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	2,216,639	100.0%
Number of Servers that didn't respond	353,258	15.94%
Server didn't open socket	342,493	15.45%
Server didn't provide banner	10,765	0.49%
Server provided banner	1,863,381	84.06%
Server banner identifies software in use	1,020,166	46.02%

As indicated by the above table, of the 2,216,639 servers queried, only 1,020,166 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	467,133	45.79%
Postfix	230,885	22.63%
Sendmail	123,205	12.08%
Microsoft	114,586	11.23%
MailEnable	32,428	3.18%
MDaemon	20,101	1.97%
IMail	8,537	0.84%
Lotus Domino	4,455	0.44%
WinWebMail	3,604	0.35%
CommuniGate Pro	3,122	0.31%
XMail	2,114	0.21%
Kerio	1,956	0.19%
Qmail Toaster	1,580	0.15%
Merak	1,463	0.14%
SurgeSMTP	1,182	0.12%
ArGoSoft	884	0.09%
GroupWise	668	0.07%
Trend Micro	410	0.04%
Gordano Messaging Suite (GMS)	375	0.04%
Post.Office	331	0.03%
MagicMail	324	0.03%
Mirapoint	205	0.02%
VisNetic	161	0.02%
InterScan VirusWall	133	0.01%
NetIQ MailMarshal	57	0.01%
Interscan	53	0.01%
Mercury	51	0.00%
WebSTAR V	37	0.00%
Neon Mail Server	37	0.00%
OpenVMS	20	0.00%
MessageWall	19	0.00%
OpenSMTPD	17	0.00%
WebSTAR	15	0.00%
ModusMail	12	0.00%
MAILsweeper	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (467,133 servers)
Version	Number of Servers	Percent
4.69	369,543	79.11%
4.76	36,792	7.88%
4.72	19,126	4.09%
4.77	12,270	2.63%
4.67	7,984	1.71%
4.63	5,379	1.15%
Other	16,039	3.43%
Postfix (230,885 servers)
Version	Number of Servers	Percent
Other	230,885	100.00%
Sendmail (123,205 servers)
Version	Number of Servers	Percent
8.13.8	30,835	25.03%
8.13.1	20,746	16.84%
8.14.3	16,838	13.67%
8.14.5	10,427	8.46%
8.14.4	10,371	8.42%
8.12.11.20060308	5,228	4.24%
8.13.6.20060614	4,291	3.48%
8.14.2	3,680	2.99%
8.11.6	2,745	2.23%
8.12.10	2,507	2.03%
8.13.6	2,240	1.82%
8.14.1	2,150	1.75%
8.12.11.20060614	1,987	1.61%
8.13.7	1,718	1.39%
8.12.11	1,527	1.24%
8.12.8	1,235	1.00%
Other	4,680	3.80%
Microsoft (114,586 servers)
Version	Number of Servers	Percent
6.0.3790.4675	90,090	78.62%
6.0.3790.3959	15,145	13.22%
6.0.3790.1830	4,124	3.60%
5.0.2195.7381	1,336	1.17%
Other	3,891	3.40%
MailEnable (32,428 servers)
Version	Number of Servers	Percent
1.986--	8,853	27.30%
4.26--	2,547	7.85%
5.10--	2,085	6.43%
1.981--	1,715	5.29%
1.983--	1,078	3.32%
0-3.63-	788	2.43%
5.51--	757	2.33%
3.62--	729	2.25%
5.11--	651	2.01%
4.22--	463	1.43%
4.23--	405	1.25%
0-1.87-	404	1.25%
0-4.26-	394	1.21%
0-5.51-	386	1.19%
6.0--	354	1.09%
0-2.53-	333	1.03%
Other	10,486	32.34%
MDaemon (20,101 servers)
Version	Number of Servers	Percent
11.0.3	2,572	12.80%
12.5.3	2,390	11.89%
11.0.0	1,214	6.04%
12.5.2	1,196	5.95%
10.0.0	883	4.39%
10.1.2	874	4.35%
12.0.3	852	4.24%
10.1.1	689	3.43%
12.0.4	629	3.13%
9.6.1	539	2.68%
9.6.6	486	2.42%
10.1.0	457	2.27%
12.5.0	380	1.89%
12.5.1	372	1.85%
9.6.5	343	1.71%
9.5.2	327	1.63%
9.6.2	317	1.58%
10.0.5	317	1.58%
12.0.1	304	1.51%
9.5.1	285	1.42%
9.5.6	275	1.37%
10.0.2	275	1.37%
12.0.0	274	1.36%
9.6.4	261	1.30%
8.1.3	245	1.22%
10.0.4	226	1.12%
9.0.4	226	1.12%
Other	2,893	14.39%
IMail (8,537 servers)
Version	Number of Servers	Percent
8.22	1,550	18.16%
11.5	1,413	16.55%
8.15	576	6.75%
9.23	510	5.97%
11.03	471	5.52%
11.01	449	5.26%
8.05	352	4.12%
11.02	306	3.58%
10.02	275	3.22%
11.0	255	2.99%
9.10	245	2.87%
7.07	220	2.58%
7.15	195	2.28%
9.20	185	2.17%
6.06	159	1.86%
8.00	157	1.84%
10.01	127	1.49%
12.0.0.348	125	1.46%
9.21	104	1.22%
Other	863	10.11%
Lotus Domino (4,455 servers)
Version	Number of Servers	Percent
8.5.3	593	13.31%
8.5.2	434	9.74%
8.5.2FP2	331	7.43%
8.5.1	285	6.40%
7.0.2	233	5.23%
8.5.2FP3	205	4.60%
8.5	189	4.24%
8.5.2FP1	156	3.50%
7.0.3	134	3.01%
8.5.1FP5	110	2.47%
8.0.1	108	2.42%
7.0.1	99	2.22%
8.0.2	97	2.18%
6.5.1	91	2.04%
6.5.4	86	1.93%
7.0	75	1.68%
8.0	72	1.62%
6.5.3	68	1.53%
8.5.1FP3	68	1.53%
7.0.3FP1	60	1.35%
8.5.1FP4	57	1.28%
6.5	55	1.23%
6.5.5	52	1.17%
7.0.2FP2	49	1.10%
8.5.2FP4	45	1.01%
Other	703	15.78%
WinWebMail (3,604 servers)
Version	Number of Servers	Percent
3.8.1.3	791	21.95%
3.8.0.1	566	15.70%
3.7.6.1	455	12.62%
3.8.1.1	304	8.44%
3.7.3.1	300	8.32%
3.7.7.3	295	8.19%
3.8.1.5	270	7.49%
3.7.1.1	165	4.58%
3.7.5.1	120	3.33%
3.7.7.1	77	2.14%
3.6.3.1	69	1.91%
3.7.0.3	60	1.66%
3.7.0.5	59	1.64%
3.7.0.7	50	1.39%
Other	23	0.64%
CommuniGate Pro (3,122 servers)
Version	Number of Servers	Percent
5.1.16	222	7.11%
4.1.8	158	5.06%
5.4.3	145	4.64%
5.4.1	132	4.23%
5.4.2	113	3.62%
5.2.20	113	3.62%
5.3.13	111	3.56%
5.2.16	80	2.56%
4.2.10	78	2.50%
5.4.4	74	2.37%
5.1.12	67	2.15%
5.0.14	65	2.08%
5.4.0	62	1.99%
5.2.3	62	1.99%
5.3.12	62	1.99%
5.3.8	62	1.99%
5.2.19	60	1.92%
5.2.14	57	1.83%
5.3.9	47	1.51%
5.1.13	47	1.51%
5.3.10	46	1.47%
5.3.14	45	1.44%
5.4	45	1.44%
5.2.12	44	1.41%
5.2.8	42	1.35%
5.2.13	35	1.12%
5.1.14	35	1.12%
5.3.15	33	1.06%
5.3.5	33	1.06%
Other	947	30.33%
XMail (2,114 servers)
Version	Number of Servers	Percent
1.22	501	23.70%
1.27	437	20.67%
1.25	402	19.02%
1.26	264	12.49%
1.24	195	9.22%
1.21	81	3.83%
1.23	50	2.37%
1.20	40	1.89%
1.12	32	1.51%
1.17	32	1.51%
Other	80	3.78%
Kerio (1,956 servers)
Version	Number of Servers	Percent
6.7.3	285	14.57%
6.6.2	199	10.17%
6.7.0	176	9.00%
6.5.2	134	6.85%
6.5.0	130	6.65%
6.7.2	115	5.88%
6.4.1	109	5.57%
6.7.1	106	5.42%
6.3.1	88	4.50%
6.4.0	78	3.99%
6.5.1	75	3.83%
6.6.0	70	3.58%
6.6.1	61	3.12%
6.4.2	51	2.61%
6.3.0	31	1.58%
6.2.0	24	1.23%
6.0.10	23	1.18%
6.1.0	21	1.07%
6.2.2	20	1.02%
6.1.3	20	1.02%
Other	140	7.16%
Qmail Toaster (1,580 servers)
Version	Number of Servers	Percent
1.3	1,490	94.30%
1.2	60	3.80%
1.0	17	1.08%
Other	13	0.82%
Merak (1,463 servers)
Version	Number of Servers	Percent
8.0.3	593	40.53%
8.9.1	157	10.73%
8.5.0	111	7.59%
7.5.2	68	4.65%
7.6.4	62	4.24%
8.3.8	61	4.17%
7.4.5	56	3.83%
9.0.0	28	1.91%
7.4.2	23	1.57%
7.6.1	22	1.50%
8.9.0	19	1.30%
8.3.15	19	1.30%
7.2.0	18	1.23%
6.2.1	18	1.23%
7.0.1	17	1.16%
8.2.4	17	1.16%
Other	174	11.89%
SurgeSMTP (1,182 servers)
Version	Number of Servers	Percent
5.3h2-2	367	31.05%
5.2a-1	147	12.44%
3.9e-1	83	7.02%
4.2d4-4	80	6.77%
5.3h-1	40	3.38%
3.8k4-4	38	3.21%
4.0u4-4	38	3.21%
5.0e4-4	21	1.78%
4.2d2-2	21	1.78%
4.3g2-2	21	1.78%
3.8i3-3	20	1.69%
3.6f5-5	16	1.35%
5.0e3-3	14	1.18%
4.3e-1	13	1.10%
4.3g4-4	13	1.10%
3.9c-1	13	1.10%
5.1c2-2	13	1.10%
4.2a3-3	13	1.10%
3.9h-18	13	1.10%
Other	198	16.75%
ArGoSoft (884 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	209	23.64%
1.8 (1.8.9.5)	132	14.93%
1.8 (1.8.9.3)	110	12.44%
1.8 (1.8.9.1)	78	8.82%
1.8 (1.8.8.8)	65	7.35%
1.8 (1.8.8.7)	47	5.32%
1.8 (1.8.9.2)	37	4.19%
1.8 (1.8.9.4)	22	2.49%
1.8 (1.8.6.0)	21	2.38%
1.8 (1.8.8.9)	13	1.47%
1.8 (1.8.8.1)	13	1.47%
1.8 (1.8.9.0)	11	1.24%
1.8 (1.8.8.2)	11	1.24%
Other	115	13.01%
GroupWise (668 servers)
Version	Number of Servers	Percent
8.0.2	144	21.56%
7.0.3	137	20.51%
6.5.7	75	11.23%
7.0.2	47	7.04%
7.0.4	42	6.29%
8.0.1	42	6.29%
7.0.1	28	4.19%
6.5.4	27	4.04%
6.5.6	22	3.29%
6.5.1	19	2.84%
8.0.0	17	2.54%
6.0.4	17	2.54%
6.5.5	12	1.80%
7.0	7	1.05%
Other	32	4.79%
Trend Micro (410 servers)
Version	Number of Servers	Percent
5.7	172	41.95%
5.5	104	25.37%
5.18	62	15.12%
7.0	44	10.73%
7.1	17	4.15%
Other	11	2.68%
Gordano Messaging Suite (GMS) (375 servers)
Version	Number of Servers	Percent
Other	375	100.00%
Post.Office (331 servers)
Version	Number of Servers	Percent
3.5.3	55	16.62%
4.1.0.2	35	10.57%
4.0.1	27	8.16%
3.5.3J	17	5.14%
4.1.2.4	15	4.53%
4.1.1	12	3.63%
3.9.2.3	11	3.32%
3.1.2J	9	2.72%
4.1.0.4	9	2.72%
3.9.2	9	2.72%
3.1.2	8	2.42%
4.0.1.1	8	2.42%
4.2	8	2.42%
3.8.3	8	2.42%
4.1.0.3	8	2.42%
4.1.2.3	7	2.11%
3.8.7.4	7	2.11%
3.9.2.1	6	1.81%
3.6.2	6	1.81%
4.2.1	6	1.81%
4.0.0.2	5	1.51%
3.9.2.2	4	1.21%
4.1	4	1.21%
3.9.1.3	4	1.21%
4.1.2.2	4	1.21%
4.0.0.1	4	1.21%
3.5.2	4	1.21%
3.9.1	4	1.21%
Other	27	8.16%
MagicMail (324 servers)
Version	Number of Servers	Percent
Other	324	100.00%
Mirapoint (205 servers)
Version	Number of Servers	Percent
4.2.3-GA	20	9.76%
3.10.10a-GA	19	9.27%
3.8.4-GA	17	8.29%
3.10.9-GA	15	7.32%
4.1.10-GA	13	6.34%
3.10.5-GA	13	6.34%
3.8.3-GA	11	5.37%
4.1.9-GA	9	4.39%
3.10.8-GA	8	3.90%
4.3.3-GA	7	3.41%
4.1.8-GA	7	3.41%
4.1.3-GA	6	2.93%
3.10.7-GA	6	2.93%
4.1.4-GA	6	2.93%
3.8.5-GA	5	2.44%
3.8.6-GA	4	1.95%
3.10.4-GA	4	1.95%
3.8.2-GA	4	1.95%
3.8.7a	4	1.95%
4.2.4-GA	4	1.95%
3.10.3-GA	4	1.95%
4.1.5-GA	3	1.46%
Other	16	7.80%
VisNetic (161 servers)
Version	Number of Servers	Percent
9.3.2.0	48	29.81%
9.1.4.1	25	15.53%
8.5.0.8	10	6.21%
5.8.6.6	9	5.59%
8.0.3.1	6	3.73%
5.5.8.3	6	3.73%
5.0.2.3	6	3.73%
7.6.1.0	6	3.73%
8.0.3.0	5	3.11%
7.2.4.1	5	3.11%
8.0.3	5	3.11%
5.3.5.0	4	2.48%
9.1.4.0	4	2.48%
8.3.5.0	3	1.86%
5.0.2.1	2	1.24%
6.2.2.0	2	1.24%
8.3.0.1	2	1.24%
5.4.5.4	2	1.24%
Other	11	6.83%
InterScan VirusWall (133 servers)
Version	Number of Servers	Percent
Other	133	100.00%
NetIQ MailMarshal (57 servers)
Version	Number of Servers	Percent
6.0.3.8	43	75.44%
5.5.6.7	5	8.77%
6.1.3.15	3	5.26%
5.5.5.9	1	1.75%
5.5.4.17	1	1.75%
5.5.6.6	1	1.75%
5.5.6.5	1	1.75%
5.5.4.16	1	1.75%
5.5.5.6	1	1.75%
Other	0	0.00%
Interscan (53 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	10	18.87%
3.81-Build_1022	8	15.09%
3.55 (build 1029)	7	13.21%
3.8-Build_3013	4	7.55%
3.81-Build_1084	4	7.55%
3.53 (build 1493)	3	5.66%
3.55 (build 1020)	3	5.66%
3.52 (build 1375)	3	5.66%
3.53 (build 2017)	2	3.77%
3.53 (build 2011)	2	3.77%
3.53 (build 2013)	2	3.77%
3.5 (build 1294)	1	1.89%
3.51 (build 1337)	1	1.89%
3.6-Build_1246	1	1.89%
3.8-Build_3045	1	1.89%
3.8-Build_1080	1	1.89%
Other	0	0.00%
Mercury (51 servers)
Version	Number of Servers	Percent
1.48	25	49.02%
3.32	14	27.45%
3.01a	2	3.92%
1.47	2	3.92%
3.21c	2	3.92%
3.30	2	3.92%
3.21	1	1.96%
1.44	1	1.96%
3.31	1	1.96%
4.x	1	1.96%
Other	0	0.00%
WebSTAR V (37 servers)
Version	Number of Servers	Percent
5.4.1	17	45.95%
5.4.0	9	24.32%
5.3.4	5	13.51%
5.3.3	4	10.81%
5.3.2	2	5.41%
Other	0	0.00%
Neon Mail Server (37 servers)
Version	Number of Servers	Percent
3.0.7	10	27.03%
3.1.3	7	18.92%
3.0.9	5	13.51%
3.1.0	5	13.51%
3.1.4	4	10.81%
3.1.2	2	5.41%
3.1.1	1	2.70%
3.0.8	1	2.70%
3.1.5	1	2.70%
3.0.6	1	2.70%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	7	35.00%
7.3	6	30.00%
8.4	4	20.00%
6.1	1	5.00%
7.2	1	5.00%
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%
OpenSMTPD (17 servers)
Version	Number of Servers	Percent
Other	17	100.00%
WebSTAR (15 servers)
Version	Number of Servers	Percent
Other	15	100.00%
ModusMail (12 servers)
Version	Number of Servers	Percent
4.35.480.0	3	25.00%
4.35.477.0	3	25.00%
4.1.361.21	1	8.33%
3.2.315.0	1	8.33%
4.0.340.3	1	8.33%
4.3.459.0	1	8.33%
4.35.477.8	1	8.33%
3.1.302.0	1	8.33%
Other	0	0.00%
MAILsweeper (6 servers)
Version	Number of Servers	Percent
4.3.17.0	2	33.33%
4.3.19.0	2	33.33%
4.3.1.0	1	16.67%
4.3.20.0	1	16.67%
Other	0	0.00%