	82	1.69%
4.2.8	78	1.61%
4.2	72	1.48%
4.2.7	69	1.42%
5.1.5	69	1.42%
4.2.9	68	1.40%
4.0.6	61	1.26%
5.0.8	60	1.24%
4.3.12	58	1.20%
5.0.11	58	1.20%
5.1.3	53	1.09%
Other	1,028	21.19%
Trend Micro (2,848 servers)
Version	Number of Servers	Percent
5.7	1,336	46.91%
5.5	986	34.62%
5.18	395	13.87%
7.0	85	2.98%
Other	46	1.62%
GroupWise (2,782 servers)
Version	Number of Servers	Percent
7.0.2	744	26.74%
7.0.3	470	16.89%
6.5.7	320	11.50%
7.0.1	314	11.29%
6.5.4	205	7.37%
6.5.6	143	5.14%
6.0.4	120	4.31%
7.0	85	3.06%
6.5.5	81	2.91%
6.5.1	81	2.91%
6.5.2	39	1.40%
6.5.3	29	1.04%
6.5.0	28	1.01%
Other	123	4.42%
XMail (2,729 servers)
Version	Number of Servers	Percent
1.22	838	30.71%
1.24	571	20.92%
1.25	429	15.72%
1.21	288	10.55%
1.20	139	5.09%
1.17	120	4.40%
1.23	116	4.25%
1.12	80	2.93%
1.16	43	1.58%
Other	105	3.85%
ArGoSoft (2,491 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.3)	478	19.19%
1.8 (1.8.9.1)	339	13.61%
1.8 (1.8.9.5)	249	10.00%
1.8 (1.8.8.8)	247	9.92%
1.8 (1.8.8.7)	217	8.71%
1.8 (1.8.9.2)	153	6.14%
1.8 (1.8.8.9)	89	3.57%
1.8 (1.8.9.4)	86	3.45%
1.8 (1.8.9.0)	50	2.01%
1.8 (1.8.8.1)	49	1.97%
1.8 (1.8.6.0)	47	1.89%
1.8 (1.8.8.2)	42	1.69%
1.8 (1.8.7.5)	27	1.08%
1.8 (1.8.5.9)	26	1.04%
Other	392	15.74%
SurgeSMTP (1,767 servers)
Version	Number of Servers	Percent
3.9e-1	399	22.58%
3.9c-1	358	20.26%
3.8k4-4	262	14.83%
3.8f3-3	88	4.98%
3.7b8-8	86	4.87%
3.8i3-3	79	4.47%
3.6f5-5	68	3.85%
3.5b3-3	56	3.17%
3.8f2-2	47	2.66%
3.0c2-2	40	2.26%
3.7b6-6	30	1.70%
3.8k2-2	21	1.19%
3.8i-1	18	1.02%
Other	215	12.17%
Qmail Toaster (1,721 servers)
Version	Number of Servers	Percent
1.3	1,345	78.15%
1.2	298	17.32%
1.0	63	3.66%
Other	15	0.87%
Gordano Messaging Suite (GMS) (938 servers)
Version	Number of Servers	Percent
Other	938	100.00%
Post.Office (861 servers)
Version	Number of Servers	Percent
3.5.3	218	25.32%
4.0.1	86	9.99%
3.5.3J	63	7.32%
3.8.3	48	5.57%
3.6.3	44	5.11%
3.6.2	33	3.83%
3.9.1	29	3.37%
3.9.2.3	28	3.25%
4.1.0.2	26	3.02%
3.1.2J	26	3.02%
3.9.2	22	2.56%
3.1.2	21	2.44%
3.9.0	21	2.44%
3.8.4	20	2.32%
3.8.7.4	20	2.32%
3.5.2	14	1.63%
4.1	13	1.51%
4.0.0.2	12	1.39%
3.8.2	11	1.28%
3.9.1.3	11	1.28%
3.9.2.1	11	1.28%
4.0.0.1	11	1.28%
3.6.0	9	1.05%
Other	64	7.43%
InterScan VirusWall (625 servers)
Version	Number of Servers	Percent
Other	625	100.00%
Mirapoint (600 servers)
Version	Number of Servers	Percent
3.8.4-GA	115	19.17%
3.8.3-GA	96	16.00%
3.8.6-GA	86	14.33%
3.8.5-GA	66	11.00%
3.7.5a-GA	51	8.50%
3.8.2-GA	33	5.50%
3.8.7a	27	4.50%
3.7.3a-GA	23	3.83%
3.7.4b-GA	23	3.83%
3.7.5-GA	12	2.00%
3.5.8-GR	10	1.67%
1.1.0	8	1.33%
4.0.5a	7	1.17%
Other	43	7.17%
NetIQ MailMarshal (580 servers)
Version	Number of Servers	Percent
6.0.3.8	442	76.21%
6.1.3.15	34	5.86%
5.5.6.7	34	5.86%
5.5.6.6	14	2.41%
5.5.5.9	13	2.24%
5.5.4.16	11	1.90%
5.5.6.5	9	1.55%
5.5.5.6	7	1.21%
Other	16	2.76%
VisNetic (498 servers)
Version	Number of Servers	Percent
9.1.4.1	112	22.49%
9.1.4.0	50	10.04%
8.5.0.8	34	6.83%
5.8.6.6	27	5.42%
8.3.5.0	24	4.82%
7.2.4.1	24	4.82%
5.0.2.3	23	4.62%
8.0.3.0	22	4.42%
8.0.3.1	18	3.61%
5.5.8.3	18	3.61%
6.2.2.0	17	3.41%
5.3.5.0	15	3.01%
7.6.1.0	14	2.81%
8.3.6	12	2.41%
8.0.3	11	2.21%
7.5.3.0	11	2.21%
5.4.5.4	9	1.81%
7.2.4.0	7	1.41%
5.8.6.4	6	1.20%
8.5.0.5	6	1.20%
8.3.0.1	6	1.20%
Other	32	6.43%
MagicMail (416 servers)
Version	Number of Servers	Percent
Other	416	100.00%
Interscan (405 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	75	18.52%
3.81-Build_1022	59	14.57%
3.55 (build 1029)	41	10.12%
3.53 (build 2017)	40	9.88%
3.53 (build 2011)	29	7.16%
3.8-Build_3013	25	6.17%
3.53 (build 1493)	20	4.94%
3.81-Build_1084	18	4.44%
3.53 (build 2013)	18	4.44%
3.55 (build 1020)	13	3.21%
3.52 (build 1375)	12	2.96%
3.8-Build_1080	7	1.73%
3.8-Build_3065	5	1.23%
3.55 (build 1018)	5	1.23%
Other	38	9.38%
WebSTAR V (189 servers)
Version	Number of Servers	Percent
5.4.1	59	31.22%
5.4.0	45	23.81%
5.3.4	43	22.75%
5.3.3	20	10.58%
5.3.2	15	7.94%
5.3.0	5	2.65%
Other	2	1.06%
Mercury (185 servers)
Version	Number of Servers	Percent
1.48	85	45.95%
3.32	60	32.43%
3.21c	18	9.73%
1.44	5	2.70%
1.47	5	2.70%
3.31	5	2.70%
1.49	2	1.08%
3.21	2	1.08%
Other	3	1.62%
Neon Mail Server (183 servers)
Version	Number of Servers	Percent
3.1.3	45	24.59%
3.0.7	37	20.22%
3.0.9	33	18.03%
3.1.2	31	16.94%
3.1.0	22	12.02%
3.0.8	5	2.73%
3.0.6	4	2.19%
3.1.1	3	1.64%
3.0.5	2	1.09%
Other	1	0.55%
ModusMail (115 servers)
Version	Number of Servers	Percent
4.35.480.0	37	32.17%
3.2.315.0	17	14.78%
4.35.477.0	12	10.43%
4.35.480.11	7	6.09%
4.3.459.0	7	6.09%
3.1.302.0	6	5.22%
4.1.361.0	4	3.48%
4.2.420.0	4	3.48%
4.1.361.21	3	2.61%
4.0.340.0	3	2.61%
3.1.293.1	2	1.74%
4.2.425.4	2	1.74%
4.2.420.1	2	1.74%
4.4.568.0	2	1.74%
Other	7	6.09%
MessageWall (78 servers)
Version	Number of Servers	Percent
1.0.8	60	76.92%
1.0.11	16	20.51%
1.1.0	2	2.56%
Other	0	0.00%
WebSTAR (77 servers)
Version	Number of Servers	Percent
Other	77	100.00%
MAILsweeper (77 servers)
Version	Number of Servers	Percent
4.3.20.0	19	24.68%
4.3.17.0	13	16.88%
4.3.14.0	11	14.29%
4.3.19.0	10	12.99%
4.3.1.0	6	7.79%
4.2.10.0	5	6.49%
4.3.6.0	4	5.19%
4.3.12.0	4	5.19%
4.3.10.0	2	2.60%
4.2.1.0	1	1.30%
4.2.5.0	1	1.30%
4.1.5.0	1	1.30%
Other	0	0.00%
OpenVMS (34 servers)
Version	Number of Servers	Percent
8.3	14	41.18%
7.3	9	26.47%
8.2	6	17.65%
7.2	4	11.76%
6.1	1	2.94%
Other	0	0.00%