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	2,480,200	100.0%
Number of Servers that didn't respond	437,983	17.66%
Server didn't open socket	426,145	17.18%
Server didn't provide banner	11,838	0.48%
Server provided banner	2,042,217	82.34%
Server banner identifies software in use	1,133,399	45.70%

As indicated by the above table, of the 2,480,200 servers queried, only 1,133,399 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	562,145	49.60%
Postfix	314,512	27.75%
Sendmail	108,659	9.59%
Microsoft	70,067	6.18%
MailEnable	32,642	2.88%
MDaemon	20,396	1.80%
IMail	6,215	0.55%
Lotus Domino	3,894	0.34%
CommuniGate Pro	2,992	0.26%
WinWebMail	2,849	0.25%
XMail	1,990	0.18%
Kerio	1,263	0.11%
Qmail Toaster	1,249	0.11%
Merak	973	0.09%
SurgeSMTP	953	0.08%
ArGoSoft	578	0.05%
Post.Office	324	0.03%
GroupWise	320	0.03%
MagicMail	293	0.03%
Gordano Messaging Suite (GMS)	270	0.02%
Trend Micro	255	0.02%
InterScan VirusWall	109	0.01%
Mirapoint	105	0.01%
VisNetic	90	0.01%
OpenSMTPD	63	0.01%
Mercury	44	0.00%
Interscan	32	0.00%
NetIQ MailMarshal	22	0.00%
WebSTAR V	22	0.00%
OpenVMS	20	0.00%
Neon Mail Server	18	0.00%
WebSTAR	11	0.00%
MessageWall	11	0.00%
ModusMail	9	0.00%
MAILsweeper	4	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (562,145 servers)
Version	Number of Servers	Percent
4.80.1	332,738	59.19%
4.80	140,444	24.98%
4.72	21,639	3.85%
4.76	17,186	3.06%
4.69	16,230	2.89%
4.77	12,678	2.26%
Other	21,230	3.78%
Postfix (314,512 servers)
Version	Number of Servers	Percent
Other	314,512	100.00%
Sendmail (108,659 servers)
Version	Number of Servers	Percent
8.13.8	27,913	25.69%
8.13.1	15,083	13.88%
8.14.3	14,649	13.48%
8.14.4	14,393	13.25%
8.14.5	13,536	12.46%
8.12.11.20060308	3,646	3.36%
8.13.6.20060614	3,041	2.80%
8.14.2	2,387	2.20%
8.11.6	1,630	1.50%
8.12.10	1,498	1.38%
8.14.1	1,392	1.28%
8.14.7	1,301	1.20%
8.13.6	1,195	1.10%
Other	6,995	6.44%
Microsoft (70,067 servers)
Version	Number of Servers	Percent
6.0.3790.4675	56,395	80.49%
6.0.3790.3959	6,693	9.55%
7.5.7601.17514	2,156	3.08%
6.0.3790.1830	1,774	2.53%
Other	3,049	4.35%
MailEnable (32,642 servers)
Version	Number of Servers	Percent
1.986--	4,423	13.55%
6.5--	2,388	7.32%
5.10--	2,013	6.17%
4.26--	1,530	4.69%
6.0--	1,290	3.95%
7.06--	865	2.65%
1.981--	845	2.59%
7.50--	652	2.00%
7.07--	617	1.89%
7.0--	574	1.76%
7.09--	559	1.71%
6.70--	556	1.70%
6.57--	516	1.58%
6.03--	511	1.57%
3.62--	482	1.48%
1.983--	472	1.45%
0-6.83-	417	1.28%
5.51--	389	1.19%
0-3.65-	360	1.10%
Other	13,183	40.39%
MDaemon (20,396 servers)
Version	Number of Servers	Percent
13.5.2	2,922	14.33%
11.0.3	1,512	7.41%
13.0.5	1,288	6.31%
13.0.4	1,266	6.21%
11.0.0	1,218	5.97%
13.5.1	945	4.63%
13.0.3	775	3.80%
10.0.0	666	3.27%
12.5.6	620	3.04%
10.1.2	534	2.62%
10.1.1	530	2.60%
13.0.2	455	2.23%
12.5.4	395	1.94%
9.6.1	384	1.88%
9.6.6	360	1.77%
10.1.0	350	1.72%
9.6.2	276	1.35%
13.5.0	252	1.24%
9.5.2	242	1.19%
12.5.8	221	1.08%
12.0.3	220	1.08%
10.0.5	213	1.04%
10.0.2	211	1.03%
Other	4,541	22.26%
IMail (6,215 servers)
Version	Number of Servers	Percent
8.22	1,010	16.25%
12.3.0.100	820	13.19%
12.2.0.235	686	11.04%
11.5	444	7.14%
8.15	352	5.66%
9.23	347	5.58%
11.03	252	4.05%
8.05	243	3.91%
10.02	201	3.23%
12.1.0.270	172	2.77%
11.01	148	2.38%
11.02	135	2.17%
7.07	130	2.09%
12.2.0.169	116	1.87%
7.15	108	1.74%
8.00	103	1.66%
6.06	96	1.54%
10.01	94	1.51%
11.0	69	1.11%
9.21	63	1.01%
Other	626	10.07%
Lotus Domino (3,894 servers)
Version	Number of Servers	Percent
8.5.3	649	16.67%
8.5.3FP3	260	6.68%
8.5.2	206	5.29%
8.5.3FP4	195	5.01%
8.5.3FP2	190	4.88%
8.5.1	161	4.13%
8.5.2FP2	152	3.90%
7.0.2	145	3.72%
8.5.3FP1	138	3.54%
8.5	118	3.03%
8.5.2FP3	111	2.85%
8.5.2FP4	96	2.47%
8.5.3FP5	85	2.18%
7.0.3	75	1.93%
8.5.1FP5	72	1.85%
8.5.2FP1	66	1.69%
8.0.1	65	1.67%
7.0	64	1.64%
8.0.2	60	1.54%
6.5.3	59	1.52%
6.5.4	56	1.44%
6.5.1	56	1.44%
7.0.1	54	1.39%
6.5.5	45	1.16%
8.0	45	1.16%
Other	671	17.23%
CommuniGate Pro (2,992 servers)
Version	Number of Servers	Percent
5.1.16	270	9.02%
6.0.5	148	4.95%
6.0.7	98	3.28%
5.2.20	97	3.24%
4.1.8	88	2.94%
5.4.10	76	2.54%
6.0.6	68	2.27%
6.0.1	63	2.11%
5.3.13	59	1.97%
5.4.8	56	1.87%
5.4.6	56	1.87%
5.4.4	56	1.87%
5.1.12	54	1.80%
4.2.10	52	1.74%
5.0.14	47	1.57%
6.0.4	46	1.54%
5.2.19	46	1.54%
5.2.3	43	1.44%
5.4.1	42	1.40%
5.2.16	42	1.40%
5.4.5	41	1.37%
5.3.15	38	1.27%
5.4.2	32	1.07%
5.4.7	32	1.07%
5.4.9	31	1.04%
5.4.0	30	1.00%
Other	1,281	42.81%
WinWebMail (2,849 servers)
Version	Number of Servers	Percent
3.8.1.3	539	18.92%
3.8.0.1	324	11.37%
3.7.6.1	266	9.34%
3.8.5.1	244	8.56%
3.8.1.5	226	7.93%
3.8.1.1	190	6.67%
3.7.3.1	172	6.04%
3.7.7.3	155	5.44%
3.8.2.1	142	4.98%
3.8.6.1	107	3.76%
3.7.1.1	89	3.12%
3.7.5.1	75	2.63%
3.8.3.1	70	2.46%
3.8.3.3	59	2.07%
3.7.0.5	38	1.33%
3.7.0.3	36	1.26%
3.6.3.1	35	1.23%
Other	82	2.88%
XMail (1,990 servers)
Version	Number of Servers	Percent
1.27	631	31.71%
1.22	498	25.03%
1.25	297	14.92%
1.26	204	10.25%
1.24	127	6.38%
1.21	61	3.07%
1.23	39	1.96%
1.17	31	1.56%
1.20	23	1.16%
Other	79	3.97%
Kerio (1,263 servers)
Version	Number of Servers	Percent
6.7.3	221	17.50%
6.7.0	127	10.06%
6.6.2	123	9.74%
6.5.0	99	7.84%
6.5.2	87	6.89%
6.7.2	78	6.18%
6.4.1	70	5.54%
6.7.1	63	4.99%
6.3.1	54	4.28%
6.6.1	49	3.88%
6.4.0	43	3.40%
6.5.1	40	3.17%
6.4.2	29	2.30%
6.6.0	27	2.14%
6.3.0	26	2.06%
6.0.10	19	1.50%
6.2.0	13	1.03%
Other	95	7.52%
Qmail Toaster (1,249 servers)
Version	Number of Servers	Percent
1.3	1,181	94.56%
1.2	36	2.88%
Other	32	2.56%
Merak (973 servers)
Version	Number of Servers	Percent
8.0.3	367	37.72%
8.9.1	113	11.61%
8.5.0	67	6.89%
8.3.8	48	4.93%
7.5.2	46	4.73%
7.6.4	39	4.01%
7.4.5	38	3.91%
7.4.2	17	1.75%
7.0.1	16	1.64%
7.6.1	16	1.64%
7.2.0	14	1.44%
9.0.0	14	1.44%
8.3.15	14	1.44%
7.6.0	13	1.34%
8.9.0	12	1.23%
6.2.1	11	1.13%
4.4.2	11	1.13%
8.2.4	10	1.03%
Other	107	11.00%
SurgeSMTP (953 servers)
Version	Number of Servers	Percent
6.3c2-2	240	25.18%
6.4a-1	170	17.84%
5.3h2-2	55	5.77%
5.2a-1	55	5.77%
6.1c-1	53	5.56%
3.9e-1	34	3.57%
6.0a5-5	24	2.52%
3.8k4-4	18	1.89%
4.0u4-4	18	1.89%
5.0e4-4	15	1.57%
6.5a-1	14	1.47%
6.5b-7	13	1.36%
6.0a4-4	12	1.26%
4.2d2-2	12	1.26%
4.3g2-2	11	1.15%
Other	209	21.93%
ArGoSoft (578 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	145	25.09%
1.8 (1.8.9.5)	82	14.19%
1.8 (1.8.9.3)	73	12.63%
1.8 (1.8.9.1)	60	10.38%
1.8 (1.8.8.7)	38	6.57%
1.8 (1.8.8.8)	32	5.54%
1.8 (1.8.9.2)	21	3.63%
1.8 (1.8.9.4)	18	3.11%
1.8 (1.8.8.9)	11	1.90%
1.8 (1.8.6.0)	10	1.73%
1.8 (1.8.7.3)	7	1.21%
1.8 (1.8.8.1)	6	1.04%
Other	75	12.98%
Post.Office (324 servers)
Version	Number of Servers	Percent
3.5.3	42	12.96%
4.1.2.4	33	10.19%
4.1.0.2	27	8.33%
4.0.1	18	5.56%
4.1.1	15	4.63%
4.2.2	15	4.63%
3.5.3J	12	3.70%
3.9.2.3	12	3.70%
4.2	12	3.70%
4.1.0.3	9	2.78%
3.8.3	8	2.47%
4.1.0.4	8	2.47%
3.1.2	7	2.16%
3.9.2	7	2.16%
3.1.2J	7	2.16%
4.2.1.3	6	1.85%
3.9.1	6	1.85%
3.9.1.2	5	1.54%
4.0.1.1	5	1.54%
4.1.2.3	5	1.54%
3.6.2	5	1.54%
4.2.1.1	5	1.54%
3.5.4	4	1.23%
4.1	4	1.23%
3.9.1.3	4	1.23%
3.9.2.2	4	1.23%
3.5.1	4	1.23%
Other	35	10.80%
GroupWise (320 servers)
Version	Number of Servers	Percent
7.0.3	54	16.88%
8.0.2	48	15.00%
6.5.7	38	11.88%
7.0.4	24	7.50%
8.0.3	23	7.19%
7.0.2	21	6.56%
6.5.4	15	4.69%
12.0.2	13	4.06%
6.5.6	13	4.06%
7.0.1	10	3.12%
12.0.1	9	2.81%
6.0.4	9	2.81%
6.5.1	6	1.88%
12.0.0	5	1.56%
8.0.1	5	1.56%
8.0.0	5	1.56%
7.0	4	1.25%
6.5.5	4	1.25%
Other	14	4.38%
MagicMail (293 servers)
Version	Number of Servers	Percent
Other	293	100.00%
Gordano Messaging Suite (GMS) (270 servers)
Version	Number of Servers	Percent
Other	270	100.00%
Trend Micro (255 servers)
Version	Number of Servers	Percent
5.7	101	39.61%
5.5	57	22.35%
5.18	42	16.47%
7.0	26	10.20%
7.1	17	6.67%
3.53	3	1.18%
Other	9	3.53%
InterScan VirusWall (109 servers)
Version	Number of Servers	Percent
Other	109	100.00%
Mirapoint (105 servers)
Version	Number of Servers	Percent
4.3.5-GA	16	15.24%
3.10.10a-GA	14	13.33%
4.3.6-GA	10	9.52%
4.2.3-GA	8	7.62%
4.4.2a-FCS	6	5.71%
4.1.10-GA	6	5.71%
3.10.9-GA	5	4.76%
3.10.8-GA	4	3.81%
4.2.4-GA	4	3.81%
4.1.9-GA	3	2.86%
4.1.5-GA	3	2.86%
4.1.3-GA	2	1.90%
3.8.4-GA	2	1.90%
4.3.3-GA	2	1.90%
3.10.3-GA	2	1.90%
4.4.3-GA	2	1.90%
4.3.7-GA	2	1.90%
3.8.3-GA	2	1.90%
3.8.5-GA	2	1.90%
Other	10	9.52%
VisNetic (90 servers)
Version	Number of Servers	Percent
9.3.2.0	24	26.67%
9.1.4.1	10	11.11%
5.5.8.3	7	7.78%
8.0.3.1	6	6.67%
7.6.1.0	4	4.44%
6.2.2.0	4	4.44%
8.5.0.8	4	4.44%
5.0.2.3	3	3.33%
8.0.3.0	3	3.33%
9.1.4.0	3	3.33%
7.2.4.1	3	3.33%
5.8.6.6	3	3.33%
5.4.5.4	2	2.22%
5.8.6.4	2	2.22%
5.3.5.0	2	2.22%
8.3.5.0	1	1.11%
5.0.2.0	1	1.11%
8.0.3	1	1.11%
8.3.0.1	1	1.11%
8.3.0.0	1	1.11%
8.5.0.5	1	1.11%
9.1.4.1 da-lax-msg mail.davidco.com	1	1.11%
6.0.9.0	1	1.11%
7.5.3.0	1	1.11%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.11%
Other	0	0.00%
OpenSMTPD (63 servers)
Version	Number of Servers	Percent
Other	63	100.00%
Mercury (44 servers)
Version	Number of Servers	Percent
1.48	24	54.55%
3.32	13	29.55%
3.21c	3	6.82%
1.47	2	4.55%
3.21	1	2.27%
4.x	1	2.27%
Other	0	0.00%
Interscan (32 servers)
Version	Number of Servers	Percent
3.81-Build_1022	6	18.75%
3.55 (build 1016)	6	18.75%
3.55 (build 1029)	5	15.62%
3.81-Build_1084	3	9.38%
3.8-Build_3013	2	6.25%
3.53 (build 2011)	2	6.25%
3.5 (build 1294)	1	3.12%
3.55 (build 1020)	1	3.12%
3.51 (build 1337)	1	3.12%
3.53 (build 2013)	1	3.12%
3.53 (build 2017)	1	3.12%
3.53 (build 1493)	1	3.12%
3.8-Build_3045	1	3.12%
3.8-Build_1080	1	3.12%
Other	0	0.00%
NetIQ MailMarshal (22 servers)
Version	Number of Servers	Percent
6.0.3.8	13	59.09%
5.5.6.5	2	9.09%
5.5.6.7	2	9.09%
5.5.6.6	2	9.09%
5.5.5.6	1	4.55%
5.5.4.17	1	4.55%
6.1.3.15	1	4.55%
Other	0	0.00%
WebSTAR V (22 servers)
Version	Number of Servers	Percent
5.4.1	11	50.00%
5.4.0	5	22.73%
5.3.4	3	13.64%
5.3.2	2	9.09%
5.3.3	1	4.55%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	9	45.00%
8.4	6	30.00%
7.3	4	20.00%
8.2	1	5.00%
Other	0	0.00%
Neon Mail Server (18 servers)
Version	Number of Servers	Percent
3.0.7	5	27.78%
3.1.2	3	16.67%
3.1.4	2	11.11%
3.0.9	2	11.11%
3.1.0	2	11.11%
3.1.5	2	11.11%
3.1.3	1	5.56%
3.0.6	1	5.56%
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	10	90.91%
1.0.6	1	9.09%
Other	0	0.00%
ModusMail (9 servers)
Version	Number of Servers	Percent
4.35.477.0	6	66.67%
4.1.361.21	1	11.11%
4.35.477.8	1	11.11%
3.1.302.0	1	11.11%
Other	0	0.00%
MAILsweeper (4 servers)
Version	Number of Servers	Percent
4.3.17.0	2	50.00%
4.3.19.0	1	25.00%
4.3.20.0	1	25.00%
Other	0	0.00%