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	1,736,063	100.0%
Number of Servers that didn't respond	256,889	14.80%
Server didn't open socket	247,891	14.28%
Server didn't provide banner	8,998	0.52%
Server provided banner	1,479,174	85.20%
Server banner identifies software in use	908,987	52.36%

As indicated by the above table, of the 1,736,063 servers queried, only 908,987 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	271,400	29.86%
Microsoft	197,618	21.74%
Exim	178,827	19.67%
Postfix	130,656	14.37%
IMail	31,681	3.49%
MDaemon	21,878	2.41%
MailEnable	20,551	2.26%
Merak	8,651	0.95%
Lotus Domino	7,744	0.85%
CommuniGate Pro	5,140	0.57%
Kerio	4,666	0.51%
Trend Micro	4,641	0.51%
WinWebMail	4,360	0.48%
GroupWise	3,741	0.41%
ArGoSoft	3,000	0.33%
XMail	2,499	0.27%
SurgeSMTP	1,731	0.19%
Gordano Messaging Suite (GMS)	1,394	0.15%
Qmail Toaster	1,381	0.15%
Post.Office	1,145	0.13%
NetIQ MailMarshal	1,083	0.12%
InterScan VirusWall	1,082	0.12%
Interscan	900	0.10%
VisNetic	623	0.07%
Mirapoint	566	0.06%
ModusMail	509	0.06%
MagicMail	293	0.03%
Mercury	291	0.03%
WebSTAR V	282	0.03%
MAILsweeper	201	0.02%
Neon Mail Server	181	0.02%
MessageWall	122	0.01%
WebSTAR	117	0.01%
OpenVMS	33	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (271,400 servers)
Version	Number of Servers	Percent
8.12.11.20060614	45,781	16.87%
8.12.11.20060308	33,508	12.35%
8.11.6	28,267	10.42%
8.13.6	27,164	10.01%
8.13.1	25,568	9.42%
8.12.10	19,517	7.19%
8.13.8	15,795	5.82%
8.12.11	12,028	4.43%
8.13.6.20060614	10,222	3.77%
8.13.4	9,572	3.53%
8.12.8	8,544	3.15%
8.13.7	6,103	2.25%
8.10.2	5,515	2.03%
8.9.3	5,224	1.92%
Other	18,592	6.85%
Microsoft (197,618 servers)
Version	Number of Servers	Percent
6.0.3790.1830	105,231	53.25%
6.0.3790.3959	42,080	21.29%
5.0.2195.6713	28,913	14.63%
6.0.3790.211	13,738	6.95%
6.0.3790.0	2,012	1.02%
Other	5,644	2.86%
Exim (178,827 servers)
Version	Number of Servers	Percent
4.63	89,248	49.91%
4.66	43,222	24.17%
4.52	9,219	5.16%
4.50	9,152	5.12%
4.60	7,752	4.33%
4.62	3,967	2.22%
4.67	2,709	1.51%
4.44	2,649	1.48%
Other	10,909	6.10%
Postfix (130,656 servers)
Version	Number of Servers	Percent
Other	130,656	100.00%
IMail (31,681 servers)
Version	Number of Servers	Percent
8.15	6,115	19.30%
8.22	6,068	19.15%
8.05	3,821	12.06%
9.10	2,985	9.42%
9.20	2,470	7.80%
7.15	1,339	4.23%
7.07	1,261	3.98%
6.06	1,029	3.25%
8.21	814	2.57%
8.00	600	1.89%
8.20	491	1.55%
9.04	479	1.51%
8.10	385	1.22%
8.02	365	1.15%
8.12	334	1.05%
8.13	323	1.02%
8.04	323	1.02%
Other	2,479	7.82%
MDaemon (21,878 servers)
Version	Number of Servers	Percent
9.5.6	6,093	27.85%
8.1.3	1,385	6.33%
9.0.4	1,222	5.59%
6.8.5	859	3.93%
9.5.4	741	3.39%
7.2.3	736	3.36%
9.5.5	696	3.18%
9.5.2	666	3.04%
9.5.1	659	3.01%
7.2.0	652	2.98%
9.0.1	587	2.68%
8.1.4	533	2.44%
9.5.3	498	2.28%
9.0.0	482	2.20%
8.0.2	479	2.19%
8.0.3	406	1.86%
8.1.1	402	1.84%
9.0.7	350	1.60%
9.0.6	341	1.56%
7.1.2	338	1.54%
8.1.5	326	1.49%
7.1.0	304	1.39%
7.2.2	294	1.34%
7.2.1	262	1.20%
8.0.1	244	1.12%
7.0.1	235	1.07%
6.8.4	234	1.07%
Other	1,854	8.47%
MailEnable (20,551 servers)
Version	Number of Servers	Percent
1.981--	4,060	19.76%
1.96--	2,140	10.41%
0-2.37-	1,769	8.61%
1.95--	1,682	8.18%
1.9--	1,680	8.17%
1.8--	1,665	8.10%
0-1.85-	1,117	5.44%
0--2.37	966	4.70%
0-2.36-	747	3.63%
0-1.841-	355	1.73%
0--2.36	270	1.31%
0-1.75-	239	1.16%
0-1.54-	238	1.16%
1.73--	228	1.11%
Other	3,395	16.52%
Merak (8,651 servers)
Version	Number of Servers	Percent
8.9.1	2,213	25.58%
8.0.3	2,000	23.12%
8.5.0	788	9.11%
8.3.8	392	4.53%
7.4.5	381	4.40%
7.5.2	324	3.75%
7.6.4	298	3.44%
7.4.2	194	2.24%
8.9.0	182	2.10%
7.2.0	155	1.79%
8.2.4	144	1.66%
6.2.1	105	1.21%
8.3.0	104	1.20%
7.4.0	95	1.10%
Other	1,276	14.75%
Lotus Domino (7,744 servers)
Version	Number of Servers	Percent
7.0.2	938	12.11%
7.0.1	623	8.04%
6.5.4	620	8.01%
6.5.1	575	7.43%
7.0.2FP1	492	6.35%
6.5.3	454	5.86%
6.5.5	415	5.36%
7.0	374	4.83%
6.5	321	4.15%
5.0.11	255	3.29%
6.5.2	250	3.23%
5.0.12	182	2.35%
6.5.5FP2	161	2.08%
7.0.1FP1	158	2.04%
5.0.8	147	1.90%
5.0.10	137	1.77%
5.0.13a	128	1.65%
6.5.4FP2	113	1.46%
6.5.4FP3	106	1.37%
6.0.2CF1	101	1.30%
6.0	94	1.21%
6.0.3	90	1.16%
6.5.5FP1	82	1.06%
Other	928	11.98%
CommuniGate Pro (5,140 servers)
Version	Number of Servers	Percent
4.1.8	664	12.92%
4.2.10	494	9.61%
5.1.9	347	6.75%
5.0.9	259	5.04%
5.1.7	240	4.67%
5.1.8	211	4.11%
5.0.13	178	3.46%
4.2.8	125	2.43%
5.0.8	116	2.26%
4.2.7	116	2.26%
4.2	114	2.22%
4.3.12	112	2.18%
5.0.11	111	2.16%
5.1.3	108	2.10%
5.1.5	106	2.06%
4.2.9	102	1.98%
4.0.1	93	1.81%
5.1.6	89	1.73%
4.0.6	86	1.67%
4.3.8	74	1.44%
5.1.4	73	1.42%
3.5.9	68	1.32%
5.1.2	65	1.26%
5.0.6	57	1.11%
5.0.10	56	1.09%
5.1.1	55	1.07%
Other	1,021	19.86%
Kerio (4,666 servers)
Version	Number of Servers	Percent
6.3.1	1,594	34.16%
6.4.0	770	16.50%
6.3.0	432	9.26%
6.2.2	198	4.24%
6.1.3	166	3.56%
6.2.0	160	3.43%
6.1.2	154	3.30%
6.1.0	150	3.21%
6.0.10	133	2.85%
6.1.4	121	2.59%
6.0.3	87	1.86%
6.1.1	75	1.61%
6.2.1	61	1.31%
6.0.8	57	1.22%
5.7.10	50	1.07%
6.0.9	47	1.01%
Other	411	8.81%
Trend Micro (4,641 servers)
Version	Number of Servers	Percent
5.5	2,151	46.35%
5.7	1,932	41.63%
5.18	477	10.28%
Other	81	1.75%
WinWebMail (4,360 servers)
Version	Number of Servers	Percent
3.7.3.1	1,376	31.56%
3.7.1.1	1,032	23.67%
3.6.3.1	737	16.90%
3.7.0.5	483	11.08%
3.7.0.7	373	8.56%
3.7.0.3	310	7.11%
Other	49	1.12%
GroupWise (3,741 servers)
Version	Number of Servers	Percent
7.0.1	947	25.31%
7.0.2	460	12.30%
6.5.7	440	11.76%
6.5.4	368	9.84%
6.0.4	242	6.47%
6.5.6	237	6.34%
7.0	196	5.24%
6.5.5	178	4.76%
6.5.1	160	4.28%
6.5.3	81	2.17%
6.0.2	76	2.03%
6.5.2	71	1.90%
6.0.3	66	1.76%
5.5.5	54	1.44%
6.5.0	45	1.20%
6.0.1	44	1.18%
Other	76	2.03%
ArGoSoft (3,000 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	619	20.63%
1.8 (1.8.9.1)	529	17.63%
1.8 (1.8.8.7)	436	14.53%
1.8 (1.8.8.9)	259	8.63%
1.8 (1.8.9.0)	146	4.87%
1.8 (1.8.8.1)	85	2.83%
1.8 (1.8.6.0)	77	2.57%
1.8 (1.8.8.2)	64	2.13%
1.8 (1.8.8.3)	56	1.87%
1.8 (1.8.8.5)	50	1.67%
1.8 (1.8.5.9)	46	1.53%
1.8 (1.8.7.5)	42	1.40%
1.8 (1.8.8.9	40	1.33%
1.8 (1.8.8.4)	39	1.30%
1.8 (1.8.6.6)	32	1.07%
Other	480	16.00%
XMail (2,499 servers)
Version	Number of Servers	Percent
1.22	910	36.41%
1.21	416	16.65%
1.24	364	14.57%
1.20	199	7.96%
1.17	168	6.72%
1.23	142	5.68%
1.12	80	3.20%
1.18	52	2.08%
1.16	37	1.48%
1.15	26	1.04%
1.10	25	1.00%
Other	80	3.20%
SurgeSMTP (1,731 servers)
Version	Number of Servers	Percent
3.8i3-3	513	29.64%
3.8f3-3	206	11.90%
3.7b8-8	193	11.15%
3.8f2-2	135	7.80%
3.8i-1	128	7.39%
3.6f5-5	112	6.47%
3.5b3-3	71	4.10%
3.0c2-2	53	3.06%
3.7b6-6	47	2.72%
2.0g2-1	26	1.50%
3.8g-21	24	1.39%
2.1c7-7	22	1.27%
1.8g3	18	1.04%
Other	183	10.57%
Gordano Messaging Suite (GMS) (1,394 servers)
Version	Number of Servers	Percent
Other	1,394	100.00%
Qmail Toaster (1,381 servers)
Version	Number of Servers	Percent
1.3	813	58.87%
1.2	465	33.67%
1.0	103	7.46%
Other	0	0.00%
Post.Office (1,145 servers)
Version	Number of Servers	Percent
3.5.3	347	30.31%
3.5.3J	99	8.65%
4.0.1	80	6.99%
3.8.3	71	6.20%
3.6.3	63	5.50%
3.6.2	45	3.93%
3.1.2J	43	3.76%
3.9.1	39	3.41%
3.1.2	32	2.79%
3.9.2.3	30	2.62%
3.9.2	29	2.53%
3.9.0	27	2.36%
3.8.7.4	23	2.01%
3.8.4	23	2.01%
4.0.0.2	23	2.01%
3.5.2	21	1.83%
3.6.0	16	1.40%
4.0.0.1	14	1.22%
3.9.1.3	12	1.05%
3.9.2.1	12	1.05%
Other	96	8.38%
NetIQ MailMarshal (1,083 servers)
Version	Number of Servers	Percent
6.0.3.8	815	75.25%
5.5.6.7	66	6.09%
6.1.3.15	55	5.08%
5.5.6.6	27	2.49%
5.5.5.9	25	2.31%
5.5.4.16	21	1.94%
5.5.6.5	20	1.85%
5.5.5.6	13	1.20%
Other	41	3.79%
InterScan VirusWall (1,082 servers)
Version	Number of Servers	Percent
Other	1,082	100.00%
Interscan (900 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	197	21.89%
3.81-Build_1022	119	13.22%
3.8-Build_3013	98	10.89%
3.53 (build 2011)	80	8.89%
3.55 (build 1029)	76	8.44%
3.53 (build 2017)	66	7.33%
3.53 (build 2013)	43	4.78%
3.55 (build 1020)	32	3.56%
3.53 (build 1493)	29	3.22%
3.52 (build 1375)	28	3.11%
3.8-Build_1080	17	1.89%
3.81-Build_1084	12	1.33%
3.8-Build_3065	11	1.22%
Other	92	10.22%
VisNetic (623 servers)
Version	Number of Servers	Percent
8.5.0.8	116	18.62%
7.2.4.1	50	8.03%
5.8.6.6	42	6.74%
8.0.3.0	41	6.58%
8.3.5.0	37	5.94%
5.0.2.3	37	5.94%
6.2.2.0	35	5.62%
8.0.3.1	34	5.46%
7.6.1.0	30	4.82%
5.5.8.3	29	4.65%
8.3.6	20	3.21%
5.3.5.0	17	2.73%
8.0.3	16	2.57%
8.5.0.5	15	2.41%
5.4.5.4	15	2.41%
7.5.3.0	10	1.61%
7.2.4.0	9	1.44%
8.3.0.1	9	1.44%
5.8.6.4	8	1.28%
8.9.2.0	7	1.12%
Other	46	7.38%
Mirapoint (566 servers)
Version	Number of Servers	Percent
3.8.3-GA	128	22.61%
3.7.5a-GA	98	17.31%
3.8.2-GA	73	12.90%
3.8.4-GA	66	11.66%
3.7.3a-GA	41	7.24%
3.7.4b-GA	32	5.65%
3.7.5-GA	21	3.71%
3.5.8-GR	13	2.30%
3.7.1-GA	13	2.30%
1.1.0	11	1.94%
3.7.2-GA	11	1.94%
3.7.0-GA	8	1.41%
3.6.6-GR	8	1.41%
3.7.3-GA	6	1.06%
Other	37	6.54%
ModusMail (509 servers)
Version	Number of Servers	Percent
4.35.480.0	309	60.71%
3.2.315.0	33	6.48%
4.1.361.21	26	5.11%
4.2.425.22	25	4.91%
4.35.477.0	21	4.13%
3.1.297.0	17	3.34%
4.35.480.11	12	2.36%
3.1.302.0	10	1.96%
4.3.459.0	9	1.77%
3.0.273.0	7	1.38%
4.2.425.4	7	1.38%
Other	33	6.48%
MagicMail (293 servers)
Version	Number of Servers	Percent
Other	293	100.00%
Mercury (291 servers)
Version	Number of Servers	Percent
1.48	129	44.33%
3.32	103	35.40%
3.21c	21	7.22%
3.31	14	4.81%
1.44	12	4.12%
1.47	6	2.06%
Other	6	2.06%
WebSTAR V (282 servers)
Version	Number of Servers	Percent
5.4.0	84	29.79%
5.4.1	74	26.24%
5.3.4	62	21.99%
5.3.3	26	9.22%
5.3.2	22	7.80%
5.3.0	10	3.55%
5.2.4	3	1.06%
Other	1	0.35%
MAILsweeper (201 servers)
Version	Number of Servers	Percent
4.3.20.0	38	18.91%
4.3.12.0	34	16.92%
4.3.17.0	28	13.93%
4.3.19.0	28	13.93%
4.3.14.0	24	11.94%
4.2.10.0	12	5.97%
4.2.1.0	8	3.98%
4.3.1.0	7	3.48%
4.3.6.0	7	3.48%
4.3.10.0	7	3.48%
4.2.5.0	5	2.49%
Other	3	1.49%
Neon Mail Server (181 servers)
Version	Number of Servers	Percent
3.0.9	75	41.44%
3.0.7	57	31.49%
3.1.0	29	16.02%
3.0.8	9	4.97%
3.0.6	7	3.87%
3.0.4	2	1.10%
3.0.5	2	1.10%
Other	0	0.00%
MessageWall (122 servers)
Version	Number of Servers	Percent
1.0.8	92	75.41%
1.0.11	17	13.93%
1.1.23	7	5.74%
1.0.6	3	2.46%
1.1.0	2	1.64%
Other	1	0.82%
WebSTAR (117 servers)
Version	Number of Servers	Percent
Other	117	100.00%
OpenVMS (33 servers)
Version	Number of Servers	Percent
7.3	12	36.36%
8.2	10	30.30%
8.3	6	18.18%
7.2	4	12.12%
6.1	1	3.03%
Other	0	0.00%