esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 26, 2026), Campaign Monitor is the email service provider (ESP) for 3,562 domains — 0.56% of 630,738 SPF-publishing domains. Its share has been stable over the last 30 days. Its strongest TLD is .com (48.5% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-07-26 DNS snapshot.
Australia-origin newsletter ESP (Marigold), popular with agencies.
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.
Across 130 distinct TLDs its top three are .com (48.5%), .org (9.4%), .com.au (6.1%) — together 64.1% of the 3,562 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Microsoft 365 (Mailbox, 1,363 domains, 38.3% of them), followed by Google Workspace (27.3%). Its share of SPF-publishing domains has not moved measurably in 30 days. 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 (2026-07-26); 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.
What else the same 3,562 domains use — cross-tabulated from the same daily snapshot (2026-07-26).
| Type | Service | Domains | Share of Campaign Monitor users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 1,363 | 38.3% |
| Mailbox | Google Workspace | 973 | 27.3% |
| Mailbox | Mimecast | 246 | 6.9% |
| Mailbox | Unknown / Other | 179 | 5.0% |
| Mailbox | Self-Hosted | 145 | 4.1% |
| Mailbox | Proofpoint | 116 | 3.3% |
| ESP | Amazon SES | 502 | 14.1% |
| ESP | SendGrid (Twilio) | 459 | 12.9% |
| ESP | Zendesk | 333 | 9.3% |
| ESP | Salesforce | 332 | 9.3% |
3,562 domains in the Tranco top-1M use Campaign Monitor as their email service provider (ESP) as of July 26, 2026, according to Live Direct Marketing's daily DNS scan.
Campaign Monitor holds 0.56% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-26). The number is recomputed every day.
Campaign Monitor's share has been stable over the last 30 days (±0.01 pp).
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 2026-07-26).
Amazon SES (6.17%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.83%) · Mailchimp (3.70%) · Mandrill (3.36%) · HubSpot (3.19%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.82%)
Showing 100 of 3,562 domains.