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	1,933,004	100.0%
Number of Servers that didn't respond	312,833	16.18%
Server didn't open socket	300,525	15.55%
Server didn't provide banner	12,308	0.64%
Server provided banner	1,620,171	83.82%
Server banner identifies software in use	921,180	47.66%

As indicated by the above table, of the 1,933,004 servers queried, only 921,180 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	251,641	27.32%
Sendmail	197,439	21.43%
Microsoft	194,106	21.07%
Postfix	168,252	18.26%
MailEnable	27,075	2.94%
MDaemon	22,781	2.47%
IMail	17,255	1.87%
Kerio	6,672	0.72%
Lotus Domino	5,857	0.64%
WinWebMail	5,221	0.57%
CommuniGate Pro	4,327	0.47%
Merak	4,160	0.45%
XMail	2,626	0.29%
GroupWise	2,083	0.23%
ArGoSoft	1,996	0.22%
Qmail Toaster	1,780	0.19%
Trend Micro	1,773	0.19%
SurgeSMTP	1,569	0.17%
Gordano Messaging Suite (GMS)	795	0.09%
Post.Office	683	0.07%
Mirapoint	506	0.05%
InterScan VirusWall	453	0.05%
VisNetic	438	0.05%
MagicMail	409	0.04%
NetIQ MailMarshal	326	0.04%
Interscan	266	0.03%
Neon Mail Server	173	0.02%
WebSTAR V	135	0.01%
Mercury	126	0.01%
ModusMail	73	0.01%
MessageWall	58	0.01%
WebSTAR	52	0.01%
MAILsweeper	49	0.01%
OpenVMS	25	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (251,641 servers)
Version	Number of Servers	Percent
4.69	196,234	77.98%
4.63	18,060	7.18%
4.67	11,921	4.74%
4.68	5,516	2.19%
4.66	4,462	1.77%
4.60	3,865	1.54%
4.50	3,078	1.22%
4.62	2,834	1.13%
Other	5,671	2.25%
Sendmail (197,439 servers)
Version	Number of Servers	Percent
8.13.1	34,911	17.68%
8.13.8	20,573	10.42%
8.12.11.20060614	19,564	9.91%
8.12.11.20060308	17,213	8.72%
8.13.6	17,079	8.65%
8.14.3	12,481	6.32%
8.13.6.20060614	10,781	5.46%
8.12.10	9,020	4.57%
8.12.11	8,924	4.52%
8.11.6	8,774	4.44%
8.14.1	7,160	3.63%
8.14.2	6,639	3.36%
8.13.4	4,884	2.47%
8.13.7	4,331	2.19%
8.12.8	3,730	1.89%
8.9.3	2,162	1.10%
Other	9,213	4.67%
Microsoft (194,106 servers)
Version	Number of Servers	Percent
6.0.3790.3959	156,097	80.42%
6.0.3790.1830	22,130	11.40%
5.0.2195.6713	10,586	5.45%
6.0.3790.211	2,532	1.30%
Other	2,761	1.42%
Postfix (168,252 servers)
Version	Number of Servers	Percent
Other	168,252	100.00%
MailEnable (27,075 servers)
Version	Number of Servers	Percent
1.986--	5,780	21.35%
1.981--	4,799	17.72%
1.983--	3,037	11.22%
1.96--	1,045	3.86%
1.95--	995	3.67%
0-3.6-	854	3.15%
1.9--	798	2.95%
1.8--	609	2.25%
3.62--	569	2.10%
0-3.61-	550	2.03%
0-3.14-	528	1.95%
0-2.37-	508	1.88%
--3.6	400	1.48%
--3.61	394	1.46%
0-1.85-	390	1.44%
0-1.87-	358	1.32%
0-3.53-	356	1.31%
0-2.53-	326	1.20%
Other	4,779	17.65%
MDaemon (22,781 servers)
Version	Number of Servers	Percent
10.0.4	5,175	22.72%
9.6.6	1,342	5.89%
9.6.1	1,290	5.66%
10.0.0	1,176	5.16%
9.6.5	1,080	4.74%
10.0.2	941	4.13%
9.5.2	785	3.45%
9.6.4	725	3.18%
8.1.3	703	3.09%
9.6.2	694	3.05%
9.5.6	669	2.94%
9.0.4	594	2.61%
9.5.1	593	2.60%
10.0.1	567	2.49%
10.0.3	521	2.29%
9.6.3	430	1.89%
7.2.3	377	1.65%
6.8.5	373	1.64%
7.2.0	324	1.42%
9.0.1	318	1.40%
9.5.5	267	1.17%
9.0.0	254	1.11%
Other	3,583	15.73%
IMail (17,255 servers)
Version	Number of Servers	Percent
8.22	3,398	19.69%
10.02	2,192	12.70%
8.15	1,826	10.58%
9.23	1,339	7.76%
8.05	941	5.45%
9.10	734	4.25%
10.01	642	3.72%
7.07	627	3.63%
9.20	611	3.54%
9.21	522	3.03%
7.15	481	2.79%
6.06	413	2.39%
8.00	402	2.33%
9.22	396	2.29%
8.04	323	1.87%
10.0	313	1.81%
8.21	300	1.74%
8.10	212	1.23%
8.01	208	1.21%
8.20	176	1.02%
Other	1,199	6.95%
Kerio (6,672 servers)
Version	Number of Servers	Percent
6.6.2	2,254	33.78%
6.5.2	683	10.24%
6.5.0	512	7.67%
6.6.0	469	7.03%
6.6.1	390	5.85%
6.4.1	373	5.59%
6.3.1	328	4.92%
6.5.1	327	4.90%
6.4.0	245	3.67%
6.4.2	212	3.18%
6.3.0	144	2.16%
Other	735	11.02%
Lotus Domino (5,857 servers)
Version	Number of Servers	Percent
7.0.2	538	9.19%
8.5	465	7.94%
8.0.2	436	7.44%
8.0.1	401	6.85%
7.0.3	359	6.13%
6.5.4	297	5.07%
7.0.1	283	4.83%
6.5.1	230	3.93%
7.0.2FP2	222	3.79%
6.5.3	217	3.70%
7.0.3FP1	217	3.70%
6.5.5	185	3.16%
8.0	177	3.02%
7.0	175	2.99%
6.5	168	2.87%
6.5.2	98	1.67%
5.0.11	97	1.66%
7.0.2FP1	96	1.64%
8.0.2FP1	73	1.25%
7.0.2FP3	72	1.23%
6.5.6	68	1.16%
5.0.12	61	1.04%
Other	922	15.74%
WinWebMail (5,221 servers)
Version	Number of Servers	Percent
3.7.6.1	1,230	23.56%
3.7.3.1	1,002	19.19%
3.7.7.3	903	17.30%
3.7.1.1	545	10.44%
3.7.5.1	340	6.51%
3.6.3.1	274	5.25%
3.7.7.1	234	4.48%
3.7.0.5	224	4.29%
3.7.0.3	161	3.08%
3.7.0.7	157	3.01%
3.8.0.1	103	1.97%
Other	48	0.92%
CommuniGate Pro (4,327 servers)
Version	Number of Servers	Percent
4.1.8	325	7.51%
5.2.12	268	6.19%
5.2.13	238	5.50%
5.1.13	208	4.81%
4.2.10	202	4.67%
5.1.16	173	4.00%
5.2.8	170	3.93%
5.1.12	139	3.21%
5.2.10	138	3.19%
5.2.11	129	2.98%
5.2.3	117	2.70%
5.1.14	103	2.38%
5.0.13	94	2.17%
5.2.6	91	2.10%
5.0.9	91	2.10%
5.0.14	88	2.03%
5.2.9	87	2.01%
5.2.5	79	1.83%
5.2.0	77	1.78%
5.1.9	69	1.59%
5.2.1	55	1.27%
5.1.10	52	1.20%
5.1.7	52	1.20%
4.2.8	51	1.18%
4.2	50	1.16%
5.1.8	50	1.16%
5.1.11	48	1.11%
5.2.7	48	1.11%
4.2.9	47	1.09%
Other	988	22.83%
Merak (4,160 servers)
Version	Number of Servers	Percent
8.0.3	1,715	41.23%
8.9.1	395	9.50%
8.5.0	248	5.96%
7.4.5	225	5.41%
7.6.4	192	4.62%
7.5.2	184	4.42%
8.3.8	176	4.23%
7.4.2	87	2.09%
9.0.0	81	1.95%
7.2.0	61	1.47%
6.2.1	52	1.25%
7.6.1	51	1.23%
8.2.4	50	1.20%
8.2.13	48	1.15%
Other	595	14.30%
XMail (2,626 servers)
Version	Number of Servers	Percent
1.25	753	28.67%
1.22	716	27.27%
1.24	474	18.05%
1.21	199	7.58%
1.17	96	3.66%
1.20	94	3.58%
1.23	84	3.20%
1.12	69	2.63%
1.16	32	1.22%
Other	109	4.15%
GroupWise (2,083 servers)
Version	Number of Servers	Percent
7.0.3	685	32.89%
7.0.2	334	16.03%
6.5.7	250	12.00%
7.0.1	159	7.63%
6.5.4	139	6.67%
8.0.0	89	4.27%
6.5.6	87	4.18%
6.0.4	75	3.60%
6.5.1	60	2.88%
6.5.5	46	2.21%
7.0	44	2.11%
Other	115	5.52%
ArGoSoft (1,996 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	408	20.44%
1.8 (1.8.9.3)	299	14.98%
1.8 (1.8.9.1)	220	11.02%
1.8 (1.8.8.8)	154	7.72%
1.8 (1.8.8.7)	148	7.41%
1.8 (1.8.9.6)	134	6.71%
1.8 (1.8.9.2)	97	4.86%
1.8 (1.8.9.4)	58	2.91%
1.8 (1.8.8.9)	51	2.56%
1.8 (1.8.8.1)	40	2.00%
1.8 (1.8.9.0)	37	1.85%
1.8 (1.8.6.0)	28	1.40%
1.8 (1.8.8.2)	26	1.30%
Other	296	14.83%
Qmail Toaster (1,780 servers)
Version	Number of Servers	Percent
1.3	1,522	85.51%
1.2	191	10.73%
1.0	46	2.58%
Other	21	1.18%
Trend Micro (1,773 servers)
Version	Number of Servers	Percent
5.7	849	47.88%
5.5	547	30.85%
5.18	251	14.16%
7.0	95	5.36%
Other	31	1.75%
SurgeSMTP (1,569 servers)
Version	Number of Servers	Percent
3.9e-1	539	34.35%
3.9c-1	150	9.56%
3.8k4-4	142	9.05%
3.9g2-2	125	7.97%
3.7b8-8	59	3.76%
3.8f3-3	58	3.70%
3.8i3-3	48	3.06%
3.6f5-5	42	2.68%
3.5b3-3	38	2.42%
3.8f2-2	28	1.78%
3.9h-65	26	1.66%
3.0c2-2	23	1.47%
4.0a-1	21	1.34%
3.8k2-2	18	1.15%
Other	252	16.06%
Gordano Messaging Suite (GMS) (795 servers)
Version	Number of Servers	Percent
Other	795	100.00%
Post.Office (683 servers)
Version	Number of Servers	Percent
3.5.3	157	22.99%
4.1.0.2	70	10.25%
4.0.1	66	9.66%
3.5.3J	44	6.44%
3.8.3	36	5.27%
3.6.3	23	3.37%
3.9.1	22	3.22%
3.6.2	22	3.22%
3.9.2.3	21	3.07%
3.1.2J	21	3.07%
3.1.2	17	2.49%
3.9.2	14	2.05%
3.8.7.4	14	2.05%
3.9.0	13	1.90%
3.5.2	11	1.61%
3.8.4	11	1.61%
4.1	10	1.46%
3.9.1.3	9	1.32%
3.9.2.1	9	1.32%
3.8.5	8	1.17%
4.0.0.2	8	1.17%
3.9.1.2	7	1.02%
3.6.0	7	1.02%
4.0.0.1	7	1.02%
4.0.1.1	7	1.02%
Other	49	7.17%
Mirapoint (506 servers)
Version	Number of Servers	Percent
3.8.4-GA	87	17.19%
3.8.3-GA	72	14.23%
3.8.7a	43	8.50%
3.10.4-GA	42	8.30%
3.8.6-GA	36	7.11%
3.10.3-GA	27	5.34%
4.1.3-GA	23	4.55%
3.7.5a-GA	23	4.55%
3.8.2-GA	22	4.35%
3.8.5-GA	21	4.15%
3.7.3a-GA	16	3.16%
4.0.5a	14	2.77%
3.10.2-GA	13	2.57%
3.7.4b-GA	13	2.57%
4.1.4-GA	7	1.38%
4.1.5-GA	7	1.38%
3.10.5-GA	6	1.19%
Other	34	6.72%
InterScan VirusWall (453 servers)
Version	Number of Servers	Percent
Other	453	100.00%
VisNetic (438 servers)
Version	Number of Servers	Percent
9.3.2.0	131	29.91%
9.1.4.1	64	14.61%
5.8.6.6	21	4.79%
8.5.0.8	20	4.57%
5.0.2.3	16	3.65%
5.5.8.3	15	3.42%
6.2.2.0	15	3.42%
9.1.4.0	14	3.20%
8.0.3.1	14	3.20%
7.2.4.1	13	2.97%
8.0.3.0	12	2.74%
8.3.5.0	10	2.28%
8.0.3	10	2.28%
5.3.5.0	9	2.05%
7.6.1.0	8	1.83%
5.4.5.4	7	1.60%
8.3.6	7	1.60%
5.8.6.4	6	1.37%
6.0.9.0	5	1.14%
Other	41	9.36%
MagicMail (409 servers)
Version	Number of Servers	Percent
Other	409	100.00%
NetIQ MailMarshal (326 servers)
Version	Number of Servers	Percent
6.0.3.8	258	79.14%
5.5.6.7	18	5.52%
6.1.3.15	18	5.52%
5.5.4.16	6	1.84%
5.5.6.6	5	1.53%
5.5.6.5	5	1.53%
5.5.4.17	4	1.23%
Other	12	3.68%
Interscan (266 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	53	19.92%
3.8-Build_3013	49	18.42%
3.81-Build_1022	34	12.78%
3.53 (build 2017)	22	8.27%
3.55 (build 1029)	22	8.27%
3.53 (build 2011)	13	4.89%
3.81-Build_1084	12	4.51%
3.55 (build 1020)	10	3.76%
3.53 (build 1493)	10	3.76%
3.53 (build 2013)	9	3.38%
3.52 (build 1375)	7	2.63%
3.8-Build_3065	3	1.13%
Other	22	8.27%
Neon Mail Server (173 servers)
Version	Number of Servers	Percent
3.1.3	44	25.43%
3.1.4	31	17.92%
3.0.7	27	15.61%
3.0.9	23	13.29%
3.1.0	16	9.25%
3.1.2	15	8.67%
3.1.5	9	5.20%
3.0.8	3	1.73%
3.1.1	2	1.16%
3.0.6	2	1.16%
Other	1	0.58%
WebSTAR V (135 servers)
Version	Number of Servers	Percent
5.4.1	44	32.59%
5.4.0	36	26.67%
5.3.4	32	23.70%
5.3.3	10	7.41%
5.3.2	9	6.67%
5.3.1	2	1.48%
Other	2	1.48%
Mercury (126 servers)
Version	Number of Servers	Percent
1.48	61	48.41%
3.32	38	30.16%
3.21c	9	7.14%
1.47	5	3.97%
3.31	5	3.97%
3.21	2	1.59%
1.49	2	1.59%
Other	4	3.17%
ModusMail (73 servers)
Version	Number of Servers	Percent
3.2.315.0	16	21.92%
4.35.480.0	11	15.07%
4.35.477.0	10	13.70%
4.35.480.11	6	8.22%
3.1.302.0	6	8.22%
4.2.420.0	6	8.22%
4.3.459.0	5	6.85%
4.1.361.21	3	4.11%
4.2.425.4	2	2.74%
3.1.293.1	2	2.74%
4.2.425.22	1	1.37%
4.1.361.0	1	1.37%
4.0.340.3	1	1.37%
4.0.330.8	1	1.37%
1.4.232.0	1	1.37%
4.35.477.8	1	1.37%
Other	0	0.00%
MessageWall (58 servers)
Version	Number of Servers	Percent
1.0.8	41	70.69%
1.0.11	14	24.14%
1.1.0	2	3.45%
1.0.6	1	1.72%
Other	0	0.00%
WebSTAR (52 servers)
Version	Number of Servers	Percent
Other	52	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	7	14.29%
4.3.1.0	5	10.20%
4.2.10.0	4	8.16%
4.3.6.0	3	6.12%
4.3.19.0	2	4.08%
4.3.10.0	2	4.08%
4.2.1.0	1	2.04%
4.3.12.0	1	2.04%
4.1.5.0	1	2.04%
4.2.5.0	1	2.04%
Other	0	0.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	15	60.00%
7.3	5	20.00%
8.2	2	8.00%
7.2	2	8.00%
6.1	1	4.00%
Other	0	0.00%