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	1,782,613	100.0%
Number of Servers that didn't respond	276,913	15.53%
Server didn't open socket	265,594	14.90%
Server didn't provide banner	11,319	0.63%
Server provided banner	1,505,700	84.47%
Server banner identifies software in use	906,816	50.87%

As indicated by the above table, of the 1,782,613 servers queried, only 906,816 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	254,256	28.04%
Microsoft	199,967	22.05%
Exim	188,469	20.78%
Postfix	140,055	15.44%
IMail	27,722	3.06%
MDaemon	22,308	2.46%
MailEnable	21,837	2.41%
Lotus Domino	7,316	0.81%
Merak	7,081	0.78%
Kerio	5,126	0.57%
CommuniGate Pro	5,004	0.55%
WinWebMail	4,451	0.49%
Trend Micro	3,842	0.42%
GroupWise	3,275	0.36%
ArGoSoft	2,827	0.31%
XMail	2,611	0.29%
SurgeSMTP	1,839	0.20%
Qmail Toaster	1,560	0.17%
Gordano Messaging Suite (GMS)	1,147	0.13%
Post.Office	1,033	0.11%
InterScan VirusWall	850	0.09%
NetIQ MailMarshal	842	0.09%
Interscan	695	0.08%
VisNetic	562	0.06%
Mirapoint	559	0.06%
MagicMail	337	0.04%
ModusMail	250	0.03%
WebSTAR V	244	0.03%
Mercury	215	0.02%
Neon Mail Server	178	0.02%
MAILsweeper	125	0.01%
MessageWall	103	0.01%
WebSTAR	97	0.01%
OpenVMS	33	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (254,256 servers)
Version	Number of Servers	Percent
8.12.11.20060614	42,206	16.60%
8.12.11.20060308	32,107	12.63%
8.13.1	26,598	10.46%
8.13.6	24,252	9.54%
8.11.6	23,684	9.32%
8.12.10	16,421	6.46%
8.13.8	15,337	6.03%
8.13.6.20060614	10,375	4.08%
8.14.1	10,005	3.94%
8.12.11	9,951	3.91%
8.13.4	8,299	3.26%
8.12.8	7,104	2.79%
8.13.7	5,991	2.36%
8.9.3	4,168	1.64%
8.10.2	4,143	1.63%
Other	13,615	5.35%
Microsoft (199,967 servers)
Version	Number of Servers	Percent
6.0.3790.3959	102,282	51.15%
6.0.3790.1830	59,531	29.77%
5.0.2195.6713	22,953	11.48%
6.0.3790.211	9,499	4.75%
Other	5,702	2.85%
Exim (188,469 servers)
Version	Number of Servers	Percent
4.68	105,534	56.00%
4.63	38,175	20.26%
4.66	9,123	4.84%
4.50	7,863	4.17%
4.60	7,392	3.92%
4.67	4,341	2.30%
4.62	3,885	2.06%
4.52	2,760	1.46%
Other	9,396	4.99%
Postfix (140,055 servers)
Version	Number of Servers	Percent
Other	140,055	100.00%
IMail (27,722 servers)
Version	Number of Servers	Percent
8.22	5,531	19.95%
8.15	4,871	17.57%
8.05	2,595	9.36%
9.21	2,104	7.59%
9.10	1,772	6.39%
9.22	1,435	5.18%
9.20	1,196	4.31%
7.07	1,151	4.15%
7.15	1,103	3.98%
6.06	844	3.04%
8.00	609	2.20%
8.21	544	1.96%
8.20	382	1.38%
8.10	345	1.24%
8.04	317	1.14%
8.12	309	1.11%
Other	2,614	9.43%
MDaemon (22,308 servers)
Version	Number of Servers	Percent
9.6.2	4,945	22.17%
9.5.6	1,429	6.41%
9.6.3	1,397	6.26%
9.6.1	1,243	5.57%
8.1.3	1,185	5.31%
9.0.4	1,110	4.98%
6.8.5	697	3.12%
9.5.1	685	3.07%
9.5.2	677	3.03%
7.2.3	638	2.86%
7.2.0	513	2.30%
9.0.1	509	2.28%
9.5.5	436	1.95%
8.1.4	427	1.91%
9.5.4	421	1.89%
9.0.0	419	1.88%
8.0.2	399	1.79%
9.6.0	393	1.76%
8.1.1	345	1.55%
9.5.3	323	1.45%
7.1.2	292	1.31%
8.1.5	280	1.26%
8.0.3	279	1.25%
9.0.7	255	1.14%
7.1.0	251	1.13%
7.2.2	245	1.10%
7.2.1	226	1.01%
9.0.6	226	1.01%
Other	2,063	9.25%
MailEnable (21,837 servers)
Version	Number of Servers	Percent
1.981--	5,074	23.24%
1.96--	1,924	8.81%
1.95--	1,590	7.28%
1.983--	1,441	6.60%
1.9--	1,416	6.48%
1.8--	1,300	5.95%
0-2.37-	1,128	5.17%
0-1.85-	1,029	4.71%
0-2.38-	767	3.51%
0-2.36-	533	2.44%
0--2.37	482	2.21%
0--2.38	444	2.03%
0-1.841-	247	1.13%
Other	4,462	20.43%
Lotus Domino (7,316 servers)
Version	Number of Servers	Percent
7.0.2	944	12.90%
7.0.2FP2	562	7.68%
6.5.4	528	7.22%
7.0.1	490	6.70%
6.5.1	458	6.26%
6.5.3	394	5.39%
6.5.5	352	4.81%
7.0	316	4.32%
7.0.2FP1	312	4.26%
6.5	271	3.70%
8.0	233	3.18%
5.0.11	198	2.71%
6.5.2	191	2.61%
5.0.12	139	1.90%
6.5.5FP2	121	1.65%
5.0.8	112	1.53%
5.0.10	111	1.52%
7.0.1FP1	110	1.50%
5.0.13a	109	1.49%
6.5.4FP2	90	1.23%
6.5.6	88	1.20%
6.0.2CF1	87	1.19%
6.0.3	80	1.09%
6.5.4FP3	76	1.04%
Other	944	12.90%
Merak (7,081 servers)
Version	Number of Servers	Percent
8.0.3	2,027	28.63%
8.9.1	1,178	16.64%
8.5.0	574	8.11%
9.0.0	329	4.65%
7.4.5	317	4.48%
7.5.2	305	4.31%
8.3.8	300	4.24%
7.6.4	282	3.98%
7.4.2	167	2.36%
7.2.0	122	1.72%
8.2.4	117	1.65%
8.9.0	109	1.54%
6.2.1	92	1.30%
7.4.0	84	1.19%
8.3.0	79	1.12%
7.6.1	73	1.03%
Other	926	13.08%
Kerio (5,126 servers)
Version	Number of Servers	Percent
6.4.1	1,752	34.18%
6.3.1	933	18.20%
6.4.0	721	14.07%
6.3.0	304	5.93%
6.2.2	133	2.59%
6.1.3	118	2.30%
6.1.2	117	2.28%
6.2.0	116	2.26%
6.1.0	112	2.18%
6.1.4	98	1.91%
6.0.10	96	1.87%
6.0.3	76	1.48%
6.1.1	60	1.17%
Other	490	9.56%
CommuniGate Pro (5,004 servers)
Version	Number of Servers	Percent
4.1.8	569	11.37%
5.1.12	418	8.35%
4.2.10	350	6.99%
5.1.10	213	4.26%
5.1.11	208	4.16%
5.0.9	198	3.96%
5.0.13	188	3.76%
5.1.13	180	3.60%
5.1.9	159	3.18%
5.1.7	145	2.90%
5.1.8	141	2.82%
4.3.12	132	2.64%
4.2.8	110	2.20%
4.2.7	98	1.96%
5.0.8	88	1.76%
5.0.11	88	1.76%
4.2	86	1.72%
5.1.5	84	1.68%
4.2.9	82	1.64%
5.1.3	73	1.46%
4.0.6	71	1.42%
5.1.6	67	1.34%
5.1.2	59	1.18%
3.5.9	58	1.16%
4.3.8	57	1.14%
Other	1,082	21.62%
WinWebMail (4,451 servers)
Version	Number of Servers	Percent
3.7.3.1	1,681	37.77%
3.7.1.1	907	20.38%
3.6.3.1	574	12.90%
3.7.0.5	434	9.75%
3.7.0.7	291	6.54%
3.7.0.3	264	5.93%
3.7.5.1	250	5.62%
Other	50	1.12%
Trend Micro (3,842 servers)
Version	Number of Servers	Percent
5.7	1,733	45.11%
5.5	1,545	40.21%
5.18	447	11.63%
7.0	59	1.54%
Other	58	1.51%
GroupWise (3,275 servers)
Version	Number of Servers	Percent
7.0.2	978	29.86%
7.0.1	518	15.82%
6.5.7	388	11.85%
6.5.4	270	8.24%
6.5.6	198	6.05%
6.0.4	180	5.50%
7.0	136	4.15%
6.5.5	136	4.15%
6.5.1	111	3.39%
6.0.2	53	1.62%
6.5.3	52	1.59%
6.5.2	50	1.53%
6.0.3	48	1.47%
5.5.5	37	1.13%
Other	120	3.66%
ArGoSoft (2,827 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	599	21.19%
1.8 (1.8.8.8)	412	14.57%
1.8 (1.8.9.2)	319	11.28%
1.8 (1.8.8.7)	313	11.07%
1.8 (1.8.8.9)	153	5.41%
1.8 (1.8.9.3)	132	4.67%
1.8 (1.8.9.0)	91	3.22%
1.8 (1.8.8.1)	67	2.37%
1.8 (1.8.8.2)	61	2.16%
1.8 (1.8.6.0)	57	2.02%
1.8 (1.8.8.3)	45	1.59%
1.8 (1.8.5.9)	37	1.31%
1.8 (1.8.7.5)	36	1.27%
1.8 (1.8.8.4)	34	1.20%
Other	471	16.66%
XMail (2,611 servers)
Version	Number of Servers	Percent
1.22	899	34.43%
1.24	607	23.25%
1.21	362	13.86%
1.20	153	5.86%
1.17	149	5.71%
1.23	140	5.36%
1.12	86	3.29%
1.18	44	1.69%
1.16	41	1.57%
Other	130	4.98%
SurgeSMTP (1,839 servers)
Version	Number of Servers	Percent
3.8k4-4	506	27.51%
3.8i3-3	206	11.20%
3.7b8-8	190	10.33%
3.8o-1	138	7.50%
3.8f3-3	115	6.25%
3.6f5-5	94	5.11%
3.8f2-2	85	4.62%
3.5b3-3	63	3.43%
3.8k2-2	61	3.32%
3.0c2-2	55	2.99%
3.7b6-6	41	2.23%
3.8m-1	32	1.74%
3.8i-1	27	1.47%
3.8k-1	23	1.25%
2.1c7-7	21	1.14%
2.0g2-1	19	1.03%
Other	163	8.86%
Qmail Toaster (1,560 servers)
Version	Number of Servers	Percent
1.3	1,081	69.29%
1.2	397	25.45%
1.0	82	5.26%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,147 servers)
Version	Number of Servers	Percent
Other	1,147	100.00%
Post.Office (1,033 servers)
Version	Number of Servers	Percent
3.5.3	288	27.88%
4.0.1	94	9.10%
3.5.3J	82	7.94%
3.8.3	60	5.81%
3.6.3	53	5.13%
3.6.2	42	4.07%
3.9.1	36	3.48%
3.1.2J	34	3.29%
3.9.2.3	31	3.00%
3.9.2	27	2.61%
3.1.2	26	2.52%
3.9.0	26	2.52%
3.8.7.4	25	2.42%
3.8.4	23	2.23%
3.5.2	21	2.03%
4.0.0.2	17	1.65%
3.6.0	16	1.55%
3.8.2	14	1.36%
3.9.1.3	14	1.36%
3.9.2.1	13	1.26%
4.0.0.1	13	1.26%
Other	78	7.55%
InterScan VirusWall (850 servers)
Version	Number of Servers	Percent
Other	850	100.00%
NetIQ MailMarshal (842 servers)
Version	Number of Servers	Percent
6.0.3.8	637	75.65%
5.5.6.7	49	5.82%
6.1.3.15	40	4.75%
5.5.6.6	20	2.38%
5.5.6.5	20	2.38%
5.5.4.16	19	2.26%
5.5.5.9	15	1.78%
5.5.5.6	11	1.31%
5.5.4.17	9	1.07%
Other	22	2.61%
Interscan (695 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	138	19.86%
3.81-Build_1022	84	12.09%
3.8-Build_3013	75	10.79%
3.53 (build 2017)	59	8.49%
3.55 (build 1029)	56	8.06%
3.53 (build 2011)	55	7.91%
3.81-Build_1084	46	6.62%
3.53 (build 2013)	27	3.88%
3.53 (build 1493)	25	3.60%
3.52 (build 1375)	23	3.31%
3.55 (build 1020)	19	2.73%
3.8-Build_1080	12	1.73%
3.81-Build_1055	8	1.15%
3.81-Build_1021	8	1.15%
3.8-Build_3065	7	1.01%
Other	53	7.63%
VisNetic (562 servers)
Version	Number of Servers	Percent
8.5.0.8	124	22.06%
7.2.4.1	42	7.47%
5.8.6.6	35	6.23%
8.0.3.1	33	5.87%
8.0.3.0	33	5.87%
8.3.5.0	32	5.69%
6.2.2.0	31	5.52%
5.0.2.3	29	5.16%
5.5.8.3	25	4.45%
7.6.1.0	24	4.27%
8.3.6	17	3.02%
5.3.5.0	17	3.02%
8.5.0.5	13	2.31%
8.9.2.0	13	2.31%
8.0.3	13	2.31%
5.4.5.4	11	1.96%
7.5.3.0	11	1.96%
8.3.0.1	7	1.25%
5.8.6.4	6	1.07%
7.2.4.0	6	1.07%
Other	40	7.12%
Mirapoint (559 servers)
Version	Number of Servers	Percent
3.8.3-GA	105	18.78%
3.8.4-GA	103	18.43%
3.8.5-GA	92	16.46%
3.7.5a-GA	65	11.63%
3.8.2-GA	52	9.30%
3.7.4b-GA	28	5.01%
3.7.3a-GA	28	5.01%
3.7.5-GA	14	2.50%
3.5.8-GR	9	1.61%
1.1.0	9	1.61%
3.7.1-GA	8	1.43%
3.7.2-GA	6	1.07%
3.7.3-GA	6	1.07%
Other	34	6.08%
MagicMail (337 servers)
Version	Number of Servers	Percent
Other	337	100.00%
ModusMail (250 servers)
Version	Number of Servers	Percent
4.35.480.0	85	34.00%
3.2.315.0	31	12.40%
4.2.425.22	26	10.40%
4.1.361.21	26	10.40%
4.35.477.0	21	8.40%
3.0.273.0	11	4.40%
3.1.302.0	9	3.60%
4.3.459.0	8	3.20%
4.35.480.11	7	2.80%
4.2.420.0	4	1.60%
4.1.361.0	3	1.20%
4.2.425.4	3	1.20%
4.0.340.0	3	1.20%
Other	13	5.20%
WebSTAR V (244 servers)
Version	Number of Servers	Percent
5.4.0	77	31.56%
5.4.1	61	25.00%
5.3.4	55	22.54%
5.3.3	22	9.02%
5.3.2	19	7.79%
5.3.0	7	2.87%
Other	3	1.23%
Mercury (215 servers)
Version	Number of Servers	Percent
1.48	100	46.51%
3.32	68	31.63%
3.21c	18	8.37%
3.31	8	3.72%
1.44	7	3.26%
1.47	6	2.79%
Other	8	3.72%
Neon Mail Server (178 servers)
Version	Number of Servers	Percent
3.0.9	52	29.21%
3.0.7	51	28.65%
3.1.0	31	17.42%
3.1.2	25	14.04%
3.0.6	8	4.49%
3.0.8	6	3.37%
3.0.4	2	1.12%
3.0.5	2	1.12%
Other	1	0.56%
MAILsweeper (125 servers)
Version	Number of Servers	Percent
4.3.20.0	26	20.80%
4.3.17.0	20	16.00%
4.3.14.0	19	15.20%
4.3.19.0	18	14.40%
4.3.12.0	13	10.40%
4.2.10.0	8	6.40%
4.3.6.0	6	4.80%
4.3.10.0	6	4.80%
4.3.1.0	4	3.20%
4.2.5.0	3	2.40%
Other	2	1.60%
MessageWall (103 servers)
Version	Number of Servers	Percent
1.0.8	83	80.58%
1.0.11	15	14.56%
1.0.6	3	2.91%
1.1.0	2	1.94%
Other	0	0.00%
WebSTAR (97 servers)
Version	Number of Servers	Percent
Other	97	100.00%
OpenVMS (33 servers)
Version	Number of Servers	Percent
7.3	11	33.33%
8.2	10	30.30%
8.3	9	27.27%
7.2	2	6.06%
6.1	1	3.03%
Other	0	0.00%