According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), ZeptoMail (Zoho) is the email service provider (ESP) for 805 domains — 0.13% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
ZeptoMail is the transactional and bulk-email service operated by Zoho, a privately held software company that develops a suite of SaaS business applications. It provides SMTP relay and email-sending infrastructure to customers who want to send mail through Zoho's platform rather than managing their own mail server or selecting an independent ESP.
ZeptoMail appears predominantly in smaller organisations and mid-market sites (rather than large enterprises) concentrated on the .com domain space. Its frequent co-appearance with Google Workspace suggests it often serves as a dedicated transactional-mail path for organisations that have standardised email on Google but outsource bulk or event-driven messaging to Zoho. For email deliverability teams, ZeptoMail's presence is rarely a reputation risk — it does not dominate any category — but its SPF mechanisms are useful signals for identifying how a sender's mail infrastructure is partitioned.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 8 | 1.0% |
| Top 100,000 | 88 | 10.9% |
| Top 1,000,000 | 614 | 76.3% |
| Unranked | 94 | 11.7% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 436 | 54.2% | |
| .in | 62 | 7.7% | |
| .org | 35 | 4.3% | |
| .net | 25 | 3.1% | |
| .com.br | 18 | 2.2% | |
| .ca | 14 | 1.7% | |
| .io | 13 | 1.6% | |
| .co | 12 | 1.5% | |
| .ai | 11 | 1.4% | |
| .co.in | 11 | 1.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 805 domains.
| Type | Service | Domains | Share of ZeptoMail (Zoho) users |
|---|---|---|---|
| Mailbox | Google Workspace | 208 | 25.8% |
| Mailbox | Zoho Mail | 196 | 24.3% |
| Mailbox | Microsoft 365 | 149 | 18.5% |
| Mailbox | Self-Hosted | 48 | 6.0% |
| Mailbox | Zoho Mail (IN) | 36 | 4.5% |
| Mailbox | Zoho Mail (EU) | 29 | 3.6% |
| ESP | Zoho Campaigns | 139 | 17.3% |
| ESP | Amazon SES | 73 | 9.1% |
| ESP | Zoho ZeptoMail | 73 | 9.1% |
| ESP | SendGrid (Twilio) | 50 | 6.2% |
Like most shared ESPs, ZeptoMail sends mail on behalf of many customers from overlapping IP space and sending domains authenticated via SPF includes such as include:zeptomail.com. This means the reputation of a sender's ZeptoMail messages depends not only on their own practices but on the sending behaviour of other customers on the same infrastructure. Organisations relying on ZeptoMail should monitor bounce rates, spam-complaint feedback loops, and list hygiene to isolate their sending reputation from potential misbehaviour by neighbouring accounts.
See the full ZeptoMail (Zoho) data page (KPI cards, trend, sample domains) →
Testing against ZeptoMail is worthwhile if your audience includes mid-market organisations running Zoho's suite alongside Google Workspace, but it is not a priority for campaigns targeting large enterprises or top-tier domains, since ZeptoMail's user base occupies the long tail rather than the brand-leadership category.
805 domains in the Tranco top-1M use ZeptoMail (Zoho) as their email service provider (ESP) as of July 13, 2026 (0.13% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
ZeptoMail (Zoho) accounts for 0.13% 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.
ZeptoMail (Zoho)'s largest TLD is .com (54.2% of its domains); it appears across 90 TLDs in total.