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Mail (MX) Server Survey
October 1st, 2016
Report Description |
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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 | 2,021,748 | 100.0% |
Number of Servers that didn't respond | 356,055 | 17.61% |
Server didn't open socket | 348,464 | 17.24% |
Server didn't provide banner | 7,591 | 0.38% |
Server provided banner | 1,665,693 | 82.39% |
Server banner identifies software in use | 1,007,548 | 49.84% |
As indicated by the above table, of the 2,021,748 servers
queried, only 1,007,548 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 |
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Server Type |
Number of Servers |
Percent |
Exim | 557,170 | 55.30% |
Postfix | 331,239 | 32.88% |
Sendmail | 56,011 | 5.56% |
MailEnable | 24,110 | 2.39% |
MDaemon | 13,745 | 1.36% |
Microsoft | 13,404 | 1.33% |
IMail | 2,463 | 0.24% |
CommuniGate Pro | 1,903 | 0.19% |
Lotus Domino | 1,276 | 0.13% |
WinWebMail | 1,252 | 0.12% |
XMail | 1,103 | 0.11% |
Qmail Toaster | 894 | 0.09% |
SurgeSMTP | 694 | 0.07% |
Kerio | 526 | 0.05% |
Merak | 330 | 0.03% |
MagicMail | 274 | 0.03% |
OpenSMTPD | 262 | 0.03% |
ArGoSoft | 243 | 0.02% |
Post.Office | 165 | 0.02% |
Gordano Messaging Suite (GMS) | 128 | 0.01% |
GroupWise | 123 | 0.01% |
Trend Micro | 83 | 0.01% |
InterScan VirusWall | 37 | 0.00% |
Mirapoint | 31 | 0.00% |
VisNetic | 28 | 0.00% |
OpenVMS | 9 | 0.00% |
ModusMail | 9 | 0.00% |
Mercury | 8 | 0.00% |
WebSTAR V | 7 | 0.00% |
Interscan | 6 | 0.00% |
Neon Mail Server | 6 | 0.00% |
MessageWall | 4 | 0.00% |
WebSTAR | 2 | 0.00% |
NetIQ MailMarshal | 2 | 0.00% |
MAILsweeper | 1 | 0.00% |
Detailed Breakdown of Revisions on a Per-Server Basis |
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Exim (557,170 servers) |
 |
|
Version |
Number of Servers |
Percent |
4.87 | 354,847 | 63.69% |
4.86 | 104,282 | 18.72% |
4.84 | 18,117 | 3.25% |
4.80 | 13,186 | 2.37% |
4.85 | 12,548 | 2.25% |
4.72 | 11,333 | 2.03% |
4.76 | 9,110 | 1.64% |
4.82 | 8,628 | 1.55% |
4.80.1 | 7,314 | 1.31% |
Other | 17,805 | 3.20% |
Postfix (331,239 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 331,239 | 100.00% |
Sendmail (56,011 servers) |
 |
|
Version |
Number of Servers |
Percent |
8.14.5 | 13,194 | 23.56% |
8.14.4 | 11,979 | 21.39% |
8.13.8 | 10,389 | 18.55% |
8.13.1 | 6,206 | 11.08% |
8.14.3 | 2,928 | 5.23% |
8.15.2 | 1,826 | 3.26% |
8.14.9 | 1,635 | 2.92% |
8.14.7 | 1,437 | 2.57% |
8.12.11.20060308 | 911 | 1.63% |
8.14.2 | 589 | 1.05% |
8.12.11.20060614 | 563 | 1.01% |
Other | 4,354 | 7.77% |
MailEnable (24,110 servers) |
 |
|
Version |
Number of Servers |
Percent |
9.00-- | 2,538 | 10.53% |
8.60-- | 1,710 | 7.09% |
8.53-- | 1,283 | 5.32% |
6.5-- | 1,161 | 4.82% |
1.986-- | 999 | 4.14% |
8.51-- | 871 | 3.61% |
8.04-- | 631 | 2.62% |
5.10-- | 515 | 2.14% |
8.60-8.60- | 512 | 2.12% |
8.50-- | 480 | 1.99% |
8.00-- | 420 | 1.74% |
4.26-- | 387 | 1.61% |
9.12-- | 364 | 1.51% |
6.0-- | 361 | 1.50% |
7.06-- | 345 | 1.43% |
7.07-- | 254 | 1.05% |
7.0-- | 244 | 1.01% |
Other | 11,035 | 45.77% |
MDaemon (13,745 servers) |
 |
|
Version |
Number of Servers |
Percent |
16.0.4 | 2,809 | 20.44% |
13.5.1 | 626 | 4.55% |
11.0.3 | 578 | 4.21% |
11.0.0 | 546 | 3.97% |
13.0.4 | 535 | 3.89% |
13.0.5 | 517 | 3.76% |
15.0.3 | 436 | 3.17% |
15.5.3 | 407 | 2.96% |
13.6.3 | 355 | 2.58% |
16.0.2 | 349 | 2.54% |
16.0.1 | 309 | 2.25% |
12.5.6 | 282 | 2.05% |
10.0.0 | 264 | 1.92% |
12.5.4 | 245 | 1.78% |
16.0.3 | 227 | 1.65% |
14.5.2 | 216 | 1.57% |
10.1.2 | 214 | 1.56% |
15.5.2 | 206 | 1.50% |
10.1.1 | 170 | 1.24% |
10.1.0 | 156 | 1.13% |
14.0.3 | 139 | 1.01% |
Other | 4,159 | 30.26% |
Microsoft (13,404 servers) |
 |
|
Version |
Number of Servers |
Percent |
6.0.3790.4675 | 8,787 | 65.56% |
7.5.7601.17514 | 1,347 | 10.05% |
6.0.3790.3959 | 1,029 | 7.68% |
8.5.9600.16384 | 646 | 4.82% |
6.0.3790.1830 | 282 | 2.10% |
7.0.6002.18264 | 269 | 2.01% |
8.0.9200.16384 | 220 | 1.64% |
5.0.2195.7381 | 156 | 1.16% |
5.0.2195.5329 | 155 | 1.16% |
Other | 513 | 3.83% |
IMail (2,463 servers) |
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|
Version |
Number of Servers |
Percent |
12.5.4.146 | 267 | 10.84% |
12.5.5.115 | 229 | 9.30% |
8.22 | 213 | 8.65% |
12.5.3.93 | 201 | 8.16% |
12.4.1.15 | 196 | 7.96% |
9.23 | 162 | 6.58% |
8.15 | 129 | 5.24% |
12.3.0.100 | 117 | 4.75% |
8.05 | 96 | 3.90% |
11.03 | 74 | 3.00% |
11.5 | 67 | 2.72% |
12.5.3.99 | 46 | 1.87% |
7.07 | 40 | 1.62% |
10.02 | 39 | 1.58% |
12.2.0.235 | 39 | 1.58% |
12.5.1.60 | 38 | 1.54% |
11.02 | 37 | 1.50% |
7.15 | 35 | 1.42% |
12.4.1.9 | 33 | 1.34% |
12.1.0.270 | 32 | 1.30% |
12.5.2.62 | 28 | 1.14% |
8.00 | 27 | 1.10% |
Other | 318 | 12.91% |
CommuniGate Pro (1,903 servers) |
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|
Version |
Number of Servers |
Percent |
5.1.16 | 190 | 9.98% |
6.1.11 | 168 | 8.83% |
6.1.10 | 101 | 5.31% |
6.0.11 | 77 | 4.05% |
5.2.20 | 69 | 3.63% |
6.0.9 | 68 | 3.57% |
5.4.11 | 63 | 3.31% |
6.1.8 | 55 | 2.89% |
6.1.2 | 47 | 2.47% |
6.1.7 | 45 | 2.36% |
5.3.13 | 43 | 2.26% |
6.1.5 | 40 | 2.10% |
5.0.14 | 38 | 2.00% |
5.2.3 | 36 | 1.89% |
6.1.9 | 35 | 1.84% |
5.3.15 | 35 | 1.84% |
6.0.10 | 34 | 1.79% |
4.1.8 | 29 | 1.52% |
6.1.4 | 26 | 1.37% |
6.1.6 | 25 | 1.31% |
5.2.16 | 24 | 1.26% |
6.0.7 | 21 | 1.10% |
5.1.12 | 21 | 1.10% |
Other | 613 | 32.21% |
Lotus Domino (1,276 servers) |
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|
Version |
Number of Servers |
Percent |
8.5.3FP6 | 219 | 17.16% |
8.5.3 | 182 | 14.26% |
8.5.2 | 61 | 4.78% |
8.5.1 | 49 | 3.84% |
7.0.2 | 44 | 3.45% |
8.5 | 41 | 3.21% |
8.5.3FP4 | 36 | 2.82% |
8.5.2FP4 | 35 | 2.74% |
8.5.3FP2 | 34 | 2.66% |
8.5.2FP3 | 33 | 2.59% |
8.5.3FP3 | 33 | 2.59% |
8.5.3FP1 | 27 | 2.12% |
8.5.3FP5 | 25 | 1.96% |
7.0.3 | 25 | 1.96% |
8.5.2FP2 | 23 | 1.80% |
7.0.1 | 23 | 1.80% |
8.5.1FP5 | 22 | 1.72% |
8.0.1 | 22 | 1.72% |
8.0 | 21 | 1.65% |
7.0 | 20 | 1.57% |
6.5.1 | 16 | 1.25% |
6.5.4 | 14 | 1.10% |
8.5.2FP1 | 14 | 1.10% |
8.0.2 | 14 | 1.10% |
6.5 | 13 | 1.02% |
7.0.4 | 13 | 1.02% |
Other | 217 | 17.01% |
WinWebMail (1,252 servers) |
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|
Version |
Number of Servers |
Percent |
3.9.0.7 | 313 | 25.00% |
3.8.1.3 | 196 | 15.65% |
3.7.6.1 | 88 | 7.03% |
3.9.0.1 | 86 | 6.87% |
3.8.0.1 | 82 | 6.55% |
3.8.1.5 | 65 | 5.19% |
3.7.3.1 | 59 | 4.71% |
3.8.5.1 | 57 | 4.55% |
3.8.1.1 | 54 | 4.31% |
3.7.7.3 | 46 | 3.67% |
3.8.6.1 | 43 | 3.43% |
3.8.2.1 | 29 | 2.32% |
3.7.1.1 | 29 | 2.32% |
3.8.3.1 | 21 | 1.68% |
Other | 84 | 6.71% |
XMail (1,103 servers) |
 |
|
Version |
Number of Servers |
Percent |
1.27 | 455 | 41.25% |
1.22 | 328 | 29.74% |
1.26 | 92 | 8.34% |
1.25 | 90 | 8.16% |
1.24 | 50 | 4.53% |
1.21 | 29 | 2.63% |
1.23 | 14 | 1.27% |
1.20 | 12 | 1.09% |
Other | 33 | 2.99% |
Qmail Toaster (894 servers) |
 |
|
Version |
Number of Servers |
Percent |
1.3 | 823 | 92.06% |
1.03 | 24 | 2.68% |
1.2 | 15 | 1.68% |
1.03.5 | 10 | 1.12% |
Other | 22 | 2.46% |
SurgeSMTP (694 servers) |
 |
|
Version |
Number of Servers |
Percent |
7.1e-1 | 235 | 33.86% |
6.5a2-2 | 63 | 9.08% |
6.9c-1 | 41 | 5.91% |
6.7c-1 | 35 | 5.04% |
7.0c2-2 | 34 | 4.90% |
6.5a-1 | 29 | 4.18% |
3.9e-1 | 19 | 2.74% |
7.2a-1 | 19 | 2.74% |
5.2a-1 | 17 | 2.45% |
6.3c2-2 | 16 | 2.31% |
6.1c-1 | 14 | 2.02% |
6.4a-1 | 14 | 2.02% |
3.8k4-4 | 10 | 1.44% |
7.1f-32 | 8 | 1.15% |
5.3h2-2 | 8 | 1.15% |
4.0u4-4 | 8 | 1.15% |
7.1f-9 | 8 | 1.15% |
Other | 116 | 16.71% |
Kerio (526 servers) |
 |
|
Version |
Number of Servers |
Percent |
6.7.3 | 110 | 20.91% |
6.7.0 | 51 | 9.70% |
6.6.2 | 45 | 8.56% |
6.5.2 | 42 | 7.98% |
6.5.0 | 37 | 7.03% |
6.7.2 | 30 | 5.70% |
6.4.1 | 25 | 4.75% |
6.3.1 | 24 | 4.56% |
6.6.1 | 23 | 4.37% |
6.7.1 | 23 | 4.37% |
6.5.1 | 18 | 3.42% |
6.3.0 | 17 | 3.23% |
6.4.0 | 14 | 2.66% |
6.6.0 | 9 | 1.71% |
6.1.3 | 9 | 1.71% |
6.4.2 | 7 | 1.33% |
6.2.0 | 6 | 1.14% |
Other | 36 | 6.84% |
Merak (330 servers) |
 |
|
Version |
Number of Servers |
Percent |
8.0.3 | 100 | 30.30% |
8.9.1 | 49 | 14.85% |
8.5.0 | 26 | 7.88% |
7.5.2 | 19 | 5.76% |
7.4.5 | 18 | 5.45% |
8.3.8 | 16 | 4.85% |
7.6.4 | 14 | 4.24% |
7.6.1 | 11 | 3.33% |
8.3.15 | 9 | 2.73% |
7.2.0 | 7 | 2.12% |
7.4.2 | 6 | 1.82% |
7.0.1 | 6 | 1.82% |
8.9.0 | 5 | 1.52% |
6.1.0 | 4 | 1.21% |
6.0.8 | 4 | 1.21% |
Other | 36 | 10.91% |
MagicMail (274 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 274 | 100.00% |
OpenSMTPD (262 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 262 | 100.00% |
ArGoSoft (243 servers) |
 |
|
Version |
Number of Servers |
Percent |
1.8 (1.8.9.6) | 78 | 32.10% |
1.8 (1.8.9.5) | 30 | 12.35% |
1.8 (1.8.9.3) | 27 | 11.11% |
1.8 (1.8.9.1) | 24 | 9.88% |
1.8 (1.8.8.8) | 12 | 4.94% |
1.8 (1.8.9.2) | 7 | 2.88% |
1.8 (1.8.8.7) | 7 | 2.88% |
1.8 (1.8.7.3) | 6 | 2.47% |
1.8 (1.8.6.0) | 5 | 2.06% |
1.8 (1.8.8.9) | 4 | 1.65% |
1.8 (1.8.7.6) | 3 | 1.23% |
1.8 (1.8.9.0) | 3 | 1.23% |
1.8 (1.8.8.2) | 3 | 1.23% |
1.8 (1.8.9.4) | 3 | 1.23% |
1.8 (1.8.8.4) | 3 | 1.23% |
Other | 28 | 11.52% |
Post.Office (165 servers) |
 |
|
Version |
Number of Servers |
Percent |
4.2.2 | 36 | 21.82% |
4.3 | 24 | 14.55% |
3.5.3 | 23 | 13.94% |
4.1.2.4 | 20 | 12.12% |
4.2.1.3 | 8 | 4.85% |
3.9.2.3 | 6 | 3.64% |
4.0.1 | 4 | 2.42% |
4.1.1 | 4 | 2.42% |
3.1.2 | 4 | 2.42% |
3.5.3J | 3 | 1.82% |
3.8.7.4 | 3 | 1.82% |
3.5.1 | 3 | 1.82% |
4.2.1.1 | 3 | 1.82% |
4.2 | 3 | 1.82% |
3.5.4 | 2 | 1.21% |
4.1.2.3 | 2 | 1.21% |
4.1.0.3 | 2 | 1.21% |
4.1.0.2 | 2 | 1.21% |
3.9.2 | 2 | 1.21% |
Other | 11 | 6.67% |
Gordano Messaging Suite (GMS) (128 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 128 | 100.00% |
GroupWise (123 servers) |
 |
|
Version |
Number of Servers |
Percent |
14.2.1 | 27 | 21.95% |
14.2.0 | 16 | 13.01% |
14.0.1 | 9 | 7.32% |
14.0.2 | 8 | 6.50% |
14.0.0 | 8 | 6.50% |
6.5.7 | 7 | 5.69% |
8.0.3 | 7 | 5.69% |
7.0.3 | 6 | 4.88% |
7.0.4 | 5 | 4.07% |
8.0.2 | 4 | 3.25% |
7.0.2 | 3 | 2.44% |
12.0.4 | 2 | 1.63% |
6.0.3 | 2 | 1.63% |
12.0.1 | 2 | 1.63% |
7.0.1 | 2 | 1.63% |
6.5.4 | 2 | 1.63% |
12.0.3 | 2 | 1.63% |
6.0.2 | 2 | 1.63% |
12.0.2 | 2 | 1.63% |
Other | 7 | 5.69% |
Trend Micro (83 servers) |
 |
|
Version |
Number of Servers |
Percent |
5.7 | 30 | 36.14% |
5.18 | 16 | 19.28% |
5.5 | 14 | 16.87% |
7.0 | 7 | 8.43% |
7.5 | 4 | 4.82% |
7.1 | 3 | 3.61% |
8.5 | 3 | 3.61% |
3.53 | 2 | 2.41% |
7.5ready | 1 | 1.20% |
8.5.2 | 1 | 1.20% |
9.0 | 1 | 1.20% |
8 | 1 | 1.20% |
Other | 0 | 0.00% |
InterScan VirusWall (37 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 37 | 100.00% |
Mirapoint (31 servers) |
 |
|
Version |
Number of Servers |
Percent |
4.4.3-GA | 5 | 16.13% |
4.3.5-GA | 4 | 12.90% |
4.4.5-GA | 4 | 12.90% |
4.4.2a-FCS | 3 | 9.68% |
3.10.10a-GA | 2 | 6.45% |
4.4.4-GA | 2 | 6.45% |
4.3.6-GA | 2 | 6.45% |
4.4.7-GA | 2 | 6.45% |
4.1.10-GA | 2 | 6.45% |
4.1.9-GA | 1 | 3.23% |
4.4.5a-GA | 1 | 3.23% |
3.7.5a-GA | 1 | 3.23% |
4.3.3-GA | 1 | 3.23% |
4.4.6-GA | 1 | 3.23% |
Other | 0 | 0.00% |
VisNetic (28 servers) |
 |
|
Version |
Number of Servers |
Percent |
9.3.2.0 | 9 | 32.14% |
9.1.4.1 | 3 | 10.71% |
5.0.2.3 | 2 | 7.14% |
6.2.2.0 | 2 | 7.14% |
8.0.3 | 1 | 3.57% |
8.3.0.1 | 1 | 3.57% |
5.8.6.6 | 1 | 3.57% |
8.5.0.5 | 1 | 3.57% |
5.5.8.3 | 1 | 3.57% |
8.0.3.1 | 1 | 3.57% |
9.1.4.0 | 1 | 3.57% |
7.6.1.0 | 1 | 3.57% |
5.0.2.0 | 1 | 3.57% |
9.1.4.1 provided by Techfount Systems Pte Ltd | 1 | 3.57% |
8.5.0.8 | 1 | 3.57% |
7.2.4.1 | 1 | 3.57% |
Other | 0 | 0.00% |
OpenVMS (9 servers) |
 |
|
Version |
Number of Servers |
Percent |
8.4 | 4 | 44.44% |
8.3 | 3 | 33.33% |
7.3 | 2 | 22.22% |
Other | 0 | 0.00% |
ModusMail (9 servers) |
 |
|
Version |
Number of Servers |
Percent |
4.35.477.0 | 5 | 55.56% |
4.1.361.21 | 2 | 22.22% |
3.2.315.0 | 1 | 11.11% |
4.35.477.8 | 1 | 11.11% |
Other | 0 | 0.00% |
Mercury (8 servers) |
 |
|
Version |
Number of Servers |
Percent |
3.32 | 4 | 50.00% |
1.48 | 2 | 25.00% |
3.21 | 1 | 12.50% |
4.x | 1 | 12.50% |
Other | 0 | 0.00% |
WebSTAR V (7 servers) |
 |
|
Version |
Number of Servers |
Percent |
5.4.1 | 5 | 71.43% |
5.3.2 | 1 | 14.29% |
5.3.4 | 1 | 14.29% |
Other | 0 | 0.00% |
Interscan (6 servers) |
 |
|
Version |
Number of Servers |
Percent |
3.81-Build_1084 | 1 | 16.67% |
3.5 (build 1294) | 1 | 16.67% |
3.8-Build_3013 | 1 | 16.67% |
3.8-Build_1080 | 1 | 16.67% |
3.81-Build_1022 | 1 | 16.67% |
3.55 (build 1016) | 1 | 16.67% |
Other | 0 | 0.00% |
Neon Mail Server (6 servers) |
 |
|
Version |
Number of Servers |
Percent |
3.1.2 | 2 | 33.33% |
3.1.0 | 2 | 33.33% |
3.1.4 | 1 | 16.67% |
3.0.7 | 1 | 16.67% |
Other | 0 | 0.00% |
MessageWall (4 servers) |
 |
|
Version |
Number of Servers |
Percent |
1.0.8 | 4 | 100.00% |
Other | 0 | 0.00% |
WebSTAR (2 servers) |
 |
|
Version |
Number of Servers |
Percent |
Other | 2 | 100.00% |
NetIQ MailMarshal (2 servers) |
 |
|
Version |
Number of Servers |
Percent |
6.0.3.8 | 1 | 50.00% |
5.5.6.7 | 1 | 50.00% |
Other | 0 | 0.00% |
MAILsweeper (1 servers) |
 |
|
Version |
Number of Servers |
Percent |
4.3.20.0 | 1 | 100.00% |
Other | 0 | 0.00% |