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	1,752,365	100.0%
Number of Servers that didn't respond	258,969	14.78%
Server didn't open socket	249,753	14.25%
Server didn't provide banner	9,216	0.53%
Server provided banner	1,493,396	85.22%
Server banner identifies software in use	915,230	52.23%

As indicated by the above table, of the 1,752,365 servers queried, only 915,230 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	269,138	29.41%
Microsoft	200,400	21.90%
Exim	181,492	19.83%
Postfix	133,801	14.62%
IMail	31,176	3.41%
MDaemon	22,129	2.42%
MailEnable	20,746	2.27%
Merak	8,705	0.95%
Lotus Domino	7,679	0.84%
CommuniGate Pro	5,175	0.57%
Kerio	4,801	0.52%
Trend Micro	4,553	0.50%
WinWebMail	4,454	0.49%
GroupWise	3,670	0.40%
ArGoSoft	2,974	0.32%
XMail	2,560	0.28%
SurgeSMTP	1,758	0.19%
Qmail Toaster	1,445	0.16%
Gordano Messaging Suite (GMS)	1,355	0.15%
Post.Office	1,124	0.12%
InterScan VirusWall	1,021	0.11%
NetIQ MailMarshal	1,015	0.11%
Interscan	891	0.10%
VisNetic	625	0.07%
Mirapoint	564	0.06%
ModusMail	496	0.05%
MagicMail	297	0.03%
Mercury	272	0.03%
WebSTAR V	270	0.03%
Neon Mail Server	187	0.02%
MAILsweeper	182	0.02%
MessageWall	121	0.01%
WebSTAR	118	0.01%
OpenVMS	36	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (269,138 servers)
Version	Number of Servers	Percent
8.12.11.20060614	45,459	16.89%
8.12.11.20060308	33,224	12.34%
8.11.6	27,416	10.19%
8.13.6	26,464	9.83%
8.13.1	25,996	9.66%
8.12.10	19,170	7.12%
8.13.8	16,337	6.07%
8.12.11	11,698	4.35%
8.13.6.20060614	10,248	3.81%
8.13.4	9,375	3.48%
8.12.8	8,316	3.09%
8.13.7	6,054	2.25%
8.10.2	5,329	1.98%
8.9.3	5,034	1.87%
8.14.1	3,282	1.22%
Other	15,736	5.85%
Microsoft (200,400 servers)
Version	Number of Servers	Percent
6.0.3790.1830	91,532	45.67%
6.0.3790.3959	60,836	30.36%
5.0.2195.6713	27,844	13.89%
6.0.3790.211	12,894	6.43%
Other	7,294	3.64%
Exim (181,492 servers)
Version	Number of Servers	Percent
4.63	80,395	44.30%
4.66	56,100	30.91%
4.50	8,920	4.91%
4.52	7,642	4.21%
4.60	7,523	4.15%
4.62	3,924	2.16%
4.67	3,898	2.15%
4.44	2,662	1.47%
Other	10,428	5.75%
Postfix (133,801 servers)
Version	Number of Servers	Percent
Other	133,801	100.00%
IMail (31,176 servers)
Version	Number of Servers	Percent
8.15	5,838	18.73%
8.22	5,816	18.66%
8.05	3,747	12.02%
9.10	2,847	9.13%
9.20	2,829	9.07%
7.15	1,317	4.22%
7.07	1,270	4.07%
6.06	979	3.14%
8.21	857	2.75%
8.00	612	1.96%
8.20	472	1.51%
8.10	459	1.47%
9.04	398	1.28%
8.02	351	1.13%
8.12	340	1.09%
Other	3,044	9.76%
MDaemon (22,129 servers)
Version	Number of Servers	Percent
9.5.6	3,187	14.40%
9.6.0	2,492	11.26%
9.6.1	1,359	6.14%
8.1.3	1,355	6.12%
9.0.4	1,159	5.24%
6.8.5	817	3.69%
9.5.2	723	3.27%
7.2.3	709	3.20%
9.5.1	701	3.17%
9.5.4	636	2.87%
9.5.5	624	2.82%
7.2.0	607	2.74%
9.0.1	569	2.57%
8.1.4	519	2.35%
8.0.2	475	2.15%
9.0.0	462	2.09%
9.5.3	458	2.07%
8.1.1	393	1.78%
8.0.3	340	1.54%
7.1.2	335	1.51%
9.0.7	331	1.50%
8.1.5	324	1.46%
9.0.6	305	1.38%
7.1.0	284	1.28%
7.2.2	279	1.26%
7.2.1	257	1.16%
8.0.1	241	1.09%
6.8.4	231	1.04%
7.0.1	231	1.04%
Other	1,726	7.80%
MailEnable (20,746 servers)
Version	Number of Servers	Percent
1.981--	4,394	21.18%
1.96--	2,140	10.32%
0-2.37-	1,709	8.24%
1.95--	1,661	8.01%
1.9--	1,637	7.89%
1.8--	1,567	7.55%
0-1.85-	1,078	5.20%
0--2.37	821	3.96%
0-2.36-	679	3.27%
0-1.841-	311	1.50%
0-2.38-	284	1.37%
0--2.38	243	1.17%
0-1.75-	232	1.12%
0-1.54-	216	1.04%
1.73--	214	1.03%
Other	3,560	17.16%
Merak (8,705 servers)
Version	Number of Servers	Percent
8.9.1	2,373	27.26%
8.0.3	2,013	23.12%
8.5.0	753	8.65%
7.4.5	365	4.19%
8.3.8	363	4.17%
7.5.2	324	3.72%
7.6.4	284	3.26%
7.4.2	189	2.17%
8.9.0	182	2.09%
7.2.0	145	1.67%
8.2.4	145	1.67%
6.2.1	101	1.16%
8.3.0	95	1.09%
7.4.0	92	1.06%
Other	1,281	14.72%
Lotus Domino (7,679 servers)
Version	Number of Servers	Percent
7.0.2	967	12.59%
7.0.1	596	7.76%
6.5.4	593	7.72%
6.5.1	561	7.31%
6.5.3	448	5.83%
6.5.5	416	5.42%
7.0.2FP1	409	5.33%
7.0	365	4.75%
6.5	307	4.00%
7.0.2FP2	270	3.52%
5.0.11	240	3.13%
6.5.2	237	3.09%
5.0.12	175	2.28%
6.5.5FP2	151	1.97%
5.0.8	148	1.93%
7.0.1FP1	143	1.86%
5.0.10	132	1.72%
5.0.13a	126	1.64%
6.5.4FP2	107	1.39%
6.0.2CF1	101	1.32%
6.0.3	90	1.17%
6.0	90	1.17%
6.5.4FP3	89	1.16%
6.5.5FP1	79	1.03%
Other	839	10.93%
CommuniGate Pro (5,175 servers)
Version	Number of Servers	Percent
4.1.8	645	12.46%
4.2.10	452	8.73%
5.1.10	347	6.71%
5.1.9	257	4.97%
5.0.9	249	4.81%
5.1.7	197	3.81%
5.1.8	197	3.81%
5.0.13	189	3.65%
4.2.8	125	2.42%
4.3.12	117	2.26%
4.2.7	114	2.20%
5.0.8	113	2.18%
4.2	111	2.14%
5.0.11	107	2.07%
4.2.9	100	1.93%
5.1.3	99	1.91%
4.0.1	94	1.82%
5.1.5	92	1.78%
5.1.6	86	1.66%
4.0.6	84	1.62%
4.3.8	71	1.37%
3.5.9	69	1.33%
5.1.4	65	1.26%
5.1.2	63	1.22%
5.0.10	54	1.04%
4.2.4	52	1.00%
Other	1,026	19.83%
Kerio (4,801 servers)
Version	Number of Servers	Percent
6.3.1	1,351	28.14%
6.4.0	1,305	27.18%
6.3.0	405	8.44%
6.2.2	185	3.85%
6.1.3	162	3.37%
6.2.0	148	3.08%
6.1.0	143	2.98%
6.1.2	143	2.98%
6.0.10	121	2.52%
6.1.4	112	2.33%
6.0.3	77	1.60%
6.1.1	71	1.48%
6.0.8	57	1.19%
6.2.1	56	1.17%
5.7.10	52	1.08%
Other	413	8.60%
Trend Micro (4,553 servers)
Version	Number of Servers	Percent
5.5	2,050	45.03%
5.7	1,940	42.61%
5.18	473	10.39%
Other	90	1.98%
WinWebMail (4,454 servers)
Version	Number of Servers	Percent
3.7.3.1	1,536	34.49%
3.7.1.1	1,047	23.51%
3.6.3.1	705	15.83%
3.7.0.5	475	10.66%
3.7.0.7	347	7.79%
3.7.0.3	298	6.69%
Other	46	1.03%
GroupWise (3,670 servers)
Version	Number of Servers	Percent
7.0.1	787	21.44%
7.0.2	650	17.71%
6.5.7	450	12.26%
6.5.4	347	9.46%
6.0.4	230	6.27%
6.5.6	226	6.16%
7.0	183	4.99%
6.5.5	169	4.60%
6.5.1	153	4.17%
6.5.3	71	1.93%
6.0.2	70	1.91%
6.5.2	64	1.74%
6.0.3	62	1.69%
5.5.5	50	1.36%
6.0.1	43	1.17%
6.5.0	39	1.06%
Other	76	2.07%
ArGoSoft (2,974 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	668	22.46%
1.8 (1.8.8.8)	559	18.80%
1.8 (1.8.8.7)	408	13.72%
1.8 (1.8.8.9)	235	7.90%
1.8 (1.8.9.0)	124	4.17%
1.8 (1.8.8.1)	84	2.82%
1.8 (1.8.6.0)	73	2.45%
1.8 (1.8.8.2)	60	2.02%
1.8 (1.8.8.3)	57	1.92%
1.8 (1.8.5.9)	51	1.71%
1.8 (1.8.8.5)	47	1.58%
1.8 (1.8.7.5)	44	1.48%
1.8 (1.8.8.4)	36	1.21%
1.8 (1.8.8.9	36	1.21%
1.8 (1.8.6.6)	31	1.04%
Other	461	15.50%
XMail (2,560 servers)
Version	Number of Servers	Percent
1.22	918	35.86%
1.24	420	16.41%
1.21	406	15.86%
1.20	191	7.46%
1.17	172	6.72%
1.23	142	5.55%
1.12	88	3.44%
1.18	53	2.07%
1.16	35	1.37%
1.10	28	1.09%
Other	107	4.18%
SurgeSMTP (1,758 servers)
Version	Number of Servers	Percent
3.8i3-3	541	30.77%
3.8f3-3	191	10.86%
3.7b8-8	189	10.75%
3.8f2-2	119	6.77%
3.8i-1	114	6.48%
3.6f5-5	109	6.20%
3.8k-1	94	5.35%
3.5b3-3	66	3.75%
3.0c2-2	54	3.07%
3.7b6-6	45	2.56%
2.0g2-1	22	1.25%
2.1c7-7	22	1.25%
Other	192	10.92%
Qmail Toaster (1,445 servers)
Version	Number of Servers	Percent
1.3	880	60.90%
1.2	469	32.46%
1.0	96	6.64%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,355 servers)
Version	Number of Servers	Percent
Other	1,355	100.00%
Post.Office (1,124 servers)
Version	Number of Servers	Percent
3.5.3	333	29.63%
3.5.3J	90	8.01%
4.0.1	84	7.47%
3.8.3	68	6.05%
3.6.3	62	5.52%
3.6.2	45	4.00%
3.1.2J	41	3.65%
3.9.1	39	3.47%
3.1.2	32	2.85%
3.9.2.3	32	2.85%
3.9.2	28	2.49%
3.9.0	27	2.40%
3.8.4	24	2.14%
4.0.0.2	23	2.05%
3.5.2	23	2.05%
3.8.7.4	21	1.87%
3.6.0	19	1.69%
4.0.0.1	14	1.25%
3.9.1.3	13	1.16%
3.8.2	12	1.07%
3.9.2.1	12	1.07%
Other	82	7.30%
InterScan VirusWall (1,021 servers)
Version	Number of Servers	Percent
Other	1,021	100.00%
NetIQ MailMarshal (1,015 servers)
Version	Number of Servers	Percent
6.0.3.8	771	75.96%
5.5.6.7	58	5.71%
6.1.3.15	49	4.83%
5.5.4.16	25	2.46%
5.5.6.6	24	2.36%
5.5.5.9	20	1.97%
5.5.6.5	19	1.87%
5.5.5.6	12	1.18%
Other	37	3.65%
Interscan (891 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	184	20.65%
3.81-Build_1022	114	12.79%
3.8-Build_3013	92	10.33%
3.53 (build 2011)	74	8.31%
3.55 (build 1029)	72	8.08%
3.53 (build 2017)	64	7.18%
3.81-Build_1084	48	5.39%
3.53 (build 2013)	42	4.71%
3.53 (build 1493)	31	3.48%
3.55 (build 1020)	29	3.25%
3.52 (build 1375)	27	3.03%
3.8-Build_1080	15	1.68%
3.8-Build_3065	12	1.35%
Other	87	9.76%
VisNetic (625 servers)
Version	Number of Servers	Percent
8.5.0.8	125	20.00%
7.2.4.1	50	8.00%
5.8.6.6	41	6.56%
8.0.3.0	40	6.40%
8.3.5.0	37	5.92%
5.0.2.3	35	5.60%
8.0.3.1	34	5.44%
6.2.2.0	33	5.28%
7.6.1.0	30	4.80%
5.5.8.3	28	4.48%
8.3.6	19	3.04%
5.3.5.0	17	2.72%
8.0.3	17	2.72%
8.5.0.5	16	2.56%
5.4.5.4	13	2.08%
7.5.3.0	12	1.92%
8.9.2.0	8	1.28%
8.3.0.1	8	1.28%
5.8.6.4	7	1.12%
5.0.2.1	7	1.12%
7.2.4.0	7	1.12%
5.0.1	7	1.12%
Other	34	5.44%
Mirapoint (564 servers)
Version	Number of Servers	Percent
3.8.3-GA	127	22.52%
3.8.4-GA	92	16.31%
3.7.5a-GA	86	15.25%
3.8.2-GA	68	12.06%
3.7.3a-GA	40	7.09%
3.7.4b-GA	36	6.38%
3.7.5-GA	20	3.55%
3.7.1-GA	12	2.13%
1.1.0	11	1.95%
3.5.8-GR	11	1.95%
3.7.2-GA	10	1.77%
3.7.0-GA	8	1.42%
3.7.3-GA	6	1.06%
Other	37	6.56%
ModusMail (496 servers)
Version	Number of Servers	Percent
4.35.480.0	290	58.47%
3.2.315.0	33	6.65%
4.1.361.21	29	5.85%
4.2.425.22	25	5.04%
4.35.477.0	22	4.44%
3.1.297.0	17	3.43%
4.35.480.11	13	2.62%
3.1.302.0	11	2.22%
3.0.273.0	11	2.22%
4.3.459.0	9	1.81%
4.2.425.4	7	1.41%
4.2.420.0	5	1.01%
Other	24	4.84%
MagicMail (297 servers)
Version	Number of Servers	Percent
Other	297	100.00%
Mercury (272 servers)
Version	Number of Servers	Percent
1.48	115	42.28%
3.32	100	36.76%
3.21c	24	8.82%
3.31	12	4.41%
1.44	11	4.04%
1.47	5	1.84%
Other	5	1.84%
WebSTAR V (270 servers)
Version	Number of Servers	Percent
5.4.0	80	29.63%
5.4.1	72	26.67%
5.3.4	58	21.48%
5.3.3	26	9.63%
5.3.2	21	7.78%
5.3.0	9	3.33%
5.2.4	3	1.11%
Other	1	0.37%
Neon Mail Server (187 servers)
Version	Number of Servers	Percent
3.0.9	75	40.11%
3.0.7	57	30.48%
3.1.0	34	18.18%
3.0.8	9	4.81%
3.0.6	8	4.28%
3.0.4	2	1.07%
3.0.5	2	1.07%
Other	0	0.00%
MAILsweeper (182 servers)
Version	Number of Servers	Percent
4.3.20.0	36	19.78%
4.3.12.0	28	15.38%
4.3.17.0	26	14.29%
4.3.14.0	25	13.74%
4.3.19.0	21	11.54%
4.2.10.0	10	5.49%
4.3.1.0	8	4.40%
4.3.6.0	7	3.85%
4.3.10.0	7	3.85%
4.2.1.0	6	3.30%
4.2.5.0	5	2.75%
4.1.2.0	2	1.10%
Other	1	0.55%
MessageWall (121 servers)
Version	Number of Servers	Percent
1.0.8	90	74.38%
1.0.11	17	14.05%
1.1.23	7	5.79%
1.0.6	3	2.48%
1.1.0	3	2.48%
Other	1	0.83%
WebSTAR (118 servers)
Version	Number of Servers	Percent
Other	118	100.00%
OpenVMS (36 servers)
Version	Number of Servers	Percent
7.3	15	41.67%
8.2	8	22.22%
8.3	8	22.22%
7.2	4	11.11%
6.1	1	2.78%
Other	0	0.00%