As of October 15, 2026, Mailbox.org is used by 12,768 websites in the TechLeads index: 0.10% of all Email detections, the 40th most-used of 135 Email technologies.
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Citation
TechLeads. "Mailbox.org Customers and Market Share." Data as of October 15, 2026. https://techleads.fyi/technology/mailbox-org/market-shareHTML link
<a href="https://techleads.fyi/technology/mailbox-org/market-share">Mailbox.org market share (TechLeads data)</a>Websites using each technology in the TechLeads index, and its share of all Email detections.
| # | Technology | Websites | Share |
|---|---|---|---|
| 1 | Google Workspace | 3,340,371 | 26.3% |
| 2 | Microsoft 365 | 2,773,948 | 21.8% |
| 3 | Hostinger Mail | 968,459 | 7.6% |
| 4 | MailChimp | 825,798 | 6.5% |
| 5 | IONOS Mail | 694,378 | 5.5% |
| 6 | Mailgun | 670,983 | 5.3% |
| 7 | Amazon SES |
See all 12,768 websites using Mailbox.org or download the full list as a CSV for $29.
TechLeads scans public websites and detects Mailbox.org from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is Mailbox.org's website count divided by the website counts of all Email technologies we track; a site using two Email tools counts for both. Counts were last refreshed on October 15, 2026 and update daily.
| 638,331 |
| 5.0% |
| 8 | Sendgrid | 522,337 | 4.1% |
| 9 | Yandex Mail | 198,597 | 1.6% |
| 10 | Sendinblue | 191,416 | 1.5% |
| 11 | MailJet | 184,903 | 1.5% |
| 12 | Lolipop Mail | 137,541 | 1.1% |
| 13 | ActiveCampaign | 132,167 | 1.0% |
| 14 | DMARC None | 105,575 | 0.83% |
| 15 | Creativ.eMail | 103,552 | 0.82% |
| 16 | Jimdo Mail | 98,193 | 0.77% |
| 17 | MailerLite | 91,360 | 0.72% |
| 18 | SparkPost | 82,628 | 0.65% |
| 19 | ZXCS | 77,122 | 0.61% |
| 20 | LiveIntent | 72,741 | 0.57% |
| 21 | Mailbox.org | 12,768 | 0.10% |
Rows link to each competitor's market share page where one exists. The table lists the 21 most-used technologies; ranks are by website count.