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	2,130,425	100.0%
Number of Servers that didn't respond	340,678	15.99%
Server didn't open socket	328,728	15.43%
Server didn't provide banner	11,950	0.56%
Server provided banner	1,789,747	84.01%
Server banner identifies software in use	978,174	45.91%

As indicated by the above table, of the 2,130,425 servers queried, only 978,174 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	372,295	38.06%
Postfix	211,924	21.67%
Microsoft	155,100	15.86%
Sendmail	143,773	14.70%
MailEnable	31,118	3.18%
MDaemon	21,957	2.24%
IMail	11,491	1.17%
Lotus Domino	5,084	0.52%
WinWebMail	4,686	0.48%
CommuniGate Pro	3,618	0.37%
Kerio	3,387	0.35%
XMail	2,512	0.26%
Merak	2,226	0.23%
Qmail Toaster	1,735	0.18%
SurgeSMTP	1,302	0.13%
ArGoSoft	1,271	0.13%
GroupWise	1,140	0.12%
Trend Micro	735	0.08%
Gordano Messaging Suite (GMS)	504	0.05%
Post.Office	479	0.05%
MagicMail	451	0.05%
Mirapoint	340	0.03%
VisNetic	255	0.03%
InterScan VirusWall	244	0.02%
NetIQ MailMarshal	115	0.01%
Interscan	97	0.01%
Mercury	83	0.01%
WebSTAR V	67	0.01%
Neon Mail Server	56	0.01%
ModusMail	29	0.00%
MessageWall	28	0.00%
WebSTAR	26	0.00%
OpenVMS	25	0.00%
MAILsweeper	15	0.00%
OpenSMTPD	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (372,295 servers)
Version	Number of Servers	Percent
4.69	320,037	85.96%
4.67	14,508	3.90%
4.63	11,761	3.16%
4.72	8,783	2.36%
4.71	5,106	1.37%
Other	12,100	3.25%
Postfix (211,924 servers)
Version	Number of Servers	Percent
Other	211,924	100.00%
Microsoft (155,100 servers)
Version	Number of Servers	Percent
6.0.3790.4675	106,220	68.48%
6.0.3790.3959	33,325	21.49%
6.0.3790.1830	8,315	5.36%
5.0.2195.7381	2,275	1.47%
5.0.2195.6713	1,801	1.16%
Other	3,164	2.04%
Sendmail (143,773 servers)
Version	Number of Servers	Percent
8.13.8	28,416	19.76%
8.13.1	27,275	18.97%
8.14.4	16,145	11.23%
8.14.3	14,618	10.17%
8.12.11.20060308	8,550	5.95%
8.12.11.20060614	8,535	5.94%
8.13.6.20060614	5,541	3.85%
8.14.2	4,403	3.06%
8.12.10	4,252	2.96%
8.11.6	4,231	2.94%
8.13.6	3,486	2.42%
8.14.1	3,261	2.27%
8.12.11	2,473	1.72%
8.13.7	2,387	1.66%
8.13.4	2,299	1.60%
8.12.8	2,012	1.40%
Other	5,889	4.10%
MailEnable (31,118 servers)
Version	Number of Servers	Percent
1.986--	10,476	33.67%
1.981--	2,718	8.73%
1.983--	1,726	5.55%
3.62--	1,148	3.69%
0-3.63-	945	3.04%
4.23--	818	2.63%
4.26--	817	2.63%
4.22--	722	2.32%
0-4.26-	671	2.16%
1.96--	487	1.57%
1.95--	468	1.50%
4.26--4.26	465	1.49%
0-1.87-	446	1.43%
0-2.53-	431	1.39%
--3.63	383	1.23%
0-4.23-	373	1.20%
4.14--	354	1.14%
1.9--	353	1.13%
4.17--	325	1.04%
0-3.61-	316	1.02%
Other	6,676	21.45%
MDaemon (21,957 servers)
Version	Number of Servers	Percent
11.0.3	5,985	27.26%
10.1.2	1,535	6.99%
10.0.0	1,207	5.50%
11.0.0	1,078	4.91%
10.1.1	1,020	4.65%
9.6.1	771	3.51%
9.6.6	728	3.32%
10.1.0	625	2.85%
9.6.5	505	2.30%
10.0.5	505	2.30%
9.5.2	490	2.23%
11.0.2	465	2.12%
10.0.2	442	2.01%
10.0.4	407	1.85%
9.5.1	400	1.82%
9.6.2	393	1.79%
8.1.3	374	1.70%
9.6.4	373	1.70%
9.5.6	369	1.68%
11.0.1	346	1.58%
9.0.4	336	1.53%
9.6.3	236	1.07%
6.8.5	224	1.02%
9.5.5	222	1.01%
Other	2,921	13.30%
IMail (11,491 servers)
Version	Number of Servers	Percent
8.22	2,233	19.43%
11.02	1,156	10.06%
8.15	922	8.02%
9.23	809	7.04%
11.01	742	6.46%
8.05	503	4.38%
9.20	498	4.33%
9.10	484	4.21%
11.0	427	3.72%
10.02	414	3.60%
11.03	364	3.17%
7.07	331	2.88%
9.21	327	2.85%
7.15	278	2.42%
8.00	253	2.20%
6.06	229	1.99%
10.01	170	1.48%
8.04	163	1.42%
8.10	126	1.10%
Other	1,062	9.24%
Lotus Domino (5,084 servers)
Version	Number of Servers	Percent
8.5.2	534	10.50%
8.5.1	529	10.41%
8.5	344	6.77%
7.0.2	321	6.31%
8.5.1FP3	203	3.99%
7.0.3	197	3.87%
7.0.1	182	3.58%
8.0.2	171	3.36%
8.0.1	171	3.36%
6.5.1	147	2.89%
6.5.4	146	2.87%
8.5.1FP2	132	2.60%
6.5.3	132	2.60%
7.0.3FP1	118	2.32%
8.5.1FP4	115	2.26%
7.0	108	2.12%
8.0	107	2.10%
6.5.5	106	2.08%
7.0.2FP2	99	1.95%
6.5	82	1.61%
8.5.1FP1	79	1.55%
8.5FP1	71	1.40%
5.0.11	62	1.22%
Other	928	18.25%
WinWebMail (4,686 servers)
Version	Number of Servers	Percent
3.8.0.1	1,058	22.58%
3.7.6.1	738	15.75%
3.7.3.1	557	11.89%
3.7.7.3	542	11.57%
3.8.1.1	469	10.01%
3.8.1.3	327	6.98%
3.7.1.1	245	5.23%
3.7.5.1	167	3.56%
3.7.7.1	145	3.09%
3.6.3.1	126	2.69%
3.7.0.5	116	2.48%
3.7.0.3	89	1.90%
3.7.0.7	77	1.64%
Other	30	0.64%
CommuniGate Pro (3,618 servers)
Version	Number of Servers	Percent
5.1.16	234	6.47%
4.1.8	194	5.36%
5.3.10	192	5.31%
5.2.16	162	4.48%
5.3.8	159	4.39%
5.3.9	148	4.09%
4.2.10	119	3.29%
5.2.19	103	2.85%
5.2.20	95	2.63%
5.1.12	89	2.46%
5.2.3	84	2.32%
5.3.5	81	2.24%
5.3.7	79	2.18%
5.2.14	77	2.13%
5.2.12	76	2.10%
5.0.14	71	1.96%
5.3.2	65	1.80%
5.1.13	63	1.74%
5.2.8	59	1.63%
5.2.13	54	1.49%
5.2.10	53	1.46%
5.2.18	49	1.35%
5.1.14	44	1.22%
5.0.9	41	1.13%
5.2.0	39	1.08%
5.2.11	38	1.05%
5.3.4	37	1.02%
Other	1,113	30.76%
Kerio (3,387 servers)
Version	Number of Servers	Percent
6.7.3	473	13.97%
6.6.2	379	11.19%
6.7.0	361	10.66%
6.7.2	275	8.12%
6.5.0	230	6.79%
6.5.2	191	5.64%
6.7.1	184	5.43%
6.4.1	171	5.05%
6.3.1	163	4.81%
6.5.1	114	3.37%
6.4.0	114	3.37%
6.6.0	114	3.37%
6.6.1	87	2.57%
6.4.2	86	2.54%
6.3.0	68	2.01%
6.1.3	37	1.09%
Other	340	10.04%
XMail (2,512 servers)
Version	Number of Servers	Percent
1.22	589	23.45%
1.25	582	23.17%
1.26	339	13.50%
1.24	310	12.34%
1.27	237	9.43%
1.21	117	4.66%
1.23	65	2.59%
1.20	62	2.47%
1.17	50	1.99%
1.12	49	1.95%
Other	112	4.46%
Merak (2,226 servers)
Version	Number of Servers	Percent
8.0.3	914	41.06%
8.9.1	216	9.70%
8.5.0	153	6.87%
7.5.2	107	4.81%
7.4.5	103	4.63%
7.6.4	90	4.04%
8.3.8	83	3.73%
8.2.13	45	2.02%
9.0.0	33	1.48%
7.4.2	33	1.48%
8.3.15	30	1.35%
7.2.0	29	1.30%
7.6.1	29	1.30%
8.9.0	27	1.21%
8.2.4	25	1.12%
Other	309	13.88%
Qmail Toaster (1,735 servers)
Version	Number of Servers	Percent
1.3	1,596	91.99%
1.2	99	5.71%
1.0	29	1.67%
Other	11	0.63%
SurgeSMTP (1,302 servers)
Version	Number of Servers	Percent
5.0e4-4	211	16.21%
4.2d4-4	149	11.44%
3.9e-1	125	9.60%
5.1c-1	63	4.84%
3.8k4-4	58	4.45%
4.3g2-2	55	4.22%
5.0e3-3	54	4.15%
4.0u4-4	52	3.99%
4.3e-1	44	3.38%
4.3g4-4	43	3.30%
4.2d2-2	41	3.15%
3.8i3-3	31	2.38%
3.7b8-8	26	2.00%
3.8f3-3	24	1.84%
4.2a3-3	22	1.69%
3.9c-1	20	1.54%
3.6f5-5	20	1.54%
3.9g2-2	14	1.08%
3.9h-18	14	1.08%
Other	236	18.13%
ArGoSoft (1,271 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	271	21.32%
1.8 (1.8.9.5)	197	15.50%
1.8 (1.8.9.3)	163	12.82%
1.8 (1.8.9.1)	121	9.52%
1.8 (1.8.8.8)	100	7.87%
1.8 (1.8.8.7)	73	5.74%
1.8 (1.8.9.2)	54	4.25%
1.8 (1.8.9.4)	39	3.07%
1.8 (1.8.8.1)	25	1.97%
1.8 (1.8.8.9)	23	1.81%
1.8 (1.8.9.0)	17	1.34%
1.8 (1.8.6.0)	17	1.34%
1.8 (1.8.8.2)	14	1.10%
Other	157	12.35%
GroupWise (1,140 servers)
Version	Number of Servers	Percent
7.0.3	294	25.79%
8.0.2	142	12.46%
6.5.7	131	11.49%
7.0.2	107	9.39%
8.0.1	95	8.33%
7.0.1	59	5.18%
6.5.4	57	5.00%
6.5.6	48	4.21%
7.0.4	34	2.98%
6.5.1	33	2.89%
8.0.0	30	2.63%
6.0.4	30	2.63%
7.0	17	1.49%
6.5.5	16	1.40%
Other	47	4.12%
Trend Micro (735 servers)
Version	Number of Servers	Percent
5.7	314	42.72%
5.5	203	27.62%
5.18	123	16.73%
7.0	63	8.57%
7.1	14	1.90%
7	8	1.09%
Other	10	1.36%
Gordano Messaging Suite (GMS) (504 servers)
Version	Number of Servers	Percent
Other	504	100.00%
Post.Office (479 servers)
Version	Number of Servers	Percent
3.5.3	80	16.70%
4.1.0.2	51	10.65%
4.0.1	42	8.77%
3.5.3J	26	5.43%
4.1.1	25	5.22%
3.8.3	22	4.59%
4.1.0.4	15	3.13%
3.9.2.3	14	2.92%
3.1.2J	14	2.92%
3.9.2	13	2.71%
3.9.1	13	2.71%
4.1.2.2	13	2.71%
3.1.2	11	2.30%
4.0.1.1	10	2.09%
3.6.2	10	2.09%
3.8.7.4	10	2.09%
4.1.0.3	9	1.88%
4.0.0.2	9	1.88%
3.6.3	8	1.67%
4.1	7	1.46%
3.9.2.1	7	1.46%
3.5.2	7	1.46%
3.9.1.3	6	1.25%
3.9.0	5	1.04%
3.9.1.2	5	1.04%
4.0.0.1	5	1.04%
Other	42	8.77%
MagicMail (451 servers)
Version	Number of Servers	Percent
Other	451	100.00%
Mirapoint (340 servers)
Version	Number of Servers	Percent
3.8.4-GA	31	9.12%
3.10.8-GA	29	8.53%
3.10.5-GA	28	8.24%
3.8.3-GA	27	7.94%
3.10.9-GA	23	6.76%
3.10.7-GA	22	6.47%
4.1.9-GA	18	5.29%
4.1.3-GA	17	5.00%
3.10.10a-GA	13	3.82%
3.10.6-GA	13	3.82%
4.1.8-GA	13	3.82%
3.10.4-GA	11	3.24%
3.10.3-GA	10	2.94%
4.1.10-GA	10	2.94%
3.8.5-GA	9	2.65%
4.1.4-GA	8	2.35%
3.8.7a	8	2.35%
3.8.6-GA	7	2.06%
3.8.2-GA	6	1.76%
3.7.3a-GA	5	1.47%
3.7.5a-GA	5	1.47%
4.0.5a	4	1.18%
4.1.5-GA	4	1.18%
Other	19	5.59%
VisNetic (255 servers)
Version	Number of Servers	Percent
9.3.2.0	90	35.29%
9.1.4.1	39	15.29%
5.8.6.6	12	4.71%
8.5.0.8	12	4.71%
5.5.8.3	10	3.92%
8.0.3.1	8	3.14%
6.2.2.0	7	2.75%
8.0.3	7	2.75%
7.6.1.0	7	2.75%
8.3.5.0	6	2.35%
8.0.3.0	6	2.35%
5.3.5.0	5	1.96%
9.1.4.0	5	1.96%
7.2.4.1	5	1.96%
5.4.5.4	5	1.96%
8.3.6	4	1.57%
5.0.2.3	4	1.57%
7.5.3.0	3	1.18%
5.0.2.1	3	1.18%
Other	17	6.67%
InterScan VirusWall (244 servers)
Version	Number of Servers	Percent
Other	244	100.00%
NetIQ MailMarshal (115 servers)
Version	Number of Servers	Percent
6.0.3.8	82	71.30%
5.5.6.7	9	7.83%
6.1.3.15	8	6.96%
5.5.6.6	4	3.48%
5.5.4.16	3	2.61%
5.5.6.5	2	1.74%
Other	7	6.09%
Interscan (97 servers)
Version	Number of Servers	Percent
3.81-Build_1022	16	16.49%
3.55 (build 1016)	15	15.46%
3.55 (build 1029)	11	11.34%
3.53 (build 2017)	10	10.31%
3.8-Build_3013	7	7.22%
3.81-Build_1084	7	7.22%
3.53 (build 1493)	4	4.12%
3.55 (build 1020)	4	4.12%
3.52 (build 1375)	4	4.12%
3.53 (build 2011)	3	3.09%
3.53 (build 1494)	2	2.06%
3.53 (build 2013)	2	2.06%
3.8-Build_1080	2	2.06%
3.81-Build_1055	1	1.03%
3.61-Build_1014	1	1.03%
3.51 (build 1321)	1	1.03%
3.8-Build_3065	1	1.03%
3.6-Build_3013	1	1.03%
3.6-Build_1273	1	1.03%
3.6-Build_1246	1	1.03%
3.81-Build_1032	1	1.03%
3.8-Build_3045	1	1.03%
3.6-Build_1207	1	1.03%
Other	0	0.00%
Mercury (83 servers)
Version	Number of Servers	Percent
1.48	47	56.63%
3.32	19	22.89%
3.21c	7	8.43%
3.01a	2	2.41%
1.47	2	2.41%
3.30	2	2.41%
3.21	1	1.20%
1.44	1	1.20%
3.31	1	1.20%
1.49	1	1.20%
Other	0	0.00%
WebSTAR V (67 servers)
Version	Number of Servers	Percent
5.4.1	26	38.81%
5.4.0	15	22.39%
5.3.4	13	19.40%
5.3.2	6	8.96%
5.3.3	5	7.46%
5.3.0	1	1.49%
5.3.1	1	1.49%
Other	0	0.00%
Neon Mail Server (56 servers)
Version	Number of Servers	Percent
3.1.3	14	25.00%
3.0.7	14	25.00%
3.0.9	8	14.29%
3.1.4	6	10.71%
3.1.2	4	7.14%
3.1.0	4	7.14%
3.1.5	3	5.36%
3.1.1	2	3.57%
3.0.6	1	1.79%
Other	0	0.00%
ModusMail (29 servers)
Version	Number of Servers	Percent
4.35.477.0	8	27.59%
4.2.420.0	5	17.24%
4.35.480.0	3	10.34%
4.1.361.21	2	6.90%
3.1.293.1	2	6.90%
3.1.302.0	2	6.90%
4.35.480.11	2	6.90%
4.2.425.22	1	3.45%
3.2.315.0	1	3.45%
4.0.340.3	1	3.45%
4.3.459.0	1	3.45%
4.35.477.8	1	3.45%
Other	0	0.00%
MessageWall (28 servers)
Version	Number of Servers	Percent
1.0.8	26	92.86%
1.0.6	1	3.57%
1.1.0	1	3.57%
Other	0	0.00%
WebSTAR (26 servers)
Version	Number of Servers	Percent
Other	26	100.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	12	48.00%
7.3	7	28.00%
8.4	2	8.00%
8.2	2	8.00%
6.1	1	4.00%
7.2	1	4.00%
Other	0	0.00%
MAILsweeper (15 servers)
Version	Number of Servers	Percent
4.3.17.0	4	26.67%
4.3.14.0	4	26.67%
4.3.20.0	2	13.33%
4.3.19.0	1	6.67%
4.3.10.0	1	6.67%
4.3.1.0	1	6.67%
4.3.6.0	1	6.67%
4.2.5.0	1	6.67%
Other	0	0.00%
OpenSMTPD (6 servers)
Version	Number of Servers	Percent
Other	6	100.00%