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	2,441,369	100.0%
Number of Servers that didn't respond	430,943	17.65%
Server didn't open socket	421,638	17.27%
Server didn't provide banner	9,305	0.38%
Server provided banner	2,010,426	82.35%
Server banner identifies software in use	1,140,138	46.70%

As indicated by the above table, of the 2,441,369 servers queried, only 1,140,138 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	597,357	52.39%
Postfix	349,913	30.69%
Sendmail	88,519	7.76%
Microsoft	36,163	3.17%
MailEnable	30,313	2.66%
MDaemon	18,539	1.63%
IMail	4,471	0.39%
CommuniGate Pro	2,654	0.23%
Lotus Domino	2,635	0.23%
WinWebMail	2,104	0.18%
XMail	1,668	0.15%
Qmail Toaster	1,319	0.12%
Kerio	924	0.08%
SurgeSMTP	871	0.08%
Merak	635	0.06%
ArGoSoft	417	0.04%
MagicMail	274	0.02%
Post.Office	247	0.02%
GroupWise	245	0.02%
Gordano Messaging Suite (GMS)	215	0.02%
OpenSMTPD	192	0.02%
Trend Micro	154	0.01%
InterScan VirusWall	76	0.01%
Mirapoint	63	0.01%
VisNetic	46	0.00%
Mercury	27	0.00%
Interscan	21	0.00%
OpenVMS	18	0.00%
WebSTAR V	15	0.00%
Neon Mail Server	12	0.00%
ModusMail	10	0.00%
NetIQ MailMarshal	8	0.00%
MessageWall	6	0.00%
MAILsweeper	4	0.00%
WebSTAR	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (597,357 servers)
Version	Number of Servers	Percent
4.84	286,845	48.02%
4.82	198,646	33.25%
4.80	21,970	3.68%
4.80.1	21,842	3.66%
4.76	17,984	3.01%
4.72	16,727	2.80%
4.69	8,423	1.41%
Other	24,920	4.17%
Postfix (349,913 servers)
Version	Number of Servers	Percent
Other	349,913	100.00%
Sendmail (88,519 servers)
Version	Number of Servers	Percent
8.13.8	19,422	21.94%
8.14.5	18,451	20.84%
8.14.4	14,940	16.88%
8.13.1	11,224	12.68%
8.14.3	6,268	7.08%
8.12.11.20060308	2,193	2.48%
8.13.6.20060614	2,013	2.27%
8.14.7	1,986	2.24%
8.14.9	1,394	1.57%
8.14.2	1,187	1.34%
8.11.6	1,045	1.18%
8.12.10	983	1.11%
8.14.1	894	1.01%
Other	6,519	7.36%
Microsoft (36,163 servers)
Version	Number of Servers	Percent
6.0.3790.4675	27,509	76.07%
6.0.3790.3959	2,993	8.28%
7.5.7601.17514	2,340	6.47%
6.0.3790.1830	815	2.25%
7.0.6002.18264	446	1.23%
5.0.2195.7381	374	1.03%
Other	1,686	4.66%
MailEnable (30,313 servers)
Version	Number of Servers	Percent
1.986--	2,441	8.05%
6.5--	2,125	7.01%
5.10--	1,194	3.94%
8.51--	1,039	3.43%
8.04--	1,027	3.39%
8.53--	981	3.24%
4.26--	870	2.87%
6.0--	849	2.80%
8.50--	812	2.68%
8.00--	781	2.58%
7.06--	759	2.50%
8.55--	561	1.85%
7.07--	503	1.66%
7.50--	471	1.55%
8.56--	459	1.51%
1.981--	456	1.50%
7.0--	450	1.48%
6.70--	419	1.38%
6.57--	417	1.38%
7.53--	413	1.36%
Other	13,286	43.83%
MDaemon (18,539 servers)
Version	Number of Servers	Percent
14.5.2	1,699	9.16%
14.5.3	1,564	8.44%
11.0.3	1,001	5.40%
11.0.0	929	5.01%
14.0.3	923	4.98%
13.5.1	861	4.64%
13.0.4	852	4.60%
13.0.5	785	4.23%
14.0.2	566	3.05%
12.5.6	465	2.51%
10.0.0	459	2.48%
10.1.2	366	1.97%
14.5.0	357	1.93%
13.6.2	332	1.79%
12.5.4	331	1.79%
10.1.1	318	1.72%
14.5.1	290	1.56%
13.6.0	283	1.53%
9.6.1	253	1.36%
10.1.0	253	1.36%
13.0.2	241	1.30%
13.5.2	241	1.30%
9.6.2	236	1.27%
9.6.6	235	1.27%
14.0.0	220	1.19%
13.0.3	219	1.18%
13.6.1	186	1.00%
Other	4,074	21.98%
IMail (4,471 servers)
Version	Number of Servers	Percent
8.22	501	11.21%
12.3.0.100	463	10.36%
12.4.2.27	384	8.59%
9.23	274	6.13%
12.2.0.235	273	6.11%
12.4.1.15	225	5.03%
8.15	209	4.67%
12.5.1.60	189	4.23%
8.05	186	4.16%
11.5	145	3.24%
12.5.0.246	144	3.22%
11.03	129	2.89%
11.01	126	2.82%
12.4.0.166	116	2.59%
7.15	80	1.79%
11.02	78	1.74%
10.02	73	1.63%
12.5.0.248	72	1.61%
12.4.1.9	68	1.52%
6.06	64	1.43%
7.07	63	1.41%
12.1.0.270	53	1.19%
8.00	52	1.16%
Other	504	11.27%
CommuniGate Pro (2,654 servers)
Version	Number of Servers	Percent
5.1.16	267	10.06%
6.0.9	224	8.44%
6.0.11	141	5.31%
6.0.10	140	5.28%
6.0.7	103	3.88%
5.4.11	89	3.35%
5.2.20	87	3.28%
6.0.8	70	2.64%
4.1.8	68	2.56%
6.0.5	59	2.22%
5.0.14	57	2.15%
5.3.13	56	2.11%
5.2.19	52	1.96%
6.1	49	1.85%
5.2.3	49	1.85%
5.1.12	42	1.58%
4.2.10	41	1.54%
5.4.4	38	1.43%
5.2.16	36	1.36%
5.3.15	34	1.28%
5.4.10	32	1.21%
5.4.8	32	1.21%
5.4.1	31	1.17%
6.0.1	30	1.13%
5.4.6	29	1.09%
Other	798	30.07%
Lotus Domino (2,635 servers)
Version	Number of Servers	Percent
8.5.3	405	15.37%
8.5.3FP6	278	10.55%
8.5.2	134	5.09%
8.5.3FP3	111	4.21%
8.5.1	105	3.98%
7.0.2	94	3.57%
8.5.3FP2	84	3.19%
8.5.2FP4	76	2.88%
8.5.3FP4	74	2.81%
8.5	74	2.81%
8.5.3FP5	72	2.73%
8.5.3FP1	66	2.50%
8.5.2FP2	65	2.47%
8.5.2FP3	61	2.31%
7.0.3	53	2.01%
7.0	46	1.75%
8.5.1FP5	46	1.75%
6.5.3	40	1.52%
6.5.1	38	1.44%
7.0.1	37	1.40%
8.0	37	1.40%
8.0.2	35	1.33%
8.0.1	35	1.33%
8.5.2FP1	33	1.25%
6.5	32	1.21%
6.5.4	31	1.18%
Other	473	17.95%
WinWebMail (2,104 servers)
Version	Number of Servers	Percent
3.8.1.3	366	17.40%
3.9.0.7	216	10.27%
3.7.6.1	187	8.89%
3.8.0.1	182	8.65%
3.9.0.1	153	7.27%
3.8.1.5	125	5.94%
3.8.5.1	107	5.09%
3.8.1.1	106	5.04%
3.8.6.1	104	4.94%
3.7.3.1	98	4.66%
3.7.7.3	84	3.99%
3.7.1.1	61	2.90%
3.8.2.1	58	2.76%
3.7.5.1	34	1.62%
3.8.3.1	33	1.57%
3.9.0.5	33	1.57%
3.8.3.3	28	1.33%
3.6.3.1	22	1.05%
3.7.0.3	22	1.05%
Other	85	4.04%
XMail (1,668 servers)
Version	Number of Servers	Percent
1.27	596	35.73%
1.22	478	28.66%
1.25	211	12.65%
1.26	149	8.93%
1.24	80	4.80%
1.21	39	2.34%
1.23	26	1.56%
1.20	20	1.20%
Other	69	4.14%
Qmail Toaster (1,319 servers)
Version	Number of Servers	Percent
1.3	1,250	94.77%
1.2	27	2.05%
1.03.5	15	1.14%
Other	27	2.05%
Kerio (924 servers)
Version	Number of Servers	Percent
6.7.3	184	19.91%
6.7.0	89	9.63%
6.6.2	87	9.42%
6.5.0	68	7.36%
6.5.2	67	7.25%
6.7.2	56	6.06%
6.4.1	54	5.84%
6.6.1	42	4.55%
6.7.1	41	4.44%
6.3.1	41	4.44%
6.5.1	27	2.92%
6.4.0	23	2.49%
6.3.0	22	2.38%
6.4.2	17	1.84%
6.6.0	14	1.52%
6.0.10	11	1.19%
6.1.3	10	1.08%
Other	71	7.68%
SurgeSMTP (871 servers)
Version	Number of Servers	Percent
6.7c-1	163	18.71%
6.5a2-2	159	18.25%
6.5a-1	62	7.12%
6.3c2-2	59	6.77%
5.2a-1	31	3.56%
6.8g-1	30	3.44%
5.3h2-2	27	3.10%
6.4a-1	26	2.99%
6.8h-8	24	2.76%
3.9e-1	23	2.64%
3.8k4-4	20	2.30%
6.8c-1	16	1.84%
6.1c-1	16	1.84%
4.0u4-4	13	1.49%
6.0a5-5	11	1.26%
Other	191	21.93%
Merak (635 servers)
Version	Number of Servers	Percent
8.0.3	212	33.39%
8.9.1	78	12.28%
8.5.0	49	7.72%
8.3.8	34	5.35%
7.4.5	29	4.57%
7.6.4	28	4.41%
7.5.2	28	4.41%
7.0.1	15	2.36%
7.6.1	13	2.05%
8.3.15	12	1.89%
9.0.0	11	1.73%
7.4.2	10	1.57%
7.2.0	10	1.57%
8.9.0	8	1.26%
8.2.4	8	1.26%
6.2.1	8	1.26%
Other	82	12.91%
ArGoSoft (417 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	107	25.66%
1.8 (1.8.9.5)	60	14.39%
1.8 (1.8.9.3)	58	13.91%
1.8 (1.8.9.1)	37	8.87%
1.8 (1.8.8.7)	26	6.24%
1.8 (1.8.8.8)	22	5.28%
1.8 (1.8.9.4)	14	3.36%
1.8 (1.8.9.2)	13	3.12%
1.8 (1.8.6.0)	10	2.40%
1.8 (1.8.7.3)	7	1.68%
1.8 (1.8.8.9)	5	1.20%
Other	58	13.91%
MagicMail (274 servers)
Version	Number of Servers	Percent
Other	274	100.00%
Post.Office (247 servers)
Version	Number of Servers	Percent
4.2.2	46	18.62%
3.5.3	36	14.57%
4.1.2.4	34	13.77%
4.1.0.2	12	4.86%
4.1.1	12	4.86%
3.9.2.3	9	3.64%
4.0.1	9	3.64%
4.2.1.3	9	3.64%
3.5.3J	6	2.43%
4.2	6	2.43%
4.1.0.3	6	2.43%
3.1.2J	6	2.43%
4.2.1.1	6	2.43%
3.1.2	4	1.62%
3.9.2	4	1.62%
3.8.7.4	4	1.62%
4.3	3	1.21%
4.1.2.3	3	1.21%
3.9.1.2	3	1.21%
4.1.0.4	3	1.21%
3.9.1	3	1.21%
Other	23	9.31%
GroupWise (245 servers)
Version	Number of Servers	Percent
7.0.3	33	13.47%
14.0.1	29	11.84%
8.0.2	26	10.61%
6.5.7	24	9.80%
8.0.3	20	8.16%
7.0.4	15	6.12%
7.0.2	13	5.31%
14.0.0	11	4.49%
12.0.2	11	4.49%
6.5.4	9	3.67%
6.5.6	9	3.67%
7.0.1	6	2.45%
6.0.4	6	2.45%
14.0.2	4	1.63%
8.0.1	3	1.22%
12.0.1	3	1.22%
8.0.0	3	1.22%
6.5.5	3	1.22%
6.5.0	3	1.22%
Other	14	5.71%
Gordano Messaging Suite (GMS) (215 servers)
Version	Number of Servers	Percent
Other	215	100.00%
OpenSMTPD (192 servers)
Version	Number of Servers	Percent
Other	192	100.00%
Trend Micro (154 servers)
Version	Number of Servers	Percent
5.7	59	38.31%
5.5	30	19.48%
5.18	29	18.83%
7.0	12	7.79%
7.1	10	6.49%
8.5	4	2.60%
3.53	3	1.95%
7.5	2	1.30%
Other	5	3.25%
InterScan VirusWall (76 servers)
Version	Number of Servers	Percent
Other	76	100.00%
Mirapoint (63 servers)
Version	Number of Servers	Percent
4.3.5-GA	9	14.29%
4.4.3-GA	7	11.11%
4.4.2a-FCS	5	7.94%
4.3.6-GA	5	7.94%
4.4.5a-GA	4	6.35%
4.1.10-GA	4	6.35%
3.10.4-GA	3	4.76%
4.4.5-GA	3	4.76%
3.10.10a-GA	3	4.76%
4.4.4-GA	3	4.76%
4.3.3-GA	2	3.17%
4.3.7-GA	2	3.17%
4.1.5-GA	2	3.17%
4.1.3-GA	1	1.59%
4.1.8-GA	1	1.59%
4.1.9-GA	1	1.59%
4.1.6-GA	1	1.59%
3.7.5a-GA	1	1.59%
4.2.3-GA	1	1.59%
3.8.7a	1	1.59%
3.7.3a-GA	1	1.59%
3.8.4-GA	1	1.59%
3.10.2-GA	1	1.59%
3.8.5-GA	1	1.59%
Other	0	0.00%
VisNetic (46 servers)
Version	Number of Servers	Percent
9.3.2.0	10	21.74%
9.1.4.1	6	13.04%
6.2.2.0	4	8.70%
8.5.0.8	4	8.70%
5.0.2.3	2	4.35%
9.1.4.0	2	4.35%
7.2.4.1	2	4.35%
7.6.1.0	2	4.35%
5.5.8.3	2	4.35%
5.3.5.0	2	4.35%
8.0.3	1	2.17%
8.3.0.1	1	2.17%
8.5.0.5	1	2.17%
5.4.5.4	1	2.17%
8.0.3.1	1	2.17%
5.4.5	1	2.17%
5.8.6.6	1	2.17%
5.0.2.0	1	2.17%
7.2.4.0	1	2.17%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.17%
Other	0	0.00%
Mercury (27 servers)
Version	Number of Servers	Percent
1.48	14	51.85%
3.32	11	40.74%
3.21	1	3.70%
4.x	1	3.70%
Other	0	0.00%
Interscan (21 servers)
Version	Number of Servers	Percent
3.81-Build_1022	5	23.81%
3.81-Build_1084	3	14.29%
3.55 (build 1016)	3	14.29%
3.55 (build 1029)	3	14.29%
3.5 (build 1294)	1	4.76%
3.8-Build_3013	1	4.76%
3.55 (build 1020)	1	4.76%
3.53 (build 1493)	1	4.76%
3.53 (build 2013)	1	4.76%
3.53 (build 2017)	1	4.76%
3.8-Build_1080	1	4.76%
Other	0	0.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.3	8	44.44%
7.3	6	33.33%
8.4	4	22.22%
Other	0	0.00%
WebSTAR V (15 servers)
Version	Number of Servers	Percent
5.4.1	7	46.67%
5.4.0	5	33.33%
5.3.4	3	20.00%
Other	0	0.00%
Neon Mail Server (12 servers)
Version	Number of Servers	Percent
3.0.7	4	33.33%
3.1.2	2	16.67%
3.1.4	2	16.67%
3.1.3	1	8.33%
3.1.0	1	8.33%
3.0.6	1	8.33%
3.0.9	1	8.33%
Other	0	0.00%
ModusMail (10 servers)
Version	Number of Servers	Percent
4.35.477.0	6	60.00%
4.1.361.21	1	10.00%
3.2.315.0	1	10.00%
4.35.477.8	1	10.00%
3.1.302.0	1	10.00%
Other	0	0.00%
NetIQ MailMarshal (8 servers)
Version	Number of Servers	Percent
6.0.3.8	4	50.00%
5.5.6.5	2	25.00%
5.5.4.17	1	12.50%
5.5.6.7	1	12.50%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
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%
WebSTAR (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%