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	1,719,247	100.0%
Number of Servers that didn't respond	253,984	14.77%
Server didn't open socket	244,983	14.25%
Server didn't provide banner	9,001	0.52%
Server provided banner	1,465,263	85.23%
Server banner identifies software in use	906,308	52.72%

As indicated by the above table, of the 1,719,247 servers queried, only 906,308 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	278,392	30.72%
Microsoft	195,050	21.52%
Exim	173,345	19.13%
Postfix	127,149	14.03%
IMail	33,188	3.66%
MDaemon	21,793	2.40%
MailEnable	20,238	2.23%
Merak	8,675	0.96%
Lotus Domino	7,900	0.87%
CommuniGate Pro	5,147	0.57%
Trend Micro	4,819	0.53%
Kerio	4,465	0.49%
WinWebMail	4,273	0.47%
GroupWise	3,886	0.43%
ArGoSoft	3,096	0.34%
XMail	2,537	0.28%
SurgeSMTP	1,714	0.19%
Gordano Messaging Suite (GMS)	1,485	0.16%
Qmail Toaster	1,302	0.14%
NetIQ MailMarshal	1,222	0.13%
Post.Office	1,213	0.13%
InterScan VirusWall	1,161	0.13%
Interscan	988	0.11%
VisNetic	656	0.07%
Mirapoint	555	0.06%
ModusMail	498	0.05%
Mercury	305	0.03%
WebSTAR V	301	0.03%
MagicMail	273	0.03%
MAILsweeper	223	0.02%
Neon Mail Server	170	0.02%
MessageWall	130	0.01%
WebSTAR	122	0.01%
OpenVMS	37	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (278,392 servers)
Version	Number of Servers	Percent
8.12.11.20060614	47,926	17.22%
8.12.11.20060308	33,469	12.02%
8.11.6	30,376	10.91%
8.13.6	27,968	10.05%
8.13.1	25,079	9.01%
8.12.10	20,779	7.46%
8.13.8	14,707	5.28%
8.12.11	12,552	4.51%
8.13.4	10,228	3.67%
8.13.6.20060614	9,871	3.55%
8.12.8	9,233	3.32%
8.13.7	6,152	2.21%
8.10.2	6,045	2.17%
8.9.3	5,850	2.10%
8.13.3	2,898	1.04%
Other	15,259	5.48%
Microsoft (195,050 servers)
Version	Number of Servers	Percent
6.0.3790.1830	121,421	62.25%
5.0.2195.6713	31,265	16.03%
6.0.3790.3959	18,633	9.55%
6.0.3790.211	15,262	7.82%
6.0.3790.0	2,209	1.13%
5.5.2653.13	2,110	1.08%
Other	4,150	2.13%
Exim (173,345 servers)
Version	Number of Servers	Percent
4.63	119,398	68.88%
4.52	12,150	7.01%
4.50	10,609	6.12%
4.60	7,738	4.46%
4.66	4,880	2.82%
4.62	4,101	2.37%
4.44	2,832	1.63%
Other	11,637	6.71%
Postfix (127,149 servers)
Version	Number of Servers	Percent
Other	127,149	100.00%
IMail (33,188 servers)
Version	Number of Servers	Percent
8.15	6,496	19.57%
8.22	5,849	17.62%
8.05	4,245	12.79%
9.10	3,358	10.12%
9.20	1,728	5.21%
7.07	1,392	4.19%
7.15	1,361	4.10%
8.21	1,245	3.75%
6.06	1,145	3.45%
8.00	649	1.96%
9.04	588	1.77%
8.20	527	1.59%
8.10	416	1.25%
8.02	412	1.24%
8.12	368	1.11%
8.13	348	1.05%
8.01	346	1.04%
Other	2,715	8.18%
MDaemon (21,793 servers)
Version	Number of Servers	Percent
9.5.6	4,530	20.79%
8.1.3	1,483	6.80%
9.0.4	1,230	5.64%
9.5.4	1,008	4.63%
9.5.5	965	4.43%
6.8.5	940	4.31%
7.2.3	771	3.54%
9.5.1	665	3.05%
7.2.0	658	3.02%
9.0.1	642	2.95%
9.5.3	636	2.92%
9.5.2	580	2.66%
8.1.4	574	2.63%
9.0.0	527	2.42%
8.0.2	518	2.38%
9.0.6	477	2.19%
8.0.3	431	1.98%
8.1.1	415	1.90%
9.0.7	402	1.84%
7.1.2	362	1.66%
8.1.5	360	1.65%
7.1.0	321	1.47%
7.2.2	310	1.42%
7.2.1	277	1.27%
8.0.1	269	1.23%
6.8.4	265	1.22%
7.0.1	256	1.17%
9.0.5	233	1.07%
Other	1,688	7.75%
MailEnable (20,238 servers)
Version	Number of Servers	Percent
1.981--	3,354	16.57%
1.96--	2,039	10.08%
1.8--	1,842	9.10%
1.95--	1,693	8.37%
1.9--	1,689	8.35%
0-2.37-	1,417	7.00%
0-1.85-	1,053	5.20%
0-2.36-	894	4.42%
0--2.37	793	3.92%
0-1.841-	420	2.08%
0-1.6-	389	1.92%
0--2.36	327	1.62%
0-1.75-	279	1.38%
0-1.54-	266	1.31%
1.73--	243	1.20%
0-2.32-	239	1.18%
Other	3,301	16.31%
Merak (8,675 servers)
Version	Number of Servers	Percent
8.0.3	2,021	23.30%
8.9.1	2,000	23.05%
8.5.0	918	10.58%
8.3.8	410	4.73%
7.4.5	342	3.94%
7.5.2	333	3.84%
7.6.4	303	3.49%
8.9.0	206	2.37%
7.4.2	206	2.37%
8.2.4	165	1.90%
7.2.0	163	1.88%
6.2.1	116	1.34%
8.3.0	107	1.23%
7.4.0	99	1.14%
7.6.1	88	1.01%
Other	1,198	13.81%
Lotus Domino (7,900 servers)
Version	Number of Servers	Percent
7.0.2	846	10.71%
6.5.4	696	8.81%
7.0.1	640	8.10%
6.5.1	624	7.90%
6.5.3	500	6.33%
6.5.5	450	5.70%
7.0	391	4.95%
7.0.2FP1	384	4.86%
6.5	355	4.49%
5.0.11	266	3.37%
6.5.2	256	3.24%
6.5.5FP2	192	2.43%
5.0.12	192	2.43%
7.0.1FP1	168	2.13%
5.0.10	151	1.91%
5.0.8	150	1.90%
5.0.13a	142	1.80%
6.5.4FP2	123	1.56%
6.0.2CF1	113	1.43%
6.5.4FP3	107	1.35%
6.0	100	1.27%
6.0.3	98	1.24%
6.5.5FP1	89	1.13%
6.5.4FP1	88	1.11%
5.0.9	83	1.05%
Other	696	8.81%
CommuniGate Pro (5,147 servers)
Version	Number of Servers	Percent
4.1.8	690	13.41%
4.2.10	506	9.83%
5.1.7	314	6.10%
5.0.9	314	6.10%
5.0.13	170	3.30%
5.1.8	146	2.84%
5.1.5	141	2.74%
5.0.8	130	2.53%
4.2.8	125	2.43%
5.0.11	122	2.37%
4.2	119	2.31%
5.1.3	119	2.31%
4.2.7	117	2.27%
5.1.6	113	2.20%
4.2.9	111	2.16%
4.0.6	99	1.92%
4.3.8	98	1.90%
4.3.12	95	1.85%
4.0.1	94	1.83%
5.1.4	90	1.75%
5.1.2	78	1.52%
3.5.9	76	1.48%
5.0.10	63	1.22%
5.0.6	61	1.19%
5.1.1	59	1.15%
4.3.6	56	1.09%
4.2.4	56	1.09%
Other	985	19.14%
Trend Micro (4,819 servers)
Version	Number of Servers	Percent
5.5	2,331	48.37%
5.7	1,927	39.99%
5.18	494	10.25%
Other	67	1.39%
Kerio (4,465 servers)
Version	Number of Servers	Percent
6.3.1	1,754	39.28%
6.3.0	553	12.39%
6.2.2	254	5.69%
6.1.3	186	4.17%
6.1.2	184	4.12%
6.1.0	183	4.10%
6.2.0	166	3.72%
6.1.4	159	3.56%
6.0.10	139	3.11%
6.0.3	90	2.02%
6.1.1	87	1.95%
6.2.1	68	1.52%
6.0.8	59	1.32%
5.7.10	54	1.21%
6.0.9	53	1.19%
6.0.6	45	1.01%
Other	431	9.65%
WinWebMail (4,273 servers)
Version	Number of Servers	Percent
3.7.1.1	1,101	25.77%
3.7.3.1	1,052	24.62%
3.6.3.1	816	19.10%
3.7.0.5	516	12.08%
3.7.0.7	400	9.36%
3.7.0.3	337	7.89%
Other	51	1.19%
GroupWise (3,886 servers)
Version	Number of Servers	Percent
7.0.1	1,276	32.84%
6.5.4	421	10.83%
6.5.7	405	10.42%
6.0.4	268	6.90%
6.5.6	237	6.10%
7.0	210	5.40%
6.5.5	194	4.99%
6.5.1	178	4.58%
7.0.2	96	2.47%
6.5.3	91	2.34%
6.5.2	88	2.26%
6.0.2	85	2.19%
6.0.3	78	2.01%
5.5.5	70	1.80%
6.0.1	55	1.42%
6.5.0	51	1.31%
Other	83	2.14%
ArGoSoft (3,096 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	827	26.71%
1.8 (1.8.8.7)	490	15.83%
1.8 (1.8.8.9)	400	12.92%
1.8 (1.8.9.0)	202	6.52%
1.8 (1.8.8.1)	97	3.13%
1.8 (1.8.6.0)	85	2.75%
1.8 (1.8.8.3)	69	2.23%
1.8 (1.8.8.2)	67	2.16%
1.8 (1.8.8.5)	64	2.07%
1.8 (1.8.8.9	55	1.78%
1.8 (1.8.8.4)	50	1.61%
1.8 (1.8.7.5)	45	1.45%
1.8 (1.8.5.9)	42	1.36%
1.8 (1.8.6.6)	37	1.20%
1.8 (1.8.8.6)	35	1.13%
Other	531	17.15%
XMail (2,537 servers)
Version	Number of Servers	Percent
1.22	943	37.17%
1.21	454	17.90%
1.24	271	10.68%
1.20	216	8.51%
1.17	187	7.37%
1.23	138	5.44%
1.12	86	3.39%
1.18	59	2.33%
1.16	43	1.69%
1.10	32	1.26%
1.15	27	1.06%
Other	81	3.19%
SurgeSMTP (1,714 servers)
Version	Number of Servers	Percent
3.8f3-3	458	26.72%
3.8f2-2	317	18.49%
3.7b8-8	247	14.41%
3.6f5-5	130	7.58%
3.5b3-3	75	4.38%
3.8i-1	66	3.85%
3.0c2-2	64	3.73%
3.7b6-6	50	2.92%
3.8g-21	30	1.75%
2.1c7-7	26	1.52%
2.0g2-1	25	1.46%
Other	226	13.19%
Gordano Messaging Suite (GMS) (1,485 servers)
Version	Number of Servers	Percent
Other	1,485	100.00%
Qmail Toaster (1,302 servers)
Version	Number of Servers	Percent
1.3	694	53.30%
1.2	489	37.56%
1.0	118	9.06%
Other	1	0.08%
NetIQ MailMarshal (1,222 servers)
Version	Number of Servers	Percent
6.0.3.8	903	73.90%
5.5.6.7	83	6.79%
6.1.3.15	59	4.83%
5.5.5.9	35	2.86%
5.5.4.16	31	2.54%
5.5.6.6	26	2.13%
5.5.6.5	23	1.88%
5.5.5.6	13	1.06%
Other	49	4.01%
Post.Office (1,213 servers)
Version	Number of Servers	Percent
3.5.3	386	31.82%
3.5.3J	106	8.74%
3.8.3	73	6.02%
4.0.1	68	5.61%
3.6.3	64	5.28%
3.6.2	46	3.79%
3.1.2J	46	3.79%
3.9.1	43	3.54%
3.1.2	36	2.97%
3.9.2.3	29	2.39%
3.9.2	29	2.39%
3.8.4	26	2.14%
3.9.0	26	2.14%
3.5.2	25	2.06%
4.0.0.2	23	1.90%
3.8.7.4	22	1.81%
3.6.0	22	1.81%
4.0.0.1	15	1.24%
Other	128	10.55%
InterScan VirusWall (1,161 servers)
Version	Number of Servers	Percent
Other	1,161	100.00%
Interscan (988 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	221	22.37%
3.81-Build_1022	123	12.45%
3.8-Build_3013	106	10.73%
3.55 (build 1029)	90	9.11%
3.53 (build 2011)	88	8.91%
3.53 (build 2017)	78	7.89%
3.53 (build 2013)	42	4.25%
3.55 (build 1020)	34	3.44%
3.53 (build 1493)	32	3.24%
3.52 (build 1375)	26	2.63%
3.8-Build_1080	21	2.13%
3.8-Build_3065	14	1.42%
3.81-Build_1084	14	1.42%
Other	99	10.02%
VisNetic (656 servers)
Version	Number of Servers	Percent
8.5.0.8	124	18.90%
7.2.4.1	61	9.30%
5.8.6.6	45	6.86%
8.0.3.0	41	6.25%
8.3.5.0	38	5.79%
5.0.2.3	38	5.79%
6.2.2.0	36	5.49%
5.5.8.3	34	5.18%
8.0.3.1	32	4.88%
7.6.1.0	29	4.42%
8.3.6	23	3.51%
8.0.3	19	2.90%
8.5.0.5	18	2.74%
5.4.5.4	17	2.59%
5.3.5.0	15	2.29%
7.5.3.0	13	1.98%
8.3.0.1	11	1.68%
7.2.4.0	10	1.52%
5.8.6.4	9	1.37%
Other	43	6.55%
Mirapoint (555 servers)
Version	Number of Servers	Percent
3.8.3-GA	120	21.62%
3.7.5a-GA	102	18.38%
3.8.2-GA	83	14.95%
3.7.4b-GA	41	7.39%
3.7.3a-GA	41	7.39%
3.7.5-GA	27	4.86%
3.7.2-GA	18	3.24%
3.7.1-GA	15	2.70%
3.5.8-GR	14	2.52%
1.1.0	11	1.98%
3.8.4-GA	11	1.98%
3.7.0-GA	9	1.62%
3.8.0-FCS	9	1.62%
3.6.6-GR	8	1.44%
3.7.3-GA	7	1.26%
Other	39	7.03%
ModusMail (498 servers)
Version	Number of Servers	Percent
4.35.480.0	279	56.02%
4.1.361.21	30	6.02%
4.2.425.22	27	5.42%
3.1.302.0	24	4.82%
3.2.315.0	23	4.62%
3.1.297.0	19	3.82%
4.35.477.0	17	3.41%
4.3.459.0	14	2.81%
4.35.480.11	13	2.61%
4.1.361.0	9	1.81%
4.2.425.4	8	1.61%
4.2.425.16	6	1.20%
4.1.361.18	5	1.00%
4.2.420.0	5	1.00%
Other	19	3.82%
Mercury (305 servers)
Version	Number of Servers	Percent
1.48	133	43.61%
3.32	110	36.07%
3.21c	23	7.54%
3.31	15	4.92%
1.44	12	3.93%
1.47	6	1.97%
Other	6	1.97%
WebSTAR V (301 servers)
Version	Number of Servers	Percent
5.4.1	86	28.57%
5.4.0	86	28.57%
5.3.4	65	21.59%
5.3.3	28	9.30%
5.3.2	21	6.98%
5.3.0	9	2.99%
Other	6	1.99%
MagicMail (273 servers)
Version	Number of Servers	Percent
Other	273	100.00%
MAILsweeper (223 servers)
Version	Number of Servers	Percent
4.3.12.0	40	17.94%
4.3.20.0	34	15.25%
4.3.17.0	32	14.35%
4.3.19.0	30	13.45%
4.3.14.0	30	13.45%
4.2.10.0	13	5.83%
4.3.1.0	10	4.48%
4.3.10.0	10	4.48%
4.2.1.0	9	4.04%
4.3.6.0	8	3.59%
4.2.5.0	4	1.79%
Other	3	1.35%
Neon Mail Server (170 servers)
Version	Number of Servers	Percent
3.0.9	75	44.12%
3.0.7	56	32.94%
3.1.0	18	10.59%
3.0.6	9	5.29%
3.0.8	8	4.71%
3.0.4	2	1.18%
3.0.5	2	1.18%
Other	0	0.00%
MessageWall (130 servers)
Version	Number of Servers	Percent
1.0.8	100	76.92%
1.0.11	16	12.31%
1.1.23	7	5.38%
1.0.6	3	2.31%
1.1.0	2	1.54%
Other	2	1.54%
WebSTAR (122 servers)
Version	Number of Servers	Percent
Other	122	100.00%
OpenVMS (37 servers)
Version	Number of Servers	Percent
7.3	12	32.43%
8.2	11	29.73%
7.2	7	18.92%
8.3	6	16.22%
6.1	1	2.70%
Other	0	0.00%