| Maildrop | Maildrop | 1 |
| Maildwarf | Maildwarf | 2 |
| Mailenable | Mailenable | 10 |
| Mailenable | Mailenable Enterprise | 30 |
| Mailenable | Mailenable Professional | 34 |
| Mailenable | Mailenable Standard | 8 |
| XQueue GmbH | Maileon For WordPress | 1 |
| Jenkins | Mailer | 1 |
| MailerLite | MailerLite (WordPress Plugin) | 1 |
| Unknown | MailerLite – Signup Forms (official) | 1 |
| Stalkerlab | Mailers | 1 |
| Gfi | Mailessentials | 1 |
| Ranson Johnson | Mailform | 3 |
| Scripts.bdr130 | Mailform | 2 |
| Sebastian Winterhalder | Mailform | 3 |
| SYNCK GRAPHICA | Mailform Pro CGI | 3 |
| H-fj | Mailform Plugin | 1 |
| Synck Graphica | Mailform Pro Cgi | 0 |
| Tumbleweed | Mailgate Email Firewall | 2 |
| Unu Networks | Mailgust | 2 |
| Drupal | Mailhandler | 1 |
| Erwin Lansing | Mailidx | 1 |
| Techno Dreams | Mailing List | 1 |
| Eternalmart | Mailing List Manager | 8 |
| Ocean12 Technologies | Mailing List Manager | 5 |
| Phplist | Mailing List Manager | 8 |
| Webinsta | Mailing List Manager | 1 |
| Mailing-manager | Mailing List Manager Pro | 1 |
| Phptpoint | Mailing Server Using File Handling | 1 |
| Codefixer | Mailinglistpro | 1 |
| Ninjadesigns | Mailist | 2 |
| Mailmachinepro | Mailmachine Pro | 1 |
| GNU Mailman | Mailman | 12 |
| Gnu | Mailman | 12 |
| Kjtechforce | Mailman | 46 |
| Mailman | Mailman | 39 |
| Add2it | Mailman Free | 2 |
| Endymion | Mailman Webmail | 3 |
| Logicalware | Mailmanager | 3 |
| Trustwave | Mailmarshal | 0 |
| Mailmarshal | Mailmarshal Smtp | 2 |
| Marshal | Mailmarshal Smtp | 2 |
| Freron | Mailmate | 4 |
| Smartmax Software | Mailmax | 3 |
| Mailmgr | Mailmgr | 1 |
| Mailnews.cgi | Mailnews.cgi | 1 |
| Deutschepost | Mailoptimizer | 1 |
| Skyarc | Mailpack | 2 |
| Mailpile | Mailpile | 1 |
| Synology | Mailplus Server | 1 |
| Mailpoet | Mailpoet | 1 |
| Mailpoet | Mailpoet Newsletters | 1 |
| Tips | Mailpost | 4 |
| Mailreader.com | Mailreader.com | 3 |
| Mailrelay | Mailrelay | 1 |
| Drupal | Mailsave | 1 |
| Microworld Technologies | Mailscan | 4 |
| Debian | Mailscanner | 7 |
| Mailscanner | Mailscanner | 1 |
| Baltimore Technologies | Mailsecure | 1 |
| Gfi | Mailsecurity | 3 |
| Revilloc | Mailserver | 2 |
| Sh39 | Mailserver | 2 |
| Mailsite | Mailsite | 10 |
| Rockliffe | Mailsite | 10 |
| Rockliffe | Mailsite Express | 6 |
| EverPress | Mailster | 1 |
| Mailstore | Mailstore | 0 |
| Mailstore | Mailstore Server | 1 |
| 3r Soft | Mailstudio 2000 | 2 |
| Afterlogic | Mailsuite Pro | 1 |
| Clearswift | Mailsweeper | 18 |
| Clearswift Limited | Mailsweeper | 18 |
| Clearswift | Mailsweeper Business Suite I | 1 |
| Clearswift | Mailsweeper Business Suite Ii | 1 |
| Clearswift | Mailsweeper For Exchange | 2 |
| Clearswift | Mailsweeper For Smtp | 5 |
| Brian Dorricott | Mailto | 1 |
| Ranson Johnson | Mailto Cgi Script | 1 |
| Mailtrain | Mailtrain | 1 |
| Mailtraq | Mailtraq | 1 |
| Oacstudio | Mailtree Log Mail | 1 |
| Mailu | Mailu | 0 |
| Gnu | Mailutils | 1 |
| Mailvelope | Mailvelope | 4 |
| Mailwasher | Mailwasher Server | 1 |
| Mailwatch | Mailwatch | 1 |
| Cybozu | Mailwise | 8 |
| Sitecubed | Mailworks Professional | 1 |
| Heirloom | Mailx | 2 |
| Sgi | Mailx | 2 |
| MainWP | MainWP Broken Links Checker Extension | 1 |
| Unknown | MainWP Child - Securely Connects Sites To The MainWP WordPress Manager Dashboard | 1 |
| Unknown | MainWP Child Reports | 1 |
| Mainwp | MainWP Child – Securely Connects Sites To The MainWP WordPress Manager Dashboard | 1 |
| MainWP | MainWP Code Snippets Extension | 1 |
| Mainwp | MainWP Dashboard – WordPress Manager For Multiple Websites Maintenance | 1 |
| MainWP | MainWP Dashboard – WordPress Manager For Multiple Websites Maintenance | 1 |
| MainWP | MainWP Google Analytics Extension | 1 |
| MainWP | MainWP Maintenance Extension | 1 |
