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	2,294,826	100.0%
Number of Servers that didn't respond	423,690	18.46%
Server didn't open socket	415,057	18.09%
Server didn't provide banner	8,633	0.38%
Server provided banner	1,871,136	81.54%
Server banner identifies software in use	1,114,717	48.58%

As indicated by the above table, of the 2,294,826 servers queried, only 1,114,717 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	604,931	54.27%
Postfix	364,470	32.70%
Sendmail	67,479	6.05%
MailEnable	27,362	2.45%
Microsoft	19,555	1.75%
MDaemon	16,039	1.44%
IMail	3,329	0.30%
CommuniGate Pro	2,187	0.20%
Lotus Domino	1,779	0.16%
WinWebMail	1,602	0.14%
XMail	1,366	0.12%
Qmail Toaster	1,067	0.10%
SurgeSMTP	798	0.07%
Kerio	673	0.06%
Merak	432	0.04%
ArGoSoft	302	0.03%
OpenSMTPD	261	0.02%
MagicMail	238	0.02%
Post.Office	204	0.02%
Gordano Messaging Suite (GMS)	173	0.02%
GroupWise	164	0.01%
Trend Micro	102	0.01%
InterScan VirusWall	55	0.00%
Mirapoint	38	0.00%
VisNetic	34	0.00%
OpenVMS	15	0.00%
Mercury	13	0.00%
WebSTAR V	12	0.00%
ModusMail	11	0.00%
Interscan	10	0.00%
Neon Mail Server	6	0.00%
MessageWall	6	0.00%
NetIQ MailMarshal	2	0.00%
WebSTAR	1	0.00%
MAILsweeper	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (604,931 servers)
Version	Number of Servers	Percent
4.86	470,096	77.71%
4.85	30,662	5.07%
4.72	16,131	2.67%
4.80	15,035	2.49%
4.84	13,439	2.22%
4.76	11,812	1.95%
4.82	11,050	1.83%
4.80.1	10,919	1.80%
4.86.2	8,352	1.38%
Other	17,435	2.88%
Postfix (364,470 servers)
Version	Number of Servers	Percent
Other	364,470	100.00%
Sendmail (67,479 servers)
Version	Number of Servers	Percent
8.14.5	14,903	22.09%
8.14.4	13,634	20.20%
8.13.8	13,214	19.58%
8.13.1	7,979	11.82%
8.14.3	4,111	6.09%
8.14.9	2,113	3.13%
8.14.7	1,555	2.30%
8.12.11.20060308	1,365	2.02%
8.15.2	1,298	1.92%
8.14.2	780	1.16%
Other	6,527	9.67%
MailEnable (27,362 servers)
Version	Number of Servers	Percent
8.60--	2,319	8.48%
9.00--	1,807	6.60%
6.5--	1,614	5.90%
8.53--	1,511	5.52%
1.986--	1,364	4.99%
8.51--	1,057	3.86%
8.04--	751	2.74%
5.10--	707	2.58%
8.60-8.60-	646	2.36%
8.50--	633	2.31%
4.26--	535	1.96%
8.00--	525	1.92%
7.06--	490	1.79%
6.0--	481	1.76%
7.0--	331	1.21%
7.07--	315	1.15%
7.50--	310	1.13%
8.55--	295	1.08%
6.57--	293	1.07%
8.60--8.60	288	1.05%
6.70--	285	1.04%
Other	10,805	39.49%
Microsoft (19,555 servers)
Version	Number of Servers	Percent
6.0.3790.4675	13,581	69.45%
7.5.7601.17514	1,644	8.41%
6.0.3790.3959	1,591	8.14%
8.5.9600.16384	589	3.01%
6.0.3790.1830	417	2.13%
7.0.6002.18264	386	1.97%
8.0.9200.16384	269	1.38%
5.0.2195.7381	223	1.14%
Other	855	4.37%
MDaemon (16,039 servers)
Version	Number of Servers	Percent
15.5.3	1,929	12.03%
16.0.0	1,122	7.00%
15.0.3	933	5.82%
11.0.3	743	4.63%
13.5.1	697	4.35%
11.0.0	673	4.20%
13.0.4	605	3.77%
13.0.5	595	3.71%
15.5.2	577	3.60%
13.6.3	381	2.38%
12.5.6	351	2.19%
15.5.1	341	2.13%
10.0.0	308	1.92%
12.5.4	300	1.87%
10.1.2	271	1.69%
14.5.2	254	1.58%
14.0.3	214	1.33%
10.1.1	214	1.33%
10.1.0	206	1.28%
14.5.3	181	1.13%
9.6.6	169	1.05%
13.0.2	169	1.05%
9.6.1	165	1.03%
Other	4,641	28.94%
IMail (3,329 servers)
Version	Number of Servers	Percent
12.5.4.146	471	14.15%
8.22	328	9.85%
12.5.3.93	296	8.89%
12.4.1.15	239	7.18%
9.23	222	6.67%
12.3.0.100	180	5.41%
8.15	162	4.87%
8.05	136	4.09%
12.4.2.27	109	3.27%
12.2.0.235	97	2.91%
11.5	89	2.67%
11.03	85	2.55%
12.5.3.99	70	2.10%
12.5.1.60	59	1.77%
12.5.2.62	52	1.56%
12.4.1.9	52	1.56%
10.02	51	1.53%
7.07	50	1.50%
11.02	49	1.47%
7.15	44	1.32%
12.1.0.270	42	1.26%
Other	446	13.40%
CommuniGate Pro (2,187 servers)
Version	Number of Servers	Percent
5.1.16	232	10.61%
6.1.8	114	5.21%
6.0.11	102	4.66%
6.1.9	93	4.25%
6.0.9	87	3.98%
6.1.7	85	3.89%
5.4.11	84	3.84%
5.2.20	73	3.34%
6.1.5	73	3.34%
6.1.2	59	2.70%
6.1.6	53	2.42%
6.0.10	46	2.10%
5.3.13	45	2.06%
5.2.3	45	2.06%
5.3.15	43	1.97%
5.0.14	43	1.97%
4.1.8	40	1.83%
6.0.7	37	1.69%
6.1.4	34	1.55%
5.2.16	28	1.28%
6.0.5	26	1.19%
5.4.8	26	1.19%
5.1.12	25	1.14%
6.0.8	22	1.01%
Other	672	30.73%
Lotus Domino (1,779 servers)
Version	Number of Servers	Percent
8.5.3FP6	284	15.96%
8.5.3	260	14.61%
8.5.2	83	4.67%
8.5.1	64	3.60%
7.0.2	61	3.43%
8.5	57	3.20%
8.5.3FP3	53	2.98%
8.5.3FP2	52	2.92%
8.5.2FP4	48	2.70%
8.5.2FP3	45	2.53%
8.5.3FP4	40	2.25%
7.0.3	39	2.19%
8.5.3FP1	38	2.14%
8.5.2FP2	36	2.02%
8.5.3FP5	35	1.97%
7.0.1	32	1.80%
8.0.1	30	1.69%
8.0	27	1.52%
7.0	26	1.46%
6.5.1	25	1.41%
8.5.1FP5	23	1.29%
6.5.3	22	1.24%
6.5.4	20	1.12%
6.5	20	1.12%
8.5.2FP1	19	1.07%
Other	340	19.11%
WinWebMail (1,602 servers)
Version	Number of Servers	Percent
3.9.0.7	331	20.66%
3.8.1.3	264	16.48%
3.7.6.1	125	7.80%
3.9.0.1	118	7.37%
3.8.0.1	111	6.93%
3.8.1.5	86	5.37%
3.7.3.1	75	4.68%
3.8.5.1	70	4.37%
3.8.1.1	68	4.24%
3.7.7.3	55	3.43%
3.8.6.1	54	3.37%
3.7.1.1	44	2.75%
3.8.2.1	38	2.37%
3.8.3.1	24	1.50%
3.7.5.1	22	1.37%
3.8.3.3	19	1.19%
3.9.0.5	18	1.12%
3.7.0.5	17	1.06%
Other	63	3.93%
XMail (1,366 servers)
Version	Number of Servers	Percent
1.27	563	41.22%
1.22	376	27.53%
1.25	148	10.83%
1.26	115	8.42%
1.24	56	4.10%
1.21	32	2.34%
1.23	17	1.24%
1.20	14	1.02%
Other	45	3.29%
Qmail Toaster (1,067 servers)
Version	Number of Servers	Percent
1.3	999	93.63%
1.2	18	1.69%
1.03.5	13	1.22%
1.03	11	1.03%
Other	26	2.44%
SurgeSMTP (798 servers)
Version	Number of Servers	Percent
7.1e-1	206	25.81%
6.5a2-2	88	11.03%
6.9c-1	74	9.27%
6.7c-1	50	6.27%
7.0c2-2	46	5.76%
6.5a-1	31	3.88%
6.3c2-2	24	3.01%
3.9e-1	20	2.51%
6.4a-1	19	2.38%
6.1c-1	18	2.26%
5.2a-1	17	2.13%
3.8k4-4	16	2.01%
7.1f-32	13	1.63%
5.3h2-2	12	1.50%
7.1f-9	11	1.38%
4.0u4-4	10	1.25%
Other	143	17.92%
Kerio (673 servers)
Version	Number of Servers	Percent
6.7.3	142	21.10%
6.7.0	77	11.44%
6.6.2	59	8.77%
6.5.2	49	7.28%
6.5.0	44	6.54%
6.7.2	40	5.94%
6.4.1	33	4.90%
6.6.1	31	4.61%
6.7.1	26	3.86%
6.3.1	25	3.71%
6.5.1	22	3.27%
6.4.0	18	2.67%
6.3.0	17	2.53%
6.6.0	12	1.78%
6.4.2	11	1.63%
6.1.3	9	1.34%
6.2.0	7	1.04%
Other	51	7.58%
Merak (432 servers)
Version	Number of Servers	Percent
8.0.3	142	32.87%
8.9.1	60	13.89%
8.5.0	30	6.94%
8.3.8	24	5.56%
7.4.5	22	5.09%
7.5.2	21	4.86%
7.6.4	17	3.94%
7.6.1	13	3.01%
7.0.1	12	2.78%
8.3.15	10	2.31%
7.2.0	8	1.85%
7.4.2	7	1.62%
8.9.0	5	1.16%
6.0.8	5	1.16%
Other	56	12.96%
ArGoSoft (302 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	94	31.13%
1.8 (1.8.9.5)	40	13.25%
1.8 (1.8.9.3)	33	10.93%
1.8 (1.8.9.1)	31	10.26%
1.8 (1.8.8.7)	16	5.30%
1.8 (1.8.8.8)	14	4.64%
1.8 (1.8.9.2)	8	2.65%
1.8 (1.8.7.3)	6	1.99%
1.8 (1.8.9.4)	6	1.99%
1.8 (1.8.6.0)	6	1.99%
1.8 (1.8.8.2)	4	1.32%
1.8 (1.8.8.9)	4	1.32%
Other	40	13.25%
OpenSMTPD (261 servers)
Version	Number of Servers	Percent
Other	261	100.00%
MagicMail (238 servers)
Version	Number of Servers	Percent
Other	238	100.00%
Post.Office (204 servers)
Version	Number of Servers	Percent
4.2.2	44	21.57%
4.3	26	12.75%
3.5.3	26	12.75%
4.1.2.4	23	11.27%
4.2.1.3	9	4.41%
4.0.1	6	2.94%
3.1.2J	6	2.94%
3.9.2.3	6	2.94%
4.2.1.1	6	2.94%
4.1.1	5	2.45%
4.1.0.2	5	2.45%
3.5.3J	4	1.96%
4.2	4	1.96%
3.9.2	3	1.47%
4.1.2.3	3	1.47%
3.1.2	3	1.47%
3.5.1	3	1.47%
Other	22	10.78%
Gordano Messaging Suite (GMS) (173 servers)
Version	Number of Servers	Percent
Other	173	100.00%
GroupWise (164 servers)
Version	Number of Servers	Percent
14.2.0	30	18.29%
14.0.1	17	10.37%
8.0.3	17	10.37%
6.5.7	15	9.15%
7.0.3	13	7.93%
14.0.2	10	6.10%
14.0.0	9	5.49%
7.0.2	7	4.27%
8.0.2	7	4.27%
7.0.4	5	3.05%
6.0.4	4	2.44%
6.5.4	3	1.83%
6.5.6	3	1.83%
7.0.1	3	1.83%
8.0.1	2	1.22%
12.0.4	2	1.22%
6.0.3	2	1.22%
12.0.1	2	1.22%
6.5.5	2	1.22%
12.0.0	2	1.22%
6.0.2	2	1.22%
12.0.2	2	1.22%
Other	5	3.05%
Trend Micro (102 servers)
Version	Number of Servers	Percent
5.7	40	39.22%
5.5	19	18.63%
5.18	18	17.65%
7.0	11	10.78%
7.1	4	3.92%
8.5	3	2.94%
3.53	2	1.96%
7.5	2	1.96%
Other	3	2.94%
InterScan VirusWall (55 servers)
Version	Number of Servers	Percent
Other	55	100.00%
Mirapoint (38 servers)
Version	Number of Servers	Percent
4.4.3-GA	7	18.42%
4.3.6-GA	5	13.16%
4.4.5-GA	4	10.53%
4.4.2a-FCS	3	7.89%
4.3.5-GA	3	7.89%
4.3.3-GA	2	5.26%
3.10.10a-GA	2	5.26%
4.4.4-GA	2	5.26%
4.1.10-GA	2	5.26%
4.4.7-GA	2	5.26%
4.1.9-GA	1	2.63%
4.4.5a-GA	1	2.63%
3.7.5a-GA	1	2.63%
3.8.4-GA	1	2.63%
3.10.2-GA	1	2.63%
4.4.6-GA	1	2.63%
Other	0	0.00%
VisNetic (34 servers)
Version	Number of Servers	Percent
9.3.2.0	8	23.53%
9.1.4.1	4	11.76%
6.2.2.0	3	8.82%
5.0.2.3	3	8.82%
7.6.1.0	2	5.88%
5.5.8.3	2	5.88%
8.5.0.8	2	5.88%
5.3.5.0	2	5.88%
8.0.3	1	2.94%
8.3.0.1	1	2.94%
5.8.6.6	1	2.94%
8.5.0.5	1	2.94%
8.0.3.1	1	2.94%
9.1.4.0	1	2.94%
5.0.2.0	1	2.94%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.94%
Other	0	0.00%
OpenVMS (15 servers)
Version	Number of Servers	Percent
8.4	5	33.33%
8.3	5	33.33%
7.3	5	33.33%
Other	0	0.00%
Mercury (13 servers)
Version	Number of Servers	Percent
3.32	7	53.85%
1.48	4	30.77%
3.21	1	7.69%
4.x	1	7.69%
Other	0	0.00%
WebSTAR V (12 servers)
Version	Number of Servers	Percent
5.4.1	6	50.00%
5.4.0	4	33.33%
5.3.4	1	8.33%
5.3.2	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%
Interscan (10 servers)
Version	Number of Servers	Percent
3.81-Build_1084	2	20.00%
3.81-Build_1022	2	20.00%
3.55 (build 1029)	2	20.00%
3.5 (build 1294)	1	10.00%
3.8-Build_3013	1	10.00%
3.53 (build 2013)	1	10.00%
3.55 (build 1016)	1	10.00%
Other	0	0.00%
Neon Mail Server (6 servers)
Version	Number of Servers	Percent
3.0.7	2	33.33%
3.1.0	2	33.33%
3.1.4	1	16.67%
3.1.2	1	16.67%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
NetIQ MailMarshal (2 servers)
Version	Number of Servers	Percent
5.5.6.5	1	50.00%
5.5.6.7	1	50.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
MAILsweeper (1 servers)
Version	Number of Servers	Percent
4.3.20.0	1	100.00%
Other	0	0.00%