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	2,069,331	100.0%
Number of Servers that didn't respond	355,957	17.20%
Server didn't open socket	348,436	16.84%
Server didn't provide banner	7,521	0.36%
Server provided banner	1,713,374	82.80%
Server banner identifies software in use	1,032,108	49.88%

As indicated by the above table, of the 2,069,331 servers queried, only 1,032,108 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	569,006	55.13%
Postfix	331,809	32.15%
Sendmail	61,191	5.93%
MailEnable	25,606	2.48%
Microsoft	16,944	1.64%
MDaemon	14,382	1.39%
IMail	2,906	0.28%
CommuniGate Pro	1,973	0.19%
Lotus Domino	1,521	0.15%
WinWebMail	1,382	0.13%
XMail	1,224	0.12%
Qmail Toaster	941	0.09%
SurgeSMTP	731	0.07%
Kerio	593	0.06%
Merak	391	0.04%
ArGoSoft	277	0.03%
OpenSMTPD	233	0.02%
MagicMail	227	0.02%
Post.Office	185	0.02%
Gordano Messaging Suite (GMS)	154	0.01%
GroupWise	148	0.01%
Trend Micro	99	0.01%
InterScan VirusWall	49	0.00%
Mirapoint	35	0.00%
VisNetic	30	0.00%
OpenVMS	14	0.00%
Mercury	13	0.00%
ModusMail	11	0.00%
WebSTAR V	9	0.00%
Interscan	8	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 (569,006 servers)
Version	Number of Servers	Percent
4.86	442,373	77.74%
4.85	28,265	4.97%
4.72	14,842	2.61%
4.80	14,081	2.47%
4.84	12,825	2.25%
4.76	10,885	1.91%
4.82	10,041	1.76%
4.80.1	9,589	1.69%
4.86.2	8,671	1.52%
Other	17,434	3.06%
Postfix (331,809 servers)
Version	Number of Servers	Percent
Other	331,809	100.00%
Sendmail (61,191 servers)
Version	Number of Servers	Percent
8.14.5	13,961	22.82%
8.14.4	12,457	20.36%
8.13.8	11,988	19.59%
8.13.1	6,725	10.99%
8.14.3	3,693	6.04%
8.14.9	1,928	3.15%
8.14.7	1,398	2.28%
8.15.2	1,251	2.04%
8.12.11.20060308	1,225	2.00%
8.14.2	692	1.13%
Other	5,873	9.60%
MailEnable (25,606 servers)
Version	Number of Servers	Percent
8.60--	2,142	8.37%
9.00--	1,792	7.00%
6.5--	1,474	5.76%
8.53--	1,415	5.53%
1.986--	1,261	4.92%
8.51--	975	3.81%
8.04--	702	2.74%
5.10--	641	2.50%
8.60-8.60-	602	2.35%
8.50--	578	2.26%
8.00--	482	1.88%
4.26--	479	1.87%
6.0--	439	1.71%
7.06--	437	1.71%
7.0--	307	1.20%
7.07--	302	1.18%
7.50--	281	1.10%
8.60--8.60	269	1.05%
8.55--	265	1.03%
6.57--	259	1.01%
Other	10,504	41.02%
Microsoft (16,944 servers)
Version	Number of Servers	Percent
6.0.3790.4675	11,691	69.00%
7.5.7601.17514	1,468	8.66%
6.0.3790.3959	1,340	7.91%
8.5.9600.16384	546	3.22%
6.0.3790.1830	363	2.14%
7.0.6002.18264	333	1.97%
8.0.9200.16384	238	1.40%
5.0.2195.5329	184	1.09%
5.0.2195.7381	182	1.07%
Other	599	3.54%
MDaemon (14,382 servers)
Version	Number of Servers	Percent
15.5.3	1,356	9.43%
16.0.1	1,250	8.69%
15.0.3	767	5.33%
11.0.3	658	4.58%
13.5.1	648	4.51%
11.0.0	603	4.19%
13.0.4	555	3.86%
13.0.5	532	3.70%
16.0.0	504	3.50%
15.5.2	469	3.26%
13.6.3	354	2.46%
12.5.6	320	2.23%
10.0.0	278	1.93%
15.5.1	264	1.84%
12.5.4	263	1.83%
10.1.2	246	1.71%
14.5.2	230	1.60%
14.0.3	180	1.25%
10.1.0	176	1.22%
10.1.1	173	1.20%
9.6.6	154	1.07%
13.0.2	153	1.06%
14.5.3	152	1.06%
9.6.1	147	1.02%
Other	3,950	27.46%
IMail (2,906 servers)
Version	Number of Servers	Percent
12.5.4.146	464	15.97%
8.22	289	9.94%
12.5.3.93	269	9.26%
12.4.1.15	214	7.36%
9.23	201	6.92%
8.15	154	5.30%
12.3.0.100	149	5.13%
8.05	121	4.16%
12.2.0.235	85	2.92%
11.03	84	2.89%
11.5	74	2.55%
12.5.3.99	66	2.27%
12.5.1.60	53	1.82%
12.5.2.62	49	1.69%
7.07	47	1.62%
12.4.1.9	44	1.51%
10.02	41	1.41%
7.15	40	1.38%
11.02	36	1.24%
6.06	31	1.07%
Other	395	13.59%
CommuniGate Pro (1,973 servers)
Version	Number of Servers	Percent
5.1.16	216	10.95%
6.1.8	106	5.37%
6.1.9	100	5.07%
6.0.11	95	4.82%
5.4.11	73	3.70%
6.0.9	72	3.65%
6.1.7	70	3.55%
6.1.5	67	3.40%
5.2.20	62	3.14%
6.1.2	53	2.69%
6.1.6	49	2.48%
5.2.3	41	2.08%
6.0.10	39	1.98%
5.0.14	39	1.98%
4.1.8	38	1.93%
5.3.15	37	1.88%
6.0.7	33	1.67%
5.3.13	32	1.62%
6.1.4	31	1.57%
5.2.16	25	1.27%
5.4.8	22	1.12%
6.0.5	21	1.06%
5.4.6	21	1.06%
6.0.8	20	1.01%
Other	611	30.97%
Lotus Domino (1,521 servers)
Version	Number of Servers	Percent
8.5.3FP6	246	16.17%
8.5.3	209	13.74%
8.5.2	68	4.47%
8.5.1	64	4.21%
7.0.2	51	3.35%
8.5.3FP2	45	2.96%
8.5.3FP3	42	2.76%
8.5.2FP4	40	2.63%
8.5.3FP4	39	2.56%
8.5	39	2.56%
8.5.2FP3	39	2.56%
7.0.3	33	2.17%
8.5.3FP5	33	2.17%
8.5.3FP1	33	2.17%
8.5.2FP2	32	2.10%
7.0.1	26	1.71%
8.0.1	25	1.64%
8.5.1FP5	22	1.45%
6.5.1	22	1.45%
8.0	21	1.38%
6.5.3	20	1.31%
7.0	19	1.25%
8.5.2FP1	18	1.18%
6.5	17	1.12%
6.5.4	17	1.12%
Other	301	19.79%
WinWebMail (1,382 servers)
Version	Number of Servers	Percent
3.9.0.7	299	21.64%
3.8.1.3	231	16.71%
3.7.6.1	110	7.96%
3.9.0.1	105	7.60%
3.8.0.1	96	6.95%
3.8.1.5	71	5.14%
3.7.3.1	64	4.63%
3.8.1.1	59	4.27%
3.8.5.1	56	4.05%
3.8.6.1	50	3.62%
3.7.7.3	45	3.26%
3.7.1.1	36	2.60%
3.8.2.1	33	2.39%
3.8.3.1	20	1.45%
3.7.5.1	19	1.37%
3.8.3.3	17	1.23%
Other	71	5.14%
XMail (1,224 servers)
Version	Number of Servers	Percent
1.27	510	41.67%
1.22	330	26.96%
1.25	134	10.95%
1.26	104	8.50%
1.24	53	4.33%
1.21	26	2.12%
1.23	16	1.31%
1.20	14	1.14%
Other	37	3.02%
Qmail Toaster (941 servers)
Version	Number of Servers	Percent
1.3	880	93.52%
1.2	14	1.49%
1.03.5	12	1.28%
1.03	10	1.06%
Other	25	2.66%
SurgeSMTP (731 servers)
Version	Number of Servers	Percent
7.1e-1	198	27.09%
6.5a2-2	82	11.22%
6.9c-1	61	8.34%
6.7c-1	45	6.16%
7.0c2-2	40	5.47%
6.5a-1	29	3.97%
6.3c2-2	22	3.01%
3.9e-1	21	2.87%
6.4a-1	19	2.60%
6.1c-1	17	2.33%
5.2a-1	17	2.33%
7.1f-32	12	1.64%
3.8k4-4	11	1.50%
5.3h2-2	9	1.23%
4.0u4-4	9	1.23%
7.1f-9	8	1.09%
Other	131	17.92%
Kerio (593 servers)
Version	Number of Servers	Percent
6.7.3	126	21.25%
6.7.0	63	10.62%
6.6.2	51	8.60%
6.5.2	48	8.09%
6.5.0	39	6.58%
6.7.2	37	6.24%
6.6.1	30	5.06%
6.4.1	25	4.22%
6.7.1	24	4.05%
6.3.1	24	4.05%
6.5.1	17	2.87%
6.4.0	15	2.53%
6.3.0	14	2.36%
6.6.0	12	2.02%
6.4.2	10	1.69%
6.2.0	8	1.35%
6.1.3	6	1.01%
Other	44	7.42%
Merak (391 servers)
Version	Number of Servers	Percent
8.0.3	134	34.27%
8.9.1	51	13.04%
8.5.0	26	6.65%
8.3.8	22	5.63%
7.5.2	20	5.12%
7.4.5	19	4.86%
7.6.4	14	3.58%
7.6.1	13	3.32%
8.3.15	10	2.56%
7.0.1	9	2.30%
8.9.0	6	1.53%
7.2.0	6	1.53%
7.4.2	5	1.28%
6.1.0	5	1.28%
6.0.8	5	1.28%
Other	46	11.76%
ArGoSoft (277 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	91	32.85%
1.8 (1.8.9.5)	38	13.72%
1.8 (1.8.9.3)	28	10.11%
1.8 (1.8.9.1)	27	9.75%
1.8 (1.8.8.8)	13	4.69%
1.8 (1.8.8.7)	13	4.69%
1.8 (1.8.9.2)	8	2.89%
1.8 (1.8.7.3)	6	2.17%
1.8 (1.8.9.4)	6	2.17%
1.8 (1.8.8.2)	4	1.44%
1.8 (1.8.8.9)	4	1.44%
1.8 (1.8.6.0)	4	1.44%
1.8 (1.8.7.6)	3	1.08%
1.8 (1.8.9.0)	3	1.08%
1.8 (1.8.8.4)	3	1.08%
Other	26	9.39%
OpenSMTPD (233 servers)
Version	Number of Servers	Percent
Other	233	100.00%
MagicMail (227 servers)
Version	Number of Servers	Percent
Other	227	100.00%
Post.Office (185 servers)
Version	Number of Servers	Percent
4.2.2	39	21.08%
3.5.3	25	13.51%
4.1.2.4	23	12.43%
4.3	22	11.89%
4.2.1.3	8	4.32%
4.2.1.1	6	3.24%
4.0.1	5	2.70%
3.1.2J	5	2.70%
4.1.0.2	5	2.70%
4.1.1	4	2.16%
3.9.2.3	4	2.16%
4.2	3	1.62%
3.9.2	3	1.62%
4.1.2.3	3	1.62%
3.1.2	3	1.62%
3.5.1	3	1.62%
3.5.3J	2	1.08%
3.5.4	2	1.08%
3.9.1.3	2	1.08%
3.6.2	2	1.08%
4.1.0.3	2	1.08%
3.9.1.2	2	1.08%
3.8.7.4	2	1.08%
4.1.2.2	2	1.08%
Other	8	4.32%
Gordano Messaging Suite (GMS) (154 servers)
Version	Number of Servers	Percent
Other	154	100.00%
GroupWise (148 servers)
Version	Number of Servers	Percent
14.2.0	35	23.65%
8.0.3	14	9.46%
6.5.7	13	8.78%
14.0.1	12	8.11%
7.0.3	11	7.43%
14.0.0	8	5.41%
14.0.2	7	4.73%
7.0.2	6	4.05%
8.0.2	4	2.70%
7.0.4	4	2.70%
6.0.4	4	2.70%
6.5.6	3	2.03%
8.0.1	2	1.35%
12.0.4	2	1.35%
6.0.3	2	1.35%
7.0.1	2	1.35%
8.0.0	2	1.35%
12.0.1	2	1.35%
6.5.4	2	1.35%
6.5.5	2	1.35%
12.0.3	2	1.35%
12.0.0	2	1.35%
6.0.2	2	1.35%
12.0.2	2	1.35%
Other	3	2.03%
Trend Micro (99 servers)
Version	Number of Servers	Percent
5.7	39	39.39%
5.5	18	18.18%
5.18	17	17.17%
7.0	11	11.11%
7.1	5	5.05%
8.5	3	3.03%
7.5	2	2.02%
7.1.	1	1.01%
8.5.2	1	1.01%
3.53	1	1.01%
8	1	1.01%
Other	0	0.00%
InterScan VirusWall (49 servers)
Version	Number of Servers	Percent
Other	49	100.00%
Mirapoint (35 servers)
Version	Number of Servers	Percent
4.4.3-GA	6	17.14%
4.4.5-GA	4	11.43%
4.4.2a-FCS	3	8.57%
4.3.5-GA	3	8.57%
4.3.6-GA	3	8.57%
4.3.3-GA	2	5.71%
3.10.10a-GA	2	5.71%
4.4.4-GA	2	5.71%
4.4.7-GA	2	5.71%
4.1.10-GA	2	5.71%
4.1.9-GA	1	2.86%
4.4.5a-GA	1	2.86%
3.7.5a-GA	1	2.86%
3.8.4-GA	1	2.86%
3.10.2-GA	1	2.86%
4.4.6-GA	1	2.86%
Other	0	0.00%
VisNetic (30 servers)
Version	Number of Servers	Percent
9.3.2.0	6	20.00%
9.1.4.1	4	13.33%
6.2.2.0	3	10.00%
5.0.2.3	3	10.00%
7.6.1.0	2	6.67%
8.5.0.8	2	6.67%
5.3.5.0	2	6.67%
8.0.3	1	3.33%
8.3.0.1	1	3.33%
5.8.6.6	1	3.33%
5.5.8.3	1	3.33%
8.0.3.1	1	3.33%
9.1.4.0	1	3.33%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	3.33%
7.2.4.1	1	3.33%
Other	0	0.00%
OpenVMS (14 servers)
Version	Number of Servers	Percent
7.3	6	42.86%
8.3	5	35.71%
8.4	3	21.43%
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%
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%
WebSTAR V (9 servers)
Version	Number of Servers	Percent
5.4.1	5	55.56%
5.4.0	3	33.33%
5.3.2	1	11.11%
Other	0	0.00%
Interscan (8 servers)
Version	Number of Servers	Percent
3.81-Build_1084	1	12.50%
3.5 (build 1294)	1	12.50%
3.8-Build_3013	1	12.50%
3.81-Build_1022	1	12.50%
3.8-Build_1080	1	12.50%
3.53 (build 2013)	1	12.50%
3.55 (build 1029)	1	12.50%
3.55 (build 1016)	1	12.50%
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%