According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), MailWise (mwprem) is the email service provider (ESP) for 162 domains — 0.03% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
MailWise is an email service provider identified in email infrastructure by its SPF mechanism mwprem. Organisations use it to delegate outbound email delivery, similar to other third-party email platforms that manage authentication, reputation, and routing on behalf of their customers.
The prevalence of mwprem SPF records clusters predominantly among smaller and mid-market senders, with particularly strong concentration in the Japanese (.co.jp) domain space. For email receivers, this footprint suggests mail bearing mwprem authentication typically originates from regional or vertical-market sources. For senders using MailWise, deliverability depends on correct SPF inclusion, DKIM signing, and DMARC alignment—failures in any step can degrade inbox placement.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 10 | 6.2% |
| Top 1,000,000 | 140 | 86.4% |
| Unranked | 12 | 7.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .co.jp | 77 | 47.5% | |
| .jp | 33 | 20.4% | |
| .com | 23 | 14.2% | |
| .or.jp | 22 | 13.6% | |
| .net | 4 | 2.5% | |
| .ne.jp | 2 | 1.2% | |
| .info | 1 | 0.6% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 162 domains.
| Type | Service | Domains | Share of MailWise (mwprem) users |
|---|---|---|---|
| Mailbox | OCN (NTT Japan) | 93 | 57.4% |
| Mailbox | Self-Hosted | 36 | 22.2% |
| Mailbox | Microsoft 365 | 14 | 8.6% |
| Mailbox | Google Workspace | 5 | 3.1% |
| Mailbox | SecureMX (JP) | 3 | 1.9% |
| Mailbox | Trend Micro | 2 | 1.2% |
| ESP | Amazon SES | 11 | 6.8% |
| ESP | Repica WebCAS | 7 | 4.3% |
| ESP | SendGrid (Twilio) | 4 | 2.5% |
| ESP | ActiveGate | 4 | 2.5% |
When organisations send mail through MailWise, their SPF record must explicitly include the mwprem mechanism to authorise the ESP's sending infrastructure. Because mwprem is less visible than major global ESPs, authentication gaps sometimes go unnoticed during SPF audits or mail-system migrations. Receivers applying strict SPF checking will reject unsigned mail from MailWise if the sending domain's SPF record omits mwprem, making correct configuration essential for deliverability.
See the full MailWise (mwprem) data page (KPI cards, trend, sample domains) →
Mwprem is the SPF identifier for MailWise, an email service provider concentrated among smaller sites and Japanese-market senders. Proper SPF, DKIM, and DMARC configuration is essential for mail sent through it to reach recipient inboxes.
162 domains in the Tranco top-1M use MailWise (mwprem) as their email service provider (ESP) as of July 13, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
MailWise (mwprem) accounts for 0.03% 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.
MailWise (mwprem)'s largest TLD is .co.jp (47.5% of its domains); it appears across 7 TLDs in total.