APSIS email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), APSIS is the email service provider (ESP) for 361 domains — 0.06% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 361 domains in the Tranco top-1M use APSIS (0.06% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .se (41.6% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email service provider.
Why APSIS appears in this category
APSIS — Swedish ESP, strong Nordic SMB presence.
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.
APSIS is a Swedish-based email service provider that processes email sending and campaign delivery for customers internationally. Its infrastructure appears in the authentication records of smaller to mid-market organisations across many country-code domains, with particular concentration in .se TLD registrations.
The presence of APSIS in a sender's authentication records typically signals mid-market or regional adoption rather than enterprise deployment. Those evaluating email deliverability should recognise APSIS as a common inclusion within the smaller-organisation segment, and should note that APSIS frequently co-exists with Microsoft 365 in the same sending infrastructure, creating a multi-platform authentication scenario that affects both configuration and reputation signals.
Where APSIS sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 4 | 1.1% |
| Top 100,000 | 39 | 10.8% |
| Top 1,000,000 | 315 | 87.3% |
| Unranked | 3 | 0.8% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .se | 150 | 41.6% | |
| .com | 78 | 21.6% | |
| .dk | 39 | 10.8% | |
| .no | 38 | 10.5% | |
| .fi | 15 | 4.2% | |
| .eu | 5 | 1.4% | |
| .org | 5 | 1.4% | |
| .cz | 5 | 1.4% | |
| .de | 4 | 1.1% | |
| .co.uk | 3 | 0.8% |
What APSIS users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 361 domains.
| Type | Service | Domains | Share of APSIS users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 236 | 65.4% |
| Mailbox | Google Workspace | 46 | 12.7% |
| Mailbox | Self-Hosted | 15 | 4.2% |
| Mailbox | Unknown / Other | 13 | 3.6% |
| Mailbox | Proofpoint | 11 | 3.0% |
| Mailbox | Generic / unmatched (mx*.*) | 10 | 2.8% |
| ESP | SendGrid (Twilio) | 56 | 15.5% |
| ESP | Mandrill | 56 | 15.5% |
| ESP | Zendesk | 50 | 13.9% |
| ESP | Amazon SES | 42 | 11.6% |
Multi-platform sender infrastructure
APSIS frequently appears in organisations that also rely on Microsoft 365 for mail services, creating a multi-platform sending environment. When both systems are present, senders must ensure their SPF records include both providers correctly, and reputation signals for the domain will reflect traffic from both services; understanding this split infrastructure is important when diagnosing delivery issues or analysing sender reputation across different sending paths.
See the full APSIS data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is APSIS in email authentication?
APSIS is a Swedish email service provider that appears as an SPF include in the authentication records of mid-market and smaller organisations. Senders who deploy APSIS must add its include directive to their SPF record to authenticate outbound mail.
How many domains use APSIS?
361 domains in the Tranco top-1M use APSIS as their email service provider (ESP) as of September 14, 2026 (0.06% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is APSIS common enough to affect email deliverability testing?
APSIS accounts for 0.06% 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 APSIS most?
APSIS's largest TLD is .se (41.6% of its domains); it appears across 23 TLDs in total.