According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), HDEMS is the email service provider (ESP) for 465 domains — 0.08% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
HDEMS is a Japanese email service provider that processes mail for a subset of web properties, primarily in the Japanese market. It is detected in email infrastructure through SPF include records, where it appears alongside other mail processors in authentication configurations.
Because HDEMS concentrates in smaller sites rather than global enterprise scale, and clusters heavily within .co.jp domains, its presence typically signals regional or SMB-focused mail infrastructure. Its frequent pairing with Microsoft 365 in SPF records suggests some organisations use HDEMS alongside or in transition from Microsoft's platform, which is relevant for understanding the delivery behaviour of such hybrid setups.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.2% |
| Top 10,000 | 5 | 1.1% |
| Top 100,000 | 47 | 10.1% |
| Top 1,000,000 | 380 | 81.7% |
| Unranked | 32 | 6.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .co.jp | 269 | 57.8% | |
| .com | 78 | 16.8% | |
| .jp | 71 | 15.3% | |
| .or.jp | 17 | 3.7% | |
| .ac.jp | 11 | 2.4% | |
| .net | 6 | 1.3% | |
| .coop | 3 | 0.6% | |
| .ne.jp | 2 | 0.4% | |
| .io | 2 | 0.4% | |
| .org | 2 | 0.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 465 domains.
| Type | Service | Domains | Share of HDEMS users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 228 | 49.0% |
| Mailbox | Google Workspace | 157 | 33.8% |
| Mailbox | Trend Micro | 18 | 3.9% |
| Mailbox | SecureMX (JP) | 13 | 2.8% |
| Mailbox | Symantec MessageLabs | 12 | 2.6% |
| Mailbox | Proofpoint | 11 | 2.4% |
| ESP | Amazon SES | 84 | 18.1% |
| ESP | Salesforce | 70 | 15.1% |
| ESP | Repica WebCAS | 45 | 9.7% |
| ESP | CrmStyle | 30 | 6.5% |
HDEMS appears most often in SPF records as one component of multi-hop mail authentication chains, particularly alongside Microsoft 365, suggesting organisations using multiple processors rather than HDEMS alone. When your mail enters HDEMS as part of such a chain, that provider's IP reputation and its relationships with Japanese ISPs and mailbox providers can influence delivery, even if HDEMS is not your primary platform. Understanding HDEMS's regional reputation standing becomes relevant to your send quality if your infrastructure routes through it.
See the full HDEMS data page (KPI cards, trend, sample domains) →
HDEMS is a regional Japanese email service provider; test against it only if your primary audience is in Japan or you operate a Japan-targeted service.
465 domains in the Tranco top-1M use HDEMS as their email service provider (ESP) as of July 13, 2026 (0.08% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
HDEMS accounts for 0.08% 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.
HDEMS's largest TLD is .co.jp (57.8% of its domains); it appears across 14 TLDs in total.