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	1,953,716	100.0%
Number of Servers that didn't respond	344,117	17.61%
Server didn't open socket	336,840	17.24%
Server didn't provide banner	7,277	0.37%
Server provided banner	1,609,599	82.39%
Server banner identifies software in use	975,497	49.93%

As indicated by the above table, of the 1,953,716 servers queried, only 975,497 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	539,372	55.29%
Postfix	318,402	32.64%
Sendmail	55,839	5.72%
MailEnable	23,460	2.40%
Microsoft	13,351	1.37%
MDaemon	13,320	1.37%
IMail	2,427	0.25%
CommuniGate Pro	1,912	0.20%
Lotus Domino	1,258	0.13%
WinWebMail	1,231	0.13%
XMail	1,109	0.11%
Qmail Toaster	888	0.09%
SurgeSMTP	681	0.07%
Kerio	537	0.06%
Merak	344	0.04%
OpenSMTPD	255	0.03%
ArGoSoft	243	0.02%
MagicMail	227	0.02%
Post.Office	165	0.02%
Gordano Messaging Suite (GMS)	119	0.01%
GroupWise	118	0.01%
Trend Micro	81	0.01%
InterScan VirusWall	34	0.00%
Mirapoint	33	0.00%
VisNetic	32	0.00%
OpenVMS	10	0.00%
WebSTAR V	9	0.00%
ModusMail	9	0.00%
Neon Mail Server	8	0.00%
Mercury	8	0.00%
Interscan	6	0.00%
MessageWall	5	0.00%
WebSTAR	2	0.00%
NetIQ MailMarshal	1	0.00%
MAILsweeper	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (539,372 servers)
Version	Number of Servers	Percent
4.87	326,465	60.53%
4.86	110,205	20.43%
4.85	16,666	3.09%
4.84	16,256	3.01%
4.80	13,245	2.46%
4.72	11,878	2.20%
4.76	9,639	1.79%
4.82	8,711	1.62%
4.80.1	7,750	1.44%
Other	18,557	3.44%
Postfix (318,402 servers)
Version	Number of Servers	Percent
Other	318,402	100.00%
Sendmail (55,839 servers)
Version	Number of Servers	Percent
8.14.5	13,001	23.28%
8.14.4	11,870	21.26%
8.13.8	10,503	18.81%
8.13.1	6,171	11.05%
8.14.3	3,066	5.49%
8.14.9	1,637	2.93%
8.15.2	1,593	2.85%
8.14.7	1,360	2.44%
8.12.11.20060308	916	1.64%
8.14.2	597	1.07%
Other	5,125	9.18%
MailEnable (23,460 servers)
Version	Number of Servers	Percent
9.00--	2,106	8.98%
8.60--	1,746	7.44%
8.53--	1,272	5.42%
6.5--	1,181	5.03%
1.986--	1,003	4.28%
8.51--	873	3.72%
8.04--	652	2.78%
8.60-8.60-	536	2.28%
5.10--	516	2.20%
8.50--	482	2.05%
8.00--	451	1.92%
4.26--	398	1.70%
9.12--	376	1.60%
6.0--	364	1.55%
7.06--	353	1.50%
7.0--	266	1.13%
7.07--	256	1.09%
7.50--	246	1.05%
Other	10,383	44.26%
Microsoft (13,351 servers)
Version	Number of Servers	Percent
6.0.3790.4675	8,896	66.63%
7.5.7601.17514	1,298	9.72%
6.0.3790.3959	1,023	7.66%
8.5.9600.16384	588	4.40%
6.0.3790.1830	267	2.00%
7.0.6002.18264	263	1.97%
8.0.9200.16384	222	1.66%
5.0.2195.7381	141	1.06%
Other	653	4.89%
MDaemon (13,320 servers)
Version	Number of Servers	Percent
16.0.4	1,619	12.15%
13.5.1	618	4.64%
11.0.3	592	4.44%
16.0.2	581	4.36%
11.0.0	543	4.08%
15.5.3	533	4.00%
13.0.4	527	3.96%
15.0.3	522	3.92%
13.0.5	499	3.75%
16.0.3	465	3.49%
16.0.1	397	2.98%
13.6.3	331	2.48%
12.5.6	283	2.12%
10.0.0	250	1.88%
12.5.4	241	1.81%
15.5.2	238	1.79%
10.1.2	224	1.68%
14.5.2	208	1.56%
10.1.1	156	1.17%
10.1.0	155	1.16%
15.5.1	151	1.13%
9.6.1	136	1.02%
Other	4,051	30.41%
IMail (2,427 servers)
Version	Number of Servers	Percent
12.5.4.146	328	13.51%
12.5.3.93	216	8.90%
8.22	211	8.69%
12.4.1.15	180	7.42%
9.23	160	6.59%
8.15	131	5.40%
12.5.5.115	119	4.90%
12.3.0.100	118	4.86%
8.05	105	4.33%
11.03	73	3.01%
11.5	68	2.80%
12.2.0.235	48	1.98%
7.07	42	1.73%
12.5.3.99	42	1.73%
11.02	41	1.69%
12.5.1.60	37	1.52%
7.15	35	1.44%
12.5.2.62	35	1.44%
10.02	33	1.36%
12.4.1.9	32	1.32%
12.1.0.270	29	1.19%
8.00	26	1.07%
Other	318	13.10%
CommuniGate Pro (1,912 servers)
Version	Number of Servers	Percent
5.1.16	199	10.41%
6.1.10	119	6.22%
6.1.11	92	4.81%
6.0.11	80	4.18%
6.0.9	71	3.71%
5.2.20	70	3.66%
6.1.8	66	3.45%
5.4.11	63	3.29%
6.1.7	51	2.67%
6.1.2	50	2.62%
6.1.5	47	2.46%
6.1.9	46	2.41%
5.3.13	41	2.14%
5.2.3	37	1.94%
5.0.14	37	1.94%
5.3.15	36	1.88%
6.0.10	34	1.78%
4.1.8	31	1.62%
6.1.6	27	1.41%
6.1.4	27	1.41%
5.2.16	26	1.36%
6.0.7	22	1.15%
5.1.12	22	1.15%
Other	618	32.32%
Lotus Domino (1,258 servers)
Version	Number of Servers	Percent
8.5.3FP6	208	16.53%
8.5.3	182	14.47%
8.5.2	50	3.97%
8.5	47	3.74%
8.5.1	45	3.58%
7.0.2	41	3.26%
8.5.3FP2	37	2.94%
8.5.3FP4	35	2.78%
8.5.3FP3	35	2.78%
8.5.2FP4	34	2.70%
8.5.2FP3	33	2.62%
8.5.3FP1	29	2.31%
8.5.2FP2	24	1.91%
8.0.1	24	1.91%
7.0.3	24	1.91%
8.5.3FP5	22	1.75%
7.0.1	22	1.75%
8.5.1FP5	21	1.67%
7.0	20	1.59%
8.0	19	1.51%
8.0.2	17	1.35%
6.5.1	17	1.35%
8.5.2FP1	14	1.11%
6.5.4	13	1.03%
Other	245	19.48%
WinWebMail (1,231 servers)
Version	Number of Servers	Percent
3.9.0.7	282	22.91%
3.8.1.3	207	16.82%
3.7.6.1	95	7.72%
3.8.0.1	80	6.50%
3.9.0.1	79	6.42%
3.8.1.5	67	5.44%
3.7.3.1	57	4.63%
3.8.5.1	51	4.14%
3.8.1.1	50	4.06%
3.7.7.3	46	3.74%
3.8.6.1	42	3.41%
3.7.1.1	31	2.52%
3.8.2.1	29	2.36%
3.8.3.1	20	1.62%
3.7.5.1	16	1.30%
3.7.0.5	15	1.22%
3.8.3.3	14	1.14%
3.9.0.5	14	1.14%
Other	36	2.92%
XMail (1,109 servers)
Version	Number of Servers	Percent
1.27	456	41.12%
1.22	328	29.58%
1.25	109	9.83%
1.26	85	7.66%
1.24	47	4.24%
1.21	28	2.52%
1.23	14	1.26%
1.20	12	1.08%
Other	30	2.71%
Qmail Toaster (888 servers)
Version	Number of Servers	Percent
1.3	819	92.23%
1.03	22	2.48%
1.2	14	1.58%
1.03.5	10	1.13%
Other	23	2.59%
SurgeSMTP (681 servers)
Version	Number of Servers	Percent
7.1e-1	214	31.42%
6.5a2-2	59	8.66%
6.9c-1	45	6.61%
6.7c-1	40	5.87%
7.0c2-2	38	5.58%
6.5a-1	26	3.82%
3.9e-1	18	2.64%
6.4a-1	17	2.50%
5.2a-1	16	2.35%
7.2a-1	16	2.35%
6.3c2-2	15	2.20%
6.1c-1	14	2.06%
3.8k4-4	10	1.47%
7.1f-32	8	1.17%
5.3h2-2	8	1.17%
4.0u4-4	8	1.17%
7.1f-9	7	1.03%
Other	122	17.91%
Kerio (537 servers)
Version	Number of Servers	Percent
6.7.3	112	20.86%
6.7.0	51	9.50%
6.6.2	49	9.12%
6.5.2	43	8.01%
6.5.0	37	6.89%
6.7.2	33	6.15%
6.4.1	26	4.84%
6.7.1	24	4.47%
6.6.1	22	4.10%
6.3.1	22	4.10%
6.3.0	17	3.17%
6.5.1	16	2.98%
6.4.0	11	2.05%
6.6.0	9	1.68%
6.1.3	9	1.68%
6.2.0	8	1.49%
6.4.2	7	1.30%
Other	41	7.64%
Merak (344 servers)
Version	Number of Servers	Percent
8.0.3	109	31.69%
8.9.1	52	15.12%
8.5.0	27	7.85%
7.5.2	19	5.52%
8.3.8	17	4.94%
7.4.5	17	4.94%
7.6.1	12	3.49%
7.6.4	12	3.49%
8.3.15	9	2.62%
7.2.0	7	2.03%
7.0.1	7	2.03%
7.4.2	6	1.74%
6.1.0	4	1.16%
8.9.0	4	1.16%
6.0.8	4	1.16%
Other	38	11.05%
OpenSMTPD (255 servers)
Version	Number of Servers	Percent
Other	255	100.00%
ArGoSoft (243 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	78	32.10%
1.8 (1.8.9.5)	35	14.40%
1.8 (1.8.9.3)	27	11.11%
1.8 (1.8.9.1)	23	9.47%
1.8 (1.8.8.8)	12	4.94%
1.8 (1.8.9.2)	9	3.70%
1.8 (1.8.8.7)	8	3.29%
1.8 (1.8.7.3)	6	2.47%
1.8 (1.8.6.0)	5	2.06%
1.8 (1.8.9.4)	4	1.65%
1.8 (1.8.8.9)	4	1.65%
1.8 (1.8.7.6)	3	1.23%
1.8 (1.8.8.2)	3	1.23%
1.8 (1.8.8.4)	3	1.23%
Other	23	9.47%
MagicMail (227 servers)
Version	Number of Servers	Percent
Other	227	100.00%
Post.Office (165 servers)
Version	Number of Servers	Percent
4.2.2	35	21.21%
3.5.3	22	13.33%
4.3	21	12.73%
4.1.2.4	19	11.52%
4.2.1.3	9	5.45%
3.9.2.3	6	3.64%
4.0.1	5	3.03%
4.1.1	5	3.03%
3.1.2J	4	2.42%
3.1.2	4	2.42%
4.2.1.1	4	2.42%
3.5.3J	3	1.82%
3.8.7.4	3	1.82%
3.5.1	3	1.82%
3.5.4	2	1.21%
3.6.2	2	1.21%
4.1.2.3	2	1.21%
4.1.0.3	2	1.21%
4.1.0.2	2	1.21%
3.9.2	2	1.21%
Other	10	6.06%
Gordano Messaging Suite (GMS) (119 servers)
Version	Number of Servers	Percent
Other	119	100.00%
GroupWise (118 servers)
Version	Number of Servers	Percent
14.2.0	24	20.34%
14.0.1	12	10.17%
14.2.1	8	6.78%
8.0.3	8	6.78%
6.5.7	7	5.93%
7.0.3	7	5.93%
14.0.0	7	5.93%
7.0.4	6	5.08%
14.0.2	6	5.08%
7.0.2	4	3.39%
8.0.2	4	3.39%
6.0.3	3	2.54%
7.0.1	3	2.54%
12.0.3	3	2.54%
12.0.4	2	1.69%
12.0.1	2	1.69%
6.5.4	2	1.69%
6.0.2	2	1.69%
12.0.2	2	1.69%
Other	6	5.08%
Trend Micro (81 servers)
Version	Number of Servers	Percent
5.7	29	35.80%
5.5	15	18.52%
5.18	14	17.28%
7.0	9	11.11%
7.1	4	4.94%
8.5	3	3.70%
7.5	2	2.47%
3.53	2	2.47%
7.1.	1	1.23%
9.0	1	1.23%
8	1	1.23%
Other	0	0.00%
InterScan VirusWall (34 servers)
Version	Number of Servers	Percent
Other	34	100.00%
Mirapoint (33 servers)
Version	Number of Servers	Percent
4.4.3-GA	6	18.18%
4.3.5-GA	4	12.12%
4.4.5-GA	4	12.12%
4.4.2a-FCS	3	9.09%
4.3.6-GA	3	9.09%
3.10.10a-GA	2	6.06%
4.4.4-GA	2	6.06%
4.4.7-GA	2	6.06%
4.1.10-GA	2	6.06%
4.1.9-GA	1	3.03%
4.4.5a-GA	1	3.03%
3.7.5a-GA	1	3.03%
4.3.3-GA	1	3.03%
4.4.6-GA	1	3.03%
Other	0	0.00%
VisNetic (32 servers)
Version	Number of Servers	Percent
9.3.2.0	10	31.25%
9.1.4.1	3	9.38%
5.0.2.3	2	6.25%
6.2.2.0	2	6.25%
5.5.8.3	2	6.25%
8.5.0.8	2	6.25%
8.0.3	1	3.12%
8.3.0.1	1	3.12%
5.8.6.6	1	3.12%
8.5.0.5	1	3.12%
8.0.3.1	1	3.12%
9.1.4.0	1	3.12%
7.6.1.0	1	3.12%
5.0.2.0	1	3.12%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	3.12%
5.3.5.0	1	3.12%
7.2.4.1	1	3.12%
Other	0	0.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	4	40.00%
7.3	3	30.00%
8.3	3	30.00%
Other	0	0.00%
WebSTAR V (9 servers)
Version	Number of Servers	Percent
5.4.1	6	66.67%
5.4.0	2	22.22%
5.3.4	1	11.11%
Other	0	0.00%
ModusMail (9 servers)
Version	Number of Servers	Percent
4.35.477.0	5	55.56%
4.1.361.21	2	22.22%
3.2.315.0	1	11.11%
4.35.477.8	1	11.11%
Other	0	0.00%
Neon Mail Server (8 servers)
Version	Number of Servers	Percent
3.1.2	2	25.00%
3.0.7	2	25.00%
3.1.0	2	25.00%
3.1.4	1	12.50%
3.0.8	1	12.50%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	2	25.00%
3.21	1	12.50%
4.x	1	12.50%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1084	1	16.67%
3.5 (build 1294)	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.81-Build_1022	1	16.67%
3.55 (build 1016)	1	16.67%
Other	0	0.00%
MessageWall (5 servers)
Version	Number of Servers	Percent
1.0.8	5	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
NetIQ MailMarshal (1 servers)
Version	Number of Servers	Percent
5.5.6.7	1	100.00%
Other	0	0.00%
MAILsweeper (1 servers)
Version	Number of Servers	Percent
4.3.20.0	1	100.00%
Other	0	0.00%