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	2,018,183	100.0%
Number of Servers that didn't respond	330,492	16.38%
Server didn't open socket	317,936	15.75%
Server didn't provide banner	12,556	0.62%
Server provided banner	1,687,691	83.62%
Server banner identifies software in use	943,521	46.75%

As indicated by the above table, of the 2,018,183 servers queried, only 943,521 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	277,452	29.41%
Microsoft	190,404	20.18%
Sendmail	183,211	19.42%
Postfix	183,060	19.40%
MailEnable	28,566	3.03%
MDaemon	23,219	2.46%
IMail	16,160	1.71%
Kerio	7,232	0.77%
Lotus Domino	5,806	0.62%
WinWebMail	5,515	0.58%
CommuniGate Pro	4,161	0.44%
Merak	3,562	0.38%
XMail	2,701	0.29%
Qmail Toaster	1,839	0.19%
ArGoSoft	1,794	0.19%
GroupWise	1,752	0.19%
SurgeSMTP	1,510	0.16%
Trend Micro	1,474	0.16%
Gordano Messaging Suite (GMS)	739	0.08%
Post.Office	651	0.07%
Mirapoint	458	0.05%
VisNetic	403	0.04%
MagicMail	399	0.04%
InterScan VirusWall	396	0.04%
NetIQ MailMarshal	246	0.03%
Interscan	236	0.03%
Neon Mail Server	125	0.01%
WebSTAR V	124	0.01%
Mercury	114	0.01%
ModusMail	53	0.01%
MessageWall	52	0.01%
WebSTAR	44	0.00%
MAILsweeper	37	0.00%
OpenVMS	26	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (277,452 servers)
Version	Number of Servers	Percent
4.69	228,222	82.26%
4.63	15,255	5.50%
4.67	13,227	4.77%
4.66	4,308	1.55%
4.68	3,637	1.31%
4.60	3,260	1.17%
Other	9,543	3.44%
Microsoft (190,404 servers)
Version	Number of Servers	Percent
6.0.3790.3959	159,682	83.86%
6.0.3790.1830	17,738	9.32%
5.0.2195.6713	8,601	4.52%
Other	4,383	2.30%
Sendmail (183,211 servers)
Version	Number of Servers	Percent
8.13.1	34,886	19.04%
8.13.8	22,954	12.53%
8.14.3	17,517	9.56%
8.12.11.20060614	16,145	8.81%
8.12.11.20060308	15,994	8.73%
8.13.6	12,497	6.82%
8.13.6.20060614	10,695	5.84%
8.12.10	7,515	4.10%
8.11.6	7,074	3.86%
8.14.1	6,320	3.45%
8.14.2	6,152	3.36%
8.12.11	4,986	2.72%
8.13.4	4,010	2.19%
8.13.7	3,398	1.85%
8.12.8	3,266	1.78%
8.9.3	2,030	1.11%
Other	7,772	4.24%
Postfix (183,060 servers)
Version	Number of Servers	Percent
Other	183,060	100.00%
MailEnable (28,566 servers)
Version	Number of Servers	Percent
1.986--	7,141	25.00%
1.981--	4,319	15.12%
1.983--	2,808	9.83%
3.62--	1,801	6.30%
1.95--	850	2.98%
1.96--	845	2.96%
1.9--	692	2.42%
0-3.61-	691	2.42%
0-3.6-	621	2.17%
0-3.62-	505	1.77%
1.8--	496	1.74%
0-2.53-	478	1.67%
0-3.14-	413	1.45%
0-2.37-	407	1.42%
0-1.87-	397	1.39%
--3.61	359	1.26%
0-3.63-	342	1.20%
0-1.85-	332	1.16%
--3.63	315	1.10%
Other	4,754	16.64%
MDaemon (23,219 servers)
Version	Number of Servers	Percent
10.1.1	4,545	19.57%
10.0.5	1,670	7.19%
10.0.0	1,431	6.16%
9.6.1	1,168	5.03%
9.6.6	1,085	4.67%
10.0.4	1,075	4.63%
10.1.0	863	3.72%
9.6.5	845	3.64%
9.5.2	754	3.25%
10.0.2	673	2.90%
8.1.3	615	2.65%
9.6.4	604	2.60%
9.6.2	589	2.54%
9.5.1	585	2.52%
9.5.6	564	2.43%
9.0.4	539	2.32%
9.6.3	367	1.58%
6.8.5	340	1.46%
7.2.3	340	1.46%
10.0.1	318	1.37%
9.0.1	294	1.27%
7.2.0	282	1.21%
9.5.5	269	1.16%
10.0.3	237	1.02%
Other	3,167	13.64%
IMail (16,160 servers)
Version	Number of Servers	Percent
8.22	3,183	19.70%
8.15	1,601	9.91%
11.0	1,370	8.48%
10.02	1,307	8.09%
9.23	1,254	7.76%
8.05	884	5.47%
9.10	642	3.97%
9.20	588	3.64%
7.07	573	3.55%
10.01	569	3.52%
9.21	485	3.00%
7.15	418	2.59%
8.00	360	2.23%
6.06	350	2.17%
8.04	319	1.97%
8.21	262	1.62%
10.0	224	1.39%
8.10	204	1.26%
8.01	194	1.20%
9.22	183	1.13%
Other	1,190	7.36%
Kerio (7,232 servers)
Version	Number of Servers	Percent
6.7.0	1,646	22.76%
6.6.2	1,234	17.06%
6.7.1	1,168	16.15%
6.5.2	453	6.26%
6.5.0	393	5.43%
6.4.1	306	4.23%
6.3.1	269	3.72%
6.6.0	250	3.46%
6.5.1	237	3.28%
6.6.1	198	2.74%
6.4.0	182	2.52%
6.4.2	156	2.16%
6.3.0	121	1.67%
Other	619	8.56%
Lotus Domino (5,806 servers)
Version	Number of Servers	Percent
8.5	752	12.95%
7.0.2	484	8.34%
8.0.2	380	6.54%
7.0.3	325	5.60%
8.0.1	320	5.51%
7.0.1	268	4.62%
6.5.4	236	4.06%
6.5.1	216	3.72%
6.5.3	201	3.46%
7.0.3FP1	199	3.43%
7.0.2FP2	191	3.29%
6.5.5	164	2.82%
8.0	163	2.81%
8.5FP1	163	2.81%
7.0	156	2.69%
6.5	150	2.58%
5.0.11	86	1.48%
8.0.2FP1	83	1.43%
7.0.2FP1	80	1.38%
7.0.2FP3	76	1.31%
6.5.2	75	1.29%
6.5.6	61	1.05%
Other	977	16.83%
WinWebMail (5,515 servers)
Version	Number of Servers	Percent
3.7.6.1	1,144	20.74%
3.7.3.1	915	16.59%
3.8.0.1	876	15.88%
3.7.7.3	822	14.90%
3.7.1.1	488	8.85%
3.7.5.1	289	5.24%
3.6.3.1	233	4.22%
3.7.7.1	212	3.84%
3.7.0.5	201	3.64%
3.7.0.3	149	2.70%
3.7.0.7	144	2.61%
Other	42	0.76%
CommuniGate Pro (4,161 servers)
Version	Number of Servers	Percent
4.1.8	291	6.99%
5.2.14	232	5.58%
5.2.12	200	4.81%
5.1.13	196	4.71%
5.2.16	193	4.64%
5.1.16	184	4.42%
5.2.13	173	4.16%
4.2.10	166	3.99%
5.2.8	154	3.70%
5.1.12	120	2.88%
5.2.15	117	2.81%
5.2.10	107	2.57%
5.2.3	101	2.43%
5.2.11	84	2.02%
5.0.14	83	1.99%
5.0.13	80	1.92%
5.0.9	75	1.80%
5.2.6	69	1.66%
5.1.14	67	1.61%
5.2.9	60	1.44%
5.1.9	59	1.42%
5.2.0	57	1.37%
5.2.5	53	1.27%
4.2.8	53	1.27%
4.2	51	1.23%
5.1.7	48	1.15%
4.2.9	46	1.11%
4.3.12	45	1.08%
5.2.7	45	1.08%
Other	952	22.88%
Merak (3,562 servers)
Version	Number of Servers	Percent
8.0.3	1,499	42.08%
8.9.1	338	9.49%
8.5.0	234	6.57%
7.4.5	204	5.73%
8.3.8	150	4.21%
7.6.4	148	4.15%
7.5.2	140	3.93%
7.4.2	68	1.91%
9.0.0	57	1.60%
7.2.0	47	1.32%
8.2.13	46	1.29%
7.6.1	43	1.21%
7.0.1	38	1.07%
6.2.1	38	1.07%
8.2.4	36	1.01%
Other	476	13.36%
XMail (2,701 servers)
Version	Number of Servers	Percent
1.25	781	28.92%
1.22	710	26.29%
1.24	433	16.03%
1.21	179	6.63%
1.26	153	5.66%
1.23	85	3.15%
1.20	85	3.15%
1.17	81	3.00%
1.12	63	2.33%
Other	131	4.85%
Qmail Toaster (1,839 servers)
Version	Number of Servers	Percent
1.3	1,607	87.38%
1.2	173	9.41%
1.0	40	2.18%
Other	19	1.03%
ArGoSoft (1,794 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	358	19.96%
1.8 (1.8.9.3)	260	14.49%
1.8 (1.8.9.6)	212	11.82%
1.8 (1.8.9.1)	178	9.92%
1.8 (1.8.8.8)	140	7.80%
1.8 (1.8.8.7)	116	6.47%
1.8 (1.8.9.2)	80	4.46%
1.8 (1.8.9.4)	51	2.84%
1.8 (1.8.8.9)	38	2.12%
1.8 (1.8.8.1)	36	2.01%
1.8 (1.8.6.0)	32	1.78%
1.8 (1.8.9.0)	28	1.56%
1.8 (1.8.8.2)	20	1.11%
Other	245	13.66%
GroupWise (1,752 servers)
Version	Number of Servers	Percent
7.0.3	560	31.96%
7.0.2	253	14.44%
6.5.7	210	11.99%
8.0.0	145	8.28%
7.0.1	118	6.74%
6.5.4	110	6.28%
6.5.6	75	4.28%
6.0.4	65	3.71%
6.5.1	45	2.57%
6.5.5	32	1.83%
8.0.1	27	1.54%
7.0	21	1.20%
Other	91	5.19%
SurgeSMTP (1,510 servers)
Version	Number of Servers	Percent
3.9e-1	340	22.52%
4.0u4-4	288	19.07%
3.9c-1	124	8.21%
3.8k4-4	115	7.62%
4.0u3-3	84	5.56%
3.7b8-8	46	3.05%
3.8i3-3	43	2.85%
3.8f3-3	41	2.72%
3.6f5-5	37	2.45%
3.9g2-2	34	2.25%
3.8f2-2	27	1.79%
3.9h-65	27	1.79%
3.5b3-3	24	1.59%
3.0c2-2	16	1.06%
Other	264	17.48%
Trend Micro (1,474 servers)
Version	Number of Servers	Percent
5.7	712	48.30%
5.5	433	29.38%
5.18	213	14.45%
7.0	93	6.31%
Other	23	1.56%
Gordano Messaging Suite (GMS) (739 servers)
Version	Number of Servers	Percent
Other	739	100.00%
Post.Office (651 servers)
Version	Number of Servers	Percent
3.5.3	129	19.82%
4.1.0.2	71	10.91%
4.0.1	57	8.76%
3.5.3J	49	7.53%
3.8.3	29	4.45%
4.1.0.4	20	3.07%
3.6.3	20	3.07%
3.9.2.3	19	2.92%
3.6.2	19	2.92%
3.1.2J	19	2.92%
3.9.1	18	2.76%
3.1.2	15	2.30%
3.9.2	15	2.30%
3.9.0	13	2.00%
3.8.7.4	13	2.00%
4.1	12	1.84%
4.0.0.2	11	1.69%
4.0.0.1	10	1.54%
3.8.4	10	1.54%
4.1.0.3	9	1.38%
3.9.1.3	8	1.23%
3.9.2.1	8	1.23%
4.0.1.1	7	1.08%
3.5.2	7	1.08%
Other	63	9.68%
Mirapoint (458 servers)
Version	Number of Servers	Percent
3.8.4-GA	59	12.88%
3.8.3-GA	56	12.23%
3.10.5-GA	45	9.83%
3.10.4-GA	31	6.77%
3.10.3-GA	27	5.90%
3.8.7a	23	5.02%
4.1.3-GA	21	4.59%
3.10.6-GA	21	4.59%
3.8.6-GA	20	4.37%
3.7.5a-GA	18	3.93%
3.10.7-GA	17	3.71%
3.8.2-GA	16	3.49%
4.1.4-GA	13	2.84%
3.8.5-GA	12	2.62%
4.1.5-GA	12	2.62%
3.10.2-GA	10	2.18%
4.0.5a	9	1.97%
3.7.3a-GA	9	1.97%
4.1.6-GA	9	1.97%
3.7.4b-GA	6	1.31%
Other	24	5.24%
VisNetic (403 servers)
Version	Number of Servers	Percent
9.3.2.0	151	37.47%
9.1.4.1	54	13.40%
5.8.6.6	20	4.96%
8.5.0.8	14	3.47%
5.0.2.3	13	3.23%
6.2.2.0	11	2.73%
5.5.8.3	11	2.73%
9.1.4.0	11	2.73%
8.0.3.0	11	2.73%
8.3.6	10	2.48%
7.2.4.1	10	2.48%
5.3.5.0	9	2.23%
8.0.3.1	8	1.99%
5.4.5.4	8	1.99%
7.6.1.0	8	1.99%
8.3.5.0	7	1.74%
8.0.3	6	1.49%
5.8.6.4	5	1.24%
Other	36	8.93%
MagicMail (399 servers)
Version	Number of Servers	Percent
Other	399	100.00%
InterScan VirusWall (396 servers)
Version	Number of Servers	Percent
Other	396	100.00%
NetIQ MailMarshal (246 servers)
Version	Number of Servers	Percent
6.0.3.8	189	76.83%
6.1.3.15	17	6.91%
5.5.6.7	16	6.50%
5.5.4.16	5	2.03%
5.5.6.5	4	1.63%
5.5.6.6	3	1.22%
Other	12	4.88%
Interscan (236 servers)
Version	Number of Servers	Percent
3.8-Build_3013	49	20.76%
3.55 (build 1016)	42	17.80%
3.81-Build_1022	30	12.71%
3.55 (build 1029)	20	8.47%
3.53 (build 2017)	19	8.05%
3.81-Build_1084	12	5.08%
3.53 (build 2011)	12	5.08%
3.53 (build 1493)	10	4.24%
3.53 (build 2013)	7	2.97%
3.55 (build 1020)	7	2.97%
3.52 (build 1375)	5	2.12%
3.51 (build 1337)	3	1.27%
Other	20	8.47%
Neon Mail Server (125 servers)
Version	Number of Servers	Percent
3.1.3	31	24.80%
3.0.7	22	17.60%
3.0.9	17	13.60%
3.1.4	16	12.80%
3.1.5	11	8.80%
3.1.2	10	8.00%
3.1.0	9	7.20%
3.1.1	3	2.40%
3.0.8	3	2.40%
3.0.6	2	1.60%
Other	1	0.80%
WebSTAR V (124 servers)
Version	Number of Servers	Percent
5.4.1	43	34.68%
5.4.0	30	24.19%
5.3.4	29	23.39%
5.3.2	11	8.87%
5.3.3	8	6.45%
5.3.1	2	1.61%
Other	1	0.81%
Mercury (114 servers)
Version	Number of Servers	Percent
1.48	54	47.37%
3.32	36	31.58%
3.21c	9	7.89%
1.47	4	3.51%
1.44	2	1.75%
3.21	2	1.75%
3.01a	2	1.75%
1.49	2	1.75%
Other	3	2.63%
ModusMail (53 servers)
Version	Number of Servers	Percent
4.35.477.0	10	18.87%
4.35.480.0	9	16.98%
3.2.315.0	8	15.09%
3.1.302.0	6	11.32%
4.2.420.0	5	9.43%
4.35.480.11	4	7.55%
4.1.361.21	3	5.66%
3.1.293.1	2	3.77%
4.2.425.22	1	1.89%
4.1.361.0	1	1.89%
4.2.425.4	1	1.89%
4.0.340.3	1	1.89%
4.3.459.0	1	1.89%
4.35.477.8	1	1.89%
Other	0	0.00%
MessageWall (52 servers)
Version	Number of Servers	Percent
1.0.8	34	65.38%
1.0.11	15	28.85%
1.1.0	2	3.85%
1.0.6	1	1.92%
Other	0	0.00%
WebSTAR (44 servers)
Version	Number of Servers	Percent
Other	44	100.00%
MAILsweeper (37 servers)
Version	Number of Servers	Percent
4.3.20.0	11	29.73%
4.3.14.0	6	16.22%
4.3.17.0	5	13.51%
4.3.1.0	4	10.81%
4.2.10.0	3	8.11%
4.3.19.0	2	5.41%
4.3.10.0	2	5.41%
4.3.6.0	2	5.41%
4.3.12.0	1	2.70%
4.2.5.0	1	2.70%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	16	61.54%
7.3	5	19.23%
8.2	2	7.69%
7.2	2	7.69%
6.1	1	3.85%
Other	0	0.00%