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	1,759,849	100.0%
Number of Servers that didn't respond	264,296	15.02%
Server didn't open socket	254,257	14.45%
Server didn't provide banner	10,039	0.57%
Server provided banner	1,495,553	84.98%
Server banner identifies software in use	907,140	51.55%

As indicated by the above table, of the 1,759,849 servers queried, only 907,140 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	259,747	28.63%
Microsoft	199,716	22.02%
Exim	183,778	20.26%
Postfix	136,450	15.04%
IMail	29,234	3.22%
MDaemon	22,113	2.44%
MailEnable	21,334	2.35%
Merak	8,480	0.93%
Lotus Domino	7,426	0.82%
CommuniGate Pro	5,167	0.57%
Kerio	4,935	0.54%
WinWebMail	4,443	0.49%
Trend Micro	4,148	0.46%
GroupWise	3,437	0.38%
ArGoSoft	2,899	0.32%
XMail	2,536	0.28%
SurgeSMTP	1,832	0.20%
Qmail Toaster	1,488	0.16%
Gordano Messaging Suite (GMS)	1,295	0.14%
Post.Office	1,080	0.12%
NetIQ MailMarshal	939	0.10%
InterScan VirusWall	920	0.10%
Interscan	780	0.09%
VisNetic	581	0.06%
Mirapoint	554	0.06%
ModusMail	439	0.05%
MagicMail	303	0.03%
WebSTAR V	252	0.03%
Mercury	237	0.03%
Neon Mail Server	183	0.02%
MAILsweeper	152	0.02%
MessageWall	115	0.01%
WebSTAR	111	0.01%
OpenVMS	36	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (259,747 servers)
Version	Number of Servers	Percent
8.12.11.20060614	43,628	16.80%
8.12.11.20060308	32,341	12.45%
8.13.1	26,235	10.10%
8.11.6	25,080	9.66%
8.13.6	24,902	9.59%
8.12.10	17,544	6.75%
8.13.8	14,945	5.75%
8.12.11	10,694	4.12%
8.13.6.20060614	10,216	3.93%
8.13.4	8,796	3.39%
8.14.1	8,403	3.24%
8.12.8	7,697	2.96%
8.13.7	5,888	2.27%
8.10.2	4,582	1.76%
8.9.3	4,540	1.75%
Other	14,256	5.49%
Microsoft (199,716 servers)
Version	Number of Servers	Percent
6.0.3790.3959	86,691	43.41%
6.0.3790.1830	70,496	35.30%
5.0.2195.6713	25,152	12.59%
6.0.3790.211	10,906	5.46%
Other	6,471	3.24%
Exim (183,778 servers)
Version	Number of Servers	Percent
4.68	80,743	43.94%
4.63	46,584	25.35%
4.66	18,036	9.81%
4.50	8,364	4.55%
4.60	7,623	4.15%
4.67	4,473	2.43%
4.52	3,990	2.17%
4.62	3,930	2.14%
Other	10,035	5.46%
Postfix (136,450 servers)
Version	Number of Servers	Percent
Other	136,450	100.00%
IMail (29,234 servers)
Version	Number of Servers	Percent
8.22	5,587	19.11%
8.15	5,050	17.27%
8.05	3,270	11.19%
9.10	2,546	8.71%
9.21	2,012	6.88%
9.20	1,613	5.52%
7.15	1,211	4.14%
7.07	1,208	4.13%
6.06	894	3.06%
8.21	693	2.37%
8.00	646	2.21%
8.10	441	1.51%
8.20	430	1.47%
8.12	324	1.11%
8.02	318	1.09%
8.04	293	1.00%
Other	2,698	9.23%
MDaemon (22,113 servers)
Version	Number of Servers	Percent
9.6.2	4,423	20.00%
9.5.6	1,860	8.41%
9.6.1	1,502	6.79%
8.1.3	1,249	5.65%
9.0.4	1,106	5.00%
6.8.5	760	3.44%
9.5.2	702	3.17%
9.5.1	671	3.03%
7.2.3	666	3.01%
9.6.0	573	2.59%
7.2.0	551	2.49%
9.0.1	531	2.40%
9.5.5	492	2.22%
9.5.4	491	2.22%
8.1.4	465	2.10%
9.0.0	444	2.01%
8.0.2	431	1.95%
9.5.3	367	1.66%
8.1.1	364	1.65%
7.1.2	306	1.38%
8.1.5	302	1.37%
8.0.3	298	1.35%
9.0.7	291	1.32%
7.1.0	267	1.21%
7.2.2	254	1.15%
9.0.6	244	1.10%
7.2.1	237	1.07%
6.8.4	227	1.03%
Other	2,039	9.22%
MailEnable (21,334 servers)
Version	Number of Servers	Percent
1.981--	4,624	21.67%
1.96--	2,012	9.43%
1.95--	1,639	7.68%
1.9--	1,532	7.18%
1.8--	1,449	6.79%
0-2.37-	1,374	6.44%
0-1.85-	1,105	5.18%
0-2.38-	953	4.47%
1.983--	909	4.26%
0--2.37	658	3.08%
0-2.36-	613	2.87%
0--2.38	576	2.70%
0-1.841-	281	1.32%
Other	3,609	16.92%
Merak (8,480 servers)
Version	Number of Servers	Percent
8.0.3	1,974	23.28%
8.9.1	1,606	18.94%
9.0.0	1,004	11.84%
8.5.0	673	7.94%
8.3.8	339	4.00%
7.4.5	336	3.96%
7.5.2	309	3.64%
7.6.4	279	3.29%
7.4.2	171	2.02%
7.2.0	141	1.66%
8.9.0	137	1.62%
8.2.4	131	1.54%
6.2.1	90	1.06%
Other	1,290	15.21%
Lotus Domino (7,426 servers)
Version	Number of Servers	Percent
7.0.2	943	12.70%
7.0.1	550	7.41%
6.5.4	548	7.38%
6.5.1	519	6.99%
7.0.2FP2	456	6.14%
6.5.3	406	5.47%
6.5.5	365	4.92%
7.0	347	4.67%
7.0.2FP1	347	4.67%
6.5	285	3.84%
6.5.2	221	2.98%
5.0.11	216	2.91%
5.0.12	147	1.98%
7.0.1FP1	131	1.76%
6.5.5FP2	128	1.72%
5.0.8	127	1.71%
5.0.10	120	1.62%
5.0.13a	115	1.55%
6.0.2CF1	101	1.36%
8.0	99	1.33%
6.5.4FP3	89	1.20%
6.5.4FP2	87	1.17%
6.0	82	1.10%
6.0.3	80	1.08%
Other	917	12.35%
CommuniGate Pro (5,167 servers)
Version	Number of Servers	Percent
4.1.8	628	12.15%
4.2.10	426	8.24%
5.1.11	272	5.26%
5.1.10	261	5.05%
5.0.9	214	4.14%
5.1.9	207	4.01%
5.1.12	201	3.89%
5.0.13	188	3.64%
5.1.8	159	3.08%
5.1.7	154	2.98%
4.3.12	123	2.38%
4.2.8	116	2.25%
4.2	107	2.07%
4.2.7	105	2.03%
5.0.8	101	1.95%
4.0.1	95	1.84%
5.0.11	93	1.80%
4.2.9	92	1.78%
5.1.5	83	1.61%
5.1.3	83	1.61%
4.0.6	78	1.51%
5.1.6	73	1.41%
5.1.4	64	1.24%
4.3.8	61	1.18%
5.1.2	60	1.16%
3.5.9	57	1.10%
5.1.1	53	1.03%
Other	1,013	19.61%
Kerio (4,935 servers)
Version	Number of Servers	Percent
6.3.1	1,089	22.07%
6.4.1	1,045	21.18%
6.4.0	924	18.72%
6.3.0	338	6.85%
6.2.2	160	3.24%
6.1.3	132	2.67%
6.1.2	129	2.61%
6.2.0	129	2.61%
6.1.0	125	2.53%
6.0.10	104	2.11%
6.1.4	100	2.03%
6.0.3	78	1.58%
6.1.1	62	1.26%
6.0.8	54	1.09%
6.2.1	52	1.05%
Other	414	8.39%
WinWebMail (4,443 servers)
Version	Number of Servers	Percent
3.7.3.1	1,749	39.37%
3.7.1.1	969	21.81%
3.6.3.1	640	14.40%
3.7.0.5	456	10.26%
3.7.0.7	298	6.71%
3.7.0.3	277	6.23%
Other	54	1.22%
Trend Micro (4,148 servers)
Version	Number of Servers	Percent
5.7	1,831	44.14%
5.5	1,752	42.24%
5.18	450	10.85%
7.0	48	1.16%
Other	67	1.62%
GroupWise (3,437 servers)
Version	Number of Servers	Percent
7.0.2	848	24.67%
7.0.1	618	17.98%
6.5.7	412	11.99%
6.5.4	300	8.73%
6.5.6	215	6.26%
6.0.4	203	5.91%
7.0	157	4.57%
6.5.5	147	4.28%
6.5.1	126	3.67%
6.5.3	61	1.77%
6.0.2	58	1.69%
6.5.2	57	1.66%
6.0.3	56	1.63%
5.5.5	49	1.43%
6.5.0	35	1.02%
Other	95	2.76%
ArGoSoft (2,899 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	783	27.01%
1.8 (1.8.8.8)	473	16.32%
1.8 (1.8.8.7)	346	11.94%
1.8 (1.8.8.9)	183	6.31%
1.8 (1.8.9.2)	113	3.90%
1.8 (1.8.9.0)	107	3.69%
1.8 (1.8.8.1)	73	2.52%
1.8 (1.8.6.0)	65	2.24%
1.8 (1.8.8.2)	63	2.17%
1.8 (1.8.8.3)	53	1.83%
1.8 (1.8.5.9)	42	1.45%
1.8 (1.8.7.5)	41	1.41%
1.8 (1.8.8.4)	38	1.31%
1.8 (1.8.8.9	34	1.17%
1.8 (1.8.8.5)	32	1.10%
Other	453	15.63%
XMail (2,536 servers)
Version	Number of Servers	Percent
1.22	869	34.27%
1.24	491	19.36%
1.21	384	15.14%
1.20	178	7.02%
1.17	168	6.62%
1.23	136	5.36%
1.12	87	3.43%
1.18	50	1.97%
1.16	42	1.66%
Other	131	5.17%
SurgeSMTP (1,832 servers)
Version	Number of Servers	Percent
3.8i3-3	345	18.83%
3.8k4-4	223	12.17%
3.7b8-8	206	11.24%
3.8f3-3	158	8.62%
3.8o-1	131	7.15%
3.8k2-2	115	6.28%
3.6f5-5	99	5.40%
3.8f2-2	87	4.75%
3.5b3-3	65	3.55%
3.0c2-2	54	2.95%
3.8i-1	45	2.46%
3.8m-1	44	2.40%
3.7b6-6	41	2.24%
3.8k-1	24	1.31%
2.0g2-1	20	1.09%
Other	175	9.55%
Qmail Toaster (1,488 servers)
Version	Number of Servers	Percent
1.3	978	65.73%
1.2	419	28.16%
1.0	91	6.12%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,295 servers)
Version	Number of Servers	Percent
Other	1,295	100.00%
Post.Office (1,080 servers)
Version	Number of Servers	Percent
3.5.3	304	28.15%
4.0.1	94	8.70%
3.5.3J	91	8.43%
3.8.3	67	6.20%
3.6.3	59	5.46%
3.6.2	42	3.89%
3.9.1	39	3.61%
3.1.2J	37	3.43%
3.1.2	29	2.69%
3.9.2.3	28	2.59%
3.9.2	28	2.59%
3.8.4	26	2.41%
3.9.0	26	2.41%
3.8.7.4	22	2.04%
3.5.2	21	1.94%
4.0.0.2	20	1.85%
3.6.0	18	1.67%
3.8.2	13	1.20%
3.9.1.3	13	1.20%
3.9.2.1	12	1.11%
4.0.0.1	12	1.11%
Other	79	7.31%
NetIQ MailMarshal (939 servers)
Version	Number of Servers	Percent
6.0.3.8	710	75.61%
5.5.6.7	56	5.96%
6.1.3.15	48	5.11%
5.5.4.16	22	2.34%
5.5.6.5	21	2.24%
5.5.6.6	21	2.24%
5.5.5.9	15	1.60%
5.5.5.6	13	1.38%
Other	33	3.51%
InterScan VirusWall (920 servers)
Version	Number of Servers	Percent
Other	920	100.00%
Interscan (780 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	162	20.77%
3.81-Build_1022	92	11.79%
3.8-Build_3013	82	10.51%
3.53 (build 2011)	67	8.59%
3.53 (build 2017)	62	7.95%
3.55 (build 1029)	57	7.31%
3.81-Build_1084	46	5.90%
3.53 (build 2013)	37	4.74%
3.55 (build 1020)	28	3.59%
3.53 (build 1493)	25	3.21%
3.52 (build 1375)	24	3.08%
3.8-Build_3065	11	1.41%
3.8-Build_1080	11	1.41%
3.81-Build_1055	8	1.03%
Other	68	8.72%
VisNetic (581 servers)
Version	Number of Servers	Percent
8.5.0.8	122	21.00%
7.2.4.1	45	7.75%
5.8.6.6	37	6.37%
8.3.5.0	34	5.85%
6.2.2.0	32	5.51%
8.0.3.1	31	5.34%
5.0.2.3	30	5.16%
7.6.1.0	30	5.16%
8.0.3.0	30	5.16%
5.5.8.3	26	4.48%
5.3.5.0	19	3.27%
8.3.6	17	2.93%
8.0.3	17	2.93%
8.5.0.5	14	2.41%
5.4.5.4	14	2.41%
8.9.2.0	10	1.72%
7.5.3.0	10	1.72%
5.0.1	8	1.38%
5.8.6.4	7	1.20%
8.3.0.1	6	1.03%
Other	42	7.23%
Mirapoint (554 servers)
Version	Number of Servers	Percent
3.8.3-GA	110	19.86%
3.8.4-GA	107	19.31%
3.7.5a-GA	71	12.82%
3.8.5-GA	55	9.93%
3.8.2-GA	55	9.93%
3.7.3a-GA	37	6.68%
3.7.4b-GA	31	5.60%
3.7.5-GA	17	3.07%
1.1.0	9	1.62%
3.5.8-GR	9	1.62%
3.7.2-GA	8	1.44%
3.7.1-GA	8	1.44%
3.7.3-GA	6	1.08%
Other	31	5.60%
ModusMail (439 servers)
Version	Number of Servers	Percent
4.35.480.0	251	57.18%
3.2.315.0	32	7.29%
4.1.361.21	29	6.61%
4.2.425.22	23	5.24%
4.35.477.0	22	5.01%
3.1.297.0	16	3.64%
3.0.273.0	12	2.73%
3.1.302.0	11	2.51%
4.35.480.11	10	2.28%
4.3.459.0	6	1.37%
Other	27	6.15%
MagicMail (303 servers)
Version	Number of Servers	Percent
Other	303	100.00%
WebSTAR V (252 servers)
Version	Number of Servers	Percent
5.4.0	76	30.16%
5.4.1	67	26.59%
5.3.4	57	22.62%
5.3.3	22	8.73%
5.3.2	19	7.54%
5.3.0	8	3.17%
Other	3	1.19%
Mercury (237 servers)
Version	Number of Servers	Percent
1.48	109	45.99%
3.32	78	32.91%
3.21c	20	8.44%
1.44	9	3.80%
3.31	8	3.38%
1.47	5	2.11%
Other	8	3.38%
Neon Mail Server (183 servers)
Version	Number of Servers	Percent
3.0.9	67	36.61%
3.0.7	54	29.51%
3.1.0	45	24.59%
3.0.6	8	4.37%
3.0.8	5	2.73%
3.0.4	2	1.09%
3.0.5	2	1.09%
Other	0	0.00%
MAILsweeper (152 servers)
Version	Number of Servers	Percent
4.3.20.0	31	20.39%
4.3.14.0	25	16.45%
4.3.17.0	24	15.79%
4.3.12.0	17	11.18%
4.3.19.0	17	11.18%
4.2.10.0	9	5.92%
4.3.6.0	7	4.61%
4.3.10.0	7	4.61%
4.2.5.0	5	3.29%
4.3.1.0	5	3.29%
4.2.1.0	3	1.97%
Other	2	1.32%
MessageWall (115 servers)
Version	Number of Servers	Percent
1.0.8	92	80.00%
1.0.11	17	14.78%
1.0.6	3	2.61%
1.1.0	3	2.61%
Other	0	0.00%
WebSTAR (111 servers)
Version	Number of Servers	Percent
Other	111	100.00%
OpenVMS (36 servers)
Version	Number of Servers	Percent
7.3	14	38.89%
8.2	10	27.78%
8.3	8	22.22%
7.2	3	8.33%
6.1	1	2.78%
Other	0	0.00%