mailbox
According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), ProtonMail is the mailbox provider for 1,654 domains — 0.25% of 658,108 domains with MX records. Its strongest TLD is .com (43.8% of its domains). Detection: primary MX record (lowest preference).
What else the same 1,654 domains use — cross-tabulated from the same daily snapshot (2026-07-12).
| Type | Service | Domains | Share of ProtonMail users |
|---|---|---|---|
| ESP | Mailgun | 65 | 3.9% |
| ESP | Amazon SES | 55 | 3.3% |
| ESP | SendGrid (Twilio) | 37 | 2.2% |
| ESP | MailerSend | 37 | 2.2% |
| ESP | Brevo (ex-Sendinblue) | 28 | 1.7% |
| ESP | Mailjet (Sinch) | 28 | 1.7% |
| ESP | Zendesk | 19 | 1.1% |
| ESP | Mailchimp | 16 | 1.0% |
| ESP | Mandrill | 13 | 0.8% |
| ESP | Elastic Email | 10 | 0.6% |
1,654 domains in the Tranco top-1M use ProtonMail as their mailbox provider as of July 12, 2026, according to Live Direct Marketing's daily DNS scan.
ProtonMail holds 0.25% of domains with MX records in the Tranco top-1M (snapshot of 2026-07-12). The number is recomputed every day.
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-07-12).
Self-Hosted (22.43%) · Google Workspace (21.78%) · Microsoft 365 (16.73%) · Unknown / Other (7.76%) · Generic / unmatched (mx*.*) (2.77%) · Proofpoint (1.90%) · Generic / unmatched (mail.*) (1.75%) · Yandex 360 (1.64%) · Cloudflare Email Routing (1.59%) · Mimecast (1.52%)
Showing 100 of 1,654 domains.