According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), SecureMX is the email service provider (ESP) for 609 domains — 0.10% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
SecureMX is a Japanese email service provider (ESP) that organisations use to handle SMTP infrastructure, identifiable through SPF include mechanisms in domain configurations. Its footprint is concentrated among smaller and mid-market websites on .co.jp domains rather than the largest international brands.
For sysadmins, deliverability engineers, and marketers working with email, SecureMX's regional concentration provides useful context: senders targeting Japanese organisations may encounter it in their recipients' SPF records, and anyone mapping the email provider ecosystem should recognise its focus on the smaller-site and Japanese-market segment as a distinct provider tier.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 5 | 0.8% |
| Top 100,000 | 109 | 17.9% |
| Top 1,000,000 | 469 | 77.0% |
| Unranked | 26 | 4.3% |
| TLD | Domains | Share | |
|---|---|---|---|
| .co.jp | 327 | 53.7% | |
| .jp | 136 | 22.3% | |
| .com | 73 | 12.0% | |
| .or.jp | 34 | 5.6% | |
| .ac.jp | 14 | 2.3% | |
| .ne.jp | 8 | 1.3% | |
| .net | 5 | 0.8% | |
| .org | 3 | 0.5% | |
| .co.id | 3 | 0.5% | |
| .co.kr | 1 | 0.2% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 609 domains.
| Type | Service | Domains | Share of SecureMX users |
|---|---|---|---|
| Mailbox | SecureMX (JP) | 483 | 79.3% |
| Mailbox | Microsoft 365 | 48 | 7.9% |
| Mailbox | Unknown / Other | 21 | 3.4% |
| Mailbox | Google Workspace | 20 | 3.3% |
| Mailbox | Self-Hosted | 16 | 2.6% |
| Mailbox | Proofpoint | 6 | 1.0% |
| ESP | Amazon SES | 81 | 13.3% |
| ESP | Salesforce | 63 | 10.3% |
| ESP | Repica WebCAS | 47 | 7.7% |
| ESP | CrmStyle | 30 | 4.9% |
SecureMX's presence is almost entirely confined to .co.jp domains and smaller organisations within Japan. This means senders and reputation managers targeting global audiences rarely need to configure specifically for SecureMX, but anyone conducting regional testing in Japan or analysing Japanese email infrastructure should note it as part of the local provider landscape.
See the full SecureMX data page (KPI cards, trend, sample domains) →
Only if you use SecureMX as your outbound mail provider. Standard SPF, DKIM, and DMARC configuration suffices for senders targeting Japanese recipients; you need not configure specifically for SecureMX.
609 domains in the Tranco top-1M use SecureMX as their email service provider (ESP) as of July 13, 2026 (0.10% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
SecureMX accounts for 0.10% 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.
SecureMX's largest TLD is .co.jp (53.7% of its domains); it appears across 15 TLDs in total.