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	2,323,454	100.0%
Number of Servers that didn't respond	395,291	17.01%
Server didn't open socket	386,024	16.61%
Server didn't provide banner	9,267	0.40%
Server provided banner	1,928,163	82.99%
Server banner identifies software in use	1,070,553	46.08%

As indicated by the above table, of the 2,323,454 servers queried, only 1,070,553 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	540,956	50.53%
Postfix	279,640	26.12%
Sendmail	105,689	9.87%
Microsoft	69,597	6.50%
MailEnable	31,735	2.96%
MDaemon	19,046	1.78%
IMail	6,027	0.56%
Lotus Domino	3,645	0.34%
CommuniGate Pro	2,804	0.26%
WinWebMail	2,558	0.24%
XMail	1,831	0.17%
Qmail Toaster	1,430	0.13%
Kerio	1,218	0.11%
Merak	973	0.09%
SurgeSMTP	922	0.09%
ArGoSoft	537	0.05%
GroupWise	365	0.03%
MagicMail	290	0.03%
Gordano Messaging Suite (GMS)	278	0.03%
Post.Office	273	0.03%
Trend Micro	228	0.02%
Mirapoint	111	0.01%
InterScan VirusWall	92	0.01%
VisNetic	91	0.01%
OpenSMTPD	40	0.00%
Mercury	38	0.00%
Interscan	29	0.00%
NetIQ MailMarshal	21	0.00%
WebSTAR V	21	0.00%
OpenVMS	19	0.00%
Neon Mail Server	16	0.00%
WebSTAR	11	0.00%
MessageWall	11	0.00%
ModusMail	8	0.00%
MAILsweeper	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (540,956 servers)
Version	Number of Servers	Percent
4.80.1	298,546	55.19%
4.80	153,757	28.42%
4.72	20,906	3.86%
4.69	17,892	3.31%
4.76	15,448	2.86%
4.77	13,300	2.46%
Other	21,107	3.90%
Postfix (279,640 servers)
Version	Number of Servers	Percent
Other	279,640	100.00%
Sendmail (105,689 servers)
Version	Number of Servers	Percent
8.13.8	27,293	25.82%
8.13.1	15,262	14.44%
8.14.3	14,355	13.58%
8.14.4	13,023	12.32%
8.14.5	12,927	12.23%
8.12.11.20060308	3,781	3.58%
8.13.6.20060614	3,079	2.91%
8.14.2	2,510	2.37%
8.11.6	1,650	1.56%
8.12.10	1,506	1.42%
8.14.1	1,360	1.29%
8.13.6	1,163	1.10%
8.13.7	1,101	1.04%
Other	6,679	6.32%
Microsoft (69,597 servers)
Version	Number of Servers	Percent
6.0.3790.4675	56,340	80.95%
6.0.3790.3959	6,737	9.68%
7.5.7601.17514	1,907	2.74%
6.0.3790.1830	1,782	2.56%
Other	2,831	4.07%
MailEnable (31,735 servers)
Version	Number of Servers	Percent
1.986--	4,720	14.87%
6.5--	2,194	6.91%
5.10--	2,094	6.60%
4.26--	1,624	5.12%
6.0--	1,303	4.11%
1.981--	904	2.85%
7.06--	763	2.40%
6.70--	550	1.73%
7.0--	537	1.69%
6.57--	499	1.57%
1.983--	493	1.55%
3.62--	480	1.51%
6.03--	462	1.46%
7.09--	453	1.43%
0-6.83-	425	1.34%
5.51--	416	1.31%
7.07--	397	1.25%
6.60--	395	1.24%
0-3.65-	363	1.14%
7.09--7.09	325	1.02%
5.11--	322	1.01%
Other	12,016	37.86%
MDaemon (19,046 servers)
Version	Number of Servers	Percent
13.5.1	2,129	11.18%
13.0.5	1,532	8.04%
11.0.3	1,436	7.54%
13.0.4	1,380	7.25%
11.0.0	1,161	6.10%
13.0.3	861	4.52%
10.0.0	662	3.48%
12.5.6	630	3.31%
10.1.2	533	2.80%
10.1.1	507	2.66%
13.5.0	469	2.46%
13.0.2	449	2.36%
9.6.1	380	2.00%
12.5.4	365	1.92%
9.6.6	357	1.87%
10.1.0	335	1.76%
9.6.2	270	1.42%
12.0.3	228	1.20%
9.5.2	218	1.14%
12.5.8	218	1.14%
10.0.2	206	1.08%
10.0.5	206	1.08%
12.5.3	203	1.07%
9.6.5	198	1.04%
Other	4,113	21.60%
IMail (6,027 servers)
Version	Number of Servers	Percent
8.22	1,005	16.67%
12.2.0.235	722	11.98%
12.3.0.100	642	10.65%
11.5	462	7.67%
9.23	362	6.01%
8.15	347	5.76%
11.03	242	4.02%
8.05	234	3.88%
12.2.0.169	199	3.30%
10.02	188	3.12%
12.1.0.270	158	2.62%
11.02	131	2.17%
7.07	128	2.12%
7.15	105	1.74%
6.06	105	1.74%
8.00	93	1.54%
10.01	84	1.39%
11.0	81	1.34%
11.01	78	1.29%
9.21	63	1.05%
Other	598	9.92%
Lotus Domino (3,645 servers)
Version	Number of Servers	Percent
8.5.3	640	17.56%
8.5.3FP3	264	7.24%
8.5.3FP2	197	5.40%
8.5.3FP4	196	5.38%
8.5.2	190	5.21%
8.5.2FP2	152	4.17%
8.5.1	145	3.98%
7.0.2	131	3.59%
8.5.3FP1	128	3.51%
8.5	116	3.18%
8.5.2FP3	115	3.16%
8.5.2FP4	83	2.28%
7.0.3	76	2.09%
8.5.1FP5	74	2.03%
8.5.2FP1	67	1.84%
7.0	63	1.73%
8.0.1	61	1.67%
6.5.4	54	1.48%
6.5.1	54	1.48%
8.0.2	52	1.43%
6.5.3	51	1.40%
7.0.1	49	1.34%
6.5.5	43	1.18%
8.0	41	1.12%
6.5	38	1.04%
Other	565	15.50%
CommuniGate Pro (2,804 servers)
Version	Number of Servers	Percent
5.1.16	268	9.56%
6.0.5	231	8.24%
4.1.8	105	3.74%
5.2.20	99	3.53%
5.4.10	80	2.85%
6.0.4	74	2.64%
5.3.13	74	2.64%
5.4.4	73	2.60%
5.4.8	72	2.57%
6.0.1	72	2.57%
5.4.6	66	2.35%
4.2.10	61	2.18%
5.3.15	60	2.14%
5.2.19	56	2.00%
5.4.1	55	1.96%
5.1.12	52	1.85%
5.2.3	51	1.82%
5.0.14	50	1.78%
5.2.16	49	1.75%
5.4.5	42	1.50%
5.4.9	40	1.43%
5.4.7	39	1.39%
5.4.3	36	1.28%
5.4.2	34	1.21%
5.4.0	31	1.11%
5.2.14	29	1.03%
Other	905	32.28%
WinWebMail (2,558 servers)
Version	Number of Servers	Percent
3.8.1.3	497	19.43%
3.8.0.1	301	11.77%
3.8.5.1	233	9.11%
3.7.6.1	233	9.11%
3.8.1.5	204	7.97%
3.8.1.1	182	7.11%
3.7.3.1	165	6.45%
3.7.7.3	153	5.98%
3.8.2.1	134	5.24%
3.7.1.1	77	3.01%
3.7.5.1	69	2.70%
3.8.3.1	65	2.54%
3.8.3.3	59	2.31%
3.7.0.3	36	1.41%
3.7.0.5	30	1.17%
3.6.3.1	30	1.17%
3.7.0.7	27	1.06%
3.7.7.1	27	1.06%
Other	36	1.41%
XMail (1,831 servers)
Version	Number of Servers	Percent
1.27	556	30.37%
1.22	469	25.61%
1.25	278	15.18%
1.26	199	10.87%
1.24	119	6.50%
1.21	49	2.68%
1.23	37	2.02%
1.17	27	1.47%
1.20	23	1.26%
Other	74	4.04%
Qmail Toaster (1,430 servers)
Version	Number of Servers	Percent
1.3	1,362	95.24%
1.2	35	2.45%
Other	33	2.31%
Kerio (1,218 servers)
Version	Number of Servers	Percent
6.7.3	218	17.90%
6.6.2	119	9.77%
6.7.0	118	9.69%
6.5.0	98	8.05%
6.5.2	89	7.31%
6.7.2	75	6.16%
6.7.1	64	5.25%
6.4.1	62	5.09%
6.3.1	50	4.11%
6.6.1	41	3.37%
6.4.0	41	3.37%
6.5.1	36	2.96%
6.6.0	29	2.38%
6.4.2	26	2.13%
6.3.0	23	1.89%
6.0.10	17	1.40%
Other	112	9.20%
Merak (973 servers)
Version	Number of Servers	Percent
8.0.3	386	39.67%
8.9.1	106	10.89%
8.5.0	56	5.76%
8.3.8	49	5.04%
7.5.2	42	4.32%
7.4.5	41	4.21%
7.6.4	36	3.70%
7.6.1	18	1.85%
7.0.1	17	1.75%
7.4.2	15	1.54%
9.0.0	14	1.44%
7.6.0	13	1.34%
8.3.15	13	1.34%
8.9.0	12	1.23%
7.2.0	12	1.23%
6.1.0	11	1.13%
8.2.4	11	1.13%
6.2.1	11	1.13%
4.4.2	10	1.03%
Other	100	10.28%
SurgeSMTP (922 servers)
Version	Number of Servers	Percent
6.3c2-2	292	31.67%
6.4a-1	81	8.79%
6.1c-1	56	6.07%
5.3h2-2	56	6.07%
5.2a-1	54	5.86%
3.9e-1	36	3.90%
6.0a5-5	26	2.82%
3.8k4-4	22	2.39%
4.0u4-4	19	2.06%
4.2d2-2	17	1.84%
5.0e4-4	12	1.30%
6.0a4-4	11	1.19%
3.8i3-3	11	1.19%
4.2d4-4	10	1.08%
3.9h-18	10	1.08%
Other	209	22.67%
ArGoSoft (537 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	142	26.44%
1.8 (1.8.9.5)	67	12.48%
1.8 (1.8.9.3)	64	11.92%
1.8 (1.8.9.1)	61	11.36%
1.8 (1.8.8.7)	35	6.52%
1.8 (1.8.8.8)	28	5.21%
1.8 (1.8.9.2)	23	4.28%
1.8 (1.8.9.4)	15	2.79%
1.8 (1.8.8.9)	11	2.05%
1.8 (1.8.6.0)	8	1.49%
1.8 (1.8.7.3)	6	1.12%
1.8 (1.8.8.1)	6	1.12%
Other	71	13.22%
GroupWise (365 servers)
Version	Number of Servers	Percent
7.0.3	64	17.53%
8.0.2	52	14.25%
6.5.7	44	12.05%
7.0.4	32	8.77%
7.0.2	26	7.12%
8.0.3	20	5.48%
6.5.6	16	4.38%
6.5.4	16	4.38%
7.0.1	13	3.56%
12.0.2	12	3.29%
6.0.4	10	2.74%
8.0.1	9	2.47%
6.5.1	7	1.92%
8.0.0	7	1.92%
12.0.0	6	1.64%
12.0.1	6	1.64%
7.0	5	1.37%
6.5.5	5	1.37%
6.5.2	4	1.10%
Other	11	3.01%
MagicMail (290 servers)
Version	Number of Servers	Percent
Other	290	100.00%
Gordano Messaging Suite (GMS) (278 servers)
Version	Number of Servers	Percent
Other	278	100.00%
Post.Office (273 servers)
Version	Number of Servers	Percent
3.5.3	41	15.02%
4.1.0.2	23	8.42%
4.1.2.4	23	8.42%
4.0.1	15	5.49%
3.5.3J	11	4.03%
4.1.1	11	4.03%
4.2.2	10	3.66%
4.2	10	3.66%
3.1.2	8	2.93%
4.1.0.3	8	2.93%
3.1.2J	7	2.56%
3.9.2.3	7	2.56%
3.8.3	7	2.56%
3.9.2	6	2.20%
4.2.1.3	6	2.20%
4.1.0.4	6	2.20%
3.5.4	4	1.47%
4.0.1.1	4	1.47%
3.6.2	4	1.47%
3.8.7.4	4	1.47%
3.9.2.2	4	1.47%
3.5.1	4	1.47%
4.2.1.1	4	1.47%
4.1	3	1.10%
3.9.1.3	3	1.10%
4.1.2.3	3	1.10%
3.9.2.1	3	1.10%
3.9.1.2	3	1.10%
4.2.1.2	3	1.10%
3.9.1	3	1.10%
4.1.2.2	3	1.10%
4.2.1	3	1.10%
Other	19	6.96%
Trend Micro (228 servers)
Version	Number of Servers	Percent
5.7	91	39.91%
5.5	52	22.81%
5.18	30	13.16%
7.0	26	11.40%
7.1	18	7.89%
Other	11	4.82%
Mirapoint (111 servers)
Version	Number of Servers	Percent
3.10.10a-GA	15	13.51%
4.3.5-GA	12	10.81%
4.2.3-GA	10	9.01%
4.3.6-GA	9	8.11%
4.1.10-GA	8	7.21%
3.10.9-GA	7	6.31%
4.4.2a-FCS	6	5.41%
3.10.8-GA	4	3.60%
4.1.9-GA	4	3.60%
4.1.3-GA	3	2.70%
4.3.3-GA	3	2.70%
4.2.4-GA	3	2.70%
4.1.5-GA	3	2.70%
3.7.5a-GA	2	1.80%
3.8.4-GA	2	1.80%
3.10.3-GA	2	1.80%
4.3.7-GA	2	1.80%
3.8.5-GA	2	1.80%
4.0.5a	2	1.80%
4.1.8-GA	2	1.80%
Other	10	9.01%
InterScan VirusWall (92 servers)
Version	Number of Servers	Percent
Other	92	100.00%
VisNetic (91 servers)
Version	Number of Servers	Percent
9.3.2.0	25	27.47%
9.1.4.1	11	12.09%
5.5.8.3	6	6.59%
8.0.3.1	4	4.40%
5.0.2.3	4	4.40%
7.6.1.0	4	4.40%
8.5.0.8	4	4.40%
5.8.6.6	3	3.30%
8.0.3	3	3.30%
8.0.3.0	3	3.30%
9.1.4.0	3	3.30%
7.2.4.1	3	3.30%
6.2.2.0	2	2.20%
5.4.5.4	2	2.20%
5.8.6.4	2	2.20%
5.3.5.0	2	2.20%
8.3.5.0	1	1.10%
5.0.2.0	1	1.10%
7-6-1-0	1	1.10%
8.3.0.1	1	1.10%
8.3.0.0	1	1.10%
8.5.0.5	1	1.10%
9.1.4.1 da-lax-msg mail.davidco.com	1	1.10%
6.0.9.0	1	1.10%
7.5.3.0	1	1.10%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.10%
Other	0	0.00%
OpenSMTPD (40 servers)
Version	Number of Servers	Percent
Other	40	100.00%
Mercury (38 servers)
Version	Number of Servers	Percent
1.48	18	47.37%
3.32	14	36.84%
1.47	2	5.26%
3.21c	2	5.26%
3.21	1	2.63%
4.x	1	2.63%
Other	0	0.00%
Interscan (29 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	7	24.14%
3.81-Build_1022	6	20.69%
3.55 (build 1029)	5	17.24%
3.81-Build_1084	3	10.34%
3.5 (build 1294)	1	3.45%
3.8-Build_3013	1	3.45%
3.81-Build_1055	1	3.45%
3.51 (build 1337)	1	3.45%
3.53 (build 2013)	1	3.45%
3.53 (build 2017)	1	3.45%
3.8-Build_3045	1	3.45%
3.8-Build_1080	1	3.45%
Other	0	0.00%
NetIQ MailMarshal (21 servers)
Version	Number of Servers	Percent
6.0.3.8	13	61.90%
5.5.6.7	3	14.29%
5.5.6.5	2	9.52%
5.5.5.6	1	4.76%
5.5.4.17	1	4.76%
5.5.6.6	1	4.76%
Other	0	0.00%
WebSTAR V (21 servers)
Version	Number of Servers	Percent
5.4.1	10	47.62%
5.4.0	5	23.81%
5.3.4	3	14.29%
5.3.2	2	9.52%
5.3.3	1	4.76%
Other	0	0.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	9	47.37%
8.4	5	26.32%
7.3	4	21.05%
8.2	1	5.26%
Other	0	0.00%
Neon Mail Server (16 servers)
Version	Number of Servers	Percent
3.0.7	5	31.25%
3.1.4	3	18.75%
3.1.2	2	12.50%
3.1.0	2	12.50%
3.1.3	1	6.25%
3.0.9	1	6.25%
3.1.5	1	6.25%
3.0.6	1	6.25%
Other	0	0.00%
WebSTAR (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
MessageWall (11 servers)
Version	Number of Servers	Percent
1.0.8	11	100.00%
Other	0	0.00%
ModusMail (8 servers)
Version	Number of Servers	Percent
4.35.477.0	4	50.00%
4.1.361.21	1	12.50%
3.2.315.0	1	12.50%
4.35.477.8	1	12.50%
3.1.302.0	1	12.50%
Other	0	0.00%
MAILsweeper (3 servers)
Version	Number of Servers	Percent
4.3.17.0	2	66.67%
4.3.20.0	1	33.33%
Other	0	0.00%