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	2,349,554	100.0%
Number of Servers that didn't respond	391,316	16.65%
Server didn't open socket	380,925	16.21%
Server didn't provide banner	10,391	0.44%
Server provided banner	1,958,238	83.35%
Server banner identifies software in use	1,074,927	45.75%

As indicated by the above table, of the 2,349,554 servers queried, only 1,074,927 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	518,692	48.25%
Postfix	266,215	24.77%
Sendmail	116,698	10.86%
Microsoft	91,672	8.53%
MailEnable	33,163	3.09%
MDaemon	20,080	1.87%
IMail	7,239	0.67%
Lotus Domino	4,366	0.41%
WinWebMail	3,117	0.29%
CommuniGate Pro	3,063	0.28%
XMail	2,072	0.19%
Qmail Toaster	1,590	0.15%
Kerio	1,576	0.15%
Merak	1,203	0.11%
SurgeSMTP	1,015	0.09%
ArGoSoft	729	0.07%
GroupWise	486	0.05%
Post.Office	338	0.03%
Gordano Messaging Suite (GMS)	323	0.03%
Trend Micro	318	0.03%
MagicMail	315	0.03%
Mirapoint	153	0.01%
InterScan VirusWall	122	0.01%
VisNetic	122	0.01%
Mercury	45	0.00%
Interscan	39	0.00%
NetIQ MailMarshal	32	0.00%
WebSTAR V	30	0.00%
Neon Mail Server	27	0.00%
OpenSMTPD	20	0.00%
OpenVMS	19	0.00%
MessageWall	18	0.00%
WebSTAR	14	0.00%
ModusMail	12	0.00%
MAILsweeper	4	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (518,692 servers)
Version	Number of Servers	Percent
4.80	345,641	66.64%
4.76	50,631	9.76%
4.77	31,278	6.03%
4.69	29,029	5.60%
4.72	23,754	4.58%
4.80.1	13,295	2.56%
4.67	5,786	1.12%
Other	19,278	3.72%
Postfix (266,215 servers)
Version	Number of Servers	Percent
Other	266,215	100.00%
Sendmail (116,698 servers)
Version	Number of Servers	Percent
8.13.8	31,187	26.72%
8.13.1	18,090	15.50%
8.14.3	15,615	13.38%
8.14.5	13,298	11.40%
8.14.4	11,280	9.67%
8.12.11.20060308	4,543	3.89%
8.13.6.20060614	3,553	3.04%
8.14.2	3,185	2.73%
8.11.6	2,180	1.87%
8.12.10	1,944	1.67%
8.14.1	1,767	1.51%
8.13.6	1,587	1.36%
8.13.7	1,383	1.19%
8.12.11.20060614	1,319	1.13%
Other	5,767	4.94%
Microsoft (91,672 servers)
Version	Number of Servers	Percent
6.0.3790.4675	74,015	80.74%
6.0.3790.3959	9,889	10.79%
6.0.3790.1830	2,709	2.96%
7.5.7601.17514	1,582	1.73%
5.0.2195.7381	960	1.05%
Other	2,517	2.75%
MailEnable (33,163 servers)
Version	Number of Servers	Percent
1.986--	6,901	20.81%
5.10--	2,625	7.92%
4.26--	2,202	6.64%
6.5--	1,439	4.34%
6.0--	1,317	3.97%
1.981--	1,195	3.60%
1.983--	745	2.25%
0-3.63-	684	2.06%
6.03--	623	1.88%
3.62--	602	1.82%
5.51--	600	1.81%
6.60--	531	1.60%
5.11--	506	1.53%
6.53--	429	1.29%
0-1.87-	374	1.13%
Other	12,390	37.36%
MDaemon (20,080 servers)
Version	Number of Servers	Percent
13.0.3	2,642	13.16%
11.0.3	1,916	9.54%
13.0.2	1,414	7.04%
11.0.0	1,241	6.18%
12.5.6	1,064	5.30%
10.0.0	765	3.81%
10.1.2	665	3.31%
10.1.1	621	3.09%
9.6.1	482	2.40%
12.5.4	470	2.34%
9.6.6	452	2.25%
10.1.0	424	2.11%
13.0.1	394	1.96%
13.0.0	364	1.81%
12.0.3	336	1.67%
12.5.8	315	1.57%
12.5.3	312	1.55%
9.6.2	291	1.45%
9.5.2	268	1.33%
9.6.5	255	1.27%
10.0.5	254	1.26%
12.5.7	249	1.24%
10.0.2	242	1.21%
9.5.6	219	1.09%
9.5.1	210	1.05%
9.6.4	208	1.04%
12.0.4	208	1.04%
Other	3,799	18.92%
IMail (7,239 servers)
Version	Number of Servers	Percent
8.22	1,296	17.90%
11.5	841	11.62%
12.1.0.270	584	8.07%
12.2.0.169	498	6.88%
8.15	431	5.95%
9.23	427	5.90%
11.03	394	5.44%
11.01	359	4.96%
8.05	284	3.92%
10.02	204	2.82%
12.0.0.384	169	2.33%
7.07	162	2.24%
7.15	133	1.84%
6.06	121	1.67%
11.0	116	1.60%
8.00	113	1.56%
11.02	108	1.49%
12.0.0.348	103	1.42%
10.01	102	1.41%
9.21	76	1.05%
Other	718	9.92%
Lotus Domino (4,366 servers)
Version	Number of Servers	Percent
8.5.3	804	18.42%
8.5.3FP2	317	7.26%
8.5.2	300	6.87%
8.5.3FP1	218	4.99%
8.5.2FP2	217	4.97%
8.5.1	203	4.65%
7.0.2	182	4.17%
8.5	148	3.39%
8.5.2FP3	131	3.00%
8.5.2FP4	108	2.47%
7.0.3	99	2.27%
8.5.2FP1	87	1.99%
8.5.1FP5	85	1.95%
7.0.1	83	1.90%
8.0.2	78	1.79%
8.0.1	78	1.79%
6.5.4	72	1.65%
7.0	71	1.63%
6.5.3	69	1.58%
6.5.1	68	1.56%
8.5.3FP3	62	1.42%
8.0	60	1.37%
6.5.5	48	1.10%
8.5.1FP3	44	1.01%
Other	734	16.81%
WinWebMail (3,117 servers)
Version	Number of Servers	Percent
3.8.1.3	615	19.73%
3.8.0.1	405	12.99%
3.7.6.1	336	10.78%
3.8.1.5	275	8.82%
3.8.2.1	242	7.76%
3.7.3.1	235	7.54%
3.8.1.1	231	7.41%
3.7.7.3	213	6.83%
3.7.1.1	119	3.82%
3.8.3.1	117	3.75%
3.7.5.1	88	2.82%
3.7.7.1	50	1.60%
3.6.3.1	48	1.54%
3.7.0.3	45	1.44%
3.7.0.5	41	1.32%
3.7.0.7	35	1.12%
Other	22	0.71%
CommuniGate Pro (3,063 servers)
Version	Number of Servers	Percent
5.1.16	267	8.72%
5.4.8	184	6.01%
4.1.8	124	4.05%
5.4.4	121	3.95%
5.4.6	113	3.69%
5.2.20	104	3.40%
5.3.13	87	2.84%
5.4.5	84	2.74%
5.4.7	80	2.61%
5.4.1	73	2.38%
4.2.10	72	2.35%
5.2.16	72	2.35%
5.1.12	63	2.06%
5.2.3	60	1.96%
5.3.15	60	1.96%
5.0.14	59	1.93%
5.2.19	58	1.89%
5.4.3	54	1.76%
5.4.2	48	1.57%
5.2.14	47	1.53%
6.0	46	1.50%
5.4.0	40	1.31%
5.2.12	37	1.21%
5.1.13	36	1.18%
5.3.8	36	1.18%
5.3.9	34	1.11%
5.2.13	34	1.11%
5.3.10	32	1.04%
Other	938	30.62%
XMail (2,072 servers)
Version	Number of Servers	Percent
1.27	564	27.22%
1.22	502	24.23%
1.25	354	17.08%
1.26	232	11.20%
1.24	154	7.43%
1.21	74	3.57%
1.23	44	2.12%
1.20	32	1.54%
1.17	31	1.50%
Other	85	4.10%
Qmail Toaster (1,590 servers)
Version	Number of Servers	Percent
1.3	1,509	94.91%
1.2	50	3.14%
Other	31	1.95%
Kerio (1,576 servers)
Version	Number of Servers	Percent
6.7.3	253	16.05%
6.6.2	157	9.96%
6.7.0	147	9.33%
6.5.0	121	7.68%
6.5.2	110	6.98%
6.7.2	91	5.77%
6.4.1	89	5.65%
6.7.1	81	5.14%
6.3.1	71	4.51%
6.4.0	57	3.62%
6.6.1	57	3.62%
6.6.0	52	3.30%
6.5.1	49	3.11%
6.4.2	35	2.22%
6.3.0	28	1.78%
6.0.10	20	1.27%
6.2.0	16	1.02%
Other	142	9.01%
Merak (1,203 servers)
Version	Number of Servers	Percent
8.0.3	474	39.40%
8.9.1	132	10.97%
8.5.0	85	7.07%
7.5.2	58	4.82%
8.3.8	52	4.32%
7.4.5	49	4.07%
7.6.4	48	3.99%
9.0.0	24	2.00%
7.4.2	21	1.75%
7.0.1	17	1.41%
7.6.1	17	1.41%
8.9.0	16	1.33%
7.2.0	16	1.33%
8.3.15	15	1.25%
6.2.1	14	1.16%
4.4.2	13	1.08%
Other	152	12.64%
SurgeSMTP (1,015 servers)
Version	Number of Servers	Percent
6.1c-1	199	19.61%
5.3h2-2	127	12.51%
5.2a-1	93	9.16%
6.2c-1	60	5.91%
3.9e-1	56	5.52%
6.0a5-5	41	4.04%
6.0a4-4	31	3.05%
3.8k4-4	29	2.86%
4.0u4-4	25	2.46%
5.0e4-4	18	1.77%
4.2d2-2	18	1.77%
4.3g2-2	17	1.67%
3.8i3-3	16	1.58%
5.0e3-3	12	1.18%
3.9h-18	12	1.18%
3.6f5-5	12	1.18%
4.2d4-4	11	1.08%
Other	238	23.45%
ArGoSoft (729 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	176	24.14%
1.8 (1.8.9.5)	102	13.99%
1.8 (1.8.9.3)	96	13.17%
1.8 (1.8.9.1)	76	10.43%
1.8 (1.8.8.8)	50	6.86%
1.8 (1.8.8.7)	42	5.76%
1.8 (1.8.9.2)	26	3.57%
1.8 (1.8.9.4)	21	2.88%
1.8 (1.8.6.0)	13	1.78%
1.8 (1.8.8.9)	12	1.65%
1.8 (1.8.8.1)	9	1.23%
Other	106	14.54%
GroupWise (486 servers)
Version	Number of Servers	Percent
7.0.3	91	18.72%
8.0.2	89	18.31%
6.5.7	52	10.70%
7.0.4	38	7.82%
7.0.2	30	6.17%
8.0.1	21	4.32%
7.0.1	21	4.32%
6.5.6	21	4.32%
6.5.4	18	3.70%
6.0.4	16	3.29%
8.0.3	15	3.09%
6.5.1	15	3.09%
12.0.1	11	2.26%
12.0.0	11	2.26%
7.0	8	1.65%
8.0.0	7	1.44%
6.5.5	6	1.23%
Other	16	3.29%
Post.Office (338 servers)
Version	Number of Servers	Percent
3.5.3	51	15.09%
4.1.0.2	32	9.47%
4.1.2.4	27	7.99%
4.0.1	22	6.51%
4.1.1	16	4.73%
3.5.3J	13	3.85%
3.9.2.3	11	3.25%
3.8.3	10	2.96%
4.1.0.3	9	2.66%
3.9.2	9	2.66%
4.2	9	2.66%
3.1.2	8	2.37%
3.1.2J	8	2.37%
3.8.7.4	7	2.07%
4.1.0.4	7	2.07%
3.9.1.2	6	1.78%
3.6.2	6	1.78%
4.0.1.1	6	1.78%
3.9.1	6	1.78%
4.0.0.1	5	1.48%
4.1.2.3	5	1.48%
4.1.2.2	5	1.48%
3.9.2.2	4	1.18%
4.1	4	1.18%
3.9.1.3	4	1.18%
4.2.1.3	4	1.18%
3.9.2.1	4	1.18%
4.2.1	4	1.18%
4.0.0.2	4	1.18%
4.2.1.1	4	1.18%
Other	28	8.28%
Gordano Messaging Suite (GMS) (323 servers)
Version	Number of Servers	Percent
Other	323	100.00%
Trend Micro (318 servers)
Version	Number of Servers	Percent
5.7	129	40.57%
5.5	76	23.90%
5.18	54	16.98%
7.0	30	9.43%
7.1	19	5.97%
Other	10	3.14%
MagicMail (315 servers)
Version	Number of Servers	Percent
Other	315	100.00%
Mirapoint (153 servers)
Version	Number of Servers	Percent
3.10.10a-GA	16	10.46%
4.1.10-GA	13	8.50%
4.2.3-GA	10	6.54%
3.10.9-GA	9	5.88%
4.3.5-GA	8	5.23%
3.10.5-GA	8	5.23%
3.10.8-GA	7	4.58%
4.1.9-GA	7	4.58%
4.2.4-GA	7	4.58%
4.1.4-GA	6	3.92%
4.3.3-GA	6	3.92%
4.1.3-GA	5	3.27%
3.8.5-GA	5	3.27%
4.3.4-GA	5	3.27%
3.10.7-GA	5	3.27%
3.8.3-GA	4	2.61%
3.8.4-GA	4	2.61%
4.1.8-GA	4	2.61%
3.10.4-GA	3	1.96%
4.1.5-GA	3	1.96%
3.7.5a-GA	2	1.31%
3.10.3-GA	2	1.31%
3.8.6-GA	2	1.31%
3.10.2-GA	2	1.31%
3.8.7a	2	1.31%
4.0.5a	2	1.31%
Other	6	3.92%
InterScan VirusWall (122 servers)
Version	Number of Servers	Percent
Other	122	100.00%
VisNetic (122 servers)
Version	Number of Servers	Percent
9.3.2.0	37	30.33%
9.1.4.1	17	13.93%
8.5.0.8	7	5.74%
5.5.8.3	7	5.74%
7.6.1.0	6	4.92%
8.0.3.1	4	3.28%
8.0.3.0	4	3.28%
8.0.3	4	3.28%
5.0.2.3	4	3.28%
5.8.6.6	3	2.46%
7.2.4.1	3	2.46%
9.1.4.0	3	2.46%
5.4.5.4	3	2.46%
8.3.5.0	2	1.64%
5.0.2.1	2	1.64%
6.2.2.0	2	1.64%
5.3.5.0	2	1.64%
5.8.6.4	2	1.64%
Other	10	8.20%
Mercury (45 servers)
Version	Number of Servers	Percent
1.48	23	51.11%
3.32	13	28.89%
3.01a	2	4.44%
1.47	2	4.44%
3.21c	2	4.44%
3.21	1	2.22%
4.x	1	2.22%
3.30	1	2.22%
Other	0	0.00%
Interscan (39 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	11	28.21%
3.81-Build_1022	6	15.38%
3.55 (build 1029)	5	12.82%
3.53 (build 2017)	3	7.69%
3.8-Build_3013	2	5.13%
3.53 (build 1493)	2	5.13%
3.53 (build 2013)	2	5.13%
3.81-Build_1084	2	5.13%
3.5 (build 1294)	1	2.56%
3.51 (build 1337)	1	2.56%
3.55 (build 1020)	1	2.56%
3.8-Build_3045	1	2.56%
3.53 (build 2011)	1	2.56%
3.8-Build_1080	1	2.56%
Other	0	0.00%
NetIQ MailMarshal (32 servers)
Version	Number of Servers	Percent
6.0.3.8	21	65.62%
5.5.6.7	3	9.38%
5.5.6.5	2	6.25%
5.5.6.6	2	6.25%
5.5.5.6	1	3.12%
5.5.4.17	1	3.12%
6.1.3.15	1	3.12%
5.5.4.16	1	3.12%
Other	0	0.00%
WebSTAR V (30 servers)
Version	Number of Servers	Percent
5.4.1	15	50.00%
5.4.0	8	26.67%
5.3.4	3	10.00%
5.3.3	2	6.67%
5.3.2	2	6.67%
Other	0	0.00%
Neon Mail Server (27 servers)
Version	Number of Servers	Percent
3.0.7	7	25.93%
3.1.3	5	18.52%
3.1.0	4	14.81%
3.1.4	3	11.11%
3.1.2	3	11.11%
3.0.9	2	7.41%
3.1.1	1	3.70%
3.1.5	1	3.70%
3.0.6	1	3.70%
Other	0	0.00%
OpenSMTPD (20 servers)
Version	Number of Servers	Percent
Other	20	100.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	8	42.11%
8.4	6	31.58%
7.3	4	21.05%
8.2	1	5.26%
Other	0	0.00%
MessageWall (18 servers)
Version	Number of Servers	Percent
1.0.8	17	94.44%
1.0.6	1	5.56%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (12 servers)
Version	Number of Servers	Percent
4.35.477.0	5	41.67%
4.35.480.0	2	16.67%
4.1.361.21	1	8.33%
4.0.340.3	1	8.33%
4.3.459.0	1	8.33%
4.35.477.8	1	8.33%
3.1.302.0	1	8.33%
Other	0	0.00%
MAILsweeper (4 servers)
Version	Number of Servers	Percent
4.3.17.0	2	50.00%
4.3.19.0	1	25.00%
4.3.20.0	1	25.00%
Other	0	0.00%