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	1,861,186	100.0%
Number of Servers that didn't respond	298,366	16.03%
Server didn't open socket	286,490	15.39%
Server didn't provide banner	11,876	0.64%
Server provided banner	1,562,820	83.97%
Server banner identifies software in use	886,239	47.62%

As indicated by the above table, of the 1,861,186 servers queried, only 886,239 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	246,885	27.86%
Sendmail	186,390	21.03%
Microsoft	183,637	20.72%
Postfix	164,847	18.60%
MailEnable	26,291	2.97%
MDaemon	21,653	2.44%
IMail	16,318	1.84%
Kerio	6,393	0.72%
Lotus Domino	5,528	0.62%
WinWebMail	4,785	0.54%
CommuniGate Pro	4,100	0.46%
Merak	3,950	0.45%
XMail	2,544	0.29%
GroupWise	1,909	0.22%
ArGoSoft	1,894	0.21%
Qmail Toaster	1,749	0.20%
Trend Micro	1,592	0.18%
SurgeSMTP	1,528	0.17%
Gordano Messaging Suite (GMS)	729	0.08%
Post.Office	655	0.07%
Mirapoint	489	0.06%
InterScan VirusWall	420	0.05%
VisNetic	417	0.05%
MagicMail	357	0.04%
NetIQ MailMarshal	293	0.03%
Interscan	247	0.03%
Neon Mail Server	153	0.02%
WebSTAR V	128	0.01%
Mercury	120	0.01%
ModusMail	66	0.01%
MessageWall	57	0.01%
WebSTAR	46	0.01%
MAILsweeper	46	0.01%
OpenVMS	23	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (246,885 servers)
Version	Number of Servers	Percent
4.69	194,719	78.87%
4.63	16,750	6.78%
4.67	11,756	4.76%
4.68	4,859	1.97%
4.66	4,193	1.70%
4.60	3,657	1.48%
4.50	2,845	1.15%
4.62	2,721	1.10%
Other	5,385	2.18%
Sendmail (186,390 servers)
Version	Number of Servers	Percent
8.13.1	33,669	18.06%
8.13.8	20,043	10.75%
8.12.11.20060614	18,162	9.74%
8.12.11.20060308	16,219	8.70%
8.13.6	14,237	7.64%
8.14.3	13,277	7.12%
8.13.6.20060614	10,440	5.60%
8.12.10	8,335	4.47%
8.11.6	8,087	4.34%
8.12.11	8,022	4.30%
8.14.1	6,775	3.63%
8.14.2	6,314	3.39%
8.13.4	4,467	2.40%
8.13.7	4,122	2.21%
8.12.8	3,531	1.89%
8.9.3	2,063	1.11%
Other	8,627	4.63%
Microsoft (183,637 servers)
Version	Number of Servers	Percent
6.0.3790.3959	149,282	81.29%
6.0.3790.1830	19,857	10.81%
5.0.2195.6713	9,638	5.25%
6.0.3790.211	2,276	1.24%
Other	2,584	1.41%
Postfix (164,847 servers)
Version	Number of Servers	Percent
Other	164,847	100.00%
MailEnable (26,291 servers)
Version	Number of Servers	Percent
1.986--	5,757	21.90%
1.981--	4,521	17.20%
1.983--	2,878	10.95%
1.96--	948	3.61%
1.95--	942	3.58%
3.62--	815	3.10%
0-3.6-	776	2.95%
0-3.61-	744	2.83%
1.9--	741	2.82%
1.8--	543	2.07%
--3.61	513	1.95%
0-2.37-	475	1.81%
0-3.14-	468	1.78%
--3.6	367	1.40%
0-1.87-	362	1.38%
0-1.85-	357	1.36%
0-2.53-	329	1.25%
0-3.53-	322	1.22%
Other	4,433	16.86%
MDaemon (21,653 servers)
Version	Number of Servers	Percent
10.0.5	3,743	17.29%
10.0.4	2,154	9.95%
9.6.1	1,210	5.59%
9.6.6	1,207	5.57%
10.0.0	1,169	5.40%
9.6.5	938	4.33%
10.0.2	804	3.71%
9.5.2	748	3.45%
9.6.4	654	3.02%
8.1.3	646	2.98%
9.6.2	642	2.96%
9.5.6	608	2.81%
9.0.4	550	2.54%
9.5.1	548	2.53%
10.0.1	401	1.85%
10.0.3	393	1.81%
9.6.3	374	1.73%
7.2.3	344	1.59%
6.8.5	339	1.57%
7.2.0	302	1.39%
9.0.1	292	1.35%
9.5.5	254	1.17%
9.0.0	223	1.03%
8.1.4	222	1.03%
Other	2,888	13.34%
IMail (16,318 servers)
Version	Number of Servers	Percent
8.22	3,226	19.77%
10.02	1,837	11.26%
8.15	1,690	10.36%
9.23	1,273	7.80%
8.05	868	5.32%
9.10	703	4.31%
7.07	593	3.63%
9.20	581	3.56%
10.01	554	3.40%
9.21	496	3.04%
7.15	444	2.72%
6.06	394	2.41%
11.0	382	2.34%
8.00	378	2.32%
9.22	373	2.29%
8.04	303	1.86%
8.21	285	1.75%
10.0	278	1.70%
8.01	199	1.22%
8.10	199	1.22%
8.20	165	1.01%
Other	1,097	6.72%
Kerio (6,393 servers)
Version	Number of Servers	Percent
6.6.2	2,475	38.71%
6.5.2	588	9.20%
6.5.0	444	6.95%
6.6.0	409	6.40%
6.4.1	333	5.21%
6.6.1	324	5.07%
6.3.1	285	4.46%
6.5.1	280	4.38%
6.4.0	221	3.46%
6.4.2	189	2.96%
6.3.0	128	2.00%
Other	717	11.22%
Lotus Domino (5,528 servers)
Version	Number of Servers	Percent
8.5	546	9.88%
7.0.2	503	9.10%
8.0.2	396	7.16%
8.0.1	358	6.48%
7.0.3	344	6.22%
7.0.1	270	4.88%
6.5.4	255	4.61%
6.5.1	223	4.03%
7.0.3FP1	209	3.78%
7.0.2FP2	203	3.67%
6.5.3	195	3.53%
6.5.5	171	3.09%
7.0	169	3.06%
8.0	159	2.88%
6.5	149	2.70%
5.0.11	85	1.54%
7.0.2FP1	84	1.52%
6.5.2	80	1.45%
8.0.2FP1	71	1.28%
7.0.2FP3	71	1.28%
6.5.6	60	1.09%
Other	927	16.77%
WinWebMail (4,785 servers)
Version	Number of Servers	Percent
3.7.6.1	1,081	22.59%
3.7.3.1	888	18.56%
3.7.7.3	806	16.84%
3.7.1.1	471	9.84%
3.7.5.1	303	6.33%
3.8.0.1	288	6.02%
3.6.3.1	235	4.91%
3.7.7.1	205	4.28%
3.7.0.5	189	3.95%
3.7.0.3	148	3.09%
3.7.0.7	129	2.70%
Other	42	0.88%
CommuniGate Pro (4,100 servers)
Version	Number of Servers	Percent
4.1.8	302	7.37%
5.2.13	275	6.71%
5.2.12	232	5.66%
5.1.13	193	4.71%
4.2.10	179	4.37%
5.1.16	172	4.20%
5.2.8	148	3.61%
5.2.10	133	3.24%
5.1.12	124	3.02%
5.2.14	112	2.73%
5.2.3	107	2.61%
5.2.11	101	2.46%
5.1.14	101	2.46%
5.0.13	89	2.17%
5.0.9	80	1.95%
5.2.6	79	1.93%
5.2.5	74	1.80%
5.0.14	74	1.80%
5.2.0	69	1.68%
5.2.9	69	1.68%
5.1.9	56	1.37%
4.2.8	52	1.27%
5.1.7	50	1.22%
5.1.10	48	1.17%
4.2	48	1.17%
5.2.7	47	1.15%
5.2.1	47	1.15%
5.1.8	45	1.10%
4.2.9	45	1.10%
5.1.11	44	1.07%
4.3.12	42	1.02%
Other	863	21.05%
Merak (3,950 servers)
Version	Number of Servers	Percent
8.0.3	1,653	41.85%
8.9.1	357	9.04%
8.5.0	253	6.41%
7.4.5	217	5.49%
7.6.4	172	4.35%
7.5.2	170	4.30%
8.3.8	164	4.15%
7.4.2	82	2.08%
9.0.0	71	1.80%
7.2.0	60	1.52%
7.6.1	53	1.34%
8.2.4	48	1.22%
6.2.1	47	1.19%
8.2.13	44	1.11%
Other	559	14.15%
XMail (2,544 servers)
Version	Number of Servers	Percent
1.25	762	29.95%
1.22	693	27.24%
1.24	447	17.57%
1.21	187	7.35%
1.20	86	3.38%
1.17	86	3.38%
1.23	84	3.30%
1.12	60	2.36%
1.16	27	1.06%
Other	112	4.40%
GroupWise (1,909 servers)
Version	Number of Servers	Percent
7.0.3	649	34.00%
7.0.2	296	15.51%
6.5.7	231	12.10%
7.0.1	143	7.49%
6.5.4	117	6.13%
8.0.0	98	5.13%
6.5.6	84	4.40%
6.0.4	65	3.40%
6.5.1	50	2.62%
6.5.5	38	1.99%
7.0	34	1.78%
Other	104	5.45%
ArGoSoft (1,894 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	374	19.75%
1.8 (1.8.9.3)	281	14.84%
1.8 (1.8.9.1)	218	11.51%
1.8 (1.8.9.6)	154	8.13%
1.8 (1.8.8.7)	140	7.39%
1.8 (1.8.8.8)	140	7.39%
1.8 (1.8.9.2)	91	4.80%
1.8 (1.8.9.4)	51	2.69%
1.8 (1.8.8.9)	46	2.43%
1.8 (1.8.8.1)	40	2.11%
1.8 (1.8.9.0)	30	1.58%
1.8 (1.8.6.0)	25	1.32%
1.8 (1.8.8.2)	24	1.27%
1.8 (1.8.5.9)	20	1.06%
Other	260	13.73%
Qmail Toaster (1,749 servers)
Version	Number of Servers	Percent
1.3	1,497	85.59%
1.2	188	10.75%
1.0	43	2.46%
Other	21	1.20%
Trend Micro (1,592 servers)
Version	Number of Servers	Percent
5.7	740	46.48%
5.5	490	30.78%
5.18	244	15.33%
7.0	89	5.59%
Other	29	1.82%
SurgeSMTP (1,528 servers)
Version	Number of Servers	Percent
3.9e-1	541	35.41%
3.9c-1	139	9.10%
3.8k4-4	129	8.44%
3.9g2-2	125	8.18%
3.7b8-8	58	3.80%
3.8f3-3	53	3.47%
3.8i3-3	48	3.14%
3.6f5-5	40	2.62%
3.5b3-3	36	2.36%
3.8f2-2	26	1.70%
3.9h-65	25	1.64%
3.0c2-2	20	1.31%
4.0q-1	18	1.18%
4.0o-1	18	1.18%
Other	252	16.49%
Gordano Messaging Suite (GMS) (729 servers)
Version	Number of Servers	Percent
Other	729	100.00%
Post.Office (655 servers)
Version	Number of Servers	Percent
3.5.3	151	23.05%
4.1.0.2	62	9.47%
4.0.1	59	9.01%
3.5.3J	43	6.56%
3.8.3	35	5.34%
3.6.3	24	3.66%
3.9.1	21	3.21%
3.6.2	20	3.05%
3.1.2J	18	2.75%
3.9.2.3	17	2.60%
3.1.2	17	2.60%
3.9.2	16	2.44%
3.8.7.4	14	2.14%
3.9.0	12	1.83%
3.5.2	11	1.68%
4.1.0.3	11	1.68%
4.0.0.2	11	1.68%
4.1	10	1.53%
3.8.4	10	1.53%
3.9.1.3	9	1.37%
4.0.0.1	8	1.22%
3.9.1.2	7	1.07%
3.6.0	7	1.07%
3.9.2.1	7	1.07%
Other	55	8.40%
Mirapoint (489 servers)
Version	Number of Servers	Percent
3.8.4-GA	88	18.00%
3.8.3-GA	63	12.88%
3.10.4-GA	37	7.57%
3.8.7a	37	7.57%
3.10.3-GA	28	5.73%
3.8.6-GA	26	5.32%
4.1.3-GA	24	4.91%
3.8.2-GA	22	4.50%
3.10.5-GA	20	4.09%
3.8.5-GA	18	3.68%
3.7.5a-GA	18	3.68%
4.1.4-GA	15	3.07%
4.0.5a	14	2.86%
3.10.2-GA	13	2.66%
3.7.3a-GA	13	2.66%
3.7.4b-GA	11	2.25%
4.1.5-GA	10	2.04%
Other	32	6.54%
InterScan VirusWall (420 servers)
Version	Number of Servers	Percent
Other	420	100.00%
VisNetic (417 servers)
Version	Number of Servers	Percent
9.3.2.0	130	31.18%
9.1.4.1	60	14.39%
5.8.6.6	20	4.80%
8.5.0.8	18	4.32%
5.0.2.3	15	3.60%
8.0.3.1	14	3.36%
5.5.8.3	14	3.36%
6.2.2.0	14	3.36%
7.2.4.1	12	2.88%
8.0.3.0	11	2.64%
9.1.4.0	11	2.64%
8.0.3	10	2.40%
8.3.5.0	9	2.16%
8.3.6	9	2.16%
5.3.5.0	8	1.92%
7.6.1.0	8	1.92%
5.4.5.4	7	1.68%
5.8.6.4	5	1.20%
Other	42	10.07%
MagicMail (357 servers)
Version	Number of Servers	Percent
Other	357	100.00%
NetIQ MailMarshal (293 servers)
Version	Number of Servers	Percent
6.0.3.8	230	78.50%
5.5.6.7	17	5.80%
6.1.3.15	17	5.80%
5.5.4.16	6	2.05%
5.5.6.6	5	1.71%
5.5.6.5	4	1.37%
5.5.5.9	3	1.02%
5.5.5.6	3	1.02%
5.5.4.17	3	1.02%
Other	5	1.71%
Interscan (247 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	49	19.84%
3.8-Build_3013	45	18.22%
3.81-Build_1022	29	11.74%
3.55 (build 1029)	22	8.91%
3.53 (build 2017)	19	7.69%
3.53 (build 2011)	12	4.86%
3.81-Build_1084	12	4.86%
3.53 (build 1493)	9	3.64%
3.53 (build 2013)	8	3.24%
3.55 (build 1020)	8	3.24%
3.52 (build 1375)	7	2.83%
3.51 (build 1337)	3	1.21%
3.8-Build_3045	3	1.21%
Other	21	8.50%
Neon Mail Server (153 servers)
Version	Number of Servers	Percent
3.1.3	39	25.49%
3.1.4	24	15.69%
3.0.9	24	15.69%
3.0.7	21	13.73%
3.1.5	14	9.15%
3.1.2	13	8.50%
3.1.0	12	7.84%
3.0.8	2	1.31%
3.0.6	2	1.31%
Other	2	1.31%
WebSTAR V (128 servers)
Version	Number of Servers	Percent
5.4.1	40	31.25%
5.4.0	33	25.78%
5.3.4	31	24.22%
5.3.2	10	7.81%
5.3.3	10	7.81%
5.3.1	2	1.56%
Other	2	1.56%
Mercury (120 servers)
Version	Number of Servers	Percent
1.48	60	50.00%
3.32	33	27.50%
3.21c	9	7.50%
1.47	5	4.17%
3.31	4	3.33%
3.21	2	1.67%
3.01a	2	1.67%
1.49	2	1.67%
Other	3	2.50%
ModusMail (66 servers)
Version	Number of Servers	Percent
3.2.315.0	16	24.24%
4.35.480.0	10	15.15%
4.35.477.0	10	15.15%
3.1.302.0	5	7.58%
4.2.420.0	5	7.58%
4.35.480.11	4	6.06%
4.3.459.0	4	6.06%
4.1.361.21	3	4.55%
4.2.425.4	2	3.03%
3.1.293.1	2	3.03%
4.2.425.22	1	1.52%
4.1.361.0	1	1.52%
4.0.340.3	1	1.52%
1.4.232.0	1	1.52%
4.35.477.8	1	1.52%
Other	0	0.00%
MessageWall (57 servers)
Version	Number of Servers	Percent
1.0.8	41	71.93%
1.0.11	13	22.81%
1.1.0	2	3.51%
1.0.6	1	1.75%
Other	0	0.00%
WebSTAR (46 servers)
Version	Number of Servers	Percent
Other	46	100.00%
MAILsweeper (46 servers)
Version	Number of Servers	Percent
4.3.20.0	14	30.43%
4.3.14.0	7	15.22%
4.3.17.0	7	15.22%
4.2.10.0	4	8.70%
4.3.1.0	4	8.70%
4.3.6.0	3	6.52%
4.3.19.0	2	4.35%
4.3.10.0	2	4.35%
4.2.1.0	1	2.17%
4.3.12.0	1	2.17%
4.2.5.0	1	2.17%
Other	0	0.00%
OpenVMS (23 servers)
Version	Number of Servers	Percent
8.3	13	56.52%
7.3	5	21.74%
8.2	2	8.70%
7.2	2	8.70%
6.1	1	4.35%
Other	0	0.00%