Masterbase email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 20, 2026), Masterbase is the email service provider (ESP) for 290 domains — 0.05% of 638,158 SPF-publishing domains. Its strongest TLD is .cl (42.1% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-20 DNS snapshot.
What Masterbase represents in this dataset
Chilean marketing automation, LatAm reach.
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 2026-09-20 snapshot shows about Masterbase
Across 18 distinct TLDs its top three are .cl (42.1%), .com (18.6%), .pe (7.6%) — together 68.3% of the 290 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, 130 domains, 44.8% of them), followed by Google Workspace (21.0%). 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 (2026-09-20); 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 Masterbase
What else the same 290 domains use — cross-tabulated from the same daily snapshot (2026-09-20).
| Type | Service | Domains | Share of Masterbase users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 130 | 44.8% |
| Mailbox | Google Workspace | 61 | 21.0% |
| Mailbox | Self-Hosted | 21 | 7.2% |
| Mailbox | Unknown / Other | 20 | 6.9% |
| Mailbox | Trend Micro | 15 | 5.2% |
| Mailbox | Proofpoint | 12 | 4.1% |
| ESP | Amazon SES | 51 | 17.6% |
| ESP | emBlue | 24 | 8.3% |
| ESP | Mandrill | 24 | 8.3% |
| ESP | Fidelizador | 22 | 7.6% |
TLD distribution (top 18 of 18)
Frequently asked questions
How many domains use Masterbase?
290 domains in the Tranco top-1M use Masterbase as their email service provider (ESP) as of September 20, 2026, according to Live Direct Marketing's daily DNS scan.
What is Masterbase's market share?
Masterbase holds 0.05% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-20). The number is recomputed every day.
What are the biggest alternatives to Masterbase?
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 2026-09-20).
Largest email service provider (ESP)s in this category
Amazon SES (6.21%) · SendGrid (Twilio) (4.67%) · Mailgun (4.01%) · Zendesk (3.77%) · Mailchimp (3.61%) · Mandrill (3.26%) · HubSpot (3.17%) · Salesforce (2.57%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.96%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 290 domains.