esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), Useinbox is the email service provider (ESP) for 83 domains — 0.01% of 617,244 SPF-publishing domains. Its strongest TLD is .com (51.8% of its domains). Detection: include: mechanisms in the SPF record.
What else the same 83 domains use — cross-tabulated from the same daily snapshot (2026-07-12).
| Type | Service | Domains | Share of Useinbox users |
|---|---|---|---|
| Mailbox | Google Workspace | 28 | 33.7% |
| Mailbox | Self-Hosted | 14 | 16.9% |
| Mailbox | Microsoft 365 | 13 | 15.7% |
| Mailbox | Unknown / Other | 10 | 12.0% |
| Mailbox | Yandex 360 | 5 | 6.0% |
| Mailbox | Generic / unmatched (mx*.*) | 4 | 4.8% |
| ESP | Amazon SES | 6 | 7.2% |
| ESP | MailerSend | 4 | 4.8% |
| ESP | Zendesk | 3 | 3.6% |
| ESP | Elastic Email | 3 | 3.6% |
83 domains in the Tranco top-1M use Useinbox as their email service provider (ESP) as of July 12, 2026, according to Live Direct Marketing's daily DNS scan.
Useinbox holds 0.01% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-12). The number is recomputed every day.
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-07-12).
Amazon SES (6.21%) · SendGrid (Twilio) (4.75%) · Mailgun (4.11%) · Zendesk (3.87%) · Mailchimp (3.69%) · Mandrill (3.36%) · HubSpot (3.18%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.80%)
Showing 83 of 83 domains.