MailSwitch email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), MailSwitch is the email service provider (ESP) for 110 domains — 0.02% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 110 domains in the Tranco top-1M use MailSwitch (0.02% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .nl (79.1% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email security gateway.
Why MailSwitch appears in this category
MailSwitch — Dutch email security gateway.
We classify it as a email security gateway 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.
MailSwitch is an email service provider identified through SPF include mechanisms in DNS records across internet domains. It operates primarily in the Netherlands and is concentrated among smaller and mid-market website operators rather than the largest global brands.
For email practitioners, MailSwitch's presence in this demographic and geography represents a long-tail segment of the sending ecosystem. Its frequent appearance alongside Microsoft 365 in SPF configurations suggests a particular niche in hybrid or multi-vendor email deployments, particularly within Dutch-language markets.
Where MailSwitch sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 3 | 2.7% |
| Top 100,000 | 14 | 12.7% |
| Top 1,000,000 | 93 | 84.5% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .nl | 87 | 79.1% | |
| .com | 15 | 13.6% | |
| .be | 2 | 1.8% | |
| .org | 2 | 1.8% | |
| .travel | 1 | 0.9% | |
| .eu | 1 | 0.9% | |
| .de | 1 | 0.9% | |
| .co | 1 | 0.9% |
What MailSwitch users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 110 domains.
| Type | Service | Domains | Share of MailSwitch users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 85 | 77.3% |
| Mailbox | Google Workspace | 12 | 10.9% |
| Mailbox | Unknown / Other | 6 | 5.5% |
| Mailbox | Mimecast | 1 | 0.9% |
| Mailbox | Proofpoint | 1 | 0.9% |
| Mailbox | Symantec MessageLabs | 1 | 0.9% |
| ESP | SendGrid (Twilio) | 15 | 13.6% |
| ESP | Mailjet (Sinch) | 15 | 13.6% |
| ESP | Amazon SES | 14 | 12.7% |
| ESP | Mandrill | 14 | 12.7% |
SPF configuration patterns and Microsoft 365 co-deployment
MailSwitch SPF includes typically appear in DNS records that also reference Microsoft 365, suggesting a deployment pattern amongst organisations using both a primary cloud email platform and an additional ESP. This co-configuration is relevant during SPF audits, particularly for networks serving the Dutch market, as SPF chain depth and DNS lookup-count implications scale with the number of included mechanisms.
See the full MailSwitch data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against MailSwitch?
MailSwitch's footprint is concentrated amongst smaller organisations and in the Netherlands rather than distributed across the largest global senders. Its relevance to your testing strategy depends on whether your recipient base significantly overlaps with those segments.
How many domains use MailSwitch?
110 domains in the Tranco top-1M use MailSwitch as their email service provider (ESP) as of September 14, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is MailSwitch common enough to affect email deliverability testing?
MailSwitch accounts for 0.02% 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.
Which countries or TLDs use MailSwitch most?
MailSwitch's largest TLD is .nl (79.1% of its domains); it appears across 8 TLDs in total.