You are viewing an outdated report. The latest version of this report was published on April 1st, 2025
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Mail (MX) Server Survey
June 1st, 2017
| 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 | 2,031,277 | 100.0% |
| Number of Servers that didn't respond | 365,197 | 17.98% |
| Server didn't open socket | 357,504 | 17.60% |
| Server didn't provide banner | 7,693 | 0.38% |
| Server provided banner | 1,666,080 | 82.02% |
| Server banner identifies software in use | 1,018,807 | 50.16% |
As indicated by the above table, of the 2,031,277 servers
queried, only 1,018,807 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 | 573,206 | 56.26% |
| Postfix | 339,428 | 33.32% |
| Sendmail | 49,421 | 4.85% |
| MailEnable | 23,291 | 2.29% |
| MDaemon | 12,344 | 1.21% |
| Microsoft | 10,382 | 1.02% |
| IMail | 2,144 | 0.21% |
| CommuniGate Pro | 1,804 | 0.18% |
| WinWebMail | 1,077 | 0.11% |
| XMail | 1,059 | 0.10% |
| Lotus Domino | 1,052 | 0.10% |
| Qmail Toaster | 823 | 0.08% |
| SurgeSMTP | 662 | 0.06% |
| Kerio | 451 | 0.04% |
| OpenSMTPD | 315 | 0.03% |
| Merak | 312 | 0.03% |
| MagicMail | 259 | 0.03% |
| ArGoSoft | 200 | 0.02% |
| Post.Office | 165 | 0.02% |
| Gordano Messaging Suite (GMS) | 113 | 0.01% |
| GroupWise | 100 | 0.01% |
| Trend Micro | 68 | 0.01% |
| VisNetic | 30 | 0.00% |
| InterScan VirusWall | 27 | 0.00% |
| Mirapoint | 18 | 0.00% |
| OpenVMS | 16 | 0.00% |
| Mercury | 9 | 0.00% |
| ModusMail | 7 | 0.00% |
| WebSTAR V | 7 | 0.00% |
| Interscan | 6 | 0.00% |
| MessageWall | 5 | 0.00% |
| Neon Mail Server | 4 | 0.00% |
| WebSTAR | 1 | 0.00% |
| MAILsweeper | 1 | 0.00% |
| Detailed Breakdown of Revisions on a Per-Server Basis |
|
| Exim (573,206 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 4.89 | 256,459 | 44.74% |
| 4.87 | 184,163 | 32.13% |
| 4.88 | 41,939 | 7.32% |
| 4.84 | 19,386 | 3.38% |
| 4.80 | 11,303 | 1.97% |
| 4.86 | 10,510 | 1.83% |
| 4.72 | 8,078 | 1.41% |
| 4.85 | 8,038 | 1.40% |
| 4.76 | 7,493 | 1.31% |
| 4.82 | 7,257 | 1.27% |
| Other | 18,580 | 3.24% |
| Postfix (339,428 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 339,428 | 100.00% |
| Sendmail (49,421 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 8.14.5 | 11,830 | 23.94% |
| 8.14.4 | 11,577 | 23.43% |
| 8.13.8 | 8,373 | 16.94% |
| 8.13.1 | 5,079 | 10.28% |
| 8.15.2 | 2,448 | 4.95% |
| 8.14.3 | 2,416 | 4.89% |
| 8.14.7 | 1,550 | 3.14% |
| 8.14.9 | 1,442 | 2.92% |
| 8.12.11.20060308 | 699 | 1.41% |
| 8.14.2 | 495 | 1.00% |
| Other | 3,512 | 7.11% |
| MailEnable (23,291 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 9.00-- | 3,219 | 13.82% |
| 8.60-- | 1,300 | 5.58% |
| 8.53-- | 1,105 | 4.74% |
| 6.5-- | 973 | 4.18% |
| 8.51-- | 757 | 3.25% |
| 1.986-- | 697 | 2.99% |
| 9.16-- | 656 | 2.82% |
| 8.04-- | 549 | 2.36% |
| 8.60-8.60- | 445 | 1.91% |
| 5.10-- | 386 | 1.66% |
| 8.50-- | 372 | 1.60% |
| 9.53-- | 369 | 1.58% |
| 8.00-- | 344 | 1.48% |
| 4.26-- | 269 | 1.15% |
| 6.0-- | 266 | 1.14% |
| 7.06-- | 266 | 1.14% |
| 9.50-- | 236 | 1.01% |
| Other | 11,082 | 47.58% |
| MDaemon (12,344 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 16.5.2 | 1,567 | 12.69% |
| 17.0.0 | 1,047 | 8.48% |
| 13.5.1 | 572 | 4.63% |
| 16.0.4 | 566 | 4.59% |
| 11.0.0 | 513 | 4.16% |
| 11.0.3 | 490 | 3.97% |
| 13.0.4 | 478 | 3.87% |
| 13.0.5 | 441 | 3.57% |
| 16.5.1 | 429 | 3.48% |
| 13.6.3 | 425 | 3.44% |
| 15.0.3 | 273 | 2.21% |
| 12.5.6 | 266 | 2.15% |
| 12.5.4 | 239 | 1.94% |
| 10.0.0 | 205 | 1.66% |
| 14.5.2 | 197 | 1.60% |
| 15.5.3 | 195 | 1.58% |
| 10.1.2 | 178 | 1.44% |
| 16.0.1 | 165 | 1.34% |
| 16.5.0 | 147 | 1.19% |
| 10.1.1 | 128 | 1.04% |
| 13.0.2 | 125 | 1.01% |
| Other | 3,698 | 29.96% |
| Microsoft (10,382 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 6.0.3790.4675 | 6,386 | 61.51% |
| 7.5.7601.17514 | 1,166 | 11.23% |
| 6.0.3790.3959 | 771 | 7.43% |
| 8.5.9600.16384 | 752 | 7.24% |
| 6.0.3790.1830 | 217 | 2.09% |
| 8.0.9200.16384 | 192 | 1.85% |
| 5.0.2195.5329 | 173 | 1.67% |
| 7.0.6002.18264 | 162 | 1.56% |
| 5.0.2195.7381 | 114 | 1.10% |
| Other | 449 | 4.32% |
| IMail (2,144 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 12.5.5.115 | 409 | 19.08% |
| 12.4.1.15 | 185 | 8.63% |
| 12.5.3.93 | 160 | 7.46% |
| 8.22 | 159 | 7.42% |
| 12.5.4.146 | 151 | 7.04% |
| 9.23 | 138 | 6.44% |
| 8.15 | 110 | 5.13% |
| 12.3.0.100 | 98 | 4.57% |
| 8.05 | 71 | 3.31% |
| 11.03 | 60 | 2.80% |
| 11.5 | 54 | 2.52% |
| 7.07 | 32 | 1.49% |
| 12.5.1.60 | 32 | 1.49% |
| 10.02 | 29 | 1.35% |
| 7.15 | 29 | 1.35% |
| 11.02 | 28 | 1.31% |
| 12.5.5.117 | 26 | 1.21% |
| 12.5.2.62 | 22 | 1.03% |
| Other | 351 | 16.37% |
| CommuniGate Pro (1,804 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 5.1.16 | 166 | 9.20% |
| 6.1.16 | 108 | 5.99% |
| 6.1.11 | 88 | 4.88% |
| 6.1.10 | 69 | 3.82% |
| 6.0.11 | 64 | 3.55% |
| 5.4.11 | 63 | 3.49% |
| 5.2.20 | 61 | 3.38% |
| 6.1.15 | 60 | 3.33% |
| 6.1.13 | 58 | 3.22% |
| 6.1.14 | 52 | 2.88% |
| 6.0.9 | 48 | 2.66% |
| 6.1.12 | 46 | 2.55% |
| 5.3.13 | 40 | 2.22% |
| 6.1.2 | 39 | 2.16% |
| 5.2.3 | 33 | 1.83% |
| 5.0.14 | 33 | 1.83% |
| 6.1.8 | 30 | 1.66% |
| 6.1.5 | 28 | 1.55% |
| 4.1.8 | 28 | 1.55% |
| 6.2 | 27 | 1.50% |
| 5.4.4 | 24 | 1.33% |
| 6.0.10 | 24 | 1.33% |
| 5.3.15 | 19 | 1.05% |
| Other | 596 | 33.04% |
| WinWebMail (1,077 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 3.9.0.7 | 265 | 24.61% |
| 3.8.1.3 | 176 | 16.34% |
| 3.9.0.1 | 77 | 7.15% |
| 3.7.6.1 | 71 | 6.59% |
| 3.8.0.1 | 66 | 6.13% |
| 3.8.1.5 | 48 | 4.46% |
| 3.9.2.1 | 42 | 3.90% |
| 3.8.1.1 | 41 | 3.81% |
| 3.7.3.1 | 40 | 3.71% |
| 3.8.5.1 | 37 | 3.44% |
| 3.8.6.1 | 36 | 3.34% |
| 3.7.7.3 | 33 | 3.06% |
| 3.7.1.1 | 22 | 2.04% |
| 3.8.2.1 | 21 | 1.95% |
| 3.8.3.1 | 16 | 1.49% |
| 3.7.5.1 | 13 | 1.21% |
| 3.7.0.5 | 11 | 1.02% |
| Other | 62 | 5.76% |
| XMail (1,059 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 1.27 | 448 | 42.30% |
| 1.22 | 333 | 31.44% |
| 1.25 | 85 | 8.03% |
| 1.26 | 74 | 6.99% |
| 1.24 | 47 | 4.44% |
| 1.21 | 22 | 2.08% |
| 1.23 | 15 | 1.42% |
| Other | 35 | 3.31% |
| Lotus Domino (1,052 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 8.5.3FP6 | 196 | 18.63% |
| 8.5.3 | 142 | 13.50% |
| 8.5.2 | 51 | 4.85% |
| 7.0.2 | 40 | 3.80% |
| 8.5 | 37 | 3.52% |
| 8.5.1 | 36 | 3.42% |
| 8.5.3FP4 | 32 | 3.04% |
| 8.5.3FP2 | 28 | 2.66% |
| 8.5.2FP4 | 27 | 2.57% |
| 8.5.3FP1 | 26 | 2.47% |
| 8.5.2FP3 | 25 | 2.38% |
| 7.0.3 | 25 | 2.38% |
| 8.5.3FP3 | 23 | 2.19% |
| 8.0.1 | 22 | 2.09% |
| 8.5.3FP5 | 21 | 2.00% |
| 8.5.2FP2 | 18 | 1.71% |
| 8.0 | 18 | 1.71% |
| 8.5.1FP5 | 15 | 1.43% |
| 7.0.4 | 14 | 1.33% |
| 7.0.1 | 14 | 1.33% |
| 6.5.1 | 14 | 1.33% |
| 7.0 | 13 | 1.24% |
| 7.0.3FP1 | 13 | 1.24% |
| 6.5.4 | 12 | 1.14% |
| Other | 190 | 18.06% |
| Qmail Toaster (823 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 1.3 | 718 | 87.24% |
| 1.03 | 60 | 7.29% |
| 1.2 | 14 | 1.70% |
| 1.03.5 | 12 | 1.46% |
| 1.03.6 | 9 | 1.09% |
| Other | 10 | 1.22% |
| SurgeSMTP (662 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 7.2i-1 | 130 | 19.64% |
| 7.1e-1 | 103 | 15.56% |
| 7.2a-1 | 43 | 6.50% |
| 6.5a2-2 | 43 | 6.50% |
| 7.2e-2 | 43 | 6.50% |
| 6.9c-1 | 36 | 5.44% |
| 6.7c-1 | 27 | 4.08% |
| 6.5a-1 | 24 | 3.63% |
| 7.0c2-2 | 19 | 2.87% |
| 3.9e-1 | 18 | 2.72% |
| 5.2a-1 | 15 | 2.27% |
| 6.3c2-2 | 11 | 1.66% |
| 4.0u4-4 | 10 | 1.51% |
| 6.1c-1 | 9 | 1.36% |
| 5.3h2-2 | 9 | 1.36% |
| 6.4a-1 | 9 | 1.36% |
| 3.8k4-4 | 8 | 1.21% |
| Other | 105 | 15.86% |
| Kerio (451 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 6.7.3 | 101 | 22.39% |
| 6.7.0 | 50 | 11.09% |
| 6.5.2 | 45 | 9.98% |
| 6.6.2 | 39 | 8.65% |
| 6.7.2 | 30 | 6.65% |
| 6.5.0 | 29 | 6.43% |
| 6.7.1 | 19 | 4.21% |
| 6.4.1 | 17 | 3.77% |
| 6.6.1 | 17 | 3.77% |
| 6.3.1 | 16 | 3.55% |
| 6.5.1 | 13 | 2.88% |
| 6.4.0 | 12 | 2.66% |
| 6.3.0 | 11 | 2.44% |
| 6.6.0 | 8 | 1.77% |
| 6.1.3 | 8 | 1.77% |
| 6.4.2 | 5 | 1.11% |
| 6.2.0 | 5 | 1.11% |
| Other | 26 | 5.76% |
| OpenSMTPD (315 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 315 | 100.00% |
| Merak (312 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 8.0.3 | 88 | 28.21% |
| 8.9.1 | 50 | 16.03% |
| 8.5.0 | 27 | 8.65% |
| 7.4.5 | 19 | 6.09% |
| 7.5.2 | 16 | 5.13% |
| 8.3.8 | 15 | 4.81% |
| 7.6.4 | 14 | 4.49% |
| 7.6.1 | 12 | 3.85% |
| 7.4.2 | 7 | 2.24% |
| 8.3.15 | 6 | 1.92% |
| 7.0.1 | 5 | 1.60% |
| 6.1.0 | 4 | 1.28% |
| 9.0.3 | 4 | 1.28% |
| 7.2.0 | 4 | 1.28% |
| Other | 41 | 13.14% |
| MagicMail (259 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 259 | 100.00% |
| ArGoSoft (200 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 1.8 (1.8.9.6) | 70 | 35.00% |
| 1.8 (1.8.9.5) | 26 | 13.00% |
| 1.8 (1.8.9.3) | 20 | 10.00% |
| 1.8 (1.8.9.1) | 20 | 10.00% |
| 1.8 (1.8.8.7) | 8 | 4.00% |
| 1.8 (1.8.7.3) | 6 | 3.00% |
| 1.8 (1.8.8.8) | 6 | 3.00% |
| 1.8 (1.8.6.0) | 6 | 3.00% |
| 1.8 (1.8.9.2) | 5 | 2.50% |
| 1.8 (1.8.9.4) | 4 | 2.00% |
| 1.8 (1.8.8.9) | 4 | 2.00% |
| 1.8 (1.8.8.4) | 2 | 1.00% |
| 1.8 (1.8.5.8) | 2 | 1.00% |
| 1.8 (1.8.2.1) | 2 | 1.00% |
| 1.8 (1.8.5.9) | 2 | 1.00% |
| Other | 17 | 8.50% |
| Post.Office (165 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 4.2.2 | 35 | 21.21% |
| 4.3 | 31 | 18.79% |
| 4.1.2.4 | 20 | 12.12% |
| 3.5.3 | 17 | 10.30% |
| 4.2.1.3 | 9 | 5.45% |
| 3.9.2.3 | 5 | 3.03% |
| 4.2.1.1 | 5 | 3.03% |
| 4.0.1 | 4 | 2.42% |
| 4.1.1 | 4 | 2.42% |
| 3.1.2 | 4 | 2.42% |
| 3.9.2 | 3 | 1.82% |
| 3.5.1 | 3 | 1.82% |
| 3.5.4 | 2 | 1.21% |
| 4.1.0.3 | 2 | 1.21% |
| 4.1.2.3 | 2 | 1.21% |
| 3.8.7.4 | 2 | 1.21% |
| 3.9.1.3 | 2 | 1.21% |
| 3.5.3J | 2 | 1.21% |
| 4.2 | 2 | 1.21% |
| Other | 11 | 6.67% |
| Gordano Messaging Suite (GMS) (113 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 113 | 100.00% |
| GroupWise (100 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 14.2.1 | 23 | 23.00% |
| 14.2.0 | 11 | 11.00% |
| 14.2.2 | 10 | 10.00% |
| 6.5.7 | 7 | 7.00% |
| 7.0.3 | 7 | 7.00% |
| 14.0.1 | 7 | 7.00% |
| 14.0.0 | 5 | 5.00% |
| 14.0.2 | 4 | 4.00% |
| 7.0.2 | 3 | 3.00% |
| 8.0.3 | 3 | 3.00% |
| 7.0.4 | 3 | 3.00% |
| 12.0.4 | 2 | 2.00% |
| 12.0.1 | 2 | 2.00% |
| 8.0.2 | 2 | 2.00% |
| 6.0.4 | 2 | 2.00% |
| 6.0.3 | 1 | 1.00% |
| 7.0.1 | 1 | 1.00% |
| 8.0.0 | 1 | 1.00% |
| 8.0.1 | 1 | 1.00% |
| 6.5.2 | 1 | 1.00% |
| 6.0.2 | 1 | 1.00% |
| 12.0.2 | 1 | 1.00% |
| 6.5.4 | 1 | 1.00% |
| 6.5.5 | 1 | 1.00% |
| Other | 0 | 0.00% |
| Trend Micro (68 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 5.7 | 22 | 32.35% |
| 5.18 | 13 | 19.12% |
| 5.5 | 12 | 17.65% |
| 7.0 | 8 | 11.76% |
| 7.5 | 5 | 7.35% |
| 7.1 | 2 | 2.94% |
| 3.53 | 2 | 2.94% |
| 8.5 | 1 | 1.47% |
| 7.5ready | 1 | 1.47% |
| 9.0 | 1 | 1.47% |
| 8 | 1 | 1.47% |
| Other | 0 | 0.00% |
| VisNetic (30 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 9.3.2.0 | 10 | 33.33% |
| 5.8.6.6 | 3 | 10.00% |
| 5.0.2.3 | 2 | 6.67% |
| 6.2.2.0 | 2 | 6.67% |
| 5.5.8.3 | 2 | 6.67% |
| 5.3.5.0 | 2 | 6.67% |
| 8.0.3 | 1 | 3.33% |
| 9.1.4.0 | 1 | 3.33% |
| 8.5.0.5 | 1 | 3.33% |
| 7.6.1.0 | 1 | 3.33% |
| 9.1.4.1 | 1 | 3.33% |
| 8.0.3.1 | 1 | 3.33% |
| 5.0.2.0 | 1 | 3.33% |
| 9.1.4.1 provided by Techfount Systems Pte Ltd | 1 | 3.33% |
| 8.5.0.8 | 1 | 3.33% |
| Other | 0 | 0.00% |
| InterScan VirusWall (27 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 27 | 100.00% |
| Mirapoint (18 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 4.4.3-GA | 4 | 22.22% |
| 4.4.2a-FCS | 3 | 16.67% |
| 4.3.5-GA | 3 | 16.67% |
| 4.4.7-GA | 2 | 11.11% |
| 4.1.9-GA | 1 | 5.56% |
| 4.4.4-GA | 1 | 5.56% |
| 4.3.6-GA | 1 | 5.56% |
| 3.10.10a-GA | 1 | 5.56% |
| 4.4.5-GA | 1 | 5.56% |
| 4.4.6-GA | 1 | 5.56% |
| Other | 0 | 0.00% |
| OpenVMS (16 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 8.4 | 7 | 43.75% |
| 7.3 | 5 | 31.25% |
| 8.3 | 3 | 18.75% |
| 8.2 | 1 | 6.25% |
| Other | 0 | 0.00% |
| Mercury (9 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 3.32 | 4 | 44.44% |
| 1.48 | 3 | 33.33% |
| 3.21 | 1 | 11.11% |
| 4.x | 1 | 11.11% |
| Other | 0 | 0.00% |
| ModusMail (7 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 4.35.477.0 | 5 | 71.43% |
| 4.1.361.21 | 1 | 14.29% |
| 4.35.477.8 | 1 | 14.29% |
| Other | 0 | 0.00% |
| WebSTAR V (7 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 5.4.1 | 4 | 57.14% |
| 5.4.0 | 1 | 14.29% |
| 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_1022 | 2 | 33.33% |
| 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% |
| Other | 0 | 0.00% |
| MessageWall (5 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 1.0.8 | 5 | 100.00% |
| Other | 0 | 0.00% |
| Neon Mail Server (4 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 3.1.0 | 2 | 50.00% |
| 3.1.3 | 1 | 25.00% |
| 3.0.7 | 1 | 25.00% |
| Other | 0 | 0.00% |
| WebSTAR (1 servers) |
|
|
| Version |
Number of Servers |
Percent |
| Other | 1 | 100.00% |
| MAILsweeper (1 servers) |
|
|
| Version |
Number of Servers |
Percent |
| 4.3.20.0 | 1 | 100.00% |
| Other | 0 | 0.00% |
