Sailthru email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Sailthru is the email service provider (ESP) for 610 domains — 0.10% of 629,828 SPF-publishing domains. Its strongest TLD is .com (78.7% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-12 DNS snapshot.
What Sailthru represents in this dataset
Marigold Sailthru — publisher-focused personalisation ESP.
Directory category: Esp. The classification comes from include: mechanisms in the SPF record. It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-12 snapshot shows about Sailthru
Across 37 distinct TLDs its top three are .com (78.7%), .org (4.9%), .co.uk (3.6%) — together 87.2% of the 610 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is Google Workspace (Mailbox, 296 domains, 48.5% of them), followed by Microsoft 365 (25.4%). Directly comparable by the same detection rule: Amazon SES, SendGrid (Twilio), Mailgun. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-12); a domain appears here when its published records match the include: mechanisms in the SPF record rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with Sailthru
What else the same 610 domains use — cross-tabulated from the same daily snapshot (2026-09-12).
| Type | Service | Domains | Share of Sailthru users |
|---|---|---|---|
| Mailbox | Google Workspace | 296 | 48.5% |
| Mailbox | Microsoft 365 | 155 | 25.4% |
| Mailbox | Mimecast | 50 | 8.2% |
| Mailbox | Proofpoint | 43 | 7.0% |
| Mailbox | Unknown / Other | 20 | 3.3% |
| Mailbox | Self-Hosted | 8 | 1.3% |
| ESP | Amazon SES | 95 | 15.6% |
| ESP | Mandrill | 88 | 14.4% |
| ESP | SendGrid (Twilio) | 86 | 14.1% |
| ESP | Mailchimp | 73 | 12.0% |
TLD distribution (top 30 of 37)
Frequently asked questions
How many domains use Sailthru?
610 domains in the Tranco top-1M use Sailthru as their email service provider (ESP) as of September 12, 2026, according to Live Direct Marketing's daily DNS scan.
What is Sailthru's market share?
Sailthru holds 0.10% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-12). The number is recomputed every day.
What are the biggest alternatives to Sailthru?
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 2026-09-12).
Largest email service provider (ESP)s in this category
Amazon SES (6.18%) · SendGrid (Twilio) (4.63%) · Mailgun (4.01%) · Zendesk (3.76%) · Mailchimp (3.57%) · Mandrill (3.25%) · HubSpot (3.11%) · Salesforce (2.55%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.94%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 610 domains.