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	1,644,877	100.0%
Number of Servers that didn't respond	226,811	13.79%
Server didn't open socket	219,261	13.33%
Server didn't provide banner	7,550	0.46%
Server provided banner	1,418,066	86.21%
Server banner identifies software in use	903,001	54.90%

As indicated by the above table, of the 1,644,877 servers queried, only 903,001 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	302,184	33.46%
Microsoft	185,319	20.52%
Exim	155,322	17.20%
Postfix	112,574	12.47%
IMail	47,881	5.30%
MDaemon	20,870	2.31%
MailEnable	17,790	1.97%
Lotus Domino	8,986	1.00%
Merak	8,513	0.94%
CommuniGate Pro	5,634	0.62%
GroupWise	4,826	0.53%
Trend Micro	4,789	0.53%
WinWebMail	3,923	0.43%
Kerio	3,752	0.42%
ArGoSoft	3,224	0.36%
XMail	2,346	0.26%
NetIQ MailMarshal	1,878	0.21%
Gordano Messaging Suite (GMS)	1,821	0.20%
SurgeSMTP	1,624	0.18%
Interscan	1,567	0.17%
Post.Office	1,437	0.16%
InterScan VirusWall	1,357	0.15%
ModusMail	1,257	0.14%
Qmail Toaster	984	0.11%
VisNetic	756	0.08%
MAILsweeper	475	0.05%
Mirapoint	474	0.05%
Mercury	409	0.05%
WebSTAR V	369	0.04%
WebSTAR	180	0.02%
MessageWall	176	0.02%
Neon Mail Server	151	0.02%
MagicMail	118	0.01%
OpenVMS	35	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (302,184 servers)
Version	Number of Servers	Percent
8.12.11.20060614	53,340	17.65%
8.11.6	45,990	15.22%
8.13.6	30,132	9.97%
8.12.11.20060308	29,770	9.85%
8.12.10	25,838	8.55%
8.13.1	18,615	6.16%
8.12.11	15,947	5.28%
8.12.8	12,255	4.06%
8.13.4	11,707	3.87%
8.13.6.20060614	8,950	2.96%
8.10.2	8,643	2.86%
8.9.3	7,872	2.61%
8.13.7	7,564	2.50%
8.13.8	4,539	1.50%
8.13.3	3,592	1.19%
8.12.9	3,277	1.08%
Other	14,153	4.68%
Microsoft (185,319 servers)
Version	Number of Servers	Percent
6.0.3790.1830	109,137	58.89%
5.0.2195.6713	41,602	22.45%
6.0.3790.211	21,650	11.68%
5.5.2653.13	3,670	1.98%
6.0.3790.0	3,455	1.86%
Other	5,805	3.13%
Exim (155,322 servers)
Version	Number of Servers	Percent
4.52	113,426	73.03%
4.50	10,333	6.65%
4.60	6,474	4.17%
4.62	4,396	2.83%
4.44	3,201	2.06%
4.63	2,819	1.81%
3.36	2,040	1.31%
4.43	1,760	1.13%
Other	10,873	7.00%
Postfix (112,574 servers)
Version	Number of Servers	Percent
Other	112,574	100.00%
IMail (47,881 servers)
Version	Number of Servers	Percent
8.15	13,505	28.21%
6.06	5,756	12.02%
8.22	5,398	11.27%
8.05	5,371	11.22%
8.21	2,266	4.73%
9.04	2,111	4.41%
7.15	2,021	4.22%
7.07	1,801	3.76%
8.20	1,020	2.13%
8.10	735	1.54%
8.00	717	1.50%
8.14	706	1.47%
9.10	644	1.35%
8.12	540	1.13%
8.02	495	1.03%
8.13	490	1.02%
Other	4,305	8.99%
MDaemon (20,870 servers)
Version	Number of Servers	Percent
9.0.6	2,946	14.12%
8.1.3	2,201	10.55%
9.0.4	1,386	6.64%
6.8.5	1,249	5.98%
8.1.4	1,069	5.12%
9.0.1	1,052	5.04%
9.0.5	1,047	5.02%
7.2.3	1,016	4.87%
7.2.0	915	4.38%
9.0.0	766	3.67%
8.0.2	690	3.31%
8.1.5	566	2.71%
8.1.1	552	2.64%
8.0.3	551	2.64%
7.1.2	467	2.24%
7.1.0	464	2.22%
7.2.2	433	2.07%
6.8.4	410	1.96%
8.0.1	363	1.74%
7.2.1	362	1.73%
7.0.1	333	1.60%
Other	2,032	9.74%
MailEnable (17,790 servers)
Version	Number of Servers	Percent
1.8--	2,964	16.66%
1.9--	2,365	13.29%
1.95--	1,583	8.90%
1.96--	1,166	6.55%
0-1.75-	960	5.40%
0-1.54-	779	4.38%
0-1.6-	720	4.05%
0-1.79-	511	2.87%
0-2.11-	485	2.73%
1.73--	459	2.58%
0-1.71-	381	2.14%
0-1.72-	330	1.85%
1.91--	328	1.84%
1.71--	298	1.68%
0-2.2-	260	1.46%
1.92--	254	1.43%
0--2.11	234	1.32%
Other	3,713	20.87%
Lotus Domino (8,986 servers)
Version	Number of Servers	Percent
6.5.4	943	10.49%
6.5.1	908	10.10%
7.0.1	795	8.85%
6.5.3	674	7.50%
7.0	550	6.12%
6.5.5	506	5.63%
6.5	468	5.21%
5.0.11	422	4.70%
6.5.2	411	4.57%
5.0.12	281	3.13%
6.5.4FP2	233	2.59%
5.0.8	232	2.58%
7.0.1FP1	222	2.47%
5.0.10	216	2.40%
5.0.13a	178	1.98%
6.0.2CF1	173	1.93%
6.5.4FP1	169	1.88%
6.0.3	158	1.76%
6.0	142	1.58%
6.5.5FP1	124	1.38%
5.0.9	120	1.34%
5.0.5	100	1.11%
6.5.3FP1	100	1.11%
6.5.4FP3	94	1.05%
Other	767	8.54%
Merak (8,513 servers)
Version	Number of Servers	Percent
8.5.0	1,873	22.00%
8.0.3	1,846	21.68%
8.3.8	906	10.64%
7.4.5	478	5.61%
7.6.4	378	4.44%
7.5.2	352	4.13%
8.2.4	279	3.28%
7.4.2	237	2.78%
7.2.0	203	2.38%
6.2.1	151	1.77%
8.3.0	146	1.72%
7.4.0	120	1.41%
4.4.2	115	1.35%
7.6.1	101	1.19%
5.5.7	90	1.06%
Other	1,238	14.54%
CommuniGate Pro (5,634 servers)
Version	Number of Servers	Percent
4.1.8	928	16.47%
5.0.9	681	12.09%
4.2.10	559	9.92%
5.0.8	244	4.33%
4.2.4	239	4.24%
4.2.8	192	3.41%
4.2	171	3.04%
4.3.8	164	2.91%
4.2.9	152	2.70%
4.2.7	141	2.50%
4.0.6	139	2.47%
5.1	125	2.22%
5.0.10	124	2.20%
4.3.6	123	2.18%
5.0.6	115	2.04%
3.5.9	105	1.86%
4.0.1	97	1.72%
4.3.4	73	1.30%
4.2.5	71	1.26%
4.2.3	69	1.22%
4.3.9	68	1.21%
5.0.1	68	1.21%
4.2.6	62	1.10%
5.0.7	60	1.06%
4.3.7	60	1.06%
4.0.5	58	1.03%
Other	746	13.24%
GroupWise (4,826 servers)
Version	Number of Servers	Percent
7.0.1	853	17.68%
6.5.4	835	17.30%
7.0	434	8.99%
6.5.5	412	8.54%
6.0.4	402	8.33%
6.5.6	322	6.67%
6.5.1	305	6.32%
6.5.2	198	4.10%
6.5.3	190	3.94%
6.0.2	141	2.92%
6.5.7	132	2.74%
6.0.3	121	2.51%
6.5.0	115	2.38%
5.5.5	114	2.36%
6.0.1	92	1.91%
Other	160	3.32%
Trend Micro (4,789 servers)
Version	Number of Servers	Percent
5.5	3,113	65.00%
5.7	1,117	23.32%
5.18	481	10.04%
5.15	56	1.17%
Other	22	0.46%
WinWebMail (3,923 servers)
Version	Number of Servers	Percent
3.7.1.1	1,124	28.65%
3.6.3.1	1,074	27.38%
3.7.0.5	661	16.85%
3.7.0.7	580	14.78%
3.7.0.3	426	10.86%
Other	58	1.48%
Kerio (3,752 servers)
Version	Number of Servers	Percent
6.2.0	697	18.58%
6.1.4	437	11.65%
6.1.3	375	9.99%
6.2.1	341	9.09%
6.1.2	330	8.80%
6.1.0	252	6.72%
6.0.10	183	4.88%
6.1.1	157	4.18%
6.0.3	116	3.09%
5.7.10	83	2.21%
6.0.6	83	2.21%
6.0.8	80	2.13%
6.0.9	71	1.89%
6.0.7	59	1.57%
5.7.9	42	1.12%
Other	446	11.89%
ArGoSoft (3,224 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	1,089	33.78%
1.8 (1.8.8.8)	349	10.83%
1.8 (1.8.8.1)	158	4.90%
1.8 (1.8.6.0)	131	4.06%
1.8 (1.8.8.5)	114	3.54%
1.8 (1.8.8.2)	112	3.47%
1.8 (1.8.8.3)	110	3.41%
1.8 (1.8.8.4)	96	2.98%
1.8 (1.8.7.5)	73	2.26%
1.8 (1.8.8.6)	72	2.23%
1.8 (1.8.5.9)	65	2.02%
1.8 (1.8.6.6)	49	1.52%
1.8 (1.8.7.6)	47	1.46%
1.8 (1.8.7.3)	42	1.30%
1.8 (1.8.7.7)	37	1.15%
Other	680	21.09%
XMail (2,346 servers)
Version	Number of Servers	Percent
1.22	940	40.07%
1.21	559	23.83%
1.20	256	10.91%
1.17	225	9.59%
1.18	81	3.45%
1.12	73	3.11%
1.16	48	2.05%
1.10	37	1.58%
1.11	28	1.19%
1.15	26	1.11%
Other	73	3.11%
NetIQ MailMarshal (1,878 servers)
Version	Number of Servers	Percent
6.0.3.8	1,315	70.02%
5.5.6.7	179	9.53%
6.1.3.15	95	5.06%
5.5.4.16	59	3.14%
5.5.5.9	52	2.77%
5.5.6.6	41	2.18%
5.5.6.5	34	1.81%
5.5.5.6	27	1.44%
5.5.4.17	20	1.06%
Other	56	2.98%
Gordano Messaging Suite (GMS) (1,821 servers)
Version	Number of Servers	Percent
Other	1,821	100.00%
SurgeSMTP (1,624 servers)
Version	Number of Servers	Percent
3.7b8-8	510	31.40%
3.6f5-5	220	13.55%
3.7b6-6	146	8.99%
3.5b3-3	123	7.57%
3.8b-1	116	7.14%
3.0c2-2	103	6.34%
3.8a-8	41	2.52%
2.1c7-7	35	2.16%
1.6e2	24	1.48%
1.8g3	23	1.42%
3.6f3-3	23	1.42%
2.0g2-1	22	1.35%
2.2c10-10	21	1.29%
Other	217	13.36%
Interscan (1,567 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	371	23.68%
3.81-Build_1022	200	12.76%
3.53 (build 2011)	153	9.76%
3.55 (build 1029)	136	8.68%
3.8-Build_3013	126	8.04%
3.53 (build 2017)	117	7.47%
3.53 (build 2013)	81	5.17%
3.52 (build 1375)	55	3.51%
3.55 (build 1020)	53	3.38%
3.53 (build 1493)	43	2.74%
3.8-Build_1080	32	2.04%
3.55 (build 1018)	17	1.08%
3.81-Build_1032	17	1.08%
3.81-Build_1084	16	1.02%
3.81-Build_1055	16	1.02%
3.8-Build_3065	16	1.02%
Other	118	7.53%
Post.Office (1,437 servers)
Version	Number of Servers	Percent
3.5.3	538	37.44%
3.5.3J	150	10.44%
3.8.3	77	5.36%
3.6.3	72	5.01%
3.6.2	59	4.11%
3.1.2J	51	3.55%
3.9.1	43	2.99%
3.1.2	41	2.85%
3.8.4	37	2.57%
3.5.2	35	2.44%
3.9.0	30	2.09%
3.9.2	29	2.02%
3.6.0	26	1.81%
4.0.1	26	1.81%
4.0.0.2	24	1.67%
3.6	16	1.11%
3.8.7.4	15	1.04%
3.9.1.3	15	1.04%
4.0.0.1	15	1.04%
3.5.1	15	1.04%
Other	123	8.56%
InterScan VirusWall (1,357 servers)
Version	Number of Servers	Percent
Other	1,357	100.00%
ModusMail (1,257 servers)
Version	Number of Servers	Percent
4.35.480.0	779	61.97%
4.35.477.0	79	6.28%
4.1.361.21	59	4.69%
4.3.459.0	50	3.98%
4.35.480.11	47	3.74%
4.2.425.16	35	2.78%
3.2.315.0	30	2.39%
4.2.425.22	26	2.07%
3.1.302.0	25	1.99%
4.2.407.0	25	1.99%
4.1.361.0	19	1.51%
3.1.297.0	17	1.35%
Other	66	5.25%
Qmail Toaster (984 servers)
Version	Number of Servers	Percent
1.2	623	63.31%
1.3	204	20.73%
1.0	156	15.85%
Other	1	0.10%
VisNetic (756 servers)
Version	Number of Servers	Percent
7.2.4.1	82	10.85%
8.0.3.0	64	8.47%
8.3.5.0	61	8.07%
8.5.0.5	59	7.80%
7.6.1.0	47	6.22%
5.8.6.6	46	6.08%
8.3.6	45	5.95%
5.0.2.3	45	5.95%
6.2.2.0	42	5.56%
8.0.3.1	39	5.16%
5.5.8.3	31	4.10%
8.5.0.8	29	3.84%
7.5.3.0	22	2.91%
8.0.3	20	2.65%
5.4.5.4	17	2.25%
5.3.5.0	15	1.98%
5.8.6.4	15	1.98%
8.3.0.1	14	1.85%
6.0.9.0	10	1.32%
7.2.4.0	9	1.19%
Other	44	5.82%
MAILsweeper (475 servers)
Version	Number of Servers	Percent
4.3.12.0	84	17.68%
4.3.17.0	81	17.05%
4.3.19.0	80	16.84%
4.3.14.0	77	16.21%
4.3.20.0	37	7.79%
4.2.10.0	25	5.26%
4.3.1.0	24	5.05%
4.2.5.0	17	3.58%
4.3.10.0	16	3.37%
4.3.6.0	15	3.16%
4.2.1.0	14	2.95%
Other	5	1.05%
Mirapoint (474 servers)
Version	Number of Servers	Percent
3.7.3a-GA	67	14.14%
3.7.5a-GA	65	13.71%
3.7.4b-GA	46	9.70%
3.7.5-GA	44	9.28%
3.8.1-FCS	29	6.12%
3.7.2-GA	27	5.70%
3.5.8-GR	26	5.49%
3.7.1-GA	25	5.27%
3.8.0-FCS	23	4.85%
3.7.0-GA	13	2.74%
3.7.3-GA	12	2.53%
3.6.5-GR	12	2.53%
1.1.0	10	2.11%
3.6.6-GR	9	1.90%
3.6.4-CR	8	1.69%
3.5.9-GR	7	1.48%
3.5.7-GR	5	1.05%
3.4.5-GR	5	1.05%
Other	41	8.65%
Mercury (409 servers)
Version	Number of Servers	Percent
1.48	184	44.99%
3.32	135	33.01%
3.21c	32	7.82%
3.31	20	4.89%
1.44	16	3.91%
1.47	8	1.96%
3.01a	6	1.47%
Other	8	1.96%
WebSTAR V (369 servers)
Version	Number of Servers	Percent
5.4.0	106	28.73%
5.4.1	105	28.46%
5.3.4	82	22.22%
5.3.3	35	9.49%
5.3.2	24	6.50%
5.3.0	9	2.44%
5.3.1	6	1.63%
Other	2	0.54%
WebSTAR (180 servers)
Version	Number of Servers	Percent
Other	180	100.00%
MessageWall (176 servers)
Version	Number of Servers	Percent
1.0.8	141	80.11%
1.0.11	15	8.52%
1.1.23	7	3.98%
1.1.0	5	2.84%
1.0.6	3	1.70%
Other	5	2.84%
Neon Mail Server (151 servers)
Version	Number of Servers	Percent
3.0.7	75	49.67%
3.0.9	51	33.77%
3.0.8	11	7.28%
3.0.6	9	5.96%
3.0.4	2	1.32%
3.0.5	2	1.32%
Other	1	0.66%
MagicMail (118 servers)
Version	Number of Servers	Percent
Other	118	100.00%
OpenVMS (35 servers)
Version	Number of Servers	Percent
7.3	14	40.00%
8.2	10	28.57%
7.2	7	20.00%
6.1	2	5.71%
7.1	2	5.71%
Other	0	0.00%