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	2,009,674	100.0%
Number of Servers that didn't respond	325,269	16.19%
Server didn't open socket	312,800	15.56%
Server didn't provide banner	12,469	0.62%
Server provided banner	1,684,405	83.81%
Server banner identifies software in use	936,441	46.60%

As indicated by the above table, of the 2,009,674 servers queried, only 936,441 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
Exim	296,129	31.62%
Postfix	186,168	19.88%
Microsoft	178,589	19.07%
Sendmail	171,066	18.27%
MailEnable	29,170	3.11%
MDaemon	22,409	2.39%
IMail	14,446	1.54%
Kerio	7,291	0.78%
Lotus Domino	5,435	0.58%
WinWebMail	4,936	0.53%
CommuniGate Pro	3,914	0.42%
Merak	3,097	0.33%
XMail	2,605	0.28%
Qmail Toaster	1,778	0.19%
ArGoSoft	1,581	0.17%
GroupWise	1,515	0.16%
SurgeSMTP	1,451	0.15%
Trend Micro	1,210	0.13%
Gordano Messaging Suite (GMS)	660	0.07%
Post.Office	558	0.06%
MagicMail	480	0.05%
Mirapoint	412	0.04%
VisNetic	368	0.04%
InterScan VirusWall	343	0.04%
NetIQ MailMarshal	199	0.02%
Interscan	153	0.02%
Mercury	99	0.01%
WebSTAR V	97	0.01%
Neon Mail Server	91	0.01%
ModusMail	51	0.01%
MessageWall	50	0.01%
WebSTAR	33	0.00%
MAILsweeper	28	0.00%
OpenVMS	26	0.00%
OpenSMTPD	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (296,129 servers)
Version	Number of Servers	Percent
4.69	247,818	83.69%
4.63	13,809	4.66%
4.67	13,492	4.56%
4.66	4,158	1.40%
4.68	2,985	1.01%
Other	13,867	4.68%
Postfix (186,168 servers)
Version	Number of Servers	Percent
Other	186,168	100.00%
Microsoft (178,589 servers)
Version	Number of Servers	Percent
6.0.3790.3959	153,508	85.96%
6.0.3790.1830	14,274	7.99%
5.0.2195.6713	7,024	3.93%
Other	3,783	2.12%
Sendmail (171,066 servers)
Version	Number of Servers	Percent
8.13.1	33,850	19.79%
8.13.8	23,991	14.02%
8.14.3	17,599	10.29%
8.12.11.20060614	14,867	8.69%
8.12.11.20060308	14,298	8.36%
8.13.6	11,311	6.61%
8.13.6.20060614	10,368	6.06%
8.12.10	6,477	3.79%
8.11.6	5,967	3.49%
8.14.2	5,288	3.09%
8.12.11	4,419	2.58%
8.14.1	4,305	2.52%
8.13.4	3,364	1.97%
8.13.7	3,152	1.84%
8.12.8	2,753	1.61%
8.9.3	1,758	1.03%
Other	7,299	4.27%
MailEnable (29,170 servers)
Version	Number of Servers	Percent
1.986--	8,214	28.16%
1.981--	3,830	13.13%
1.983--	2,478	8.50%
3.62--	1,591	5.45%
1.96--	731	2.51%
1.95--	715	2.45%
0-3.63-	686	2.35%
1.9--	579	1.98%
0-3.61-	496	1.70%
0-3.6-	483	1.66%
0-1.87-	456	1.56%
4.0--	424	1.45%
0-2.53-	421	1.44%
1.8--	407	1.40%
0-3.62-	387	1.33%
0-3.14-	372	1.28%
--3.63	362	1.24%
0-2.37-	328	1.12%
Other	6,210	21.29%
MDaemon (22,409 servers)
Version	Number of Servers	Percent
10.1.2	4,495	20.06%
10.1.1	2,274	10.15%
10.0.0	1,428	6.37%
9.6.1	1,041	4.65%
10.0.5	959	4.28%
9.6.6	923	4.12%
10.1.0	826	3.69%
9.6.5	728	3.25%
10.0.4	720	3.21%
9.5.2	644	2.87%
10.0.2	568	2.53%
9.6.4	542	2.42%
9.5.1	519	2.32%
8.1.3	511	2.28%
9.5.6	493	2.20%
9.6.2	484	2.16%
9.0.4	459	2.05%
9.6.3	312	1.39%
6.8.5	292	1.30%
7.2.3	288	1.29%
9.5.5	265	1.18%
9.0.1	258	1.15%
10.0.1	248	1.11%
7.2.0	243	1.08%
Other	2,889	12.89%
IMail (14,446 servers)
Version	Number of Servers	Percent
8.22	2,681	18.56%
8.15	1,424	9.86%
11.0	1,321	9.14%
9.23	1,154	7.99%
10.02	927	6.42%
8.05	784	5.43%
11.01	649	4.49%
9.10	574	3.97%
9.20	558	3.86%
7.07	513	3.55%
10.01	498	3.45%
9.21	416	2.88%
7.15	365	2.53%
6.06	299	2.07%
8.00	275	1.90%
8.04	198	1.37%
8.21	193	1.34%
8.10	172	1.19%
10.0	172	1.19%
9.22	152	1.05%
8.01	149	1.03%
Other	972	6.73%
Kerio (7,291 servers)
Version	Number of Servers	Percent
6.7.2	1,428	19.59%
6.7.3	1,138	15.61%
6.7.0	846	11.60%
6.6.2	787	10.79%
6.7.1	556	7.63%
6.5.2	356	4.88%
6.5.0	322	4.42%
6.4.1	245	3.36%
6.3.1	230	3.15%
6.6.0	186	2.55%
6.5.1	172	2.36%
6.4.0	150	2.06%
6.6.1	140	1.92%
6.4.2	122	1.67%
6.3.0	101	1.39%
Other	512	7.02%
Lotus Domino (5,435 servers)
Version	Number of Servers	Percent
8.5.1	596	10.97%
8.5	556	10.23%
7.0.2	414	7.62%
8.0.2	299	5.50%
8.0.1	272	5.00%
7.0.3	269	4.95%
7.0.1	228	4.20%
6.5.4	203	3.74%
6.5.1	188	3.46%
8.5FP1	170	3.13%
6.5.3	164	3.02%
7.0.2FP2	159	2.93%
7.0.3FP1	154	2.83%
7.0	135	2.48%
6.5.5	134	2.47%
8.0	130	2.39%
6.5	124	2.28%
5.0.11	76	1.40%
7.0.2FP1	63	1.16%
6.5.2	61	1.12%
7.0.2FP3	59	1.09%
6.5.6	57	1.05%
Other	924	17.00%
WinWebMail (4,936 servers)
Version	Number of Servers	Percent
3.8.0.1	1,197	24.25%
3.7.6.1	913	18.50%
3.7.3.1	712	14.42%
3.7.7.3	690	13.98%
3.7.1.1	385	7.80%
3.7.5.1	237	4.80%
3.6.3.1	191	3.87%
3.7.0.5	168	3.40%
3.7.7.1	167	3.38%
3.7.0.3	120	2.43%
3.7.0.7	119	2.41%
Other	37	0.75%
CommuniGate Pro (3,914 servers)
Version	Number of Servers	Percent
5.2.16	294	7.51%
4.1.8	249	6.36%
5.2.14	162	4.14%
5.1.13	159	4.06%
4.2.10	159	4.06%
5.2.18	157	4.01%
5.1.16	138	3.53%
5.2.12	131	3.35%
5.2.13	122	3.12%
5.2.17	109	2.78%
5.2.3	102	2.61%
5.2.8	94	2.40%
5.1.12	94	2.40%
5.2.10	87	2.22%
5.0.14	83	2.12%
5.3.0	72	1.84%
5.2.11	68	1.74%
5.0.13	67	1.71%
5.2.15	62	1.58%
5.1.14	60	1.53%
5.2.6	59	1.51%
5.0.9	58	1.48%
5.2.9	56	1.43%
5.1.9	54	1.38%
5.2.0	43	1.10%
4.2.8	43	1.10%
4.2.9	43	1.10%
Other	1,089	27.82%
Merak (3,097 servers)
Version	Number of Servers	Percent
8.0.3	1,289	41.62%
8.9.1	296	9.56%
8.5.0	194	6.26%
7.4.5	177	5.72%
7.5.2	140	4.52%
7.6.4	125	4.04%
8.3.8	120	3.87%
7.4.2	52	1.68%
8.2.13	47	1.52%
9.0.0	46	1.49%
7.6.1	46	1.49%
7.2.0	45	1.45%
8.2.4	35	1.13%
8.3.15	34	1.10%
7.0.1	33	1.07%
6.2.1	32	1.03%
Other	386	12.46%
XMail (2,605 servers)
Version	Number of Servers	Percent
1.25	707	27.14%
1.22	646	24.80%
1.24	382	14.66%
1.26	292	11.21%
1.21	163	6.26%
1.23	83	3.19%
1.20	77	2.96%
1.17	70	2.69%
1.12	62	2.38%
Other	123	4.72%
Qmail Toaster (1,778 servers)
Version	Number of Servers	Percent
1.3	1,581	88.92%
1.2	150	8.44%
1.0	30	1.69%
Other	17	0.96%
ArGoSoft (1,581 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	298	18.85%
1.8 (1.8.9.6)	233	14.74%
1.8 (1.8.9.3)	220	13.92%
1.8 (1.8.9.1)	152	9.61%
1.8 (1.8.8.8)	121	7.65%
1.8 (1.8.8.7)	101	6.39%
1.8 (1.8.9.2)	65	4.11%
1.8 (1.8.9.4)	45	2.85%
1.8 (1.8.8.9)	39	2.47%
1.8 (1.8.8.1)	34	2.15%
1.8 (1.8.6.0)	28	1.77%
1.8 (1.8.9.0)	27	1.71%
1.8 (1.8.8.2)	17	1.08%
Other	201	12.71%
GroupWise (1,515 servers)
Version	Number of Servers	Percent
7.0.3	481	31.75%
7.0.2	190	12.54%
6.5.7	172	11.35%
8.0.1	131	8.65%
7.0.1	104	6.86%
6.5.4	90	5.94%
8.0.0	78	5.15%
6.5.6	58	3.83%
6.0.4	53	3.50%
6.5.1	39	2.57%
6.5.5	26	1.72%
7.0	19	1.25%
Other	74	4.88%
SurgeSMTP (1,451 servers)
Version	Number of Servers	Percent
3.9e-1	265	18.26%
4.2a3-3	227	15.64%
4.2d2-2	218	15.02%
4.0u4-4	120	8.27%
3.8k4-4	90	6.20%
3.8f3-3	41	2.83%
3.9c-1	39	2.69%
3.8i3-3	37	2.55%
3.7b8-8	35	2.41%
3.6f5-5	31	2.14%
3.9g2-2	27	1.86%
3.9h-65	27	1.86%
3.5b3-3	20	1.38%
3.8f2-2	19	1.31%
3.0c2-2	15	1.03%
4.0u3-3	15	1.03%
Other	225	15.51%
Trend Micro (1,210 servers)
Version	Number of Servers	Percent
5.7	571	47.19%
5.5	343	28.35%
5.18	177	14.63%
7.0	92	7.60%
Other	27	2.23%
Gordano Messaging Suite (GMS) (660 servers)
Version	Number of Servers	Percent
Other	660	100.00%
Post.Office (558 servers)
Version	Number of Servers	Percent
3.5.3	105	18.82%
4.1.0.2	60	10.75%
3.5.3J	45	8.06%
4.0.1	45	8.06%
3.8.3	30	5.38%
3.9.2.3	17	3.05%
4.1.0.4	17	3.05%
3.1.2J	16	2.87%
4.1.1	15	2.69%
3.6.3	15	2.69%
3.9.1	15	2.69%
3.6.2	15	2.69%
3.9.2	14	2.51%
3.8.7.4	12	2.15%
3.1.2	11	1.97%
4.1	10	1.79%
4.0.0.2	10	1.79%
4.1.0.3	8	1.43%
3.9.1.3	8	1.43%
3.9.2.1	8	1.43%
3.8.4	8	1.43%
3.9.0	7	1.25%
4.0.0.1	7	1.25%
4.0.1.1	7	1.25%
3.9.1.2	6	1.08%
Other	47	8.42%
MagicMail (480 servers)
Version	Number of Servers	Percent
Other	480	100.00%
Mirapoint (412 servers)
Version	Number of Servers	Percent
3.8.4-GA	48	11.65%
3.8.3-GA	44	10.68%
3.10.5-GA	39	9.47%
3.10.7-GA	35	8.50%
3.10.8-GA	35	8.50%
3.10.4-GA	27	6.55%
4.1.3-GA	16	3.88%
4.1.8-GA	16	3.88%
3.10.6-GA	16	3.88%
3.10.3-GA	13	3.16%
3.8.6-GA	13	3.16%
3.8.7a	13	3.16%
3.8.5-GA	12	2.91%
4.1.4-GA	11	2.67%
3.7.5a-GA	10	2.43%
3.8.2-GA	9	2.18%
4.1.5-GA	8	1.94%
4.0.5a	7	1.70%
4.1.7a-GA	7	1.70%
4.1.6-GA	6	1.46%
3.7.4b-GA	5	1.21%
3.10.2-GA	5	1.21%
Other	17	4.13%
VisNetic (368 servers)
Version	Number of Servers	Percent
9.3.2.0	140	38.04%
9.1.4.1	50	13.59%
5.8.6.6	18	4.89%
8.5.0.8	13	3.53%
5.0.2.3	13	3.53%
6.2.2.0	12	3.26%
5.5.8.3	12	3.26%
9.1.4.0	11	2.99%
8.0.3.1	10	2.72%
8.3.5.0	9	2.45%
7.6.1.0	8	2.17%
8.3.6	7	1.90%
8.0.3.0	7	1.90%
7.2.4.1	7	1.90%
8.0.3	6	1.63%
5.4.5.4	6	1.63%
5.3.5.0	5	1.36%
5.0.2.1	4	1.09%
Other	30	8.15%
InterScan VirusWall (343 servers)
Version	Number of Servers	Percent
Other	343	100.00%
NetIQ MailMarshal (199 servers)
Version	Number of Servers	Percent
6.0.3.8	151	75.88%
6.1.3.15	14	7.04%
5.5.6.7	12	6.03%
5.5.6.6	4	2.01%
5.5.6.5	4	2.01%
5.5.4.16	4	2.01%
5.5.4.17	2	1.01%
5.5.5.6	2	1.01%
Other	6	3.02%
Interscan (153 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	27	17.65%
3.81-Build_1022	20	13.07%
3.55 (build 1029)	17	11.11%
3.53 (build 2017)	16	10.46%
3.81-Build_1084	12	7.84%
3.8-Build_3013	11	7.19%
3.53 (build 1493)	9	5.88%
3.53 (build 2011)	8	5.23%
3.53 (build 2013)	6	3.92%
3.55 (build 1020)	5	3.27%
3.52 (build 1375)	3	1.96%
3.53 (build 1494)	2	1.31%
3.81-Build_1055	2	1.31%
3.51 (build 1337)	2	1.31%
3.8-Build_1080	2	1.31%
Other	11	7.19%
Mercury (99 servers)
Version	Number of Servers	Percent
1.48	49	49.49%
3.32	28	28.28%
3.21c	9	9.09%
1.47	3	3.03%
3.21	2	2.02%
3.01a	2	2.02%
1.49	2	2.02%
1.44	1	1.01%
4.52	1	1.01%
3.31	1	1.01%
3.30	1	1.01%
Other	0	0.00%
WebSTAR V (97 servers)
Version	Number of Servers	Percent
5.4.1	32	32.99%
5.4.0	25	25.77%
5.3.4	24	24.74%
5.3.2	8	8.25%
5.3.3	6	6.19%
5.3.0	1	1.03%
5.3.1	1	1.03%
Other	0	0.00%
Neon Mail Server (91 servers)
Version	Number of Servers	Percent
3.1.3	23	25.27%
3.0.7	16	17.58%
3.0.9	12	13.19%
3.1.4	11	12.09%
3.1.2	10	10.99%
3.1.0	9	9.89%
3.1.5	5	5.49%
3.1.1	2	2.20%
3.0.8	1	1.10%
3.0.6	1	1.10%
3.0.5	1	1.10%
Other	0	0.00%
ModusMail (51 servers)
Version	Number of Servers	Percent
3.2.315.0	14	27.45%
4.35.477.0	9	17.65%
4.35.480.0	7	13.73%
3.1.302.0	6	11.76%
4.2.420.0	5	9.80%
4.1.361.21	2	3.92%
3.1.293.1	2	3.92%
4.35.480.11	2	3.92%
4.2.425.22	1	1.96%
4.0.340.3	1	1.96%
4.3.459.0	1	1.96%
4.35.477.8	1	1.96%
Other	0	0.00%
MessageWall (50 servers)
Version	Number of Servers	Percent
1.0.8	32	64.00%
1.0.11	15	30.00%
1.1.0	2	4.00%
1.0.6	1	2.00%
Other	0	0.00%
WebSTAR (33 servers)
Version	Number of Servers	Percent
Other	33	100.00%
MAILsweeper (28 servers)
Version	Number of Servers	Percent
4.3.20.0	7	25.00%
4.3.17.0	5	17.86%
4.3.14.0	5	17.86%
4.3.1.0	3	10.71%
4.2.10.0	2	7.14%
4.3.6.0	2	7.14%
4.3.19.0	1	3.57%
4.3.10.0	1	3.57%
4.3.12.0	1	3.57%
4.2.5.0	1	3.57%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	17	65.38%
7.3	5	19.23%
8.2	2	7.69%
6.1	1	3.85%
7.2	1	3.85%
Other	0	0.00%
OpenSMTPD (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%