Mandrill email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), Mandrill is the email service provider (ESP) for 20,460 domains — 3.24% of 631,089 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 20,460 domains in the Tranco top-1M use Mandrill (3.24% of SPF-publishing domains).
- Snapshot date: 2026-09-11 — recomputed every day.
- 30-day share change: -0.05 pp.
- Strongest TLD: .com (51.0% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Mandrill appears in this category
Mailchimp transactional add-on (formerly standalone).
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Mandrill is a transactional email service platform used by organisations to send triggered, automated messages—password resets, order confirmations, notifications, and similar one-to-one communications. It is deployed via SPF include mechanisms, allowing senders to authenticate mail sent through its infrastructure.
Mandrill's presence in email data clusters primarily among smaller and mid-market organisations rather than the largest global brands, with a particular concentration in the .com domain space. Its frequent pairing with Google Workspace deployments reflects its adoption within teams that have already standardised on Google's productivity suite.
Where Mandrill sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 28 | 0.1% |
| Top 10,000 | 326 | 1.6% |
| Top 100,000 | 2,950 | 14.4% |
| Top 1,000,000 | 17,043 | 83.3% |
| Unranked | 113 | 0.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 10,442 | 51.0% | |
| .org | 1,205 | 5.9% | |
| .nl | 728 | 3.6% | |
| .co.uk | 654 | 3.2% | |
| .net | 417 | 2.0% | |
| .com.au | 404 | 2.0% | |
| .de | 376 | 1.8% | |
| .fr | 361 | 1.8% | |
| .io | 283 | 1.4% | |
| .be | 257 | 1.3% |
What Mandrill users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 20,460 domains.
| Type | Service | Domains | Share of Mandrill users |
|---|---|---|---|
| Mailbox | Google Workspace | 8,240 | 40.3% |
| Mailbox | Microsoft 365 | 6,481 | 31.7% |
| Mailbox | Self-Hosted | 1,139 | 5.6% |
| Mailbox | Unknown / Other | 805 | 3.9% |
| Mailbox | Mimecast | 623 | 3.0% |
| Mailbox | Proofpoint | 482 | 2.4% |
| ESP | Mailchimp | 4,328 | 21.2% |
| ESP | Zendesk | 2,982 | 14.6% |
| ESP | Amazon SES | 2,751 | 13.4% |
| ESP | SendGrid (Twilio) | 2,429 | 11.9% |
SPF Configuration and Sender Verification
Mandrill operates as an outsourced sender, so organisations using it must declare that platform in their Sender Policy Framework records. When you observe a Mandrill SPF include mechanism on a domain, it indicates that domain has delegated transactional email delivery to Mandrill's infrastructure rather than handling it internally. This configuration is typical for companies that prefer to avoid the operational burden of managing email queues and bounce handling themselves.
See the full Mandrill data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test my email systems against Mandrill?
Testing against Mandrill's infrastructure is worthwhile if you interact with organisations using it—primarily smaller companies and Google Workspace users—but it is not a must-test platform in the way you would test against the largest consumer inboxes. Focus first on the major mailbox providers and corporate domains handling your traffic volume.
How many domains use Mandrill?
20,460 domains in the Tranco top-1M use Mandrill as their email service provider (ESP) as of September 11, 2026 (3.24% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Mandrill common enough to affect email deliverability testing?
Mandrill accounts for 3.24% of SPF-publishing domains in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Is Mandrill growing or declining?
Mandrill is declining — its share moved -0.05 pp over the last 30 days (as of September 11, 2026).
Which countries or TLDs use Mandrill most?
Mandrill's largest TLD is .com (51.0% of its domains); it appears across 334 TLDs in total.