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	1,680,006	100.0%
Number of Servers that didn't respond	238,538	14.20%
Server didn't open socket	230,161	13.70%
Server didn't provide banner	8,377	0.50%
Server provided banner	1,441,468	85.80%
Server banner identifies software in use	906,100	53.93%

As indicated by the above table, of the 1,680,006 servers queried, only 906,100 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	293,115	32.35%
Microsoft	190,727	21.05%
Exim	164,748	18.18%
Postfix	118,897	13.12%
IMail	38,447	4.24%
MDaemon	21,450	2.37%
MailEnable	19,158	2.11%
Merak	8,570	0.95%
Lotus Domino	8,562	0.94%
CommuniGate Pro	5,529	0.61%
Trend Micro	4,842	0.53%
GroupWise	4,483	0.49%
WinWebMail	4,124	0.46%
Kerio	4,074	0.45%
ArGoSoft	3,146	0.35%
XMail	2,417	0.27%
SurgeSMTP	1,710	0.19%
Gordano Messaging Suite (GMS)	1,679	0.19%
NetIQ MailMarshal	1,552	0.17%
Post.Office	1,304	0.14%
Interscan	1,289	0.14%
InterScan VirusWall	1,276	0.14%
Qmail Toaster	1,117	0.12%
ModusMail	889	0.10%
VisNetic	722	0.08%
Mirapoint	519	0.06%
Mercury	359	0.04%
WebSTAR V	337	0.04%
MAILsweeper	335	0.04%
MagicMail	202	0.02%
WebSTAR	162	0.02%
Neon Mail Server	162	0.02%
MessageWall	161	0.02%
OpenVMS	36	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (293,115 servers)
Version	Number of Servers	Percent
8.12.11.20060614	50,896	17.36%
8.11.6	42,242	14.41%
8.12.11.20060308	30,797	10.51%
8.13.6	28,465	9.71%
8.12.10	23,587	8.05%
8.13.1	20,805	7.10%
8.12.11	14,251	4.86%
8.13.4	11,331	3.87%
8.12.8	10,911	3.72%
8.13.8	10,746	3.67%
8.13.6.20060614	9,316	3.18%
8.10.2	7,378	2.52%
8.9.3	6,912	2.36%
8.13.7	6,512	2.22%
8.13.3	3,244	1.11%
Other	15,722	5.36%
Microsoft (190,727 servers)
Version	Number of Servers	Percent
6.0.3790.1830	123,403	64.70%
5.0.2195.6713	37,253	19.53%
6.0.3790.211	19,254	10.10%
6.0.3790.0	2,923	1.53%
5.5.2653.13	2,916	1.53%
Other	4,978	2.61%
Exim (164,748 servers)
Version	Number of Servers	Percent
4.52	119,447	72.50%
4.50	10,828	6.57%
4.60	7,282	4.42%
4.63	7,243	4.40%
4.62	4,023	2.44%
4.44	2,958	1.80%
3.36	1,869	1.13%
Other	11,098	6.74%
Postfix (118,897 servers)
Version	Number of Servers	Percent
Other	118,897	100.00%
IMail (38,447 servers)
Version	Number of Servers	Percent
8.15	8,649	22.50%
8.22	6,004	15.62%
8.05	4,817	12.53%
9.10	3,888	10.11%
6.06	2,047	5.32%
7.15	1,700	4.42%
8.21	1,681	4.37%
7.07	1,561	4.06%
9.04	899	2.34%
8.20	742	1.93%
8.00	676	1.76%
8.10	576	1.50%
8.12	480	1.25%
8.14	462	1.20%
8.02	431	1.12%
8.13	391	1.02%
Other	3,443	8.96%
MDaemon (21,450 servers)
Version	Number of Servers	Percent
9.5.3	3,678	17.15%
8.1.3	1,771	8.26%
9.0.4	1,377	6.42%
6.8.5	1,123	5.24%
7.2.3	880	4.10%
9.0.6	815	3.80%
7.2.0	790	3.68%
8.1.4	756	3.52%
9.0.1	753	3.51%
9.5.2	660	3.08%
9.0.7	647	3.02%
9.0.0	636	2.97%
8.0.2	577	2.69%
9.5.1	573	2.67%
8.1.1	491	2.29%
8.0.3	467	2.18%
8.1.5	454	2.12%
9.0.5	447	2.08%
7.1.2	415	1.93%
7.2.2	368	1.72%
7.1.0	359	1.67%
6.8.4	339	1.58%
7.2.1	325	1.52%
8.0.1	324	1.51%
7.0.1	304	1.42%
Other	2,121	9.89%
MailEnable (19,158 servers)
Version	Number of Servers	Percent
1.96--	2,618	13.67%
1.8--	2,435	12.71%
1.9--	2,389	12.47%
1.95--	1,855	9.68%
0-1.75-	720	3.76%
0-1.54-	625	3.26%
0-1.6-	581	3.03%
0-2.32-	571	2.98%
0-1.79-	477	2.49%
1.73--	372	1.94%
0-2.11-	340	1.77%
0-2.2-	307	1.60%
0--2.32	284	1.48%
0-1.71-	251	1.31%
1.91--	251	1.31%
1.71--	232	1.21%
0-1.82-	222	1.16%
0-1.72-	218	1.14%
0--2.2	218	1.14%
0-2.35-	210	1.10%
1.92--	205	1.07%
Other	3,777	19.72%
Merak (8,570 servers)
Version	Number of Servers	Percent
8.5.0	1,956	22.82%
8.0.3	1,862	21.73%
8.3.8	597	6.97%
8.9.0	576	6.72%
7.4.5	446	5.20%
7.6.4	356	4.15%
7.5.2	347	4.05%
8.2.4	220	2.57%
7.4.2	216	2.52%
7.2.0	192	2.24%
6.2.1	145	1.69%
8.3.0	123	1.44%
7.4.0	107	1.25%
7.6.1	99	1.16%
Other	1,328	15.50%
Lotus Domino (8,562 servers)
Version	Number of Servers	Percent
6.5.4	830	9.69%
6.5.1	777	9.07%
7.0.1	769	8.98%
6.5.3	595	6.95%
6.5.5	510	5.96%
7.0.2	497	5.80%
7.0	495	5.78%
6.5	393	4.59%
5.0.11	351	4.10%
6.5.2	339	3.96%
5.0.12	246	2.87%
7.0.1FP1	237	2.77%
5.0.8	207	2.42%
5.0.10	179	2.09%
5.0.13a	171	2.00%
6.5.4FP2	168	1.96%
6.0.2CF1	147	1.72%
6.0.3	137	1.60%
6.5.5FP1	128	1.49%
6.5.4FP1	125	1.46%
6.5.4FP3	122	1.42%
6.0	122	1.42%
5.0.9	93	1.09%
5.0.5	91	1.06%
6.0.1	88	1.03%
6.5.3FP1	86	1.00%
Other	659	7.70%
CommuniGate Pro (5,529 servers)
Version	Number of Servers	Percent
4.1.8	815	14.74%
4.2.10	569	10.29%
5.0.9	447	8.08%
5.0.8	183	3.31%
5.1.1	182	3.29%
4.2.4	171	3.09%
5.1.2	166	3.00%
5.0.11	164	2.97%
4.2.8	162	2.93%
4.2	151	2.73%
5.1.3	146	2.64%
4.3.8	126	2.28%
4.2.7	126	2.28%
4.0.6	126	2.28%
4.2.9	126	2.28%
4.3.6	117	2.12%
5.0.10	101	1.83%
4.0.1	96	1.74%
5.1	95	1.72%
3.5.9	94	1.70%
5.0.6	85	1.54%
5.0.12	71	1.28%
4.3.4	57	1.03%
5.0.1	56	1.01%
Other	1,097	19.84%
Trend Micro (4,842 servers)
Version	Number of Servers	Percent
5.5	2,732	56.42%
5.7	1,550	32.01%
5.18	487	10.06%
5.15	51	1.05%
Other	22	0.45%
GroupWise (4,483 servers)
Version	Number of Servers	Percent
7.0.1	1,133	25.27%
6.5.4	661	14.74%
7.0	346	7.72%
6.0.4	331	7.38%
6.5.5	323	7.20%
6.5.6	297	6.63%
6.5.1	257	5.73%
6.5.7	250	5.58%
6.5.2	150	3.35%
6.5.3	148	3.30%
6.0.2	115	2.57%
6.0.3	107	2.39%
5.5.5	91	2.03%
6.5.0	84	1.87%
6.0.1	73	1.63%
Other	117	2.61%
WinWebMail (4,124 servers)
Version	Number of Servers	Percent
3.7.1.1	1,308	31.72%
3.6.3.1	957	23.21%
3.7.0.5	593	14.38%
3.7.0.7	508	12.32%
3.7.0.3	402	9.75%
3.7.3.1	302	7.32%
Other	54	1.31%
Kerio (4,074 servers)
Version	Number of Servers	Percent
6.3.0	963	23.64%
6.2.2	541	13.28%
6.2.0	316	7.76%
6.1.3	268	6.58%
6.1.2	254	6.23%
6.1.4	249	6.11%
6.1.0	203	4.98%
6.0.10	158	3.88%
6.1.1	128	3.14%
6.2.1	119	2.92%
6.0.3	106	2.60%
6.0.8	77	1.89%
5.7.10	65	1.60%
6.0.9	60	1.47%
6.2.3	58	1.42%
6.0.6	55	1.35%
6.0.7	51	1.25%
Other	403	9.89%
ArGoSoft (3,146 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	947	30.10%
1.8 (1.8.8.7)	703	22.35%
1.8 (1.8.8.1)	130	4.13%
1.8 (1.8.6.0)	108	3.43%
1.8 (1.8.8.2)	85	2.70%
1.8 (1.8.8.3)	81	2.57%
1.8 (1.8.8.9	80	2.54%
1.8 (1.8.8.5)	77	2.45%
1.8 (1.8.8.4)	71	2.26%
1.8 (1.8.7.5)	62	1.97%
1.8 (1.8.5.9)	57	1.81%
1.8 (1.8.6.6)	47	1.49%
1.8 (1.8.8.6)	45	1.43%
1.8 (1.8.7.6)	41	1.30%
1.8 (1.8.7.3)	35	1.11%
Other	577	18.34%
XMail (2,417 servers)
Version	Number of Servers	Percent
1.22	1,037	42.90%
1.21	501	20.73%
1.20	239	9.89%
1.17	201	8.32%
1.23	90	3.72%
1.12	75	3.10%
1.18	72	2.98%
1.16	43	1.78%
1.10	36	1.49%
1.15	30	1.24%
1.11	26	1.08%
Other	67	2.77%
SurgeSMTP (1,710 servers)
Version	Number of Servers	Percent
3.7b8-8	538	31.46%
3.8f2-2	288	16.84%
3.6f5-5	178	10.41%
3.5b3-3	93	5.44%
3.8b-1	91	5.32%
3.0c2-2	88	5.15%
3.7b6-6	62	3.63%
3.8g-7	57	3.33%
2.1c7-7	31	1.81%
2.0g2-1	25	1.46%
3.6f3-3	25	1.46%
1.8g3	20	1.17%
1.6e2	18	1.05%
Other	196	11.46%
Gordano Messaging Suite (GMS) (1,679 servers)
Version	Number of Servers	Percent
Other	1,679	100.00%
NetIQ MailMarshal (1,552 servers)
Version	Number of Servers	Percent
6.0.3.8	1,092	70.36%
5.5.6.7	149	9.60%
6.1.3.15	76	4.90%
5.5.4.16	46	2.96%
5.5.5.9	41	2.64%
5.5.6.6	32	2.06%
5.5.6.5	31	2.00%
5.5.5.6	21	1.35%
5.5.4.17	17	1.10%
Other	47	3.03%
Post.Office (1,304 servers)
Version	Number of Servers	Percent
3.5.3	449	34.43%
3.5.3J	135	10.35%
3.8.3	79	6.06%
3.6.3	68	5.21%
3.6.2	52	3.99%
3.1.2J	47	3.60%
3.1.2	41	3.14%
3.9.1	41	3.14%
4.0.1	40	3.07%
3.8.4	33	2.53%
3.9.2	28	2.15%
3.5.2	28	2.15%
3.9.0	27	2.07%
3.6.0	25	1.92%
3.8.7.4	21	1.61%
4.0.0.2	20	1.53%
4.0.0.1	16	1.23%
3.9.1.3	14	1.07%
3.9.2.3	14	1.07%
Other	126	9.66%
Interscan (1,289 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	309	23.97%
3.81-Build_1022	149	11.56%
3.8-Build_3013	121	9.39%
3.55 (build 1029)	118	9.15%
3.53 (build 2011)	113	8.77%
3.53 (build 2017)	102	7.91%
3.53 (build 2013)	69	5.35%
3.55 (build 1020)	50	3.88%
3.52 (build 1375)	43	3.34%
3.53 (build 1493)	34	2.64%
3.8-Build_1080	23	1.78%
3.81-Build_1084	18	1.40%
3.8-Build_3065	13	1.01%
Other	127	9.85%
InterScan VirusWall (1,276 servers)
Version	Number of Servers	Percent
Other	1,276	100.00%
Qmail Toaster (1,117 servers)
Version	Number of Servers	Percent
1.2	571	51.12%
1.3	416	37.24%
1.0	129	11.55%
Other	1	0.09%
ModusMail (889 servers)
Version	Number of Servers	Percent
4.35.480.0	609	68.50%
3.2.315.0	33	3.71%
4.1.361.21	29	3.26%
4.2.425.22	27	3.04%
3.1.302.0	26	2.92%
4.2.425.16	24	2.70%
4.35.477.0	24	2.70%
3.1.297.0	19	2.14%
4.3.459.0	16	1.80%
4.35.480.11	15	1.69%
4.1.361.0	12	1.35%
4.2.425.4	10	1.12%
Other	45	5.06%
VisNetic (722 servers)
Version	Number of Servers	Percent
8.5.0.8	92	12.74%
7.2.4.1	63	8.73%
8.0.3.0	54	7.48%
8.3.5.0	53	7.34%
5.8.6.6	48	6.65%
5.0.2.3	45	6.23%
6.2.2.0	42	5.82%
7.6.1.0	40	5.54%
5.5.8.3	35	4.85%
8.5.0.5	34	4.71%
8.0.3.1	34	4.71%
8.3.6	29	4.02%
7.5.3.0	22	3.05%
8.0.3	18	2.49%
5.4.5.4	18	2.49%
5.3.5.0	16	2.22%
8.3.0.1	13	1.80%
5.8.6.4	10	1.39%
7.2.4.0	8	1.11%
Other	48	6.65%
Mirapoint (519 servers)
Version	Number of Servers	Percent
3.7.5a-GA	97	18.69%
3.8.2-GA	85	16.38%
3.7.3a-GA	62	11.95%
3.7.4b-GA	48	9.25%
3.7.5-GA	36	6.94%
3.7.2-GA	25	4.82%
3.7.1-GA	23	4.43%
3.5.8-GR	20	3.85%
1.1.0	12	2.31%
3.8.1-FCS	12	2.31%
3.7.0-GA	10	1.93%
3.8.0-FCS	10	1.93%
3.7.3-GA	9	1.73%
3.5.9-GR	8	1.54%
3.6.6-GR	7	1.35%
3.6.5-GR	7	1.35%
3.6.4-CR	6	1.16%
Other	42	8.09%
Mercury (359 servers)
Version	Number of Servers	Percent
1.48	154	42.90%
3.32	125	34.82%
3.21c	30	8.36%
3.31	19	5.29%
1.44	13	3.62%
1.47	8	2.23%
3.01a	5	1.39%
Other	5	1.39%
WebSTAR V (337 servers)
Version	Number of Servers	Percent
5.4.1	97	28.78%
5.4.0	96	28.49%
5.3.4	76	22.55%
5.3.3	30	8.90%
5.3.2	20	5.93%
5.3.0	10	2.97%
5.3.1	5	1.48%
Other	3	0.89%
MAILsweeper (335 servers)
Version	Number of Servers	Percent
4.3.17.0	55	16.42%
4.3.12.0	55	16.42%
4.3.19.0	51	15.22%
4.3.14.0	49	14.63%
4.3.20.0	43	12.84%
4.3.1.0	18	5.37%
4.2.10.0	18	5.37%
4.2.1.0	11	3.28%
4.2.5.0	11	3.28%
4.3.10.0	11	3.28%
4.3.6.0	9	2.69%
Other	4	1.19%
MagicMail (202 servers)
Version	Number of Servers	Percent
Other	202	100.00%
WebSTAR (162 servers)
Version	Number of Servers	Percent
Other	162	100.00%
Neon Mail Server (162 servers)
Version	Number of Servers	Percent
3.0.7	70	43.21%
3.0.9	69	42.59%
3.0.8	10	6.17%
3.0.6	9	5.56%
3.0.4	2	1.23%
Other	2	1.23%
MessageWall (161 servers)
Version	Number of Servers	Percent
1.0.8	128	79.50%
1.0.11	17	10.56%
1.1.23	7	4.35%
1.0.6	4	2.48%
1.1.0	3	1.86%
Other	2	1.24%
OpenVMS (36 servers)
Version	Number of Servers	Percent
7.3	12	33.33%
8.2	11	30.56%
7.2	8	22.22%
8.3	3	8.33%
6.1	2	5.56%
Other	0	0.00%