ZeptoMail (Zoho) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 16, 2026), ZeptoMail (Zoho) is the email service provider (ESP) for 813 domains — 0.13% of 634,905 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 813 domains in the Tranco top-1M use ZeptoMail (Zoho) (0.13% of SPF-publishing domains).
- Snapshot date: 2026-09-16 — recomputed every day.
- Strongest TLD: .com (53.6% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why ZeptoMail (Zoho) appears in this category
ZeptoMail — Zoho transactional email API.
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
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.
Where ZeptoMail (Zoho) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 6 | 0.7% |
| Top 100,000 | 80 | 9.8% |
| Top 1,000,000 | 721 | 88.7% |
| Unranked | 5 | 0.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 436 | 53.6% | |
| .in | 65 | 8.0% | |
| .org | 40 | 4.9% | |
| .net | 28 | 3.4% | |
| .ca | 18 | 2.2% | |
| .co | 13 | 1.6% | |
| .com.br | 12 | 1.5% | |
| .io | 12 | 1.5% | |
| .co.in | 12 | 1.5% | |
| .de | 11 | 1.4% |
What ZeptoMail (Zoho) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 813 domains.
| Type | Service | Domains | Share of ZeptoMail (Zoho) users |
|---|---|---|---|
| Mailbox | Google Workspace | 212 | 26.1% |
| Mailbox | Zoho Mail | 187 | 23.0% |
| Mailbox | Microsoft 365 | 157 | 19.3% |
| Mailbox | Self-Hosted | 47 | 5.8% |
| Mailbox | Zoho Mail (IN) | 39 | 4.8% |
| Mailbox | Zoho Mail (EU) | 26 | 3.2% |
| ESP | Zoho Campaigns | 138 | 17.0% |
| ESP | Zoho ZeptoMail | 65 | 8.0% |
| ESP | Amazon SES | 65 | 8.0% |
| ESP | SendGrid (Twilio) | 49 | 6.0% |
Shared infrastructure and reputation risk
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) →
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Frequently asked questions
Should I test email deliverability against ZeptoMail?
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.
How many domains use ZeptoMail (Zoho)?
813 domains in the Tranco top-1M use ZeptoMail (Zoho) as their email service provider (ESP) as of September 16, 2026 (0.13% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is ZeptoMail (Zoho) common enough to affect email deliverability testing?
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.
Which countries or TLDs use ZeptoMail (Zoho) most?
ZeptoMail (Zoho)'s largest TLD is .com (53.6% of its domains); it appears across 86 TLDs in total.