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	1,568,011	100.0%
Number of Servers that didn't respond	206,993	13.20%
Server didn't open socket	200,218	12.77%
Server didn't provide banner	6,775	0.43%
Server provided banner	1,361,018	86.80%
Server banner identifies software in use	876,006	55.87%

As indicated by the above table, of the 1,568,011 servers queried, only 876,006 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	316,270	36.10%
Microsoft	173,030	19.75%
Exim	135,503	15.47%
Postfix	100,660	11.49%
IMail	53,023	6.05%
MDaemon	20,127	2.30%
MailEnable	14,938	1.71%
Lotus Domino	9,484	1.08%
Merak	8,353	0.95%
CommuniGate Pro	5,786	0.66%
GroupWise	5,412	0.62%
Trend Micro	4,657	0.53%
ArGoSoft	3,270	0.37%
Kerio	3,265	0.37%
WinWebMail	3,152	0.36%
NetIQ MailMarshal	2,539	0.29%
XMail	2,173	0.25%
Gordano Messaging Suite (GMS)	2,137	0.24%
Interscan	2,066	0.24%
Post.Office	1,651	0.19%
SurgeSMTP	1,478	0.17%
ModusMail	1,395	0.16%
InterScan VirusWall	1,319	0.15%
VisNetic	813	0.09%
MAILsweeper	727	0.08%
Qmail Toaster	716	0.08%
Mercury	515	0.06%
WebSTAR V	462	0.05%
Mirapoint	404	0.05%
WebSTAR	238	0.03%
MessageWall	224	0.03%
Neon Mail Server	133	0.02%
MagicMail	48	0.01%
OpenVMS	38	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (316,270 servers)
Version	Number of Servers	Percent
8.12.10	89,659	28.35%
8.11.6	62,243	19.68%
8.12.11	37,353	11.81%
8.13.4	27,194	8.60%
8.13.1	25,808	8.16%
8.12.8	16,465	5.21%
8.9.3	11,708	3.70%
8.10.2	11,652	3.68%
8.13.5	5,076	1.60%
8.13.3	4,989	1.58%
8.11.7	4,805	1.52%
8.12.9	4,538	1.43%
Other	14,780	4.67%
Microsoft (173,030 servers)
Version	Number of Servers	Percent
6.0.3790.1830	77,837	44.98%
5.0.2195.6713	49,940	28.86%
6.0.3790.211	27,389	15.83%
5.5.2653.13	5,307	3.07%
6.0.3790.0	4,929	2.85%
5.0.2195.5329	2,030	1.17%
Other	5,598	3.24%
Exim (135,503 servers)
Version	Number of Servers	Percent
4.52	96,556	71.26%
4.50	10,144	7.49%
4.60	6,104	4.50%
4.44	4,078	3.01%
4.43	3,239	2.39%
3.36	2,266	1.67%
3.35	2,089	1.54%
4.54	1,818	1.34%
4.42	1,806	1.33%
4.34	1,504	1.11%
Other	5,899	4.35%
Postfix (100,660 servers)
Version	Number of Servers	Percent
Other	100,660	100.00%
IMail (53,023 servers)
Version	Number of Servers	Percent
8.15	15,581	29.39%
8.05	6,700	12.64%
6.06	6,628	12.50%
8.21	4,131	7.79%
8.22	3,728	7.03%
7.07	2,505	4.72%
7.15	2,211	4.17%
8.20	1,436	2.71%
9.02	895	1.69%
8.10	890	1.68%
8.00	826	1.56%
8.14	791	1.49%
8.13	681	1.28%
8.12	628	1.18%
8.02	619	1.17%
Other	4,773	9.00%
MDaemon (20,127 servers)
Version	Number of Servers	Percent
8.1.3	3,908	19.42%
8.1.4	3,656	18.16%
6.8.5	1,513	7.52%
7.2.3	1,317	6.54%
7.2.0	1,146	5.69%
8.0.2	861	4.28%
8.1.1	794	3.94%
8.0.3	590	2.93%
7.1.0	585	2.91%
7.1.2	559	2.78%
7.2.2	556	2.76%
8.0.1	545	2.71%
6.8.4	504	2.50%
7.2.1	468	2.33%
7.0.1	461	2.29%
8.1.2	307	1.53%
Other	2,357	11.71%
MailEnable (14,938 servers)
Version	Number of Servers	Percent
1.8--	3,702	24.78%
1.9--	1,578	10.56%
0-1.54-	1,307	8.75%
0-1.6-	1,132	7.58%
0-1.72-	921	6.17%
0-1.71-	704	4.71%
1.91--	631	4.22%
0--1.1	602	4.03%
1.73--	562	3.76%
1.71--	433	2.90%
0-1.7-	403	2.70%
1.92--	375	2.51%
0--1.2	271	1.81%
1.72--	218	1.46%
1.703--	157	1.05%
Other	1,942	13.00%
Lotus Domino (9,484 servers)
Version	Number of Servers	Percent
6.5.4	1,145	12.07%
6.5.1	1,111	11.71%
6.5.3	825	8.70%
6.5	611	6.44%
5.0.11	549	5.79%
7.0	541	5.70%
6.5.2	505	5.32%
5.0.12	385	4.06%
6.5.4FP2	314	3.31%
5.0.8	302	3.18%
6.5.5	272	2.87%
5.0.10	271	2.86%
6.5.4FP1	240	2.53%
5.0.13a	228	2.40%
6.0.2CF1	225	2.37%
6.0.3	218	2.30%
6.0	165	1.74%
7.0.1	157	1.66%
5.0.9	156	1.64%
6.5.3FP1	133	1.40%
5.0.5	121	1.28%
6.0.1	116	1.22%
5.0.6a	110	1.16%
5.0.9a	99	1.04%
Other	685	7.22%
Merak (8,353 servers)
Version	Number of Servers	Percent
8.0.3	1,776	21.26%
8.3.8	1,561	18.69%
7.4.5	560	6.70%
8.2.4	491	5.88%
7.6.4	410	4.91%
7.5.2	391	4.68%
7.4.2	291	3.48%
8.3.0	281	3.36%
7.2.0	231	2.77%
8.3.6	217	2.60%
7.4.0	188	2.25%
6.2.1	177	2.12%
4.4.2	141	1.69%
5.5.7	108	1.29%
7.0.1	103	1.23%
7.6.1	101	1.21%
5.8.6	98	1.17%
5.9.4	96	1.15%
6.1.0	84	1.01%
Other	1,048	12.55%
CommuniGate Pro (5,786 servers)
Version	Number of Servers	Percent
4.1.8	1,040	17.97%
4.2.10	593	10.25%
5.0.8	322	5.57%
4.2.4	267	4.61%
4.2.8	249	4.30%
4.2	230	3.98%
4.3.8	227	3.92%
4.2.9	204	3.53%
4.2.7	197	3.40%
4.3.6	170	2.94%
5.0.6	168	2.90%
4.0.6	162	2.80%
3.5.9	120	2.07%
4.3.7	112	1.94%
4.0.1	99	1.71%
5.0.1	94	1.62%
5.0.7	91	1.57%
4.3.4	89	1.54%
4.3.9	89	1.54%
5.0.2	85	1.47%
4.2.5	84	1.45%
4.2.6	83	1.43%
4.2.3	73	1.26%
5.0.4	70	1.21%
4.1.6	69	1.19%
4.1.3	67	1.16%
4.0.5	65	1.12%
5.0	63	1.09%
5.0.3	62	1.07%
Other	542	9.37%
GroupWise (5,412 servers)
Version	Number of Servers	Percent
6.5.4	1,319	24.37%
7.0	696	12.86%
6.5.5	581	10.74%
6.0.4	535	9.89%
6.5.1	471	8.70%
6.5.2	300	5.54%
6.5.3	291	5.38%
6.0.2	213	3.94%
6.0.3	194	3.58%
5.5.5	177	3.27%
6.5.0	173	3.20%
6.0.1	119	2.20%
6.5.6	71	1.31%
5.5.4	66	1.22%
Other	206	3.81%
Trend Micro (4,657 servers)
Version	Number of Servers	Percent
5.5	3,728	80.05%
5.18	416	8.93%
5.7	410	8.80%
5.15	72	1.55%
Other	31	0.67%
ArGoSoft (3,270 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.5)	348	10.64%
1.8 (1.8.8.1)	315	9.63%
1.8 (1.8.8.6)	303	9.27%
1.8 (1.8.8.3)	276	8.44%
1.8 (1.8.8.4)	251	7.68%
1.8 (1.8.8.2)	200	6.12%
1.8 (1.8.6.0)	184	5.63%
1.8 (1.8.7.5)	120	3.67%
1.8 (1.8.7.6)	86	2.63%
1.8 (1.8.5.9)	83	2.54%
1.8 (1.8.7.3)	67	2.05%
1.8 (1.8.6.6)	61	1.87%
1.8 (1.8.7.7)	61	1.87%
1.8 (1.8.8.0)	48	1.47%
1.8 (1.8.4.7)	45	1.38%
1.8 (1.8.3.6)	44	1.35%
1.8 (1.8.7.1)	37	1.13%
1.8 (1.8.6.3)	34	1.04%
Other	707	21.62%
Kerio (3,265 servers)
Version	Number of Servers	Percent
6.1.2	925	28.33%
6.1.0	418	12.80%
6.1.1	322	9.86%
6.0.10	242	7.41%
6.1.3	162	4.96%
6.0.3	143	4.38%
6.0.8	125	3.83%
5.7.10	105	3.22%
6.0.6	94	2.88%
6.0.9	91	2.79%
6.0.7	76	2.33%
5.7.4	52	1.59%
5.7.9	51	1.56%
6.0.1	45	1.38%
6.0.4	43	1.32%
6.0.5	42	1.29%
6.0.0	39	1.19%
5.7.2	36	1.10%
Other	254	7.78%
WinWebMail (3,152 servers)
Version	Number of Servers	Percent
3.6.3.1	1,548	49.11%
3.7.0.5	851	27.00%
3.7.0.3	528	16.75%
3.7.0.7	136	4.31%
3.7.0.1	74	2.35%
Other	15	0.48%
NetIQ MailMarshal (2,539 servers)
Version	Number of Servers	Percent
6.0.3.8	1,750	68.92%
5.5.6.7	231	9.10%
6.1.3.15	127	5.00%
5.5.5.9	76	2.99%
5.5.4.16	75	2.95%
5.5.6.6	60	2.36%
5.5.6.5	54	2.13%
5.5.5.6	50	1.97%
5.5.4.17	34	1.34%
Other	82	3.23%
XMail (2,173 servers)
Version	Number of Servers	Percent
1.21	640	29.45%
1.22	511	23.52%
1.20	359	16.52%
1.17	247	11.37%
1.18	94	4.33%
1.12	68	3.13%
1.16	51	2.35%
1.10	50	2.30%
1.15	39	1.79%
1.11	36	1.66%
Other	78	3.59%
Gordano Messaging Suite (GMS) (2,137 servers)
Version	Number of Servers	Percent
Other	2,137	100.00%
Interscan (2,066 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	527	25.51%
3.81-Build_1022	221	10.70%
3.53 (build 2011)	211	10.21%
3.8-Build_3013	159	7.70%
3.53 (build 2017)	158	7.65%
3.55 (build 1029)	155	7.50%
3.53 (build 2013)	114	5.52%
3.52 (build 1375)	89	4.31%
3.55 (build 1020)	58	2.81%
3.53 (build 1493)	56	2.71%
3.8-Build_1080	44	2.13%
3.55 (build 1018)	27	1.31%
3.8-Build_3065	24	1.16%
3.81-Build_1032	23	1.11%
3.81-Build_1021	21	1.02%
Other	179	8.66%
Post.Office (1,651 servers)
Version	Number of Servers	Percent
3.5.3	684	41.43%
3.5.3J	179	10.84%
3.8.3	80	4.85%
3.6.2	73	4.42%
3.1.2	69	4.18%
3.1.2J	69	4.18%
3.6.3	63	3.82%
3.5.2	48	2.91%
3.9.1	45	2.73%
3.8.4	41	2.48%
3.6.0	32	1.94%
3.9.0	32	1.94%
3.6	29	1.76%
3.9.2	28	1.70%
Other	179	10.84%
SurgeSMTP (1,478 servers)
Version	Number of Servers	Percent
3.6f5-5	635	42.96%
3.0c2-2	171	11.57%
3.5b3-3	146	9.88%
2.1c7-7	53	3.59%
3.7a-15	29	1.96%
2.0g2-1	28	1.89%
1.6e2	28	1.89%
2.2c10-10	27	1.83%
3.7c-2	25	1.69%
1.8g3	24	1.62%
3.6f4-4	22	1.49%
3.7b-1	21	1.42%
3.6f3-3	21	1.42%
1.9b-1	17	1.15%
3.6f7-7	17	1.15%
2.2g3-1	15	1.01%
3.7a-22	15	1.01%
Other	184	12.45%
ModusMail (1,395 servers)
Version	Number of Servers	Percent
4.3.459.0	357	25.59%
4.1.361.21	217	15.56%
4.2.425.22	181	12.97%
4.2.425.16	171	12.26%
4.2.425.4	123	8.82%
3.2.315.0	65	4.66%
4.2.407.0	43	3.08%
4.1.361.0	33	2.37%
4.2.420.0	31	2.22%
4.0.340.0	28	2.01%
3.1.302.0	27	1.94%
4.2.425.9	23	1.65%
3.1.297.0	17	1.22%
Other	79	5.66%
InterScan VirusWall (1,319 servers)
Version	Number of Servers	Percent
Other	1,319	100.00%
VisNetic (813 servers)
Version	Number of Servers	Percent
8.0.3.0	87	10.70%
8.3.5.0	85	10.46%
7.2.4.1	82	10.09%
5.8.6.6	61	7.50%
7.6.1.0	58	7.13%
5.0.2.3	57	7.01%
8.0.3.1	57	7.01%
6.2.2.0	50	6.15%
5.5.8.3	31	3.81%
8.0.3	27	3.32%
5.4.5.4	25	3.08%
7.5.3.0	24	2.95%
8.3.0.1	22	2.71%
8.3.6	21	2.58%
5.8.6.4	20	2.46%
5.3.5.0	15	1.85%
5.0.1	14	1.72%
6.0.9.0	14	1.72%
5.0.2.1	11	1.35%
7.2.4.0	10	1.23%
Other	42	5.17%
MAILsweeper (727 servers)
Version	Number of Servers	Percent
4.3.12.0	142	19.53%
4.3.14.0	129	17.74%
4.3.19.0	129	17.74%
4.3.17.0	125	17.19%
4.2.10.0	49	6.74%
4.3.1.0	40	5.50%
4.3.10.0	30	4.13%
4.2.5.0	28	3.85%
4.3.6.0	23	3.16%
4.2.1.0	18	2.48%
Other	14	1.93%
Qmail Toaster (716 servers)
Version	Number of Servers	Percent
1.2	526	73.46%
1.0	188	26.26%
Other	2	0.28%
Mercury (515 servers)
Version	Number of Servers	Percent
1.48	224	43.50%
3.32	184	35.73%
3.21c	36	6.99%
3.31	23	4.47%
1.44	16	3.11%
1.47	13	2.52%
3.01a	7	1.36%
Other	12	2.33%
WebSTAR V (462 servers)
Version	Number of Servers	Percent
5.4.0	152	32.90%
5.4.1	109	23.59%
5.3.4	104	22.51%
5.3.3	43	9.31%
5.3.2	31	6.71%
5.3.0	9	1.95%
5.2.4	8	1.73%
5.3.1	6	1.30%
Other	0	0.00%
Mirapoint (404 servers)
Version	Number of Servers	Percent
3.7.2-GA	49	12.13%
3.5.8-GR	47	11.63%
3.7.1-GA	42	10.40%
3.7.3a-GA	41	10.15%
3.5.9-GR	33	8.17%
3.7.0-GA	22	5.45%
3.7.3-GA	21	5.20%
3.6.5-GR	18	4.46%
3.6.4-CR	14	3.47%
3.7.4b-GA	14	3.47%
3.6.6-GR	13	3.22%
1.1.0	11	2.72%
3.5.7-GR	9	2.23%
3.3.3-GR	8	1.98%
3.7.4a-GA	7	1.73%
3.5.3-GR	6	1.49%
3.4.6-GR	6	1.49%
3.5.6-GR	5	1.24%
3.2.2-GA	5	1.24%
Other	33	8.17%
WebSTAR (238 servers)
Version	Number of Servers	Percent
Other	238	100.00%
MessageWall (224 servers)
Version	Number of Servers	Percent
1.0.8	190	84.82%
1.0.9	14	6.25%
1.1.23	7	3.12%
1.1.0	6	2.68%
1.0.6	4	1.79%
Other	3	1.34%
Neon Mail Server (133 servers)
Version	Number of Servers	Percent
3.0.7	94	70.68%
3.0.8	20	15.04%
3.0.6	11	8.27%
3.0.4	4	3.01%
3.0.5	4	3.01%
Other	0	0.00%
MagicMail (48 servers)
Version	Number of Servers	Percent
Other	48	100.00%
OpenVMS (38 servers)
Version	Number of Servers	Percent
7.3	22	57.89%
7.2	8	21.05%
8.2	4	10.53%
6.1	2	5.26%
7.1	2	5.26%
Other	0	0.00%