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	1,578,887	100.0%
Number of Servers that didn't respond	217,310	13.76%
Server didn't open socket	210,573	13.34%
Server didn't provide banner	6,737	0.43%
Server provided banner	1,361,577	86.24%
Server banner identifies software in use	874,005	55.36%

As indicated by the above table, of the 1,578,887 servers queried, only 874,005 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	311,623	35.65%
Microsoft	173,909	19.90%
Exim	138,099	15.80%
Postfix	102,124	11.68%
IMail	51,077	5.84%
MDaemon	20,152	2.31%
MailEnable	15,264	1.75%
Lotus Domino	9,396	1.08%
Merak	8,280	0.95%
CommuniGate Pro	5,697	0.65%
GroupWise	5,317	0.61%
Trend Micro	4,653	0.53%
Kerio	3,321	0.38%
ArGoSoft	3,215	0.37%
WinWebMail	3,197	0.37%
NetIQ MailMarshal	2,511	0.29%
XMail	2,183	0.25%
Gordano Messaging Suite (GMS)	2,015	0.23%
Interscan	1,958	0.22%
Post.Office	1,579	0.18%
SurgeSMTP	1,479	0.17%
ModusMail	1,367	0.16%
InterScan VirusWall	1,362	0.16%
Qmail Toaster	776	0.09%
VisNetic	765	0.09%
MAILsweeper	667	0.08%
Mercury	491	0.06%
WebSTAR V	435	0.05%
Mirapoint	417	0.05%
WebSTAR	226	0.03%
MessageWall	219	0.03%
Neon Mail Server	131	0.01%
MagicMail	66	0.01%
OpenVMS	34	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (311,623 servers)
Version	Number of Servers	Percent
8.13.6	90,861	29.16%
8.11.6	55,468	17.80%
8.12.10	31,896	10.24%
8.12.11.20060308	21,571	6.92%
8.12.11	18,113	5.81%
8.13.1	16,331	5.24%
8.12.8	14,886	4.78%
8.13.4	11,996	3.85%
8.10.2	10,907	3.50%
8.9.3	10,577	3.39%
8.11.7	4,601	1.48%
8.13.3	4,154	1.33%
8.12.9	3,983	1.28%
Other	16,279	5.22%
Microsoft (173,909 servers)
Version	Number of Servers	Percent
6.0.3790.1830	83,609	48.08%
5.0.2195.6713	48,013	27.61%
6.0.3790.211	25,772	14.82%
5.5.2653.13	4,906	2.82%
6.0.3790.0	4,455	2.56%
5.0.2195.5329	1,856	1.07%
Other	5,298	3.05%
Exim (138,099 servers)
Version	Number of Servers	Percent
4.52	99,244	71.86%
4.50	10,268	7.44%
4.60	6,132	4.44%
4.44	3,906	2.83%
4.43	2,735	1.98%
3.36	2,202	1.59%
3.35	1,935	1.40%
4.42	1,713	1.24%
4.54	1,591	1.15%
4.34	1,417	1.03%
Other	6,956	5.04%
Postfix (102,124 servers)
Version	Number of Servers	Percent
Other	102,124	100.00%
IMail (51,077 servers)
Version	Number of Servers	Percent
8.15	14,271	27.94%
8.05	6,560	12.84%
6.06	6,465	12.66%
8.22	4,194	8.21%
8.21	3,880	7.60%
7.07	2,336	4.57%
7.15	2,111	4.13%
8.20	1,357	2.66%
8.10	874	1.71%
9.03	820	1.61%
8.14	764	1.50%
8.00	752	1.47%
8.13	616	1.21%
8.12	598	1.17%
8.02	568	1.11%
Other	4,911	9.61%
MDaemon (20,152 servers)
Version	Number of Servers	Percent
8.1.3	3,491	17.32%
8.1.4	2,334	11.58%
8.1.5	1,566	7.77%
6.8.5	1,440	7.15%
7.2.3	1,243	6.17%
7.2.0	1,083	5.37%
9.0.0	996	4.94%
8.0.2	815	4.04%
8.1.1	725	3.60%
8.0.3	647	3.21%
7.1.0	545	2.70%
7.1.2	527	2.62%
8.0.1	519	2.58%
7.2.2	504	2.50%
6.8.4	468	2.32%
7.2.1	432	2.14%
7.0.1	430	2.13%
8.1.2	261	1.30%
Other	2,126	10.55%
MailEnable (15,264 servers)
Version	Number of Servers	Percent
1.8--	3,508	22.98%
1.9--	1,689	11.07%
0-1.75-	1,175	7.70%
0-1.54-	1,076	7.05%
0-1.6-	874	5.73%
0-1.72-	597	3.91%
1.73--	537	3.52%
0-1.71-	524	3.43%
1.91--	519	3.40%
1.92--	477	3.12%
1.95--	397	2.60%
1.71--	386	2.53%
0--1.1	346	2.27%
0--1.23	312	2.04%
0-1.7-	237	1.55%
0--1.2	218	1.43%
1.72--	186	1.22%
Other	2,206	14.45%
Lotus Domino (9,396 servers)
Version	Number of Servers	Percent
6.5.4	1,100	11.71%
6.5.1	1,054	11.22%
6.5.3	791	8.42%
6.5	559	5.95%
7.0	533	5.67%
5.0.11	517	5.50%
6.5.2	483	5.14%
6.5.5	381	4.05%
5.0.12	360	3.83%
7.0.1	347	3.69%
6.5.4FP2	298	3.17%
5.0.8	294	3.13%
5.0.10	263	2.80%
6.5.4FP1	228	2.43%
5.0.13a	224	2.38%
6.0.3	214	2.28%
6.0.2CF1	211	2.25%
6.0	161	1.71%
5.0.9	154	1.64%
6.5.3FP1	124	1.32%
5.0.5	123	1.31%
5.0.6a	103	1.10%
6.0.1	102	1.09%
5.0.9a	95	1.01%
Other	677	7.21%
Merak (8,280 servers)
Version	Number of Servers	Percent
8.3.8	1,923	23.22%
8.0.3	1,729	20.88%
7.4.5	544	6.57%
8.2.4	403	4.87%
7.6.4	400	4.83%
7.5.2	383	4.63%
7.4.2	281	3.39%
8.3.0	231	2.79%
7.2.0	225	2.72%
7.4.0	178	2.15%
6.2.1	168	2.03%
8.3.6	142	1.71%
4.4.2	133	1.61%
7.6.1	107	1.29%
5.5.7	105	1.27%
5.9.4	102	1.23%
5.8.6	88	1.06%
7.0.1	87	1.05%
Other	1,051	12.69%
CommuniGate Pro (5,697 servers)
Version	Number of Servers	Percent
4.1.8	987	17.32%
4.2.10	582	10.22%
5.0.8	319	5.60%
4.2.4	260	4.56%
4.2.8	230	4.04%
4.2	223	3.91%
4.3.8	213	3.74%
4.2.9	192	3.37%
4.2.7	178	3.12%
5.0.9	171	3.00%
5.0.6	162	2.84%
4.3.6	161	2.83%
4.0.6	151	2.65%
3.5.9	122	2.14%
4.0.1	99	1.74%
4.3.7	99	1.74%
4.3.4	90	1.58%
4.3.9	90	1.58%
5.0.1	87	1.53%
4.2.6	84	1.47%
5.0.7	83	1.46%
4.2.5	82	1.44%
4.2.3	75	1.32%
5.0.2	74	1.30%
4.1.6	66	1.16%
4.1.3	65	1.14%
4.0.5	64	1.12%
5.0	61	1.07%
5.0.4	58	1.02%
Other	569	9.99%
GroupWise (5,317 servers)
Version	Number of Servers	Percent
6.5.4	1,226	23.06%
7.0	741	13.94%
6.5.5	582	10.95%
6.0.4	523	9.84%
6.5.1	434	8.16%
6.5.2	289	5.44%
6.5.3	268	5.04%
6.0.2	193	3.63%
6.0.3	169	3.18%
6.5.0	167	3.14%
6.5.6	162	3.05%
5.5.5	160	3.01%
6.0.1	110	2.07%
7.0.1	62	1.17%
5.5.4	60	1.13%
Other	171	3.22%
Trend Micro (4,653 servers)
Version	Number of Servers	Percent
5.5	3,601	77.39%
5.7	521	11.20%
5.18	432	9.28%
5.15	69	1.48%
Other	30	0.64%
Kerio (3,321 servers)
Version	Number of Servers	Percent
6.1.3	828	24.93%
6.1.2	565	17.01%
6.1.0	345	10.39%
6.1.1	258	7.77%
6.0.10	220	6.62%
6.0.3	133	4.00%
6.0.8	109	3.28%
5.7.10	98	2.95%
6.0.9	84	2.53%
6.0.6	84	2.53%
6.0.7	69	2.08%
5.7.9	48	1.45%
5.7.4	47	1.42%
6.0.1	45	1.36%
6.0.4	40	1.20%
6.0.5	39	1.17%
5.7.6	35	1.05%
Other	274	8.25%
ArGoSoft (3,215 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	627	19.50%
1.8 (1.8.8.1)	270	8.40%
1.8 (1.8.8.5)	224	6.97%
1.8 (1.8.8.3)	204	6.35%
1.8 (1.8.6.0)	172	5.35%
1.8 (1.8.8.4)	167	5.19%
1.8 (1.8.8.6)	157	4.88%
1.8 (1.8.8.2)	151	4.70%
1.8 (1.8.7.5)	107	3.33%
1.8 (1.8.5.9)	82	2.55%
1.8 (1.8.7.6)	68	2.12%
1.8 (1.8.7.3)	65	2.02%
1.8 (1.8.6.6)	59	1.84%
1.8 (1.8.7.7)	51	1.59%
1.8 (1.8.8.0)	44	1.37%
1.8 (1.8.4.7)	37	1.15%
1.8 (1.8.3.6)	36	1.12%
1.8 (1.8.7.1)	34	1.06%
Other	660	20.53%
WinWebMail (3,197 servers)
Version	Number of Servers	Percent
3.6.3.1	1,359	42.51%
3.7.0.5	733	22.93%
3.7.0.7	579	18.11%
3.7.0.3	462	14.45%
3.7.0.1	49	1.53%
Other	15	0.47%
NetIQ MailMarshal (2,511 servers)
Version	Number of Servers	Percent
6.0.3.8	1,735	69.10%
5.5.6.7	232	9.24%
6.1.3.15	134	5.34%
5.5.5.9	75	2.99%
5.5.4.16	68	2.71%
5.5.6.6	60	2.39%
5.5.6.5	50	1.99%
5.5.5.6	43	1.71%
5.5.4.17	34	1.35%
Other	80	3.19%
XMail (2,183 servers)
Version	Number of Servers	Percent
1.21	634	29.04%
1.22	568	26.02%
1.20	333	15.25%
1.17	243	11.13%
1.18	94	4.31%
1.12	69	3.16%
1.16	52	2.38%
1.10	47	2.15%
1.15	37	1.69%
1.11	35	1.60%
Other	71	3.25%
Gordano Messaging Suite (GMS) (2,015 servers)
Version	Number of Servers	Percent
Other	2,015	100.00%
Interscan (1,958 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	491	25.08%
3.81-Build_1022	218	11.13%
3.53 (build 2011)	202	10.32%
3.55 (build 1029)	159	8.12%
3.8-Build_3013	150	7.66%
3.53 (build 2017)	143	7.30%
3.53 (build 2013)	105	5.36%
3.52 (build 1375)	79	4.03%
3.55 (build 1020)	57	2.91%
3.53 (build 1493)	53	2.71%
3.8-Build_1080	42	2.15%
3.81-Build_1032	25	1.28%
3.8-Build_3065	22	1.12%
3.81-Build_1055	21	1.07%
3.55 (build 1018)	21	1.07%
Other	170	8.68%
Post.Office (1,579 servers)
Version	Number of Servers	Percent
3.5.3	655	41.48%
3.5.3J	167	10.58%
3.8.3	73	4.62%
3.6.3	70	4.43%
3.6.2	67	4.24%
3.1.2	56	3.55%
3.1.2J	56	3.55%
3.5.2	46	2.91%
3.9.1	44	2.79%
3.8.4	41	2.60%
3.6.0	31	1.96%
3.9.0	29	1.84%
3.6	28	1.77%
3.9.2	25	1.58%
3.9.1.3	17	1.08%
4.0.0.2	17	1.08%
4.0.0.1	16	1.01%
Other	141	8.93%
SurgeSMTP (1,479 servers)
Version	Number of Servers	Percent
3.6f5-5	651	44.02%
3.0c2-2	145	9.80%
3.5b3-3	137	9.26%
2.1c7-7	48	3.25%
3.7c-3	36	2.43%
3.7b-2	33	2.23%
2.2c10-10	29	1.96%
3.7a-15	28	1.89%
2.0g2-1	27	1.83%
1.6e2	27	1.83%
3.6f3-3	24	1.62%
1.8g3	22	1.49%
3.7b3-3	19	1.28%
3.7b-1	18	1.22%
3.6f4-4	17	1.15%
1.9b-1	16	1.08%
1.5d2	15	1.01%
2.2g3-1	15	1.01%
Other	172	11.63%
ModusMail (1,367 servers)
Version	Number of Servers	Percent
4.3.459.0	572	41.84%
4.2.425.22	172	12.58%
4.1.361.21	161	11.78%
4.2.425.4	94	6.88%
4.2.425.16	80	5.85%
3.2.315.0	56	4.10%
4.2.407.0	33	2.41%
4.1.361.0	31	2.27%
3.1.302.0	27	1.98%
4.0.340.0	24	1.76%
3.1.297.0	16	1.17%
4.2.420.0	14	1.02%
4.3.465.0	14	1.02%
Other	73	5.34%
InterScan VirusWall (1,362 servers)
Version	Number of Servers	Percent
Other	1,362	100.00%
Qmail Toaster (776 servers)
Version	Number of Servers	Percent
1.2	596	76.80%
1.0	178	22.94%
Other	2	0.26%
VisNetic (765 servers)
Version	Number of Servers	Percent
8.3.5.0	93	12.16%
7.2.4.1	72	9.41%
8.0.3.0	63	8.24%
5.8.6.6	61	7.97%
7.6.1.0	59	7.71%
8.0.3.1	51	6.67%
5.0.2.3	50	6.54%
6.2.2.0	49	6.41%
8.3.6	30	3.92%
5.5.8.3	30	3.92%
8.0.3	24	3.14%
5.4.5.4	23	3.01%
7.5.3.0	23	3.01%
8.3.0.1	19	2.48%
5.8.6.4	17	2.22%
5.3.5.0	16	2.09%
5.0.1	13	1.70%
6.0.9.0	13	1.70%
7.2.4.0	9	1.18%
5.0.2.1	8	1.05%
Other	42	5.49%
MAILsweeper (667 servers)
Version	Number of Servers	Percent
4.3.12.0	131	19.64%
4.3.19.0	125	18.74%
4.3.14.0	119	17.84%
4.3.17.0	108	16.19%
4.2.10.0	43	6.45%
4.3.1.0	38	5.70%
4.2.5.0	26	3.90%
4.3.10.0	26	3.90%
4.3.6.0	22	3.30%
4.2.1.0	19	2.85%
Other	10	1.50%
Mercury (491 servers)
Version	Number of Servers	Percent
1.48	220	44.81%
3.32	168	34.22%
3.21c	38	7.74%
3.31	22	4.48%
1.44	15	3.05%
1.47	12	2.44%
3.01a	7	1.43%
Other	9	1.83%
WebSTAR V (435 servers)
Version	Number of Servers	Percent
5.4.0	138	31.72%
5.4.1	109	25.06%
5.3.4	99	22.76%
5.3.3	39	8.97%
5.3.2	29	6.67%
5.3.0	10	2.30%
5.2.4	6	1.38%
5.3.1	5	1.15%
Other	0	0.00%
Mirapoint (417 servers)
Version	Number of Servers	Percent
3.7.3a-GA	56	13.43%
3.7.4b-GA	46	11.03%
3.7.2-GA	44	10.55%
3.5.8-GR	42	10.07%
3.7.1-GA	40	9.59%
3.5.9-GR	23	5.52%
3.7.3-GA	19	4.56%
3.7.0-GA	18	4.32%
3.6.5-GR	17	4.08%
3.6.4-CR	13	3.12%
3.6.6-GR	12	2.88%
1.1.0	11	2.64%
3.7.5-GA	9	2.16%
3.5.7-GR	7	1.68%
3.5.3-GR	6	1.44%
3.5.6-GR	6	1.44%
3.2.2-GA	5	1.20%
3.7.4a-GA	5	1.20%
Other	38	9.11%
WebSTAR (226 servers)
Version	Number of Servers	Percent
Other	226	100.00%
MessageWall (219 servers)
Version	Number of Servers	Percent
1.0.8	183	83.56%
1.0.9	15	6.85%
1.1.23	7	3.20%
1.1.0	6	2.74%
1.0.6	5	2.28%
Other	3	1.37%
Neon Mail Server (131 servers)
Version	Number of Servers	Percent
3.0.7	96	73.28%
3.0.8	20	15.27%
3.0.6	10	7.63%
3.0.5	3	2.29%
3.0.4	2	1.53%
Other	0	0.00%
MagicMail (66 servers)
Version	Number of Servers	Percent
Other	66	100.00%
OpenVMS (34 servers)
Version	Number of Servers	Percent
7.3	16	47.06%
8.2	8	23.53%
7.2	6	17.65%
6.1	2	5.88%
7.1	2	5.88%
Other	0	0.00%