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	2,387,923	100.0%
Number of Servers that didn't respond	404,616	16.94%
Server didn't open socket	392,637	16.44%
Server didn't provide banner	11,979	0.50%
Server provided banner	1,983,307	83.06%
Server banner identifies software in use	1,083,541	45.38%

As indicated by the above table, of the 2,387,923 servers queried, only 1,083,541 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	498,695	46.02%
Postfix	267,056	24.65%
Sendmail	123,553	11.40%
Microsoft	108,151	9.98%
MailEnable	33,425	3.08%
MDaemon	21,181	1.95%
IMail	7,984	0.74%
Lotus Domino	4,716	0.44%
WinWebMail	3,726	0.34%
CommuniGate Pro	3,245	0.30%
XMail	2,265	0.21%
Kerio	1,809	0.17%
Qmail Toaster	1,635	0.15%
Merak	1,358	0.13%
SurgeSMTP	1,077	0.10%
ArGoSoft	835	0.08%
GroupWise	576	0.05%
Trend Micro	392	0.04%
Post.Office	388	0.04%
Gordano Messaging Suite (GMS)	367	0.03%
MagicMail	324	0.03%
Mirapoint	183	0.02%
InterScan VirusWall	148	0.01%
VisNetic	142	0.01%
Mercury	54	0.00%
Interscan	51	0.00%
NetIQ MailMarshal	47	0.00%
WebSTAR V	33	0.00%
Neon Mail Server	30	0.00%
MessageWall	21	0.00%
OpenSMTPD	21	0.00%
OpenVMS	19	0.00%
WebSTAR	14	0.00%
ModusMail	14	0.00%
MAILsweeper	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (498,695 servers)
Version	Number of Servers	Percent
4.77	348,850	69.95%
4.69	50,339	10.09%
4.76	44,479	8.92%
4.72	22,730	4.56%
4.67	6,767	1.36%
4.63	5,291	1.06%
Other	20,239	4.06%
Postfix (267,056 servers)
Version	Number of Servers	Percent
Other	267,056	100.00%
Sendmail (123,553 servers)
Version	Number of Servers	Percent
8.13.8	33,022	26.73%
8.13.1	19,227	15.56%
8.14.3	16,307	13.20%
8.14.5	12,357	10.00%
8.14.4	11,130	9.01%
8.12.11.20060308	4,875	3.95%
8.13.6.20060614	3,895	3.15%
8.14.2	3,605	2.92%
8.11.6	2,550	2.06%
8.12.10	2,275	1.84%
8.14.1	2,054	1.66%
8.13.6	1,892	1.53%
8.13.7	1,634	1.32%
8.12.11.20060614	1,595	1.29%
8.12.11	1,389	1.12%
Other	5,746	4.65%
Microsoft (108,151 servers)
Version	Number of Servers	Percent
6.0.3790.4675	86,424	79.91%
6.0.3790.3959	12,844	11.88%
6.0.3790.1830	3,480	3.22%
7.5.7601.17514	1,383	1.28%
5.0.2195.7381	1,221	1.13%
Other	2,799	2.59%
MailEnable (33,425 servers)
Version	Number of Servers	Percent
1.986--	7,932	23.73%
5.10--	2,639	7.90%
4.26--	2,432	7.28%
1.981--	1,460	4.37%
6.0--	1,134	3.39%
1.983--	909	2.72%
6.03--	789	2.36%
0-3.63-	759	2.27%
5.51--	683	2.04%
3.62--	655	1.96%
5.11--	591	1.77%
6.53--	568	1.70%
6.5--	486	1.45%
4.22--	386	1.15%
0-1.87-	380	1.14%
0-4.26-	375	1.12%
Other	11,247	33.65%
MDaemon (21,181 servers)
Version	Number of Servers	Percent
12.5.6	3,493	16.49%
11.0.3	2,514	11.87%
11.0.0	1,319	6.23%
12.5.4	1,172	5.53%
10.0.0	838	3.96%
10.1.2	799	3.77%
10.1.1	708	3.34%
12.5.3	695	3.28%
12.0.3	574	2.71%
9.6.1	532	2.51%
9.6.6	487	2.30%
10.1.0	463	2.19%
12.5.2	453	2.14%
12.0.4	407	1.92%
9.6.2	327	1.54%
9.5.2	320	1.51%
10.0.5	320	1.51%
9.6.5	302	1.43%
9.5.1	264	1.25%
10.0.2	260	1.23%
9.5.6	255	1.20%
12.5.5	248	1.17%
9.6.4	238	1.12%
12.0.1	232	1.10%
8.1.3	228	1.08%
12.0.0	227	1.07%
Other	3,506	16.55%
IMail (7,984 servers)
Version	Number of Servers	Percent
8.22	1,538	19.26%
11.5	1,154	14.45%
9.23	502	6.29%
11.03	501	6.28%
8.15	488	6.11%
11.01	424	5.31%
12.0.0.384	329	4.12%
8.05	307	3.85%
10.02	254	3.18%
11.0	216	2.71%
7.07	209	2.62%
12.0.0.348	201	2.52%
11.02	180	2.25%
6.06	147	1.84%
12.1.0.270	139	1.74%
10.01	136	1.70%
7.15	133	1.67%
8.00	130	1.63%
9.21	97	1.21%
9.10	89	1.11%
Other	810	10.15%
Lotus Domino (4,716 servers)
Version	Number of Servers	Percent
8.5.3	800	16.96%
8.5.2	371	7.87%
8.5.2FP2	300	6.36%
8.5.3FP1	296	6.28%
8.5.1	248	5.26%
7.0.2	205	4.35%
8.5	186	3.94%
8.5.2FP3	170	3.60%
7.0.3	127	2.69%
8.5.2FP1	122	2.59%
7.0.1	100	2.12%
8.0.1	99	2.10%
8.5.1FP5	98	2.08%
8.5.2FP4	97	2.06%
6.5.4	86	1.82%
8.0.2	85	1.80%
6.5.1	78	1.65%
6.5.3	75	1.59%
7.0	72	1.53%
8.0	66	1.40%
8.5.1FP4	58	1.23%
8.5.1FP3	55	1.17%
6.5.5	54	1.15%
6.5	52	1.10%
7.0.3FP1	52	1.10%
7.0.2FP2	49	1.04%
Other	715	15.16%
WinWebMail (3,726 servers)
Version	Number of Servers	Percent
3.8.1.3	767	20.59%
3.8.0.1	540	14.49%
3.7.6.1	426	11.43%
3.8.1.5	389	10.44%
3.7.3.1	294	7.89%
3.7.7.3	278	7.46%
3.8.1.1	275	7.38%
3.8.2.1	204	5.48%
3.7.1.1	143	3.84%
3.7.5.1	106	2.84%
3.6.3.1	69	1.85%
3.7.7.1	65	1.74%
3.7.0.5	54	1.45%
3.7.0.3	52	1.40%
3.7.0.7	45	1.21%
Other	19	0.51%
CommuniGate Pro (3,245 servers)
Version	Number of Servers	Percent
5.1.16	260	8.01%
5.4.5	197	6.07%
5.4.4	178	5.49%
4.1.8	142	4.38%
5.2.20	123	3.79%
5.4.1	98	3.02%
5.3.13	96	2.96%
5.4.6	91	2.80%
5.4.2	84	2.59%
4.2.10	81	2.50%
5.2.16	80	2.47%
5.4.3	68	2.10%
5.0.14	66	2.03%
5.2.3	65	2.00%
5.1.12	65	2.00%
5.2.19	62	1.91%
5.3.15	55	1.69%
5.2.14	54	1.66%
5.2.12	49	1.51%
5.4.0	48	1.48%
5.3.8	46	1.42%
5.3.9	44	1.36%
5.1.13	42	1.29%
5.3.12	41	1.26%
5.4	40	1.23%
5.2.13	37	1.14%
5.3.10	37	1.14%
Other	996	30.69%
XMail (2,265 servers)
Version	Number of Servers	Percent
1.27	559	24.68%
1.22	529	23.36%
1.25	410	18.10%
1.26	264	11.66%
1.24	201	8.87%
1.21	82	3.62%
1.23	53	2.34%
1.20	40	1.77%
1.17	32	1.41%
1.12	23	1.02%
Other	72	3.18%
Kerio (1,809 servers)
Version	Number of Servers	Percent
6.7.3	285	15.75%
6.6.2	179	9.89%
6.7.0	164	9.07%
6.5.0	134	7.41%
6.5.2	123	6.80%
6.7.2	105	5.80%
6.4.1	102	5.64%
6.7.1	91	5.03%
6.3.1	85	4.70%
6.4.0	71	3.92%
6.6.0	66	3.65%
6.5.1	63	3.48%
6.6.1	59	3.26%
6.4.2	38	2.10%
6.3.0	33	1.82%
6.2.0	23	1.27%
Other	188	10.39%
Qmail Toaster (1,635 servers)
Version	Number of Servers	Percent
1.3	1,554	95.05%
1.2	50	3.06%
Other	31	1.90%
Merak (1,358 servers)
Version	Number of Servers	Percent
8.0.3	544	40.06%
8.9.1	144	10.60%
8.5.0	98	7.22%
7.5.2	62	4.57%
7.6.4	58	4.27%
8.3.8	57	4.20%
7.4.5	51	3.76%
9.0.0	26	1.91%
7.4.2	25	1.84%
7.2.0	19	1.40%
8.2.4	19	1.40%
8.9.0	19	1.40%
7.6.1	18	1.33%
8.3.15	18	1.33%
6.2.1	17	1.25%
7.0.1	16	1.18%
4.4.2	16	1.18%
Other	151	11.12%
SurgeSMTP (1,077 servers)
Version	Number of Servers	Percent
5.3h2-2	193	17.92%
5.2a-1	120	11.14%
6.0a5-5	100	9.29%
3.9e-1	74	6.87%
6.0a4-4	71	6.59%
6.1c-1	51	4.74%
3.8k4-4	34	3.16%
4.0u4-4	28	2.60%
5.0e4-4	22	2.04%
4.2d2-2	20	1.86%
5.3h-1	20	1.86%
4.3g2-2	18	1.67%
3.8i3-3	17	1.58%
5.0e3-3	16	1.49%
4.2d4-4	14	1.30%
6.0a3-3	14	1.30%
3.7b8-8	13	1.21%
3.9c-1	13	1.21%
3.9h-18	13	1.21%
3.6f5-5	13	1.21%
4.3e-1	12	1.11%
Other	201	18.66%
ArGoSoft (835 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	199	23.83%
1.8 (1.8.9.5)	122	14.61%
1.8 (1.8.9.3)	105	12.57%
1.8 (1.8.9.1)	82	9.82%
1.8 (1.8.8.8)	55	6.59%
1.8 (1.8.8.7)	49	5.87%
1.8 (1.8.9.2)	34	4.07%
1.8 (1.8.9.4)	24	2.87%
1.8 (1.8.8.1)	15	1.80%
1.8 (1.8.6.0)	14	1.68%
1.8 (1.8.8.9)	14	1.68%
1.8 (1.8.9.0)	10	1.20%
Other	112	13.41%
GroupWise (576 servers)
Version	Number of Servers	Percent
8.0.2	128	22.22%
7.0.3	113	19.62%
6.5.7	63	10.94%
7.0.4	42	7.29%
7.0.2	38	6.60%
8.0.1	30	5.21%
7.0.1	23	3.99%
6.5.4	23	3.99%
6.5.6	20	3.47%
6.5.1	16	2.78%
6.0.4	15	2.60%
12.0.0	13	2.26%
8.0.0	9	1.56%
7.0	8	1.39%
6.5.5	8	1.39%
8.0.3	6	1.04%
Other	21	3.65%
Trend Micro (392 servers)
Version	Number of Servers	Percent
5.7	158	40.31%
5.5	99	25.26%
5.18	68	17.35%
7.0	37	9.44%
7.1	19	4.85%
Other	11	2.81%
Post.Office (388 servers)
Version	Number of Servers	Percent
3.5.3	56	14.43%
4.1.0.2	40	10.31%
4.0.1	29	7.47%
4.1.2.4	24	6.19%
3.9.2.3	17	4.38%
4.1.1	17	4.38%
3.5.3J	14	3.61%
3.9.2	12	3.09%
4.2	11	2.84%
3.8.3	11	2.84%
3.1.2	10	2.58%
4.1.0.3	10	2.58%
3.1.2J	10	2.58%
3.8.7.4	9	2.32%
4.0.1.1	8	2.06%
4.1.2.2	7	1.80%
4.1.2.3	7	1.80%
4.1.0.4	7	1.80%
3.9.1.2	6	1.55%
3.6.2	6	1.55%
3.9.1	6	1.55%
4.2.1.1	6	1.55%
3.9.1.3	5	1.29%
4.0.0.1	5	1.29%
4.2.1	5	1.29%
3.9.2.2	4	1.03%
4.1	4	1.03%
3.9.2.1	4	1.03%
3.5.1	4	1.03%
Other	34	8.76%
Gordano Messaging Suite (GMS) (367 servers)
Version	Number of Servers	Percent
Other	367	100.00%
MagicMail (324 servers)
Version	Number of Servers	Percent
Other	324	100.00%
Mirapoint (183 servers)
Version	Number of Servers	Percent
3.10.10a-GA	20	10.93%
4.2.3-GA	17	9.29%
4.1.10-GA	16	8.74%
3.10.5-GA	11	6.01%
4.1.9-GA	11	6.01%
3.8.4-GA	11	6.01%
4.1.3-GA	9	4.92%
3.10.9-GA	9	4.92%
3.10.8-GA	8	4.37%
3.8.3-GA	6	3.28%
3.10.7-GA	6	3.28%
3.8.5-GA	5	2.73%
4.3.3-GA	5	2.73%
4.2.4-GA	5	2.73%
3.8.6-GA	4	2.19%
4.1.4-GA	4	2.19%
4.1.8-GA	4	2.19%
3.10.4-GA	3	1.64%
3.8.7a	3	1.64%
3.7.5a-GA	3	1.64%
4.3.4-GA	3	1.64%
3.10.3-GA	3	1.64%
4.1.5-GA	3	1.64%
3.8.2-GA	2	1.09%
4.3.1a-FCS	2	1.09%
4.0.5a	2	1.09%
Other	8	4.37%
InterScan VirusWall (148 servers)
Version	Number of Servers	Percent
Other	148	100.00%
VisNetic (142 servers)
Version	Number of Servers	Percent
9.3.2.0	39	27.46%
9.1.4.1	18	12.68%
8.5.0.8	11	7.75%
5.8.6.6	8	5.63%
5.5.8.3	7	4.93%
8.0.3.1	6	4.23%
7.6.1.0	5	3.52%
8.0.3	5	3.52%
6.2.2.0	4	2.82%
8.0.3.0	4	2.82%
5.3.5.0	4	2.82%
7.2.4.1	4	2.82%
9.1.4.0	3	2.11%
5.0.2.3	3	2.11%
5.4.5.4	3	2.11%
8.3.5.0	2	1.41%
5.0.2.1	2	1.41%
Other	14	9.86%
Mercury (54 servers)
Version	Number of Servers	Percent
1.48	30	55.56%
3.32	14	25.93%
3.01a	2	3.70%
1.47	2	3.70%
3.21c	2	3.70%
3.21	1	1.85%
1.44	1	1.85%
4.x	1	1.85%
3.30	1	1.85%
Other	0	0.00%
Interscan (51 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	13	25.49%
3.81-Build_1022	9	17.65%
3.55 (build 1029)	6	11.76%
3.53 (build 2017)	4	7.84%
3.8-Build_3013	4	7.84%
3.53 (build 2011)	4	7.84%
3.53 (build 1493)	3	5.88%
3.53 (build 2013)	2	3.92%
3.81-Build_1084	2	3.92%
3.5 (build 1294)	1	1.96%
3.51 (build 1337)	1	1.96%
3.8-Build_3045	1	1.96%
3.8-Build_1080	1	1.96%
Other	0	0.00%
NetIQ MailMarshal (47 servers)
Version	Number of Servers	Percent
6.0.3.8	30	63.83%
5.5.6.7	5	10.64%
6.1.3.15	3	6.38%
5.5.6.5	2	4.26%
5.5.6.6	2	4.26%
5.5.5.6	1	2.13%
5.5.5.9	1	2.13%
5.5.4.17	1	2.13%
5.5.4.16	1	2.13%
5.5.3.17	1	2.13%
Other	0	0.00%
WebSTAR V (33 servers)
Version	Number of Servers	Percent
5.4.1	17	51.52%
5.4.0	9	27.27%
5.3.3	3	9.09%
5.3.2	2	6.06%
5.3.4	2	6.06%
Other	0	0.00%
Neon Mail Server (30 servers)
Version	Number of Servers	Percent
3.0.7	7	23.33%
3.1.3	5	16.67%
3.1.0	5	16.67%
3.1.4	4	13.33%
3.1.2	3	10.00%
3.0.9	2	6.67%
3.1.1	1	3.33%
3.0.8	1	3.33%
3.1.5	1	3.33%
3.0.6	1	3.33%
Other	0	0.00%
MessageWall (21 servers)
Version	Number of Servers	Percent
1.0.8	20	95.24%
1.0.6	1	4.76%
Other	0	0.00%
OpenSMTPD (21 servers)
Version	Number of Servers	Percent
Other	21	100.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	8	42.11%
7.3	5	26.32%
8.4	4	21.05%
6.1	1	5.26%
8.2	1	5.26%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (14 servers)
Version	Number of Servers	Percent
4.35.477.0	6	42.86%
4.35.480.0	2	14.29%
4.1.361.21	1	7.14%
3.2.315.0	1	7.14%
4.0.340.3	1	7.14%
4.3.459.0	1	7.14%
4.35.477.8	1	7.14%
3.1.302.0	1	7.14%
Other	0	0.00%
MAILsweeper (6 servers)
Version	Number of Servers	Percent
4.3.17.0	3	50.00%
4.3.19.0	2	33.33%
4.3.20.0	1	16.67%
Other	0	0.00%