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	1,605,645	100.0%
Number of Servers that didn't respond	217,240	13.53%
Server didn't open socket	210,036	13.08%
Server didn't provide banner	7,204	0.45%
Server provided banner	1,388,405	86.47%
Server banner identifies software in use	889,149	55.38%

As indicated by the above table, of the 1,605,645 servers queried, only 889,149 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
Sendmail	309,326	34.79%
Microsoft	178,798	20.11%
Exim	145,759	16.39%
Postfix	106,546	11.98%
IMail	50,246	5.65%
MDaemon	20,524	2.31%
MailEnable	16,179	1.82%
Lotus Domino	9,279	1.04%
Merak	8,432	0.95%
CommuniGate Pro	5,662	0.64%
GroupWise	5,158	0.58%
Trend Micro	4,721	0.53%
WinWebMail	3,514	0.40%
Kerio	3,484	0.39%
ArGoSoft	3,229	0.36%
NetIQ MailMarshal	2,317	0.26%
XMail	2,236	0.25%
Gordano Messaging Suite (GMS)	1,921	0.22%
Interscan	1,818	0.20%
Post.Office	1,542	0.17%
SurgeSMTP	1,537	0.17%
InterScan VirusWall	1,378	0.15%
ModusMail	1,316	0.15%
Qmail Toaster	879	0.10%
VisNetic	775	0.09%
MAILsweeper	581	0.07%
Mercury	460	0.05%
Mirapoint	440	0.05%
WebSTAR V	408	0.05%
WebSTAR	202	0.02%
MessageWall	201	0.02%
Neon Mail Server	149	0.02%
MagicMail	94	0.01%
OpenVMS	38	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (309,326 servers)
Version	Number of Servers	Percent
8.13.6	95,519	30.88%
8.11.6	52,643	17.02%
8.12.10	28,687	9.27%
8.12.11.20060308	28,604	9.25%
8.13.1	18,153	5.87%
8.12.11	17,453	5.64%
8.12.8	13,827	4.47%
8.13.4	12,291	3.97%
8.10.2	9,910	3.20%
8.9.3	8,883	2.87%
8.13.3	3,874	1.25%
8.12.9	3,625	1.17%
Other	15,857	5.13%
Microsoft (178,798 servers)
Version	Number of Servers	Percent
6.0.3790.1830	94,097	52.63%
5.0.2195.6713	45,541	25.47%
6.0.3790.211	24,139	13.50%
5.5.2653.13	4,420	2.47%
6.0.3790.0	4,077	2.28%
Other	6,524	3.65%
Exim (145,759 servers)
Version	Number of Servers	Percent
4.52	106,171	72.84%
4.50	10,430	7.16%
4.60	5,547	3.81%
4.44	3,515	2.41%
4.62	3,360	2.31%
4.43	2,205	1.51%
3.36	2,134	1.46%
3.35	1,772	1.22%
4.42	1,624	1.11%
Other	9,001	6.18%
Postfix (106,546 servers)
Version	Number of Servers	Percent
Other	106,546	100.00%
IMail (50,246 servers)
Version	Number of Servers	Percent
8.15	14,637	29.13%
6.06	6,179	12.30%
8.05	6,114	12.17%
8.22	4,378	8.71%
8.21	3,469	6.90%
7.15	2,115	4.21%
7.07	2,081	4.14%
8.20	1,161	2.31%
9.04	1,001	1.99%
8.10	824	1.64%
9.03	777	1.55%
8.14	740	1.47%
8.00	721	1.43%
8.12	537	1.07%
8.02	536	1.07%
8.13	535	1.06%
Other	4,441	8.84%
MDaemon (20,524 servers)
Version	Number of Servers	Percent
9.0.1	3,038	14.80%
8.1.3	2,720	13.25%
8.1.4	1,516	7.39%
6.8.5	1,377	6.71%
9.0.0	1,270	6.19%
7.2.3	1,154	5.62%
7.2.0	1,044	5.09%
8.0.2	764	3.72%
8.1.5	734	3.58%
8.1.1	634	3.09%
8.0.3	613	2.99%
7.1.2	505	2.46%
7.1.0	496	2.42%
7.2.2	478	2.33%
6.8.4	431	2.10%
7.2.1	405	1.97%
8.0.1	388	1.89%
7.0.1	385	1.88%
9.0.4	243	1.18%
8.1.2	219	1.07%
Other	2,110	10.28%
MailEnable (16,179 servers)
Version	Number of Servers	Percent
1.8--	3,185	19.69%
1.9--	2,093	12.94%
0-1.75-	1,549	9.57%
1.95--	1,322	8.17%
0-1.54-	890	5.50%
0-1.6-	735	4.54%
1.73--	504	3.12%
0-1.72-	479	2.96%
0-1.71-	420	2.60%
1.91--	408	2.52%
1.92--	374	2.31%
1.71--	343	2.12%
0--1.23	307	1.90%
0--1.1	218	1.35%
1.72--	164	1.01%
Other	3,188	19.70%
Lotus Domino (9,279 servers)
Version	Number of Servers	Percent
6.5.4	1,042	11.23%
6.5.1	987	10.64%
6.5.3	757	8.16%
7.0.1	621	6.69%
7.0	535	5.77%
6.5	522	5.63%
5.0.11	481	5.18%
6.5.5	477	5.14%
6.5.2	458	4.94%
5.0.12	329	3.55%
6.5.4FP2	288	3.10%
5.0.8	281	3.03%
5.0.10	228	2.46%
5.0.13a	215	2.32%
6.5.4FP1	215	2.32%
6.0.3	195	2.10%
6.0.2CF1	187	2.02%
6.0	156	1.68%
5.0.9	133	1.43%
6.5.3FP1	114	1.23%
6.0.1	107	1.15%
5.0.5	106	1.14%
Other	845	9.11%
Merak (8,432 servers)
Version	Number of Servers	Percent
8.3.8	2,003	23.75%
8.0.3	1,774	21.04%
7.4.5	519	6.16%
7.5.2	397	4.71%
7.6.4	396	4.70%
8.2.4	347	4.12%
8.5.0	319	3.78%
7.4.2	258	3.06%
7.2.0	220	2.61%
8.3.0	199	2.36%
6.2.1	173	2.05%
7.4.0	131	1.55%
4.4.2	130	1.54%
8.3.6	109	1.29%
7.6.1	104	1.23%
5.9.4	99	1.17%
5.5.7	98	1.16%
5.8.6	88	1.04%
Other	1,068	12.67%
CommuniGate Pro (5,662 servers)
Version	Number of Servers	Percent
4.1.8	971	17.15%
4.2.10	572	10.10%
5.0.9	483	8.53%
5.0.8	305	5.39%
4.2.4	259	4.57%
4.2.8	217	3.83%
4.2	194	3.43%
4.3.8	194	3.43%
4.2.7	165	2.91%
4.2.9	153	2.70%
4.0.6	151	2.67%
4.3.6	150	2.65%
5.0.6	147	2.60%
3.5.9	114	2.01%
4.0.1	95	1.68%
4.3.7	89	1.57%
4.3.9	84	1.48%
5.0.1	81	1.43%
4.3.4	79	1.40%
4.2.5	75	1.32%
4.2.3	73	1.29%
5.0.2	71	1.25%
5.0.7	67	1.18%
4.1.3	63	1.11%
4.2.6	63	1.11%
4.1.6	60	1.06%
4.0.5	59	1.04%
Other	628	11.09%
GroupWise (5,158 servers)
Version	Number of Servers	Percent
6.5.4	1,108	21.48%
7.0	761	14.75%
6.5.5	536	10.39%
6.0.4	497	9.64%
6.5.1	395	7.66%
6.5.6	283	5.49%
6.5.2	244	4.73%
6.5.3	235	4.56%
6.0.2	174	3.37%
6.0.3	157	3.04%
6.5.0	154	2.99%
7.0.1	144	2.79%
5.5.5	141	2.73%
6.0.1	98	1.90%
5.5.4	52	1.01%
Other	179	3.47%
Trend Micro (4,721 servers)
Version	Number of Servers	Percent
5.5	3,445	72.97%
5.7	736	15.59%
5.18	452	9.57%
5.15	55	1.17%
Other	33	0.70%
WinWebMail (3,514 servers)
Version	Number of Servers	Percent
3.6.3.1	1,223	34.80%
3.7.0.5	698	19.86%
3.7.0.7	640	18.21%
3.7.1.1	451	12.83%
3.7.0.3	446	12.69%
3.7.0.1	41	1.17%
Other	15	0.43%
Kerio (3,484 servers)
Version	Number of Servers	Percent
6.1.3	662	19.00%
6.1.4	614	17.62%
6.1.2	453	13.00%
6.1.0	301	8.64%
6.1.1	207	5.94%
6.0.10	202	5.80%
6.0.3	128	3.67%
6.0.8	100	2.87%
5.7.10	89	2.55%
6.0.6	84	2.41%
6.0.9	73	2.10%
6.0.7	65	1.87%
5.7.9	47	1.35%
5.7.4	45	1.29%
6.0.1	41	1.18%
6.0.5	39	1.12%
6.0.4	38	1.09%
Other	296	8.50%
ArGoSoft (3,229 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	1,051	32.55%
1.8 (1.8.8.1)	218	6.75%
1.8 (1.8.6.0)	161	4.99%
1.8 (1.8.8.3)	160	4.96%
1.8 (1.8.8.5)	145	4.49%
1.8 (1.8.8.4)	137	4.24%
1.8 (1.8.8.2)	131	4.06%
1.8 (1.8.8.6)	117	3.62%
1.8 (1.8.7.5)	98	3.03%
1.8 (1.8.5.9)	67	2.07%
1.8 (1.8.7.6)	60	1.86%
1.8 (1.8.6.6)	54	1.67%
1.8 (1.8.7.7)	52	1.61%
1.8 (1.8.7.3)	51	1.58%
1.8 (1.8.7.1)	35	1.08%
1.8 (1.8.4.7)	34	1.05%
1.8 (1.8.3.6)	33	1.02%
Other	625	19.36%
NetIQ MailMarshal (2,317 servers)
Version	Number of Servers	Percent
6.0.3.8	1,628	70.26%
5.5.6.7	210	9.06%
6.1.3.15	115	4.96%
5.5.4.16	70	3.02%
5.5.5.9	63	2.72%
5.5.6.6	52	2.24%
5.5.6.5	47	2.03%
5.5.4.17	31	1.34%
5.5.5.6	25	1.08%
Other	76	3.28%
XMail (2,236 servers)
Version	Number of Servers	Percent
1.22	708	31.66%
1.21	601	26.88%
1.20	295	13.19%
1.17	239	10.69%
1.18	93	4.16%
1.12	69	3.09%
1.16	50	2.24%
1.10	40	1.79%
1.15	34	1.52%
1.11	34	1.52%
Other	73	3.26%
Gordano Messaging Suite (GMS) (1,921 servers)
Version	Number of Servers	Percent
Other	1,921	100.00%
Interscan (1,818 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	452	24.86%
3.81-Build_1022	207	11.39%
3.53 (build 2011)	183	10.07%
3.55 (build 1029)	151	8.31%
3.8-Build_3013	141	7.76%
3.53 (build 2017)	131	7.21%
3.53 (build 2013)	97	5.34%
3.52 (build 1375)	75	4.13%
3.55 (build 1020)	57	3.14%
3.53 (build 1493)	48	2.64%
3.8-Build_1080	39	2.15%
3.81-Build_1032	25	1.38%
3.81-Build_1055	20	1.10%
3.55 (build 1018)	20	1.10%
3.81-Build_1021	19	1.05%
Other	153	8.42%
Post.Office (1,542 servers)
Version	Number of Servers	Percent
3.5.3	613	39.75%
3.5.3J	160	10.38%
3.8.3	79	5.12%
3.6.3	72	4.67%
3.6.2	63	4.09%
3.1.2J	55	3.57%
3.1.2	54	3.50%
3.9.1	45	2.92%
3.8.4	41	2.66%
3.5.2	41	2.66%
3.6.0	30	1.95%
3.9.2	30	1.95%
3.9.0	29	1.88%
4.0.0.2	23	1.49%
3.6	19	1.23%
3.9.1.3	16	1.04%
Other	172	11.15%
SurgeSMTP (1,537 servers)
Version	Number of Servers	Percent
3.7b6-6	455	29.60%
3.6f5-5	328	21.34%
3.0c2-2	149	9.69%
3.5b3-3	144	9.37%
2.1c7-7	49	3.19%
3.7c-3	34	2.21%
1.6e2	28	1.82%
2.0g2-1	25	1.63%
2.2c10-10	25	1.63%
3.6f3-3	25	1.63%
1.8g3	21	1.37%
3.7b8-8	18	1.17%
3.7b3-3	16	1.04%
Other	220	14.31%
InterScan VirusWall (1,378 servers)
Version	Number of Servers	Percent
Other	1,378	100.00%
ModusMail (1,316 servers)
Version	Number of Servers	Percent
4.3.459.0	389	29.56%
4.35.477.0	272	20.67%
4.2.425.22	169	12.84%
4.1.361.21	138	10.49%
4.2.425.16	60	4.56%
3.2.315.0	56	4.26%
4.2.425.4	49	3.72%
4.2.407.0	29	2.20%
3.1.302.0	27	2.05%
4.1.361.0	27	2.05%
3.1.297.0	17	1.29%
4.0.340.0	15	1.14%
Other	68	5.17%
Qmail Toaster (879 servers)
Version	Number of Servers	Percent
1.2	684	77.82%
1.0	166	18.89%
1.3	28	3.19%
Other	1	0.11%
VisNetic (775 servers)
Version	Number of Servers	Percent
8.3.5.0	113	14.58%
7.2.4.1	80	10.32%
8.0.3.0	73	9.42%
7.6.1.0	51	6.58%
5.8.6.6	50	6.45%
5.0.2.3	48	6.19%
8.0.3.1	46	5.94%
6.2.2.0	45	5.81%
8.3.6	42	5.42%
5.5.8.3	28	3.61%
5.4.5.4	25	3.23%
7.5.3.0	24	3.10%
8.0.3	21	2.71%
5.8.6.4	16	2.06%
8.3.0.1	16	2.06%
5.3.5.0	15	1.94%
5.0.1	12	1.55%
6.0.9.0	12	1.55%
7.2.4.0	11	1.42%
5.0.2.1	8	1.03%
Other	39	5.03%
MAILsweeper (581 servers)
Version	Number of Servers	Percent
4.3.19.0	112	19.28%
4.3.12.0	109	18.76%
4.3.14.0	101	17.38%
4.3.17.0	100	17.21%
4.2.10.0	39	6.71%
4.3.1.0	29	4.99%
4.2.5.0	24	4.13%
4.3.10.0	21	3.61%
4.3.6.0	18	3.10%
4.2.1.0	18	3.10%
Other	10	1.72%
Mercury (460 servers)
Version	Number of Servers	Percent
1.48	204	44.35%
3.32	158	34.35%
3.21c	35	7.61%
3.31	22	4.78%
1.44	15	3.26%
1.47	10	2.17%
3.01a	8	1.74%
Other	8	1.74%
Mirapoint (440 servers)
Version	Number of Servers	Percent
3.7.3a-GA	61	13.86%
3.7.5-GA	53	12.05%
3.7.4b-GA	45	10.23%
3.7.2-GA	39	8.86%
3.7.1-GA	36	8.18%
3.5.8-GR	32	7.27%
3.7.3-GA	16	3.64%
3.7.0-GA	16	3.64%
3.8.0-FCS	16	3.64%
3.5.9-GR	13	2.95%
3.6.5-GR	13	2.95%
3.6.4-CR	11	2.50%
3.7.5a-GA	11	2.50%
1.1.0	10	2.27%
3.6.6-GR	9	2.05%
3.5.7-GR	6	1.36%
3.4.6-GR	5	1.14%
3.5.6-GR	5	1.14%
Other	43	9.77%
WebSTAR V (408 servers)
Version	Number of Servers	Percent
5.4.0	124	30.39%
5.4.1	108	26.47%
5.3.4	88	21.57%
5.3.3	39	9.56%
5.3.2	26	6.37%
5.3.0	11	2.70%
5.2.4	6	1.47%
5.3.1	5	1.23%
Other	1	0.25%
WebSTAR (202 servers)
Version	Number of Servers	Percent
Other	202	100.00%
MessageWall (201 servers)
Version	Number of Servers	Percent
1.0.8	160	79.60%
1.0.10	18	8.96%
1.1.23	7	3.48%
1.1.0	6	2.99%
1.0.6	5	2.49%
Other	5	2.49%
Neon Mail Server (149 servers)
Version	Number of Servers	Percent
3.0.7	90	60.40%
3.0.9	30	20.13%
3.0.8	15	10.07%
3.0.6	9	6.04%
3.0.4	2	1.34%
3.0.5	2	1.34%
Other	1	0.67%
MagicMail (94 servers)
Version	Number of Servers	Percent
Other	94	100.00%
OpenVMS (38 servers)
Version	Number of Servers	Percent
7.3	15	39.47%
8.2	10	26.32%
7.2	9	23.68%
6.1	2	5.26%
7.1	2	5.26%
Other	0	0.00%