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	2,383,827	100.0%
Number of Servers that didn't respond	442,356	18.56%
Server didn't open socket	432,553	18.15%
Server didn't provide banner	9,803	0.41%
Server provided banner	1,941,471	81.44%
Server banner identifies software in use	1,139,757	47.81%

As indicated by the above table, of the 2,383,827 servers queried, only 1,139,757 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	606,586	53.22%
Postfix	371,882	32.63%
Sendmail	75,909	6.66%
MailEnable	28,511	2.50%
Microsoft	23,445	2.06%
MDaemon	17,167	1.51%
IMail	3,616	0.32%
CommuniGate Pro	2,401	0.21%
Lotus Domino	2,070	0.18%
WinWebMail	1,685	0.15%
XMail	1,488	0.13%
Qmail Toaster	1,114	0.10%
SurgeSMTP	814	0.07%
Kerio	747	0.07%
Merak	485	0.04%
ArGoSoft	353	0.03%
OpenSMTPD	277	0.02%
MagicMail	250	0.02%
Post.Office	223	0.02%
GroupWise	195	0.02%
Gordano Messaging Suite (GMS)	183	0.02%
Trend Micro	115	0.01%
InterScan VirusWall	62	0.01%
VisNetic	44	0.00%
Mirapoint	40	0.00%
OpenVMS	20	0.00%
Mercury	19	0.00%
WebSTAR V	13	0.00%
Interscan	12	0.00%
ModusMail	11	0.00%
Neon Mail Server	7	0.00%
MessageWall	7	0.00%
NetIQ MailMarshal	3	0.00%
WebSTAR	2	0.00%
MAILsweeper	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (606,586 servers)
Version	Number of Servers	Percent
4.86	323,354	53.31%
4.85	118,133	19.48%
4.84	62,851	10.36%
4.72	17,416	2.87%
4.80	17,361	2.86%
4.82	17,187	2.83%
4.80.1	15,707	2.59%
4.76	14,319	2.36%
Other	20,258	3.34%
Postfix (371,882 servers)
Version	Number of Servers	Percent
Other	371,882	100.00%
Sendmail (75,909 servers)
Version	Number of Servers	Percent
8.14.5	16,924	22.30%
8.13.8	14,935	19.67%
8.14.4	14,470	19.06%
8.13.1	9,055	11.93%
8.14.3	4,981	6.56%
8.14.9	1,887	2.49%
8.14.7	1,814	2.39%
8.12.11.20060308	1,678	2.21%
8.13.6.20060614	1,083	1.43%
8.14.2	930	1.23%
8.15.2	917	1.21%
8.12.10	767	1.01%
Other	6,468	8.52%
MailEnable (28,511 servers)
Version	Number of Servers	Percent
8.60--	2,595	9.10%
6.5--	1,774	6.22%
1.986--	1,610	5.65%
8.53--	1,568	5.50%
8.51--	1,114	3.91%
5.10--	877	3.08%
9.00--	876	3.07%
8.04--	833	2.92%
8.60-8.60-	810	2.84%
8.50--	633	2.22%
4.26--	630	2.21%
8.00--	615	2.16%
6.0--	583	2.04%
7.06--	572	2.01%
9.00--9.00	429	1.50%
8.60--8.60	426	1.49%
7.07--	366	1.28%
8.55--	364	1.28%
7.0--	357	1.25%
9.00-9.00-	357	1.25%
7.50--	340	1.19%
6.57--	339	1.19%
6.88-6.88-	319	1.12%
6.70--	313	1.10%
7.53--	296	1.04%
1.981--	295	1.03%
Other	9,220	32.34%
Microsoft (23,445 servers)
Version	Number of Servers	Percent
6.0.3790.4675	16,890	72.04%
6.0.3790.3959	1,889	8.06%
7.5.7601.17514	1,770	7.55%
6.0.3790.1830	537	2.29%
8.5.9600.16384	521	2.22%
7.0.6002.18264	413	1.76%
8.0.9200.16384	286	1.22%
5.0.2195.7381	276	1.18%
Other	863	3.68%
MDaemon (17,167 servers)
Version	Number of Servers	Percent
15.0.3	1,593	9.28%
15.5.2	1,337	7.79%
15.5.1	1,131	6.59%
11.0.3	852	4.96%
11.0.0	756	4.40%
13.5.1	726	4.23%
13.0.4	673	3.92%
13.0.5	672	3.91%
15.5.0	484	2.82%
13.6.3	390	2.27%
12.5.6	377	2.20%
10.0.0	369	2.15%
14.5.2	362	2.11%
12.5.4	310	1.81%
10.1.2	308	1.79%
14.0.3	281	1.64%
14.5.3	271	1.58%
15.0.1	252	1.47%
10.1.1	247	1.44%
10.1.0	204	1.19%
9.6.1	201	1.17%
14.0.2	201	1.17%
13.0.2	194	1.13%
13.6.2	191	1.11%
9.6.6	185	1.08%
Other	4,600	26.80%
IMail (3,616 servers)
Version	Number of Servers	Percent
8.22	400	11.06%
12.5.3.93	361	9.98%
12.4.2.27	274	7.58%
12.3.0.100	270	7.47%
9.23	242	6.69%
12.4.1.15	190	5.25%
8.15	175	4.84%
8.05	146	4.04%
12.5.3.99	145	4.01%
12.2.0.235	115	3.18%
11.5	107	2.96%
11.03	104	2.88%
12.5.2.62	95	2.63%
12.5.1.60	77	2.13%
10.02	60	1.66%
11.02	59	1.63%
7.07	57	1.58%
12.4.1.9	56	1.55%
12.5.0.246	55	1.52%
7.15	50	1.38%
11.01	47	1.30%
12.1.0.270	46	1.27%
8.00	43	1.19%
Other	442	12.22%
CommuniGate Pro (2,401 servers)
Version	Number of Servers	Percent
5.1.16	251	10.45%
6.0.11	136	5.66%
6.0.9	119	4.96%
6.1.5	103	4.29%
6.1.6	96	4.00%
6.1.2	91	3.79%
5.4.11	83	3.46%
5.2.20	80	3.33%
6.0.10	71	2.96%
6.1.7	60	2.50%
6.0.7	53	2.21%
5.3.13	53	2.21%
4.1.8	51	2.12%
5.3.15	51	2.12%
5.2.3	48	2.00%
5.0.14	46	1.92%
6.1.4	41	1.71%
6.0.5	39	1.62%
6.0.8	37	1.54%
5.2.16	29	1.21%
5.4.8	29	1.21%
5.4.6	26	1.08%
5.1.12	25	1.04%
Other	783	32.61%
Lotus Domino (2,070 servers)
Version	Number of Servers	Percent
8.5.3FP6	317	15.31%
8.5.3	288	13.91%
8.5.2	98	4.73%
8.5.1	75	3.62%
7.0.2	69	3.33%
8.5.3FP3	67	3.24%
8.5.3FP2	62	3.00%
8.5	62	3.00%
8.5.2FP4	62	3.00%
8.5.3FP4	50	2.42%
8.5.2FP3	50	2.42%
8.5.3FP1	48	2.32%
8.5.3FP5	46	2.22%
8.5.2FP2	43	2.08%
7.0.3	39	1.88%
8.5.1FP5	36	1.74%
7.0	32	1.55%
8.0.1	32	1.55%
7.0.1	31	1.50%
8.0	29	1.40%
6.5.1	27	1.30%
8.0.2	26	1.26%
8.5.2FP1	23	1.11%
6.5.4	21	1.01%
6.5	21	1.01%
7.0.4	21	1.01%
Other	395	19.08%
WinWebMail (1,685 servers)
Version	Number of Servers	Percent
3.9.0.7	299	17.74%
3.8.1.3	278	16.50%
3.7.6.1	133	7.89%
3.9.0.1	129	7.66%
3.8.0.1	116	6.88%
3.8.1.5	90	5.34%
3.8.1.1	88	5.22%
3.7.3.1	81	4.81%
3.8.5.1	78	4.63%
3.7.7.3	59	3.50%
3.8.6.1	58	3.44%
3.7.1.1	46	2.73%
3.8.2.1	42	2.49%
3.8.3.1	25	1.48%
3.7.5.1	25	1.48%
3.8.3.3	22	1.31%
3.7.0.5	20	1.19%
3.7.0.3	18	1.07%
Other	78	4.63%
XMail (1,488 servers)
Version	Number of Servers	Percent
1.27	578	38.84%
1.22	429	28.83%
1.25	169	11.36%
1.26	123	8.27%
1.24	65	4.37%
1.21	35	2.35%
1.23	20	1.34%
1.20	16	1.08%
Other	53	3.56%
Qmail Toaster (1,114 servers)
Version	Number of Servers	Percent
1.3	1,044	93.72%
1.2	19	1.71%
1.03.5	15	1.35%
Other	36	3.23%
SurgeSMTP (814 servers)
Version	Number of Servers	Percent
6.9c-1	138	16.95%
6.5a2-2	99	12.16%
7.0c2-2	85	10.44%
6.7c-1	70	8.60%
6.5a-1	37	4.55%
6.3c2-2	30	3.69%
5.2a-1	21	2.58%
3.9e-1	19	2.33%
3.8k4-4	17	2.09%
6.4a-1	17	2.09%
6.9d-29	15	1.84%
5.3h2-2	15	1.84%
7.1a-1	12	1.47%
7.0c-1	12	1.47%
7.1b-6	12	1.47%
4.0u4-4	10	1.23%
6.1c-1	9	1.11%
Other	196	24.08%
Kerio (747 servers)
Version	Number of Servers	Percent
6.7.3	152	20.35%
6.7.0	76	10.17%
6.6.2	60	8.03%
6.5.2	56	7.50%
6.5.0	49	6.56%
6.7.2	42	5.62%
6.4.1	41	5.49%
6.6.1	39	5.22%
6.7.1	34	4.55%
6.3.1	31	4.15%
6.5.1	29	3.88%
6.3.0	19	2.54%
6.4.0	17	2.28%
6.4.2	15	2.01%
6.6.0	13	1.74%
6.1.3	10	1.34%
6.2.0	8	1.07%
Other	56	7.50%
Merak (485 servers)
Version	Number of Servers	Percent
8.0.3	156	32.16%
8.9.1	68	14.02%
8.5.0	37	7.63%
8.3.8	26	5.36%
7.5.2	26	5.36%
7.4.5	24	4.95%
7.6.4	18	3.71%
7.6.1	13	2.68%
7.0.1	12	2.47%
8.3.15	10	2.06%
7.2.0	9	1.86%
7.4.2	8	1.65%
8.9.0	7	1.44%
8.2.4	6	1.24%
6.2.1	5	1.03%
6.0.8	5	1.03%
Other	55	11.34%
ArGoSoft (353 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	106	30.03%
1.8 (1.8.9.3)	49	13.88%
1.8 (1.8.9.5)	43	12.18%
1.8 (1.8.9.1)	33	9.35%
1.8 (1.8.8.8)	20	5.67%
1.8 (1.8.8.7)	18	5.10%
1.8 (1.8.9.2)	12	3.40%
1.8 (1.8.6.0)	8	2.27%
1.8 (1.8.9.4)	7	1.98%
1.8 (1.8.7.3)	6	1.70%
1.8 (1.8.8.9)	5	1.42%
1.8 (1.8.9.0)	4	1.13%
Other	42	11.90%
OpenSMTPD (277 servers)
Version	Number of Servers	Percent
Other	277	100.00%
MagicMail (250 servers)
Version	Number of Servers	Percent
Other	250	100.00%
Post.Office (223 servers)
Version	Number of Servers	Percent
4.2.2	46	20.63%
3.5.3	31	13.90%
4.1.2.4	27	12.11%
4.3	21	9.42%
4.1.0.2	8	3.59%
4.1.1	8	3.59%
4.2.1.3	8	3.59%
4.0.1	7	3.14%
3.9.2.3	7	3.14%
4.2.1.1	7	3.14%
4.2	5	2.24%
3.1.2J	5	2.24%
3.5.3J	4	1.79%
3.8.7.4	4	1.79%
3.9.2	3	1.35%
4.1.2.3	3	1.35%
3.1.2	3	1.35%
3.5.1	3	1.35%
Other	23	10.31%
GroupWise (195 servers)
Version	Number of Servers	Percent
14.0.1	27	13.85%
14.0.2	24	12.31%
8.0.3	21	10.77%
7.0.3	19	9.74%
6.5.7	17	8.72%
8.0.2	12	6.15%
7.0.4	11	5.64%
7.0.2	9	4.62%
14.0.0	7	3.59%
12.0.2	6	3.08%
7.0.1	5	2.56%
6.5.6	4	2.05%
6.0.4	4	2.05%
6.5.4	3	1.54%
6.0.3	3	1.54%
14.2.0	3	1.54%
8.0.1	2	1.03%
12.0.4	2	1.03%
8.0.0	2	1.03%
6.5.5	2	1.03%
12.0.3	2	1.03%
12.0.1	2	1.03%
12.0.0	2	1.03%
6.0.2	2	1.03%
Other	4	2.05%
Gordano Messaging Suite (GMS) (183 servers)
Version	Number of Servers	Percent
Other	183	100.00%
Trend Micro (115 servers)
Version	Number of Servers	Percent
5.7	42	36.52%
5.5	23	20.00%
5.18	20	17.39%
7.0	10	8.70%
7.1	7	6.09%
8.5	4	3.48%
3.53	3	2.61%
7.5	2	1.74%
Other	4	3.48%
InterScan VirusWall (62 servers)
Version	Number of Servers	Percent
Other	62	100.00%
VisNetic (44 servers)
Version	Number of Servers	Percent
9.3.2.0	9	20.45%
6.2.2.0	4	9.09%
9.1.4.1	4	9.09%
5.0.2.3	3	6.82%
5.8.6.6	3	6.82%
8.5.0.8	3	6.82%
9.1.4.0	2	4.55%
7.2.4.1	2	4.55%
7.6.1.0	2	4.55%
5.5.8.3	2	4.55%
5.3.5.0	2	4.55%
8.0.3	1	2.27%
8.3.0.1	1	2.27%
8.5.0.5	1	2.27%
5.4.5.4	1	2.27%
8.0.3.1	1	2.27%
5.0.2.0	1	2.27%
7.2.4.0	1	2.27%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.27%
Other	0	0.00%
Mirapoint (40 servers)
Version	Number of Servers	Percent
4.4.3-GA	7	17.50%
4.3.6-GA	5	12.50%
4.4.2a-FCS	4	10.00%
4.3.5-GA	4	10.00%
4.4.5-GA	4	10.00%
4.3.3-GA	2	5.00%
3.10.10a-GA	2	5.00%
4.4.4-GA	2	5.00%
4.4.5a-GA	2	5.00%
4.1.10-GA	2	5.00%
4.1.9-GA	1	2.50%
4.1.6-GA	1	2.50%
3.7.5a-GA	1	2.50%
3.8.4-GA	1	2.50%
3.10.2-GA	1	2.50%
4.4.6-GA	1	2.50%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	9	45.00%
7.3	6	30.00%
8.4	5	25.00%
Other	0	0.00%
Mercury (19 servers)
Version	Number of Servers	Percent
3.32	10	52.63%
1.48	7	36.84%
3.21	1	5.26%
4.x	1	5.26%
Other	0	0.00%
WebSTAR V (13 servers)
Version	Number of Servers	Percent
5.4.1	6	46.15%
5.4.0	4	30.77%
5.3.3	1	7.69%
5.3.4	1	7.69%
5.3.2	1	7.69%
Other	0	0.00%
Interscan (12 servers)
Version	Number of Servers	Percent
3.81-Build_1084	2	16.67%
3.81-Build_1022	2	16.67%
3.55 (build 1029)	2	16.67%
3.5 (build 1294)	1	8.33%
3.8-Build_3013	1	8.33%
3.53 (build 2013)	1	8.33%
3.53 (build 2017)	1	8.33%
3.55 (build 1016)	1	8.33%
3.8-Build_1080	1	8.33%
Other	0	0.00%
ModusMail (11 servers)
Version	Number of Servers	Percent
4.35.477.0	6	54.55%
4.1.361.21	2	18.18%
3.2.315.0	1	9.09%
4.35.477.8	1	9.09%
3.1.302.0	1	9.09%
Other	0	0.00%
Neon Mail Server (7 servers)
Version	Number of Servers	Percent
3.0.7	3	42.86%
3.1.0	2	28.57%
3.1.4	1	14.29%
3.1.2	1	14.29%
Other	0	0.00%
MessageWall (7 servers)
Version	Number of Servers	Percent
1.0.8	7	100.00%
Other	0	0.00%
NetIQ MailMarshal (3 servers)
Version	Number of Servers	Percent
5.5.6.5	1	33.33%
5.5.4.17	1	33.33%
5.5.6.7	1	33.33%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
MAILsweeper (1 servers)
Version	Number of Servers	Percent
4.3.20.0	1	100.00%
Other	0	0.00%