esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Sailthru is the email service provider (ESP) for 634 domains — 0.10% of 617,702 SPF-publishing domains. Its strongest TLD is .com (78.1% of its domains). Detection: include: mechanisms in the SPF record.
What else the same 634 domains use — cross-tabulated from the same daily snapshot (2026-07-13).
| Type | Service | Domains | Share of Sailthru users |
|---|---|---|---|
| Mailbox | Google Workspace | 310 | 48.9% |
| Mailbox | Microsoft 365 | 160 | 25.2% |
| Mailbox | Mimecast | 47 | 7.4% |
| Mailbox | Proofpoint | 46 | 7.3% |
| Mailbox | Unknown / Other | 24 | 3.8% |
| Mailbox | Self-Hosted | 7 | 1.1% |
| ESP | Amazon SES | 98 | 15.5% |
| ESP | SendGrid (Twilio) | 93 | 14.7% |
| ESP | Mandrill | 88 | 13.9% |
| ESP | Mailchimp | 74 | 11.7% |
634 domains in the Tranco top-1M use Sailthru as their email service provider (ESP) as of July 13, 2026, according to Live Direct Marketing's daily DNS scan.
Sailthru holds 0.10% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-13). 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 2026-07-13).
Amazon SES (6.21%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.86%) · Mailchimp (3.69%) · Mandrill (3.36%) · HubSpot (3.18%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.80%)
Showing 100 of 634 domains.