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	2,458,100	100.0%
Number of Servers that didn't respond	425,372	17.30%
Server didn't open socket	414,300	16.85%
Server didn't provide banner	11,072	0.45%
Server provided banner	2,032,728	82.70%
Server banner identifies software in use	1,110,952	45.20%

As indicated by the above table, of the 2,458,100 servers queried, only 1,110,952 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	526,699	47.41%
Postfix	284,860	25.64%
Sendmail	120,390	10.84%
Microsoft	94,482	8.50%
MailEnable	33,656	3.03%
MDaemon	21,166	1.91%
IMail	7,489	0.67%
Lotus Domino	4,662	0.42%
WinWebMail	3,339	0.30%
CommuniGate Pro	3,193	0.29%
XMail	2,178	0.20%
Qmail Toaster	1,662	0.15%
Kerio	1,609	0.14%
Merak	1,222	0.11%
SurgeSMTP	1,052	0.09%
ArGoSoft	749	0.07%
GroupWise	492	0.04%
Post.Office	376	0.03%
Trend Micro	334	0.03%
MagicMail	324	0.03%
Gordano Messaging Suite (GMS)	322	0.03%
Mirapoint	154	0.01%
VisNetic	128	0.01%
InterScan VirusWall	124	0.01%
Mercury	58	0.01%
Interscan	47	0.00%
NetIQ MailMarshal	33	0.00%
WebSTAR V	28	0.00%
Neon Mail Server	25	0.00%
OpenSMTPD	24	0.00%
OpenVMS	21	0.00%
MessageWall	20	0.00%
WebSTAR	15	0.00%
ModusMail	14	0.00%
MAILsweeper	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (526,699 servers)
Version	Number of Servers	Percent
4.80	386,216	73.33%
4.76	25,883	4.91%
4.69	25,620	4.86%
4.72	24,795	4.71%
4.77	24,657	4.68%
4.80.1	14,576	2.77%
4.67	5,562	1.06%
Other	19,390	3.68%
Postfix (284,860 servers)
Version	Number of Servers	Percent
Other	284,860	100.00%
Sendmail (120,390 servers)
Version	Number of Servers	Percent
8.13.8	32,352	26.87%
8.13.1	18,144	15.07%
8.14.3	16,033	13.32%
8.14.5	13,711	11.39%
8.14.4	11,964	9.94%
8.12.11.20060308	4,582	3.81%
8.13.6.20060614	3,550	2.95%
8.14.2	3,299	2.74%
8.11.6	2,213	1.84%
8.12.10	1,959	1.63%
8.14.1	1,836	1.53%
8.13.6	1,630	1.35%
8.12.11.20060614	1,523	1.27%
8.13.7	1,388	1.15%
Other	6,206	5.15%
Microsoft (94,482 servers)
Version	Number of Servers	Percent
6.0.3790.4675	76,287	80.74%
6.0.3790.3959	10,046	10.63%
6.0.3790.1830	2,750	2.91%
7.5.7601.17514	1,788	1.89%
5.0.2195.7381	1,009	1.07%
Other	2,602	2.75%
MailEnable (33,656 servers)
Version	Number of Servers	Percent
1.986--	6,766	20.10%
5.10--	2,611	7.76%
4.26--	2,189	6.50%
6.5--	1,562	4.64%
6.0--	1,342	3.99%
1.981--	1,183	3.51%
1.983--	729	2.17%
0-3.63-	680	2.02%
5.51--	624	1.85%
6.03--	621	1.85%
3.62--	614	1.82%
6.60--	515	1.53%
5.11--	482	1.43%
6.57--	451	1.34%
6.53--	429	1.27%
0-1.87-	378	1.12%
Other	12,480	37.08%
MDaemon (21,166 servers)
Version	Number of Servers	Percent
13.0.3	3,844	18.16%
11.0.3	1,924	9.09%
11.0.0	1,288	6.09%
13.0.2	1,093	5.16%
12.5.6	1,015	4.80%
10.0.0	809	3.82%
10.1.2	698	3.30%
10.1.1	669	3.16%
9.6.1	494	2.33%
12.5.4	469	2.22%
9.6.6	457	2.16%
10.1.0	435	2.06%
12.5.8	355	1.68%
13.0.0	324	1.53%
12.0.3	312	1.47%
13.0.1	302	1.43%
12.5.3	299	1.41%
9.6.2	298	1.41%
9.5.2	290	1.37%
9.6.5	275	1.30%
10.0.5	256	1.21%
10.0.2	245	1.16%
9.5.1	232	1.10%
9.5.6	230	1.09%
12.0.4	218	1.03%
Other	4,335	20.48%
IMail (7,489 servers)
Version	Number of Servers	Percent
8.22	1,336	17.84%
11.5	811	10.83%
12.1.0.270	516	6.89%
12.2.0.169	453	6.05%
9.23	441	5.89%
8.15	425	5.67%
11.01	397	5.30%
11.03	395	5.27%
8.05	276	3.69%
10.02	215	2.87%
12.2.0.235	203	2.71%
12.0.0.384	165	2.20%
7.07	160	2.14%
7.15	133	1.78%
8.00	131	1.75%
6.06	131	1.75%
11.02	124	1.66%
11.0	117	1.56%
10.01	111	1.48%
12.0.0.348	95	1.27%
9.21	76	1.01%
Other	778	10.39%
Lotus Domino (4,662 servers)
Version	Number of Servers	Percent
8.5.3	838	17.98%
8.5.3FP2	329	7.06%
8.5.2	315	6.76%
8.5.3FP1	233	5.00%
8.5.2FP2	221	4.74%
8.5.1	208	4.46%
7.0.2	186	3.99%
8.5.3FP3	163	3.50%
8.5	152	3.26%
8.5.2FP3	136	2.92%
8.5.2FP4	116	2.49%
7.0.3	106	2.27%
8.5.1FP5	92	1.97%
8.5.2FP1	90	1.93%
7.0.1	88	1.89%
8.0.1	82	1.76%
8.0.2	79	1.69%
6.5.4	75	1.61%
7.0	70	1.50%
6.5.3	67	1.44%
6.5.1	67	1.44%
8.0	64	1.37%
6.5.5	50	1.07%
Other	835	17.91%
WinWebMail (3,339 servers)
Version	Number of Servers	Percent
3.8.1.3	682	20.43%
3.8.0.1	434	13.00%
3.7.6.1	348	10.42%
3.8.1.5	290	8.69%
3.7.3.1	247	7.40%
3.8.2.1	246	7.37%
3.8.1.1	238	7.13%
3.7.7.3	216	6.47%
3.8.3.1	145	4.34%
3.7.1.1	118	3.53%
3.7.5.1	94	2.82%
3.7.7.1	53	1.59%
3.6.3.1	50	1.50%
3.7.0.3	47	1.41%
3.7.0.5	39	1.17%
3.8.3.3	36	1.08%
3.7.0.7	34	1.02%
Other	22	0.66%
CommuniGate Pro (3,193 servers)
Version	Number of Servers	Percent
5.1.16	274	8.58%
5.4.8	184	5.76%
4.1.8	133	4.17%
5.4.4	126	3.95%
5.4.6	109	3.41%
5.2.20	103	3.23%
5.3.13	93	2.91%
5.4.5	84	2.63%
5.4.7	82	2.57%
5.4.1	75	2.35%
4.2.10	74	2.32%
5.2.16	69	2.16%
5.3.15	64	2.00%
5.1.12	63	1.97%
5.0.14	60	1.88%
5.2.19	58	1.82%
5.4.3	58	1.82%
5.2.3	58	1.82%
6.0	58	1.82%
5.4.2	54	1.69%
5.2.14	45	1.41%
5.4.0	42	1.32%
5.3.8	37	1.16%
6.0.1	36	1.13%
5.3.9	36	1.13%
5.3.10	36	1.13%
5.2.8	34	1.06%
5.2.12	34	1.06%
5.1.13	33	1.03%
5.2.13	33	1.03%
Other	948	29.69%
XMail (2,178 servers)
Version	Number of Servers	Percent
1.27	613	28.15%
1.22	515	23.65%
1.25	368	16.90%
1.26	243	11.16%
1.24	156	7.16%
1.21	78	3.58%
1.23	46	2.11%
1.20	34	1.56%
1.17	32	1.47%
Other	93	4.27%
Qmail Toaster (1,662 servers)
Version	Number of Servers	Percent
1.3	1,583	95.25%
1.2	47	2.83%
Other	32	1.93%
Kerio (1,609 servers)
Version	Number of Servers	Percent
6.7.3	245	15.23%
6.6.2	160	9.94%
6.7.0	149	9.26%
6.5.0	124	7.71%
6.5.2	111	6.90%
6.7.2	94	5.84%
6.4.1	92	5.72%
6.7.1	89	5.53%
6.3.1	77	4.79%
6.4.0	63	3.92%
6.6.1	53	3.29%
6.5.1	50	3.11%
6.6.0	49	3.05%
6.4.2	36	2.24%
6.3.0	34	2.11%
6.0.10	20	1.24%
6.2.0	17	1.06%
Other	146	9.07%
Merak (1,222 servers)
Version	Number of Servers	Percent
8.0.3	467	38.22%
8.9.1	137	11.21%
8.5.0	87	7.12%
7.5.2	61	4.99%
8.3.8	59	4.83%
7.4.5	51	4.17%
7.6.4	49	4.01%
9.0.0	24	1.96%
7.4.2	20	1.64%
7.2.0	19	1.55%
7.0.1	18	1.47%
7.6.1	17	1.39%
8.9.0	15	1.23%
8.3.15	15	1.23%
7.6.0	14	1.15%
4.4.2	14	1.15%
6.2.1	13	1.06%
Other	142	11.62%
SurgeSMTP (1,052 servers)
Version	Number of Servers	Percent
6.1c-1	175	16.63%
5.3h2-2	123	11.69%
6.3c2-2	120	11.41%
5.2a-1	93	8.84%
3.9e-1	53	5.04%
6.0a5-5	40	3.80%
3.8k4-4	30	2.85%
6.0a4-4	30	2.85%
4.0u4-4	25	2.38%
5.0e4-4	21	2.00%
4.2d2-2	19	1.81%
4.3g2-2	18	1.71%
3.8i3-3	17	1.62%
3.6f5-5	13	1.24%
4.3g4-4	11	1.05%
5.0e3-3	11	1.05%
3.9h-18	11	1.05%
Other	242	23.00%
ArGoSoft (749 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	181	24.17%
1.8 (1.8.9.5)	112	14.95%
1.8 (1.8.9.3)	103	13.75%
1.8 (1.8.9.1)	76	10.15%
1.8 (1.8.8.8)	48	6.41%
1.8 (1.8.8.7)	44	5.87%
1.8 (1.8.9.2)	26	3.47%
1.8 (1.8.9.4)	21	2.80%
1.8 (1.8.8.9)	13	1.74%
1.8 (1.8.6.0)	13	1.74%
1.8 (1.8.8.1)	8	1.07%
Other	104	13.89%
GroupWise (492 servers)
Version	Number of Servers	Percent
7.0.3	94	19.11%
8.0.2	91	18.50%
6.5.7	53	10.77%
7.0.4	37	7.52%
7.0.2	30	6.10%
6.5.6	24	4.88%
8.0.1	19	3.86%
7.0.1	19	3.86%
6.0.4	17	3.46%
6.5.4	17	3.46%
6.5.1	15	3.05%
8.0.3	14	2.85%
12.0.1	11	2.24%
12.0.0	11	2.24%
8.0.0	8	1.63%
6.5.5	7	1.42%
7.0	7	1.42%
Other	18	3.66%
Post.Office (376 servers)
Version	Number of Servers	Percent
3.5.3	51	13.56%
4.1.0.2	35	9.31%
4.1.2.4	30	7.98%
4.0.1	25	6.65%
4.1.1	18	4.79%
3.9.2.3	15	3.99%
3.5.3J	13	3.46%
3.8.3	13	3.46%
4.2	12	3.19%
4.1.0.3	10	2.66%
3.9.2	10	2.66%
3.1.2J	9	2.39%
3.1.2	8	2.13%
4.0.1.1	8	2.13%
3.6.2	8	2.13%
4.1.0.4	8	2.13%
4.2.1.3	7	1.86%
4.1.2.3	7	1.86%
4.2.1.1	7	1.86%
3.9.1.2	6	1.60%
3.9.1	6	1.60%
4.2.1	5	1.33%
3.8.7.4	5	1.33%
3.5.1	5	1.33%
3.9.2.2	4	1.06%
4.1	4	1.06%
3.9.1.3	4	1.06%
4.0.0.1	4	1.06%
3.9.2.1	4	1.06%
4.1.2.2	4	1.06%
Other	31	8.24%
Trend Micro (334 servers)
Version	Number of Servers	Percent
5.7	129	38.62%
5.5	80	23.95%
5.18	59	17.66%
7.0	32	9.58%
7.1	23	6.89%
Other	11	3.29%
MagicMail (324 servers)
Version	Number of Servers	Percent
Other	324	100.00%
Gordano Messaging Suite (GMS) (322 servers)
Version	Number of Servers	Percent
Other	322	100.00%
Mirapoint (154 servers)
Version	Number of Servers	Percent
4.3.5-GA	15	9.74%
3.10.10a-GA	14	9.09%
4.2.3-GA	11	7.14%
4.1.10-GA	10	6.49%
3.10.9-GA	9	5.84%
4.1.9-GA	8	5.19%
4.3.3-GA	8	5.19%
4.2.4-GA	7	4.55%
3.10.8-GA	6	3.90%
4.1.4-GA	6	3.90%
3.10.5-GA	6	3.90%
3.8.5-GA	5	3.25%
3.8.3-GA	5	3.25%
3.10.7-GA	5	3.25%
4.1.3-GA	4	2.60%
3.8.4-GA	4	2.60%
4.1.8-GA	4	2.60%
3.10.4-GA	3	1.95%
4.3.4-GA	3	1.95%
4.1.5-GA	3	1.95%
3.7.5a-GA	2	1.30%
3.10.3-GA	2	1.30%
3.8.6-GA	2	1.30%
3.10.2-GA	2	1.30%
3.8.7a	2	1.30%
4.0.5a	2	1.30%
Other	6	3.90%
VisNetic (128 servers)
Version	Number of Servers	Percent
9.3.2.0	38	29.69%
9.1.4.1	16	12.50%
8.0.3.1	6	4.69%
5.8.6.6	6	4.69%
7.6.1.0	6	4.69%
8.5.0.8	6	4.69%
5.5.8.3	6	4.69%
7.2.4.1	5	3.91%
6.2.2.0	4	3.12%
8.0.3.0	4	3.12%
8.0.3	4	3.12%
5.0.2.3	4	3.12%
9.1.4.0	3	2.34%
5.4.5.4	3	2.34%
5.0.2.1	2	1.56%
5.8.6.4	2	1.56%
Other	13	10.16%
InterScan VirusWall (124 servers)
Version	Number of Servers	Percent
Other	124	100.00%
Mercury (58 servers)
Version	Number of Servers	Percent
1.48	33	56.90%
3.32	14	24.14%
3.21c	3	5.17%
3.01a	2	3.45%
1.47	2	3.45%
3.21	1	1.72%
1.44	1	1.72%
4.x	1	1.72%
3.30	1	1.72%
Other	0	0.00%
Interscan (47 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	10	21.28%
3.81-Build_1022	8	17.02%
3.55 (build 1029)	6	12.77%
3.53 (build 2011)	4	8.51%
3.81-Build_1084	3	6.38%
3.8-Build_3013	3	6.38%
3.53 (build 1493)	3	6.38%
3.53 (build 2017)	3	6.38%
3.53 (build 2013)	2	4.26%
3.5 (build 1294)	1	2.13%
3.51 (build 1337)	1	2.13%
3.55 (build 1020)	1	2.13%
3.8-Build_3045	1	2.13%
3.8-Build_1080	1	2.13%
Other	0	0.00%
NetIQ MailMarshal (33 servers)
Version	Number of Servers	Percent
6.0.3.8	22	66.67%
5.5.6.7	2	6.06%
5.5.6.5	2	6.06%
5.5.6.6	2	6.06%
6.1.3.15	2	6.06%
5.5.5.6	1	3.03%
5.5.4.17	1	3.03%
5.5.4.16	1	3.03%
Other	0	0.00%
WebSTAR V (28 servers)
Version	Number of Servers	Percent
5.4.1	13	46.43%
5.4.0	8	28.57%
5.3.4	3	10.71%
5.3.3	2	7.14%
5.3.2	2	7.14%
Other	0	0.00%
Neon Mail Server (25 servers)
Version	Number of Servers	Percent
3.0.7	7	28.00%
3.1.3	4	16.00%
3.1.4	3	12.00%
3.1.2	3	12.00%
3.1.0	3	12.00%
3.0.9	2	8.00%
3.1.1	1	4.00%
3.1.5	1	4.00%
3.0.6	1	4.00%
Other	0	0.00%
OpenSMTPD (24 servers)
Version	Number of Servers	Percent
Other	24	100.00%
OpenVMS (21 servers)
Version	Number of Servers	Percent
8.3	10	47.62%
8.4	6	28.57%
7.3	4	19.05%
8.2	1	4.76%
Other	0	0.00%
MessageWall (20 servers)
Version	Number of Servers	Percent
1.0.8	19	95.00%
1.0.6	1	5.00%
Other	0	0.00%
WebSTAR (15 servers)
Version	Number of Servers	Percent
Other	15	100.00%
ModusMail (14 servers)
Version	Number of Servers	Percent
4.35.477.0	6	42.86%
4.35.480.0	2	14.29%
4.1.361.21	1	7.14%
3.2.315.0	1	7.14%
4.0.340.3	1	7.14%
4.3.459.0	1	7.14%
4.35.477.8	1	7.14%
3.1.302.0	1	7.14%
Other	0	0.00%
MAILsweeper (5 servers)
Version	Number of Servers	Percent
4.3.17.0	2	40.00%
4.3.19.0	2	40.00%
4.3.20.0	1	20.00%
Other	0	0.00%