According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), iCoreMail is the email service provider (ESP) for 363 domains — 0.06% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
iCoreMail is an email service provider whose presence across the internet is detected primarily through SPF include mechanisms. The service is concentrated in the Chinese domain space (.cn) and predominantly serves smaller websites and regional organisations rather than major enterprises.
For anyone sending mail through or receiving from sites using iCoreMail, the provider's positioning in the long tail of the email ecosystem means it typically lacks the established reputation infrastructure of major ESPs. Its concentration in the .cn space and frequent co-occurrence with lesser-known providers means authentication and deliverability practices on iCoreMail-reliant domains may be less standardised, requiring heightened scrutiny of SPF records and sender reputation signals during assessment.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.3% |
| Top 10,000 | 5 | 1.4% |
| Top 100,000 | 57 | 15.7% |
| Top 1,000,000 | 255 | 70.2% |
| Unranked | 45 | 12.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .cn | 190 | 52.3% | |
| .com | 123 | 33.9% | |
| .com.cn | 28 | 7.7% | |
| .net | 9 | 2.5% | |
| .id | 3 | 0.8% | |
| .cc | 2 | 0.6% | |
| .fm | 1 | 0.3% | |
| .ai | 1 | 0.3% | |
| .im | 1 | 0.3% | |
| .co | 1 | 0.3% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 363 domains.
| Type | Service | Domains | Share of iCoreMail users |
|---|---|---|---|
| Mailbox | Unknown / Other | 155 | 42.7% |
| Mailbox | Self-Hosted | 111 | 30.6% |
| Mailbox | Generic / unmatched (mx*.*) | 82 | 22.6% |
| Mailbox | QQ Mail (Tencent) | 3 | 0.8% |
| Mailbox | Google Workspace | 3 | 0.8% |
| Mailbox | Amazon WorkMail | 1 | 0.3% |
| ESP | Mandrill | 3 | 0.8% |
| ESP | Zendesk | 2 | 0.6% |
| ESP | Mailgun | 2 | 0.6% |
| ESP | HubSpot | 1 | 0.3% |
iCoreMail's concentration in smaller sites and regional markets means that major reputation databases and blocklists may have limited historical data on its sending patterns and infrastructure. When assessing inboxing outcomes for sites using iCoreMail, mailbox providers' algorithms may treat the provider with caution due to sparse track record visibility, potentially affecting delivery to subscribers whose ISP relies on behavioural or third-party reputation signals rather than SPF and DKIM validation alone.
See the full iCoreMail data page (KPI cards, trend, sample domains) →
iCoreMail is an email service provider; when it appears in an SPF record via an include mechanism, it means that domain has authorised iCoreMail to send mail on its behalf. This is particularly common among smaller sites and organisations in the Chinese domain space.
363 domains in the Tranco top-1M use iCoreMail as their email service provider (ESP) as of July 13, 2026 (0.06% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
iCoreMail 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.
iCoreMail's largest TLD is .cn (52.3% of its domains); it appears across 14 TLDs in total.