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	1,739,422	100.0%
Number of Servers that didn't respond	276,594	15.90%
Server didn't open socket	265,956	15.29%
Server didn't provide banner	10,638	0.61%
Server provided banner	1,462,828	84.10%
Server banner identifies software in use	839,601	48.27%

As indicated by the above table, of the 1,739,422 servers queried, only 839,601 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	219,959	26.20%
Sendmail	190,813	22.73%
Microsoft	174,916	20.83%
Postfix	150,037	17.87%
MailEnable	24,625	2.93%
MDaemon	20,920	2.49%
IMail	17,551	2.09%
Kerio	5,641	0.67%
Lotus Domino	5,487	0.65%
WinWebMail	4,826	0.57%
Merak	4,408	0.53%
CommuniGate Pro	4,197	0.50%
XMail	2,495	0.30%
GroupWise	2,089	0.25%
ArGoSoft	2,048	0.24%
Trend Micro	1,929	0.23%
Qmail Toaster	1,646	0.20%
SurgeSMTP	1,476	0.18%
Gordano Messaging Suite (GMS)	721	0.09%
Post.Office	709	0.08%
Mirapoint	507	0.06%
InterScan VirusWall	456	0.05%
VisNetic	425	0.05%
MagicMail	380	0.05%
NetIQ MailMarshal	349	0.04%
Interscan	303	0.04%
Neon Mail Server	153	0.02%
WebSTAR V	132	0.02%
Mercury	128	0.02%
ModusMail	82	0.01%
MessageWall	64	0.01%
WebSTAR	60	0.01%
MAILsweeper	49	0.01%
OpenVMS	20	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (219,959 servers)
Version	Number of Servers	Percent
4.69	154,381	70.19%
4.63	21,146	9.61%
4.68	14,106	6.41%
4.67	9,190	4.18%
4.66	4,305	1.96%
4.60	4,208	1.91%
4.50	3,610	1.64%
4.62	2,968	1.35%
Other	6,045	2.75%
Sendmail (190,813 servers)
Version	Number of Servers	Percent
8.13.1	32,058	16.80%
8.12.11.20060614	19,834	10.39%
8.13.8	18,426	9.66%
8.13.6	18,225	9.55%
8.12.11.20060308	16,772	8.79%
8.11.6	11,885	6.23%
8.13.6.20060614	10,437	5.47%
8.12.10	9,523	4.99%
8.12.11	8,719	4.57%
8.14.1	7,859	4.12%
8.14.2	6,036	3.16%
8.14.3	5,515	2.89%
8.13.4	5,038	2.64%
8.13.7	4,266	2.24%
8.12.8	4,077	2.14%
8.9.3	2,365	1.24%
Other	9,778	5.12%
Microsoft (174,916 servers)
Version	Number of Servers	Percent
6.0.3790.3959	133,256	76.18%
6.0.3790.1830	24,671	14.10%
5.0.2195.6713	11,144	6.37%
6.0.3790.211	3,015	1.72%
Other	2,830	1.62%
Postfix (150,037 servers)
Version	Number of Servers	Percent
Other	150,037	100.00%
MailEnable (24,625 servers)
Version	Number of Servers	Percent
1.981--	5,021	20.39%
1.986--	3,615	14.68%
1.983--	3,136	12.74%
1.96--	1,181	4.80%
1.95--	1,095	4.45%
1.9--	874	3.55%
1.8--	662	2.69%
0-3.14-	593	2.41%
0-2.37-	588	2.39%
0-3.53-	522	2.12%
0-3.6-	467	1.90%
0-1.85-	460	1.87%
--3.6	356	1.45%
0--3.53	340	1.38%
0-2.52-	327	1.33%
0-1.87-	291	1.18%
0-2.38-	289	1.17%
0-2.36-	248	1.01%
Other	4,560	18.52%
MDaemon (20,920 servers)
Version	Number of Servers	Percent
10.0.2	2,644	12.64%
9.6.6	1,724	8.24%
10.0.1	1,599	7.64%
9.6.5	1,372	6.56%
9.6.1	1,325	6.33%
10.0.0	1,190	5.69%
9.6.4	869	4.15%
9.5.2	751	3.59%
9.6.2	751	3.59%
8.1.3	734	3.51%
9.5.6	686	3.28%
9.0.4	647	3.09%
9.5.1	569	2.72%
9.6.3	453	2.17%
7.2.3	407	1.95%
6.8.5	403	1.93%
9.0.1	342	1.63%
7.2.0	320	1.53%
9.0.0	273	1.30%
9.5.5	265	1.27%
8.1.4	240	1.15%
8.0.2	231	1.10%
8.1.1	219	1.05%
Other	2,906	13.89%
IMail (17,551 servers)
Version	Number of Servers	Percent
8.22	3,753	21.38%
8.15	2,095	11.94%
9.23	1,488	8.48%
10.01	1,202	6.85%
8.05	1,039	5.92%
9.10	950	5.41%
10.02	678	3.86%
7.07	673	3.83%
9.21	587	3.34%
7.15	508	2.89%
10.0	471	2.68%
6.06	460	2.62%
8.00	380	2.17%
8.21	361	2.06%
8.04	341	1.94%
9.22	318	1.81%
9.20	316	1.80%
8.01	236	1.34%
8.10	221	1.26%
8.20	183	1.04%
Other	1,291	7.36%
Kerio (5,641 servers)
Version	Number of Servers	Percent
6.5.2	1,008	17.87%
6.6.0	854	15.14%
6.6.1	633	11.22%
6.5.0	601	10.65%
6.5.1	454	8.05%
6.4.1	411	7.29%
6.3.1	367	6.51%
6.4.2	244	4.33%
6.4.0	232	4.11%
6.3.0	149	2.64%
6.1.3	62	1.10%
6.1.0	59	1.05%
Other	567	10.05%
Lotus Domino (5,487 servers)
Version	Number of Servers	Percent
7.0.2	565	10.30%
8.0.1	509	9.28%
8.0.2	447	8.15%
7.0.3	359	6.54%
6.5.4	303	5.52%
7.0.1	295	5.38%
6.5.1	250	4.56%
7.0.2FP2	244	4.45%
6.5.3	218	3.97%
7.0	196	3.57%
6.5.5	191	3.48%
7.0.3FP1	186	3.39%
8.0	182	3.32%
6.5	151	2.75%
7.0.2FP1	102	1.86%
5.0.11	94	1.71%
6.5.2	87	1.59%
7.0.2FP3	68	1.24%
5.0.12	68	1.24%
6.5.6	64	1.17%
5.0.13a	58	1.06%
Other	850	15.49%
WinWebMail (4,826 servers)
Version	Number of Servers	Percent
3.7.6.1	1,212	25.11%
3.7.3.1	1,071	22.19%
3.7.1.1	595	12.33%
3.7.7.3	443	9.18%
3.6.3.1	326	6.76%
3.7.5.1	321	6.65%
3.7.0.5	268	5.55%
3.7.7.1	220	4.56%
3.7.0.7	165	3.42%
3.7.0.3	163	3.38%
Other	42	0.87%
Merak (4,408 servers)
Version	Number of Servers	Percent
8.0.3	1,780	40.38%
8.9.1	426	9.66%
8.5.0	276	6.26%
7.4.5	215	4.88%
7.6.4	205	4.65%
7.5.2	198	4.49%
8.3.8	189	4.29%
7.4.2	93	2.11%
9.0.0	85	1.93%
7.6.1	68	1.54%
7.2.0	64	1.45%
6.2.1	56	1.27%
8.2.4	56	1.27%
8.2.13	50	1.13%
8.9.0	47	1.07%
Other	600	13.61%
CommuniGate Pro (4,197 servers)
Version	Number of Servers	Percent
4.1.8	357	8.51%
5.2.10	262	6.24%
5.1.13	224	5.34%
4.2.10	210	5.00%
5.2.8	198	4.72%
5.1.12	158	3.76%
5.1.16	157	3.74%
5.2.9	139	3.31%
5.2.6	126	3.00%
5.2.3	121	2.88%
5.1.14	119	2.84%
5.2.5	104	2.48%
5.2.0	100	2.38%
5.0.13	94	2.24%
5.0.9	93	2.22%
5.0.14	80	1.91%
5.1.7	73	1.74%
5.1.9	71	1.69%
5.1.10	64	1.52%
5.2.7	59	1.41%
5.1.8	57	1.36%
4.2.8	55	1.31%
5.1.11	52	1.24%
4.2	51	1.22%
5.0.8	46	1.10%
5.2.1	46	1.10%
4.2.7	46	1.10%
4.2.9	46	1.10%
4.3.12	43	1.02%
Other	946	22.54%
XMail (2,495 servers)
Version	Number of Servers	Percent
1.22	717	28.74%
1.25	590	23.65%
1.24	465	18.64%
1.21	211	8.46%
1.17	115	4.61%
1.23	100	4.01%
1.20	99	3.97%
1.12	64	2.57%
1.16	32	1.28%
Other	102	4.09%
GroupWise (2,089 servers)
Version	Number of Servers	Percent
7.0.3	656	31.40%
7.0.2	381	18.24%
6.5.7	237	11.35%
7.0.1	177	8.47%
6.5.4	138	6.61%
6.5.6	98	4.69%
6.0.4	85	4.07%
6.5.1	58	2.78%
6.5.5	56	2.68%
7.0	50	2.39%
8.0.0	25	1.20%
6.5.2	22	1.05%
Other	106	5.07%
ArGoSoft (2,048 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	492	24.02%
1.8 (1.8.9.3)	321	15.67%
1.8 (1.8.9.1)	239	11.67%
1.8 (1.8.8.7)	163	7.96%
1.8 (1.8.8.8)	159	7.76%
1.8 (1.8.9.2)	99	4.83%
1.8 (1.8.8.9)	55	2.69%
1.8 (1.8.9.4)	53	2.59%
1.8 (1.8.8.1)	41	2.00%
1.8 (1.8.9.0)	37	1.81%
1.8 (1.8.6.0)	28	1.37%
1.8 (1.8.8.2)	28	1.37%
1.8 (1.8.5.9)	22	1.07%
Other	311	15.19%
Trend Micro (1,929 servers)
Version	Number of Servers	Percent
5.7	892	46.24%
5.5	628	32.56%
5.18	281	14.57%
7.0	92	4.77%
Other	36	1.87%
Qmail Toaster (1,646 servers)
Version	Number of Servers	Percent
1.3	1,351	82.08%
1.2	229	13.91%
1.0	45	2.73%
1.5	18	1.09%
Other	3	0.18%
SurgeSMTP (1,476 servers)
Version	Number of Servers	Percent
3.9e-1	467	31.64%
3.8k4-4	154	10.43%
3.9c-1	150	10.16%
3.9g2-2	134	9.08%
3.8f3-3	74	5.01%
3.7b8-8	64	4.34%
3.8i3-3	56	3.79%
3.6f5-5	49	3.32%
3.5b3-3	42	2.85%
3.8f2-2	36	2.44%
3.0c2-2	26	1.76%
3.8k2-2	15	1.02%
Other	209	14.16%
Gordano Messaging Suite (GMS) (721 servers)
Version	Number of Servers	Percent
Other	721	100.00%
Post.Office (709 servers)
Version	Number of Servers	Percent
3.5.3	160	22.57%
4.0.1	65	9.17%
4.1.0.2	53	7.48%
3.5.3J	52	7.33%
3.8.3	38	5.36%
3.6.3	27	3.81%
3.9.2.3	25	3.53%
3.9.1	25	3.53%
3.6.2	22	3.10%
3.1.2J	21	2.96%
3.8.7.4	20	2.82%
3.1.2	19	2.68%
3.9.2	18	2.54%
3.9.0	15	2.12%
4.1	13	1.83%
3.8.4	12	1.69%
3.5.2	11	1.55%
3.9.2.1	10	1.41%
4.0.0.2	10	1.41%
4.0.0.1	9	1.27%
3.9.1.3	8	1.13%
3.6.0	8	1.13%
Other	68	9.59%
Mirapoint (507 servers)
Version	Number of Servers	Percent
3.8.4-GA	89	17.55%
3.8.3-GA	73	14.40%
3.8.6-GA	49	9.66%
3.8.7a	45	8.88%
3.10.3-GA	37	7.30%
3.7.5a-GA	33	6.51%
3.8.5-GA	32	6.31%
3.8.2-GA	23	4.54%
3.7.3a-GA	22	4.34%
3.10.2-GA	19	3.75%
3.7.4b-GA	16	3.16%
4.0.5a	14	2.76%
4.1.3-GA	10	1.97%
Other	45	8.88%
InterScan VirusWall (456 servers)
Version	Number of Servers	Percent
Other	456	100.00%
VisNetic (425 servers)
Version	Number of Servers	Percent
9.1.4.1	91	21.41%
9.3.2.0	53	12.47%
5.8.6.6	24	5.65%
7.2.4.1	23	5.41%
9.1.4.0	21	4.94%
8.5.0.8	20	4.71%
8.3.5.0	18	4.24%
6.2.2.0	17	4.00%
5.0.2.3	15	3.53%
8.0.3.0	15	3.53%
8.0.3.1	14	3.29%
5.5.8.3	13	3.06%
8.0.3	13	3.06%
7.6.1.0	10	2.35%
8.3.6	9	2.12%
5.3.5.0	9	2.12%
5.8.6.4	7	1.65%
5.4.5.4	7	1.65%
6.0.9.0	5	1.18%
Other	41	9.65%
MagicMail (380 servers)
Version	Number of Servers	Percent
Other	380	100.00%
NetIQ MailMarshal (349 servers)
Version	Number of Servers	Percent
6.0.3.8	269	77.08%
5.5.6.7	24	6.88%
6.1.3.15	19	5.44%
5.5.6.6	9	2.58%
5.5.4.16	6	1.72%
5.5.6.5	4	1.15%
5.5.5.9	4	1.15%
5.5.5.6	4	1.15%
Other	10	2.87%
Interscan (303 servers)
Version	Number of Servers	Percent
3.8-Build_3013	52	17.16%
3.55 (build 1016)	49	16.17%
3.81-Build_1022	44	14.52%
3.55 (build 1029)	30	9.90%
3.53 (build 2017)	23	7.59%
3.53 (build 2011)	17	5.61%
3.53 (build 1493)	16	5.28%
3.55 (build 1020)	13	4.29%
3.81-Build_1084	11	3.63%
3.53 (build 2013)	11	3.63%
3.52 (build 1375)	8	2.64%
Other	29	9.57%
Neon Mail Server (153 servers)
Version	Number of Servers	Percent
3.1.3	46	30.07%
3.0.7	29	18.95%
3.0.9	26	16.99%
3.1.0	18	11.76%
3.1.2	15	9.80%
3.1.4	7	4.58%
3.0.8	4	2.61%
3.1.1	3	1.96%
3.0.6	3	1.96%
3.0.5	2	1.31%
Other	0	0.00%
WebSTAR V (132 servers)
Version	Number of Servers	Percent
5.4.1	40	30.30%
5.4.0	32	24.24%
5.3.4	31	23.48%
5.3.3	14	10.61%
5.3.2	12	9.09%
5.3.1	2	1.52%
Other	1	0.76%
Mercury (128 servers)
Version	Number of Servers	Percent
1.48	57	44.53%
3.32	43	33.59%
3.21c	11	8.59%
3.31	5	3.91%
1.47	4	3.12%
1.44	2	1.56%
3.21	2	1.56%
3.01a	2	1.56%
Other	2	1.56%
ModusMail (82 servers)
Version	Number of Servers	Percent
3.2.315.0	17	20.73%
4.35.480.0	15	18.29%
4.35.477.0	10	12.20%
4.35.480.11	8	9.76%
4.3.459.0	8	9.76%
3.1.302.0	7	8.54%
4.1.361.21	3	3.66%
4.2.420.0	2	2.44%
4.1.361.0	2	2.44%
3.1.293.1	2	2.44%
4.2.425.22	1	1.22%
4.35.480	1	1.22%
4.2.425.4	1	1.22%
4.0.340.3	1	1.22%
3.0.273.0	1	1.22%
4.0.330.8	1	1.22%
1.4.232.0	1	1.22%
4.35.477.8	1	1.22%
Other	0	0.00%
MessageWall (64 servers)
Version	Number of Servers	Percent
1.0.8	47	73.44%
1.0.11	14	21.88%
1.1.0	2	3.12%
1.0.6	1	1.56%
Other	0	0.00%
WebSTAR (60 servers)
Version	Number of Servers	Percent
Other	60	100.00%
MAILsweeper (49 servers)
Version	Number of Servers	Percent
4.3.20.0	16	32.65%
4.3.14.0	8	16.33%
4.3.17.0	7	14.29%
4.2.10.0	5	10.20%
4.3.1.0	5	10.20%
4.3.19.0	4	8.16%
4.3.6.0	1	2.04%
4.2.5.0	1	2.04%
4.1.5.0	1	2.04%
4.3.10.0	1	2.04%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	11	55.00%
7.3	6	30.00%
8.2	2	10.00%
6.1	1	5.00%
Other	0	0.00%