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	1,795,127	100.0%
Number of Servers that didn't respond	286,624	15.97%
Server didn't open socket	275,833	15.37%
Server didn't provide banner	10,791	0.60%
Server provided banner	1,508,503	84.03%
Server banner identifies software in use	887,499	49.44%

As indicated by the above table, of the 1,795,127 servers queried, only 887,499 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	222,903	25.12%
Sendmail	217,565	24.51%
Microsoft	190,066	21.42%
Postfix	145,995	16.45%
MailEnable	24,505	2.76%
MDaemon	21,768	2.45%
IMail	20,400	2.30%
Lotus Domino	6,027	0.68%
Kerio	5,716	0.64%
Merak	5,053	0.57%
WinWebMail	4,881	0.55%
CommuniGate Pro	4,559	0.51%
GroupWise	2,485	0.28%
XMail	2,438	0.27%
Trend Micro	2,422	0.27%
ArGoSoft	2,223	0.25%
SurgeSMTP	1,666	0.19%
Qmail Toaster	1,647	0.19%
Gordano Messaging Suite (GMS)	880	0.10%
Post.Office	688	0.08%
Mirapoint	550	0.06%
InterScan VirusWall	527	0.06%
VisNetic	486	0.05%
NetIQ MailMarshal	485	0.05%
MagicMail	424	0.05%
Interscan	351	0.04%
WebSTAR V	165	0.02%
Mercury	149	0.02%
Neon Mail Server	145	0.02%
ModusMail	106	0.01%
MessageWall	73	0.01%
WebSTAR	66	0.01%
MAILsweeper	60	0.01%
OpenVMS	25	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (222,903 servers)
Version	Number of Servers	Percent
4.69	139,951	62.79%
4.68	25,209	11.31%
4.63	23,944	10.74%
4.67	7,833	3.51%
4.60	5,107	2.29%
4.66	4,822	2.16%
4.50	4,247	1.91%
4.62	4,228	1.90%
Other	7,562	3.39%
Sendmail (217,565 servers)
Version	Number of Servers	Percent
8.13.1	35,267	16.21%
8.12.11.20060614	29,117	13.38%
8.13.6	21,387	9.83%
8.12.11.20060308	19,858	9.13%
8.13.8	17,639	8.11%
8.11.6	15,733	7.23%
8.12.10	11,611	5.34%
8.13.6.20060614	10,931	5.02%
8.12.11	8,647	3.97%
8.14.1	8,539	3.92%
8.13.4	5,907	2.72%
8.14.2	5,724	2.63%
8.13.7	5,051	2.32%
8.12.8	4,641	2.13%
8.14.3	3,556	1.63%
8.9.3	2,663	1.22%
8.10.2	2,313	1.06%
Other	8,981	4.13%
Microsoft (190,066 servers)
Version	Number of Servers	Percent
6.0.3790.3959	135,630	71.36%
6.0.3790.1830	32,494	17.10%
5.0.2195.6713	13,909	7.32%
6.0.3790.211	4,556	2.40%
Other	3,477	1.83%
Postfix (145,995 servers)
Version	Number of Servers	Percent
Other	145,995	100.00%
MailEnable (24,505 servers)
Version	Number of Servers	Percent
1.981--	5,620	22.93%
1.983--	3,175	12.96%
1.986--	1,778	7.26%
1.96--	1,359	5.55%
1.95--	1,277	5.21%
1.9--	1,068	4.36%
0-3.14-	935	3.82%
1.8--	837	3.42%
0-2.37-	721	2.94%
0-1.85-	607	2.48%
0--3.14	475	1.94%
0-2.52-	383	1.56%
0-2.38-	340	1.39%
0-3.04-	312	1.27%
0-2.36-	300	1.22%
0-3.52-	274	1.12%
Other	5,044	20.58%
MDaemon (21,768 servers)
Version	Number of Servers	Percent
9.6.6	4,753	21.83%
9.6.5	2,206	10.13%
9.6.1	1,420	6.52%
9.6.4	1,286	5.91%
9.6.2	975	4.48%
8.1.3	854	3.92%
9.5.6	840	3.86%
9.5.2	749	3.44%
9.0.4	748	3.44%
9.6.3	646	2.97%
9.5.1	628	2.88%
6.8.5	477	2.19%
7.2.3	458	2.10%
7.2.0	407	1.87%
9.0.1	376	1.73%
9.0.0	300	1.38%
9.5.5	292	1.34%
8.0.2	290	1.33%
8.1.4	283	1.30%
9.5.4	251	1.15%
8.1.1	231	1.06%
9.6.0	227	1.04%
8.1.5	219	1.01%
Other	2,852	13.10%
IMail (20,400 servers)
Version	Number of Servers	Percent
8.22	4,431	21.72%
8.15	2,744	13.45%
9.23	2,074	10.17%
8.05	1,252	6.14%
9.10	1,119	5.49%
10.0	964	4.73%
7.07	818	4.01%
9.21	792	3.88%
7.15	683	3.35%
9.22	622	3.05%
6.06	527	2.58%
10.01	514	2.52%
8.00	473	2.32%
9.20	434	2.13%
8.21	383	1.88%
8.04	332	1.63%
8.01	256	1.25%
8.10	246	1.21%
8.20	234	1.15%
Other	1,502	7.36%
Lotus Domino (6,027 servers)
Version	Number of Servers	Percent
7.0.2	672	11.15%
8.0.1	651	10.80%
7.0.3	369	6.12%
7.0.1	344	5.71%
6.5.4	330	5.48%
7.0.2FP2	308	5.11%
6.5.1	304	5.04%
6.5.3	282	4.68%
7.0	238	3.95%
8.0	236	3.92%
6.5.5	233	3.87%
6.5	193	3.20%
7.0.2FP1	162	2.69%
7.0.3FP1	148	2.46%
5.0.11	122	2.02%
6.5.2	108	1.79%
6.5.6	80	1.33%
5.0.12	72	1.19%
7.0.2FP3	69	1.14%
5.0.8	67	1.11%
6.5.5FP2	63	1.05%
5.0.10	63	1.05%
5.0.13a	62	1.03%
7.0.1FP1	61	1.01%
Other	790	13.11%
Kerio (5,716 servers)
Version	Number of Servers	Percent
6.5.1	956	16.72%
6.5.2	918	16.06%
6.5.0	881	15.41%
6.4.1	576	10.08%
6.3.1	491	8.59%
6.4.2	397	6.95%
6.4.0	355	6.21%
6.3.0	204	3.57%
6.1.3	83	1.45%
6.1.0	76	1.33%
6.2.2	76	1.33%
6.0.10	71	1.24%
6.2.0	64	1.12%
6.1.4	60	1.05%
6.0.3	58	1.01%
Other	450	7.87%
Merak (5,053 servers)
Version	Number of Servers	Percent
8.0.3	1,932	38.23%
8.9.1	520	10.29%
8.5.0	353	6.99%
7.4.5	259	5.13%
7.5.2	232	4.59%
7.6.4	227	4.49%
8.3.8	219	4.33%
7.4.2	116	2.30%
9.0.0	106	2.10%
7.6.1	78	1.54%
6.2.1	76	1.50%
7.2.0	75	1.48%
8.2.4	69	1.37%
8.2.13	55	1.09%
8.9.0	54	1.07%
Other	682	13.50%
WinWebMail (4,881 servers)
Version	Number of Servers	Percent
3.7.6.1	1,327	27.19%
3.7.3.1	1,281	26.24%
3.7.1.1	705	14.44%
3.7.5.1	421	8.63%
3.6.3.1	373	7.64%
3.7.0.5	326	6.68%
3.7.0.7	212	4.34%
3.7.0.3	188	3.85%
Other	48	0.98%
CommuniGate Pro (4,559 servers)
Version	Number of Servers	Percent
4.1.8	385	8.44%
4.2.10	265	5.81%
5.1.13	259	5.68%
5.1.12	218	4.78%
5.2.5	171	3.75%
5.2.3	167	3.66%
5.1.16	160	3.51%
5.1.14	148	3.25%
5.2.0	143	3.14%
5.2.6	141	3.09%
5.1.10	140	3.07%
5.0.9	128	2.81%
5.0.13	126	2.76%
5.1.8	101	2.22%
5.1.7	97	2.13%
5.2.2	92	2.02%
5.0.14	82	1.80%
5.1.9	82	1.80%
5.2.1	72	1.58%
5.1.11	72	1.58%
4.2	68	1.49%
4.2.8	62	1.36%
4.2.9	61	1.34%
4.2.7	61	1.34%
4.3.12	58	1.27%
5.1.5	52	1.14%
5.0.11	52	1.14%
4.0.6	52	1.14%
5.0.8	48	1.05%
5.2.4	48	1.05%
Other	948	20.79%
GroupWise (2,485 servers)
Version	Number of Servers	Percent
7.0.2	595	23.94%
7.0.3	592	23.82%
6.5.7	294	11.83%
7.0.1	246	9.90%
6.5.4	176	7.08%
6.5.6	116	4.67%
6.0.4	93	3.74%
7.0	70	2.82%
6.5.5	70	2.82%
6.5.1	70	2.82%
6.5.2	27	1.09%
Other	136	5.47%
XMail (2,438 servers)
Version	Number of Servers	Percent
1.22	757	31.05%
1.24	484	19.85%
1.25	443	18.17%
1.21	235	9.64%
1.20	108	4.43%
1.23	107	4.39%
1.17	101	4.14%
1.12	74	3.04%
1.16	40	1.64%
1.18	25	1.03%
Other	64	2.63%
Trend Micro (2,422 servers)
Version	Number of Servers	Percent
5.7	1,166	48.14%
5.5	831	34.31%
5.18	295	12.18%
7.0	88	3.63%
Other	42	1.73%
ArGoSoft (2,223 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.3)	396	17.81%
1.8 (1.8.9.5)	345	15.52%
1.8 (1.8.9.1)	281	12.64%
1.8 (1.8.8.8)	203	9.13%
1.8 (1.8.8.7)	183	8.23%
1.8 (1.8.9.2)	129	5.80%
1.8 (1.8.9.4)	62	2.79%
1.8 (1.8.8.9)	61	2.74%
1.8 (1.8.8.1)	46	2.07%
1.8 (1.8.9.0)	46	2.07%
1.8 (1.8.8.2)	41	1.84%
1.8 (1.8.6.0)	41	1.84%
1.8 (1.8.5.9)	27	1.21%
1.8 (1.8.7.5)	23	1.03%
Other	339	15.25%
SurgeSMTP (1,666 servers)
Version	Number of Servers	Percent
3.9e-1	488	29.29%
3.8k4-4	229	13.75%
3.9c-1	216	12.97%
3.8f3-3	83	4.98%
3.7b8-8	77	4.62%
3.9g2-2	64	3.84%
3.8i3-3	57	3.42%
3.6f5-5	54	3.24%
3.5b3-3	53	3.18%
3.8f2-2	39	2.34%
3.0c2-2	34	2.04%
3.7b6-6	27	1.62%
3.8k2-2	19	1.14%
Other	226	13.57%
Qmail Toaster (1,647 servers)
Version	Number of Servers	Percent
1.3	1,313	79.72%
1.2	262	15.91%
1.0	54	3.28%
1.5	17	1.03%
Other	1	0.06%
Gordano Messaging Suite (GMS) (880 servers)
Version	Number of Servers	Percent
Other	880	100.00%
Post.Office (688 servers)
Version	Number of Servers	Percent
3.5.3	198	28.78%
4.0.1	57	8.28%
3.5.3J	45	6.54%
3.6.3	35	5.09%
3.8.3	32	4.65%
4.1.0.2	30	4.36%
3.9.0	21	3.05%
3.6.2	21	3.05%
3.9.2.3	20	2.91%
3.9.2	19	2.76%
3.9.1	19	2.76%
3.8.7.4	19	2.76%
3.1.2	17	2.47%
3.1.2J	17	2.47%
3.8.4	15	2.18%
3.5.2	12	1.74%
4.1	10	1.45%
4.0.0.2	10	1.45%
3.6.0	8	1.16%
3.9.2.1	8	1.16%
4.0.0.1	8	1.16%
3.5.1	7	1.02%
Other	60	8.72%
Mirapoint (550 servers)
Version	Number of Servers	Percent
3.8.4-GA	97	17.64%
3.8.3-GA	91	16.55%
3.8.6-GA	71	12.91%
3.8.5-GA	55	10.00%
3.8.7a	46	8.36%
3.7.5a-GA	43	7.82%
3.8.2-GA	26	4.73%
3.7.3a-GA	22	4.00%
3.7.4b-GA	20	3.64%
4.0.5a	14	2.55%
3.7.5-GA	10	1.82%
3.10.1-FCS	9	1.64%
3.5.8-GR	8	1.45%
Other	38	6.91%
InterScan VirusWall (527 servers)
Version	Number of Servers	Percent
Other	527	100.00%
VisNetic (486 servers)
Version	Number of Servers	Percent
9.1.4.1	140	28.81%
9.1.4.0	32	6.58%
8.5.0.8	30	6.17%
5.8.6.6	24	4.94%
7.2.4.1	24	4.94%
5.0.2.3	23	4.73%
8.3.5.0	23	4.73%
8.0.3.0	22	4.53%
5.5.8.3	18	3.70%
8.0.3.1	16	3.29%
7.6.1.0	16	3.29%
6.2.2.0	14	2.88%
8.3.6	12	2.47%
5.3.5.0	12	2.47%
8.0.3	11	2.26%
5.4.5.4	8	1.65%
7.5.3.0	8	1.65%
5.8.6.4	7	1.44%
8.3.0.1	5	1.03%
8.5.0.5	5	1.03%
7.2.4.0	5	1.03%
6.0.9.0	5	1.03%
Other	26	5.35%
NetIQ MailMarshal (485 servers)
Version	Number of Servers	Percent
6.0.3.8	386	79.59%
5.5.6.7	24	4.95%
6.1.3.15	23	4.74%
5.5.6.6	11	2.27%
5.5.4.16	10	2.06%
5.5.5.9	7	1.44%
5.5.6.5	5	1.03%
5.5.4.17	5	1.03%
Other	14	2.89%
MagicMail (424 servers)
Version	Number of Servers	Percent
Other	424	100.00%
Interscan (351 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	64	18.23%
3.8-Build_3013	52	14.81%
3.81-Build_1022	50	14.25%
3.55 (build 1029)	38	10.83%
3.53 (build 2017)	24	6.84%
3.53 (build 2011)	21	5.98%
3.53 (build 2013)	15	4.27%
3.81-Build_1084	13	3.70%
3.53 (build 1493)	12	3.42%
3.55 (build 1020)	12	3.42%
3.52 (build 1375)	10	2.85%
3.8-Build_1080	6	1.71%
3.55 (build 1018)	5	1.42%
3.8-Build_3045	4	1.14%
Other	25	7.12%
WebSTAR V (165 servers)
Version	Number of Servers	Percent
5.4.1	53	32.12%
5.3.4	39	23.64%
5.4.0	36	21.82%
5.3.3	17	10.30%
5.3.2	14	8.48%
5.3.0	4	2.42%
5.3.1	2	1.21%
Other	0	0.00%
Mercury (149 servers)
Version	Number of Servers	Percent
1.48	70	46.98%
3.32	47	31.54%
3.21c	9	6.04%
3.31	6	4.03%
1.44	5	3.36%
1.47	5	3.36%
1.49	2	1.34%
3.21	2	1.34%
Other	3	2.01%
Neon Mail Server (145 servers)
Version	Number of Servers	Percent
3.1.3	45	31.03%
3.0.9	29	20.00%
3.0.7	23	15.86%
3.1.2	20	13.79%
3.1.0	18	12.41%
3.0.8	3	2.07%
3.1.1	3	2.07%
3.0.6	3	2.07%
Other	1	0.69%
ModusMail (106 servers)
Version	Number of Servers	Percent
4.35.480.0	37	34.91%
3.2.315.0	16	15.09%
4.3.459.0	8	7.55%
4.35.480.11	7	6.60%
3.1.302.0	7	6.60%
4.1.361.21	4	3.77%
4.1.361.0	4	3.77%
4.2.420.0	4	3.77%
4.35.477.0	4	3.77%
3.1.293.1	3	2.83%
4.2.425.4	2	1.89%
4.2.420.1	2	1.89%
4.0.340.0	2	1.89%
Other	6	5.66%
MessageWall (73 servers)
Version	Number of Servers	Percent
1.0.8	54	73.97%
1.0.11	16	21.92%
1.1.0	2	2.74%
1.0.6	1	1.37%
Other	0	0.00%
WebSTAR (66 servers)
Version	Number of Servers	Percent
Other	66	100.00%
MAILsweeper (60 servers)
Version	Number of Servers	Percent
4.3.20.0	16	26.67%
4.3.17.0	11	18.33%
4.3.14.0	8	13.33%
4.3.19.0	7	11.67%
4.3.1.0	5	8.33%
4.2.10.0	4	6.67%
4.3.12.0	3	5.00%
4.3.10.0	2	3.33%
4.3.6.0	2	3.33%
4.2.5.0	1	1.67%
4.1.5.0	1	1.67%
Other	0	0.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	12	48.00%
7.3	7	28.00%
8.2	3	12.00%
7.2	2	8.00%
6.1	1	4.00%
Other	0	0.00%