Rule email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 13, 2026), Rule is the email service provider (ESP) for 141 domains — 0.02% of 628,913 SPF-publishing domains. Its strongest TLD is .se (56.0% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-13 DNS snapshot.
What Rule represents in this dataset
Rule — Swedish marketing automation.
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 2026-09-13 snapshot shows about Rule
Across 12 distinct TLDs its top three are .se (56.0%), .com (22.0%), .de (7.8%) — together 85.8% of the 141 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 Microsoft 365 (Mailbox, 88 domains, 62.4% of them), followed by Google Workspace (21.3%). 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 (2026-09-13); 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 Rule
What else the same 141 domains use — cross-tabulated from the same daily snapshot (2026-09-13).
| Type | Service | Domains | Share of Rule users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 88 | 62.4% |
| Mailbox | Google Workspace | 30 | 21.3% |
| Mailbox | Unknown / Other | 9 | 6.4% |
| Mailbox | Generic / unmatched (mx*.*) | 5 | 3.5% |
| Mailbox | Hornetsecurity | 2 | 1.4% |
| Mailbox | One.com mailpod | 1 | 0.7% |
| ESP | Zendesk | 28 | 19.9% |
| ESP | Amazon SES | 26 | 18.4% |
| ESP | Mandrill | 26 | 18.4% |
| ESP | SendGrid (Twilio) | 19 | 13.5% |
TLD distribution (top 12 of 12)
Frequently asked questions
How many domains use Rule?
141 domains in the Tranco top-1M use Rule as their email service provider (ESP) as of September 13, 2026, according to Live Direct Marketing's daily DNS scan.
What is Rule's market share?
Rule holds 0.02% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-13). The number is recomputed every day.
What are the biggest alternatives to Rule?
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 2026-09-13).
Largest email service provider (ESP)s in this category
Amazon SES (6.19%) · SendGrid (Twilio) (4.64%) · Mailgun (4.01%) · Zendesk (3.77%) · Mailchimp (3.57%) · Mandrill (3.25%) · HubSpot (3.12%) · Salesforce (2.55%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.95%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 141 domains.