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	1,925,462	100.0%
Number of Servers that didn't respond	304,927	15.84%
Server didn't open socket	292,844	15.21%
Server didn't provide banner	12,083	0.63%
Server provided banner	1,620,535	84.16%
Server banner identifies software in use	923,003	47.94%

As indicated by the above table, of the 1,925,462 servers queried, only 923,003 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	248,296	26.90%
Sendmail	201,901	21.87%
Microsoft	195,670	21.20%
Postfix	167,042	18.10%
MailEnable	26,965	2.92%
MDaemon	22,696	2.46%
IMail	17,435	1.89%
Kerio	6,521	0.71%
Lotus Domino	5,945	0.64%
WinWebMail	5,085	0.55%
CommuniGate Pro	4,409	0.48%
Merak	4,287	0.46%
XMail	2,634	0.29%
GroupWise	2,140	0.23%
ArGoSoft	2,034	0.22%
Trend Micro	1,883	0.20%
Qmail Toaster	1,787	0.19%
SurgeSMTP	1,570	0.17%
Gordano Messaging Suite (GMS)	790	0.09%
Post.Office	715	0.08%
Mirapoint	524	0.06%
InterScan VirusWall	469	0.05%
VisNetic	454	0.05%
MagicMail	410	0.04%
NetIQ MailMarshal	341	0.04%
Interscan	285	0.03%
Neon Mail Server	170	0.02%
WebSTAR V	139	0.02%
Mercury	135	0.01%
ModusMail	74	0.01%
MessageWall	65	0.01%
WebSTAR	58	0.01%
MAILsweeper	49	0.01%
OpenVMS	25	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (248,296 servers)
Version	Number of Servers	Percent
4.69	191,070	76.95%
4.63	19,284	7.77%
4.67	11,186	4.51%
4.68	6,148	2.48%
4.66	4,455	1.79%
4.60	4,090	1.65%
4.50	3,323	1.34%
4.62	2,850	1.15%
Other	5,890	2.37%
Sendmail (201,901 servers)
Version	Number of Servers	Percent
8.13.1	35,239	17.45%
8.13.8	20,660	10.23%
8.12.11.20060614	20,483	10.15%
8.13.6	18,366	9.10%
8.12.11.20060308	17,655	8.74%
8.14.3	10,963	5.43%
8.13.6.20060614	10,942	5.42%
8.11.6	9,885	4.90%
8.12.10	9,410	4.66%
8.12.11	9,171	4.54%
8.14.1	7,222	3.58%
8.14.2	6,657	3.30%
8.13.4	5,045	2.50%
8.13.7	4,405	2.18%
8.12.8	3,923	1.94%
8.9.3	2,268	1.12%
Other	9,607	4.76%
Microsoft (195,670 servers)
Version	Number of Servers	Percent
6.0.3790.3959	155,268	79.35%
6.0.3790.1830	23,719	12.12%
5.0.2195.6713	11,070	5.66%
6.0.3790.211	2,725	1.39%
Other	2,888	1.48%
Postfix (167,042 servers)
Version	Number of Servers	Percent
Other	167,042	100.00%
MailEnable (26,965 servers)
Version	Number of Servers	Percent
1.986--	5,458	20.24%
1.981--	4,979	18.46%
1.983--	3,160	11.72%
1.96--	1,110	4.12%
1.95--	1,037	3.85%
0-3.6-	1,030	3.82%
1.9--	842	3.12%
1.8--	639	2.37%
0-2.37-	571	2.12%
0-3.14-	570	2.11%
--3.6	506	1.88%
0-1.85-	427	1.58%
0-3.53-	405	1.50%
0-1.87-	343	1.27%
0-2.52-	290	1.08%
Other	5,598	20.76%
MDaemon (22,696 servers)
Version	Number of Servers	Percent
10.0.4	4,336	19.10%
9.6.6	1,445	6.37%
9.6.1	1,326	5.84%
9.6.5	1,193	5.26%
10.0.2	1,143	5.04%
10.0.0	1,097	4.83%
9.5.2	802	3.53%
9.6.4	771	3.40%
8.1.3	726	3.20%
9.6.2	725	3.19%
10.0.3	720	3.17%
9.5.6	685	3.02%
10.0.1	654	2.88%
9.0.4	622	2.74%
9.5.1	584	2.57%
9.6.3	442	1.95%
7.2.3	394	1.74%
6.8.5	385	1.70%
9.0.1	319	1.41%
7.2.0	318	1.40%
9.5.5	259	1.14%
9.0.0	258	1.14%
8.1.4	233	1.03%
Other	3,259	14.36%
IMail (17,435 servers)
Version	Number of Servers	Percent
8.22	3,488	20.01%
8.15	1,921	11.02%
10.02	1,879	10.78%
9.23	1,383	7.93%
9.10	1,048	6.01%
8.05	980	5.62%
10.01	825	4.73%
7.07	646	3.71%
9.21	569	3.26%
7.15	508	2.91%
6.06	425	2.44%
8.00	405	2.32%
10.0	323	1.85%
8.04	319	1.83%
9.20	308	1.77%
9.22	294	1.69%
8.21	286	1.64%
8.01	212	1.22%
8.10	209	1.20%
Other	1,407	8.07%
Kerio (6,521 servers)
Version	Number of Servers	Percent
6.6.2	1,834	28.12%
6.5.2	753	11.55%
6.5.0	546	8.37%
6.6.0	519	7.96%
6.6.1	436	6.69%
6.4.1	382	5.86%
6.3.1	353	5.41%
6.5.1	344	5.28%
6.4.0	243	3.73%
6.4.2	223	3.42%
6.3.0	148	2.27%
6.1.3	66	1.01%
6.2.0	66	1.01%
Other	608	9.32%
Lotus Domino (5,945 servers)
Version	Number of Servers	Percent
7.0.2	559	9.40%
8.0.2	461	7.75%
8.0.1	435	7.32%
7.0.3	366	6.16%
8.5	334	5.62%
7.0.1	306	5.15%
6.5.4	293	4.93%
6.5.1	257	4.32%
7.0.2FP2	239	4.02%
6.5.3	236	3.97%
7.0.3FP1	211	3.55%
6.5.5	192	3.23%
7.0	184	3.10%
8.0	184	3.10%
6.5	166	2.79%
7.0.2FP1	106	1.78%
6.5.2	103	1.73%
5.0.11	99	1.67%
7.0.2FP3	78	1.31%
6.5.6	69	1.16%
5.0.12	64	1.08%
Other	1,003	16.87%
WinWebMail (5,085 servers)
Version	Number of Servers	Percent
3.7.6.1	1,219	23.97%
3.7.3.1	1,005	19.76%
3.7.7.3	853	16.77%
3.7.1.1	555	10.91%
3.7.5.1	336	6.61%
3.6.3.1	298	5.86%
3.7.0.5	237	4.66%
3.7.7.1	221	4.35%
3.7.0.3	163	3.21%
3.7.0.7	152	2.99%
Other	46	0.90%
CommuniGate Pro (4,409 servers)
Version	Number of Servers	Percent
5.2.12	361	8.19%
4.1.8	332	7.53%
5.1.13	225	5.10%
4.2.10	209	4.74%
5.2.8	185	4.20%
5.1.16	177	4.01%
5.2.10	164	3.72%
5.1.12	148	3.36%
5.2.11	143	3.24%
5.2.3	120	2.72%
5.1.14	115	2.61%
5.2.9	99	2.25%
5.2.6	98	2.22%
5.0.13	94	2.13%
5.0.9	93	2.11%
5.0.14	88	2.00%
5.2.0	85	1.93%
5.2.5	84	1.91%
5.1.9	75	1.70%
5.2.1	63	1.43%
5.1.10	58	1.32%
5.1.7	57	1.29%
4.2	56	1.27%
5.1.11	54	1.22%
5.2.7	53	1.20%
5.1.8	51	1.16%
4.2.8	51	1.16%
4.2.9	50	1.13%
Other	1,021	23.16%
Merak (4,287 servers)
Version	Number of Servers	Percent
8.0.3	1,758	41.01%
8.9.1	403	9.40%
8.5.0	266	6.20%
7.4.5	222	5.18%
7.6.4	199	4.64%
8.3.8	191	4.46%
7.5.2	191	4.46%
7.4.2	90	2.10%
9.0.0	84	1.96%
7.2.0	64	1.49%
7.6.1	57	1.33%
8.2.13	53	1.24%
6.2.1	52	1.21%
8.2.4	52	1.21%
Other	605	14.11%
XMail (2,634 servers)
Version	Number of Servers	Percent
1.25	740	28.09%
1.22	713	27.07%
1.24	482	18.30%
1.21	209	7.93%
1.17	101	3.83%
1.20	98	3.72%
1.23	91	3.45%
1.12	67	2.54%
1.16	31	1.18%
Other	102	3.87%
GroupWise (2,140 servers)
Version	Number of Servers	Percent
7.0.3	699	32.66%
7.0.2	372	17.38%
6.5.7	246	11.50%
7.0.1	164	7.66%
6.5.4	131	6.12%
6.5.6	92	4.30%
6.0.4	81	3.79%
8.0.0	77	3.60%
6.5.1	63	2.94%
7.0	47	2.20%
6.5.5	47	2.20%
Other	121	5.65%
ArGoSoft (2,034 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	432	21.24%
1.8 (1.8.9.3)	303	14.90%
1.8 (1.8.9.1)	229	11.26%
1.8 (1.8.8.8)	157	7.72%
1.8 (1.8.8.7)	152	7.47%
1.8 (1.8.9.6)	120	5.90%
1.8 (1.8.9.2)	98	4.82%
1.8 (1.8.9.4)	59	2.90%
1.8 (1.8.8.9)	51	2.51%
1.8 (1.8.8.1)	39	1.92%
1.8 (1.8.9.0)	34	1.67%
1.8 (1.8.6.0)	31	1.52%
1.8 (1.8.8.2)	27	1.33%
Other	302	14.85%
Trend Micro (1,883 servers)
Version	Number of Servers	Percent
5.7	878	46.63%
5.5	600	31.86%
5.18	275	14.60%
7.0	96	5.10%
Other	34	1.81%
Qmail Toaster (1,787 servers)
Version	Number of Servers	Percent
1.3	1,517	84.89%
1.2	199	11.14%
1.0	46	2.57%
1.5	19	1.06%
Other	6	0.34%
SurgeSMTP (1,570 servers)
Version	Number of Servers	Percent
3.9e-1	549	34.97%
3.9c-1	152	9.68%
3.8k4-4	144	9.17%
3.9g2-2	131	8.34%
3.8f3-3	61	3.89%
3.7b8-8	61	3.89%
3.8i3-3	46	2.93%
3.6f5-5	42	2.68%
3.5b3-3	40	2.55%
4.0a-1	39	2.48%
3.8f2-2	31	1.97%
3.9h-65	25	1.59%
3.0c2-2	21	1.34%
3.8k2-2	16	1.02%
Other	212	13.50%
Gordano Messaging Suite (GMS) (790 servers)
Version	Number of Servers	Percent
Other	790	100.00%
Post.Office (715 servers)
Version	Number of Servers	Percent
3.5.3	166	23.22%
4.0.1	70	9.79%
4.1.0.2	64	8.95%
3.5.3J	44	6.15%
3.8.3	37	5.17%
3.6.3	28	3.92%
3.9.2.3	24	3.36%
3.9.1	23	3.22%
3.6.2	22	3.08%
3.1.2J	22	3.08%
3.9.2	20	2.80%
3.1.2	18	2.52%
3.5.2	13	1.82%
3.9.0	13	1.82%
3.8.7.4	12	1.68%
4.1	11	1.54%
3.9.2.1	11	1.54%
4.0.0.2	11	1.54%
3.8.4	11	1.54%
3.9.1.3	9	1.26%
4.0.0.1	9	1.26%
4.0.1.1	8	1.12%
3.8.5	8	1.12%
Other	61	8.53%
Mirapoint (524 servers)
Version	Number of Servers	Percent
3.8.4-GA	89	16.98%
3.8.3-GA	68	12.98%
3.10.4-GA	42	8.02%
3.8.6-GA	42	8.02%
3.8.7a	39	7.44%
3.10.3-GA	33	6.30%
3.7.5a-GA	27	5.15%
3.8.5-GA	22	4.20%
4.1.3-GA	21	4.01%
3.8.2-GA	21	4.01%
3.7.3a-GA	21	4.01%
3.7.4b-GA	16	3.05%
4.0.5a	15	2.86%
3.10.2-GA	15	2.86%
4.1.4-GA	13	2.48%
Other	40	7.63%
InterScan VirusWall (469 servers)
Version	Number of Servers	Percent
Other	469	100.00%
VisNetic (454 servers)
Version	Number of Servers	Percent
9.3.2.0	118	25.99%
9.1.4.1	71	15.64%
5.8.6.6	22	4.85%
7.2.4.1	22	4.85%
8.5.0.8	21	4.63%
5.0.2.3	16	3.52%
5.5.8.3	15	3.30%
6.2.2.0	15	3.30%
9.1.4.0	14	3.08%
8.0.3.1	14	3.08%
8.0.3.0	14	3.08%
5.3.5.0	12	2.64%
8.0.3	11	2.42%
8.3.5.0	10	2.20%
8.3.6	9	1.98%
5.4.5.4	9	1.98%
7.6.1.0	9	1.98%
5.8.6.4	6	1.32%
7.5.3.0	5	1.10%
6.0.9.0	5	1.10%
Other	36	7.93%
MagicMail (410 servers)
Version	Number of Servers	Percent
Other	410	100.00%
NetIQ MailMarshal (341 servers)
Version	Number of Servers	Percent
6.0.3.8	269	78.89%
6.1.3.15	20	5.87%
5.5.6.7	17	4.99%
5.5.4.16	7	2.05%
5.5.6.6	5	1.47%
5.5.5.9	5	1.47%
5.5.6.5	5	1.47%
5.5.5.6	4	1.17%
Other	9	2.64%
Interscan (285 servers)
Version	Number of Servers	Percent
3.8-Build_3013	54	18.95%
3.55 (build 1016)	52	18.25%
3.81-Build_1022	38	13.33%
3.55 (build 1029)	27	9.47%
3.53 (build 2017)	18	6.32%
3.53 (build 2011)	14	4.91%
3.81-Build_1084	12	4.21%
3.53 (build 1493)	12	4.21%
3.55 (build 1020)	11	3.86%
3.53 (build 2013)	10	3.51%
3.52 (build 1375)	7	2.46%
3.8-Build_3065	3	1.05%
3.51 (build 1337)	3	1.05%
3.8-Build_1080	3	1.05%
Other	21	7.37%
Neon Mail Server (170 servers)
Version	Number of Servers	Percent
3.1.3	44	25.88%
3.1.4	29	17.06%
3.0.7	29	17.06%
3.0.9	24	14.12%
3.1.2	17	10.00%
3.1.0	15	8.82%
3.1.5	5	2.94%
3.0.8	3	1.76%
3.1.1	2	1.18%
Other	2	1.18%
WebSTAR V (139 servers)
Version	Number of Servers	Percent
5.4.1	45	32.37%
5.4.0	38	27.34%
5.3.4	31	22.30%
5.3.2	12	8.63%
5.3.3	10	7.19%
Other	3	2.16%
Mercury (135 servers)
Version	Number of Servers	Percent
1.48	62	45.93%
3.32	43	31.85%
3.21c	10	7.41%
1.47	5	3.70%
3.31	5	3.70%
1.44	2	1.48%
3.21	2	1.48%
3.01a	2	1.48%
1.49	2	1.48%
Other	2	1.48%
ModusMail (74 servers)
Version	Number of Servers	Percent
3.2.315.0	15	20.27%
4.35.480.0	11	14.86%
4.35.477.0	9	12.16%
4.35.480.11	8	10.81%
3.1.302.0	7	9.46%
4.2.420.0	6	8.11%
4.3.459.0	5	6.76%
4.1.361.21	3	4.05%
4.2.425.4	2	2.70%
3.1.293.1	2	2.70%
4.2.425.22	1	1.35%
4.1.361.0	1	1.35%
4.0.340.3	1	1.35%
4.0.330.8	1	1.35%
1.4.232.0	1	1.35%
4.35.477.8	1	1.35%
Other	0	0.00%
MessageWall (65 servers)
Version	Number of Servers	Percent
1.0.8	47	72.31%
1.0.11	15	23.08%
1.1.0	2	3.08%
1.0.6	1	1.54%
Other	0	0.00%
WebSTAR (58 servers)
Version	Number of Servers	Percent
Other	58	100.00%
MAILsweeper (49 servers)
Version	Number of Servers	Percent
4.3.20.0	15	30.61%
4.3.14.0	7	14.29%
4.3.17.0	6	12.24%
4.2.10.0	5	10.20%
4.3.1.0	5	10.20%
4.3.19.0	3	6.12%
4.3.6.0	3	6.12%
4.3.10.0	2	4.08%
4.2.1.0	1	2.04%
4.2.5.0	1	2.04%
4.1.5.0	1	2.04%
Other	0	0.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	15	60.00%
7.3	4	16.00%
8.2	3	12.00%
7.2	2	8.00%
6.1	1	4.00%
Other	0	0.00%