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	2,471,319	100.0%
Number of Servers that didn't respond	446,893	18.08%
Server didn't open socket	435,702	17.63%
Server didn't provide banner	11,191	0.45%
Server provided banner	2,024,426	81.92%
Server banner identifies software in use	1,107,384	44.81%

As indicated by the above table, of the 2,471,319 servers queried, only 1,107,384 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	531,623	48.01%
Postfix	293,508	26.50%
Sendmail	115,650	10.44%
Microsoft	84,742	7.65%
MailEnable	32,929	2.97%
MDaemon	20,864	1.88%
IMail	7,014	0.63%
Lotus Domino	4,475	0.40%
WinWebMail	3,167	0.29%
CommuniGate Pro	3,105	0.28%
XMail	2,094	0.19%
Qmail Toaster	1,611	0.15%
Kerio	1,437	0.13%
Merak	1,164	0.11%
SurgeSMTP	1,016	0.09%
ArGoSoft	643	0.06%
GroupWise	427	0.04%
Post.Office	360	0.03%
MagicMail	321	0.03%
Gordano Messaging Suite (GMS)	308	0.03%
Trend Micro	299	0.03%
Mirapoint	126	0.01%
VisNetic	122	0.01%
InterScan VirusWall	117	0.01%
Mercury	50	0.00%
Interscan	41	0.00%
OpenSMTPD	28	0.00%
NetIQ MailMarshal	27	0.00%
WebSTAR V	24	0.00%
Neon Mail Server	22	0.00%
OpenVMS	20	0.00%
MessageWall	19	0.00%
WebSTAR	14	0.00%
ModusMail	12	0.00%
MAILsweeper	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (531,623 servers)
Version	Number of Servers	Percent
4.80	411,496	77.40%
4.72	22,792	4.29%
4.69	21,346	4.02%
4.80.1	20,184	3.80%
4.77	17,873	3.36%
4.76	14,798	2.78%
Other	23,134	4.35%
Postfix (293,508 servers)
Version	Number of Servers	Percent
Other	293,508	100.00%
Sendmail (115,650 servers)
Version	Number of Servers	Percent
8.13.8	30,629	26.48%
8.13.1	16,902	14.61%
8.14.3	15,580	13.47%
8.14.5	13,371	11.56%
8.14.4	12,743	11.02%
8.12.11.20060308	4,401	3.81%
8.13.6.20060614	3,344	2.89%
8.14.2	3,006	2.60%
8.11.6	2,030	1.76%
8.12.10	1,776	1.54%
8.14.1	1,656	1.43%
8.13.6	1,421	1.23%
8.13.7	1,306	1.13%
8.12.11.20060614	1,176	1.02%
Other	6,309	5.46%
Microsoft (84,742 servers)
Version	Number of Servers	Percent
6.0.3790.4675	68,552	80.89%
6.0.3790.3959	8,529	10.06%
6.0.3790.1830	2,346	2.77%
7.5.7601.17514	2,013	2.38%
5.0.2195.7381	863	1.02%
Other	2,439	2.88%
MailEnable (32,929 servers)
Version	Number of Servers	Percent
1.986--	5,808	17.64%
5.10--	2,452	7.45%
6.5--	1,962	5.96%
4.26--	1,947	5.91%
6.0--	1,374	4.17%
1.981--	1,059	3.22%
1.983--	625	1.90%
3.62--	567	1.72%
0-3.63-	551	1.67%
5.51--	550	1.67%
6.70--	539	1.64%
6.03--	535	1.62%
6.57--	505	1.53%
6.60--	444	1.35%
5.11--	370	1.12%
6.53--	357	1.08%
0-1.87-	337	1.02%
Other	12,947	39.32%
MDaemon (20,864 servers)
Version	Number of Servers	Percent
13.0.4	2,275	10.90%
13.0.5	1,842	8.83%
11.0.3	1,706	8.18%
13.0.3	1,530	7.33%
11.0.0	1,244	5.96%
10.0.0	758	3.63%
12.5.6	736	3.53%
13.0.2	658	3.15%
10.1.2	626	3.00%
10.1.1	605	2.90%
9.6.1	463	2.22%
9.6.6	426	2.04%
10.1.0	405	1.94%
12.5.4	397	1.90%
13.0.0	324	1.55%
12.5.8	302	1.45%
9.5.2	289	1.39%
9.6.2	281	1.35%
12.0.3	270	1.29%
9.6.5	256	1.23%
12.5.3	253	1.21%
10.0.5	246	1.18%
10.0.2	232	1.11%
9.5.1	221	1.06%
9.5.6	220	1.05%
Other	4,299	20.60%
IMail (7,014 servers)
Version	Number of Servers	Percent
8.22	1,149	16.38%
12.2.0.235	935	13.33%
11.5	627	8.94%
8.15	452	6.44%
9.23	407	5.80%
11.03	370	5.28%
12.1.0.270	355	5.06%
12.2.0.169	282	4.02%
8.05	258	3.68%
11.01	239	3.41%
10.02	225	3.21%
7.07	152	2.17%
6.06	127	1.81%
7.15	126	1.80%
8.00	118	1.68%
11.0	103	1.47%
11.02	100	1.43%
10.01	98	1.40%
Other	891	12.70%
Lotus Domino (4,475 servers)
Version	Number of Servers	Percent
8.5.3	773	17.27%
8.5.3FP3	377	8.42%
8.5.3FP2	279	6.23%
8.5.2	262	5.85%
8.5.3FP1	207	4.63%
8.5.2FP2	194	4.34%
8.5.1	184	4.11%
7.0.2	167	3.73%
8.5	139	3.11%
8.5.2FP3	131	2.93%
7.0.3	102	2.28%
8.5.2FP4	101	2.26%
8.5.1FP5	81	1.81%
8.5.2FP1	80	1.79%
7.0.1	75	1.68%
6.5.4	73	1.63%
8.0.1	72	1.61%
8.0.2	71	1.59%
7.0	69	1.54%
6.5.1	67	1.50%
6.5.3	66	1.47%
8.0	56	1.25%
6.5.5	49	1.09%
6.5	47	1.05%
Other	753	16.83%
WinWebMail (3,167 servers)
Version	Number of Servers	Percent
3.8.1.3	616	19.45%
3.8.0.1	394	12.44%
3.7.6.1	313	9.88%
3.8.1.5	269	8.49%
3.7.3.1	228	7.20%
3.8.1.1	225	7.10%
3.8.2.1	201	6.35%
3.7.7.3	195	6.16%
3.8.5.1	117	3.69%
3.8.3.1	110	3.47%
3.7.1.1	98	3.09%
3.8.3.3	88	2.78%
3.7.5.1	85	2.68%
3.6.3.1	50	1.58%
3.7.7.1	43	1.36%
3.7.0.3	41	1.29%
3.7.0.5	38	1.20%
3.7.0.7	33	1.04%
Other	23	0.73%
CommuniGate Pro (3,105 servers)
Version	Number of Servers	Percent
5.1.16	283	9.11%
4.1.8	119	3.83%
5.2.20	111	3.57%
5.4.8	105	3.38%
6.0.4	104	3.35%
6.0.1	103	3.32%
5.4.4	90	2.90%
5.4.6	88	2.83%
5.3.13	82	2.64%
4.2.10	70	2.25%
5.3.15	69	2.22%
5.4.1	68	2.19%
5.4.5	64	2.06%
5.4.7	62	2.00%
5.2.16	59	1.90%
5.0.14	59	1.90%
5.1.12	57	1.84%
5.2.19	56	1.80%
5.2.3	55	1.77%
5.4.2	48	1.55%
5.4.3	48	1.55%
5.4.9	46	1.48%
5.4.10	43	1.38%
5.2.14	41	1.32%
5.4.0	35	1.13%
6.0.2	34	1.10%
5.2.12	33	1.06%
5.2.13	32	1.03%
Other	1,041	33.53%
XMail (2,094 servers)
Version	Number of Servers	Percent
1.27	613	29.27%
1.22	506	24.16%
1.25	334	15.95%
1.26	231	11.03%
1.24	142	6.78%
1.21	76	3.63%
1.23	43	2.05%
1.20	33	1.58%
1.17	31	1.48%
Other	85	4.06%
Qmail Toaster (1,611 servers)
Version	Number of Servers	Percent
1.3	1,524	94.60%
1.2	47	2.92%
Other	40	2.48%
Kerio (1,437 servers)
Version	Number of Servers	Percent
6.7.3	235	16.35%
6.6.2	148	10.30%
6.7.0	144	10.02%
6.5.0	114	7.93%
6.5.2	98	6.82%
6.7.2	83	5.78%
6.7.1	80	5.57%
6.4.1	79	5.50%
6.3.1	65	4.52%
6.4.0	51	3.55%
6.6.1	50	3.48%
6.5.1	44	3.06%
6.6.0	42	2.92%
6.4.2	29	2.02%
6.3.0	25	1.74%
6.0.10	21	1.46%
6.2.0	16	1.11%
Other	113	7.86%
Merak (1,164 servers)
Version	Number of Servers	Percent
8.0.3	453	38.92%
8.9.1	126	10.82%
8.5.0	75	6.44%
7.5.2	60	5.15%
8.3.8	54	4.64%
7.4.5	49	4.21%
7.6.4	44	3.78%
7.0.1	23	1.98%
9.0.0	20	1.72%
7.4.2	18	1.55%
7.6.1	18	1.55%
7.2.0	17	1.46%
8.9.0	14	1.20%
6.2.1	14	1.20%
8.2.4	13	1.12%
7.6.0	13	1.12%
4.4.2	13	1.12%
8.3.15	13	1.12%
Other	127	10.91%
SurgeSMTP (1,016 servers)
Version	Number of Servers	Percent
6.3c2-2	276	27.17%
6.1c-1	109	10.73%
5.2a-1	85	8.37%
5.3h2-2	71	6.99%
3.9e-1	47	4.63%
6.0a5-5	35	3.44%
3.8k4-4	26	2.56%
6.0a4-4	22	2.17%
4.0u4-4	21	2.07%
4.2d2-2	19	1.87%
6.3d-72	19	1.87%
4.3g2-2	18	1.77%
5.0e4-4	16	1.57%
3.8i3-3	15	1.48%
Other	237	23.33%
ArGoSoft (643 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	158	24.57%
1.8 (1.8.9.5)	90	14.00%
1.8 (1.8.9.3)	82	12.75%
1.8 (1.8.9.1)	73	11.35%
1.8 (1.8.8.8)	42	6.53%
1.8 (1.8.8.7)	41	6.38%
1.8 (1.8.9.2)	22	3.42%
1.8 (1.8.9.4)	19	2.95%
1.8 (1.8.8.9)	13	2.02%
1.8 (1.8.6.0)	10	1.56%
1.8 (1.8.7.3)	7	1.09%
1.8 (1.8.8.1)	7	1.09%
Other	79	12.29%
GroupWise (427 servers)
Version	Number of Servers	Percent
7.0.3	80	18.74%
8.0.2	67	15.69%
6.5.7	49	11.48%
7.0.4	33	7.73%
7.0.2	26	6.09%
6.5.6	24	5.62%
8.0.3	19	4.45%
6.5.4	16	3.75%
12.0.1	15	3.51%
7.0.1	14	3.28%
8.0.1	14	3.28%
6.0.4	13	3.04%
6.5.1	10	2.34%
8.0.0	9	2.11%
7.0	7	1.64%
12.0.0	7	1.64%
6.5.2	5	1.17%
6.5.5	5	1.17%
Other	14	3.28%
Post.Office (360 servers)
Version	Number of Servers	Percent
3.5.3	45	12.50%
4.1.0.2	34	9.44%
4.1.2.4	29	8.06%
4.0.1	21	5.83%
4.1.1	19	5.28%
3.9.2.3	14	3.89%
3.5.3J	13	3.61%
4.2	12	3.33%
3.9.2	11	3.06%
3.8.3	11	3.06%
4.1.0.3	10	2.78%
3.1.2	8	2.22%
3.1.2J	8	2.22%
4.1.0.4	8	2.22%
3.6.2	7	1.94%
4.2.2	7	1.94%
4.0.1.1	6	1.67%
4.1.2.3	6	1.67%
4.2.1.3	6	1.67%
4.1.2.2	6	1.67%
3.5.1	6	1.67%
3.9.1	6	1.67%
4.2.1.1	6	1.67%
3.9.1.2	5	1.39%
3.8.7.4	5	1.39%
3.9.2.2	4	1.11%
3.5.4	4	1.11%
4.1	4	1.11%
3.9.1.3	4	1.11%
Other	35	9.72%
MagicMail (321 servers)
Version	Number of Servers	Percent
Other	321	100.00%
Gordano Messaging Suite (GMS) (308 servers)
Version	Number of Servers	Percent
Other	308	100.00%
Trend Micro (299 servers)
Version	Number of Servers	Percent
5.7	116	38.80%
5.5	69	23.08%
5.18	51	17.06%
7.0	29	9.70%
7.1	22	7.36%
3.53	3	1.00%
Other	9	3.01%
Mirapoint (126 servers)
Version	Number of Servers	Percent
4.3.5-GA	18	14.29%
3.10.10a-GA	13	10.32%
4.2.3-GA	11	8.73%
4.1.10-GA	10	7.94%
3.10.9-GA	7	5.56%
4.3.6-GA	6	4.76%
3.10.8-GA	5	3.97%
4.1.4-GA	5	3.97%
4.1.9-GA	5	3.97%
4.2.4-GA	5	3.97%
4.1.8-GA	4	3.17%
4.1.3-GA	3	2.38%
3.7.5a-GA	3	2.38%
3.8.4-GA	3	2.38%
3.8.3-GA	3	2.38%
3.8.5-GA	3	2.38%
4.1.5-GA	3	2.38%
3.10.3-GA	2	1.59%
4.3.4-GA	2	1.59%
3.10.2-GA	2	1.59%
4.3.3-GA	2	1.59%
4.0.5a	2	1.59%
Other	9	7.14%
VisNetic (122 servers)
Version	Number of Servers	Percent
9.3.2.0	33	27.05%
9.1.4.1	16	13.11%
8.0.3.1	7	5.74%
7.6.1.0	6	4.92%
5.8.6.6	5	4.10%
6.2.2.0	5	4.10%
8.0.3.0	5	4.10%
7.2.4.1	5	4.10%
5.5.8.3	5	4.10%
8.5.0.8	4	3.28%
8.0.3	4	3.28%
5.0.2.3	4	3.28%
9.1.4.0	3	2.46%
8.3.5.0	2	1.64%
5.4.5.4	2	1.64%
5.8.6.4	2	1.64%
5.3.5.0	2	1.64%
Other	12	9.84%
InterScan VirusWall (117 servers)
Version	Number of Servers	Percent
Other	117	100.00%
Mercury (50 servers)
Version	Number of Servers	Percent
1.48	27	54.00%
3.32	13	26.00%
1.47	2	4.00%
3.21c	2	4.00%
3.01a	2	4.00%
3.21	1	2.00%
1.44	1	2.00%
4.x	1	2.00%
3.30	1	2.00%
Other	0	0.00%
Interscan (41 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	8	19.51%
3.81-Build_1022	8	19.51%
3.55 (build 1029)	6	14.63%
3.53 (build 1493)	4	9.76%
3.81-Build_1084	3	7.32%
3.53 (build 2011)	3	7.32%
3.8-Build_3013	2	4.88%
3.5 (build 1294)	1	2.44%
3.53 (build 2017)	1	2.44%
3.51 (build 1337)	1	2.44%
3.55 (build 1020)	1	2.44%
3.53 (build 2013)	1	2.44%
3.8-Build_3045	1	2.44%
3.8-Build_1080	1	2.44%
Other	0	0.00%
OpenSMTPD (28 servers)
Version	Number of Servers	Percent
Other	28	100.00%
NetIQ MailMarshal (27 servers)
Version	Number of Servers	Percent
6.0.3.8	18	66.67%
5.5.6.7	3	11.11%
5.5.6.5	2	7.41%
5.5.6.6	2	7.41%
5.5.5.6	1	3.70%
5.5.4.17	1	3.70%
Other	0	0.00%
WebSTAR V (24 servers)
Version	Number of Servers	Percent
5.4.1	14	58.33%
5.4.0	5	20.83%
5.3.2	2	8.33%
5.3.4	2	8.33%
5.3.3	1	4.17%
Other	0	0.00%
Neon Mail Server (22 servers)
Version	Number of Servers	Percent
3.0.7	6	27.27%
3.1.3	4	18.18%
3.1.4	3	13.64%
3.1.2	3	13.64%
3.0.9	2	9.09%
3.1.0	2	9.09%
3.1.5	1	4.55%
3.0.6	1	4.55%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	9	45.00%
8.4	6	30.00%
7.3	4	20.00%
8.2	1	5.00%
Other	0	0.00%
MessageWall (19 servers)
Version	Number of Servers	Percent
1.0.8	18	94.74%
1.0.6	1	5.26%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (12 servers)
Version	Number of Servers	Percent
4.35.477.0	6	50.00%
4.1.361.21	1	8.33%
3.2.315.0	1	8.33%
4.0.340.3	1	8.33%
4.35.480.0	1	8.33%
4.35.477.8	1	8.33%
3.1.302.0	1	8.33%
Other	0	0.00%
MAILsweeper (5 servers)
Version	Number of Servers	Percent
4.3.17.0	2	40.00%
4.3.19.0	2	40.00%
4.3.20.0	1	20.00%
Other	0	0.00%