Zoho ZeptoMail email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Zoho ZeptoMail is the email service provider (ESP) for 2,581 domains — 0.40% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 2,581 domains in the Tranco top-1M use Zoho ZeptoMail (0.40% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- 30-day share change: -0.01 pp.
- Strongest TLD: .com (59.7% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Zoho ZeptoMail appears in this category
Zoho transactional email API (transmail.net / zoho-mail.com).
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.
Zoho ZeptoMail is Zoho Corporation's transactional email service, designed to relay application-driven messages—account confirmations, password resets, notifications, and reports—via SMTP. Zoho Corporation is an Indian software company whose business productivity suite spans email, CRM, finance, and office tools.
ZeptoMail's footprint in mail infrastructure skews toward smaller and mid-market organisations, particularly in the .com namespace, rather than enterprise-scale senders. It appears frequently paired with Google Workspace, suggesting adoption among cost-conscious businesses consolidating cloud tools. For senders, ZeptoMail's SPF includes mark a domain as reliant on a lightweight, self-hosted ESP; for receivers and reputation systems, this pattern signals smaller mail volume and newer sender history, warranting closer scrutiny of list quality and authentication rigour.
Where Zoho ZeptoMail sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 20 | 0.8% |
| Top 100,000 | 276 | 10.7% |
| Top 1,000,000 | 2,267 | 87.8% |
| Unranked | 18 | 0.7% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,542 | 59.7% | |
| .org | 87 | 3.4% | |
| .in | 74 | 2.9% | |
| .co.uk | 60 | 2.3% | |
| .net | 60 | 2.3% | |
| .de | 48 | 1.9% | |
| .io | 45 | 1.7% | |
| .com.au | 38 | 1.5% | |
| .co.za | 33 | 1.3% | |
| .com.br | 32 | 1.2% |
What Zoho ZeptoMail users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,581 domains.
| Type | Service | Domains | Share of Zoho ZeptoMail users |
|---|---|---|---|
| Mailbox | Google Workspace | 1,055 | 40.9% |
| Mailbox | Microsoft 365 | 870 | 33.7% |
| Mailbox | Self-Hosted | 128 | 5.0% |
| Mailbox | Zoho Mail | 97 | 3.8% |
| Mailbox | Unknown / Other | 70 | 2.7% |
| Mailbox | Mimecast | 46 | 1.8% |
| ESP | Zoho Campaigns | 769 | 29.8% |
| ESP | Amazon SES | 448 | 17.4% |
| ESP | Zoho Mail 360 | 321 | 12.4% |
| ESP | SendGrid (Twilio) | 277 | 10.7% |
Sender reputation and authentication rigour in the long tail
Because ZeptoMail attracts startups and SMBs, the service carries higher concentrations of newly-registered domains and lower sender volumes than tier-one ESPs. Mailbox providers and inbox operators monitor this segment carefully: a ZeptoMail SPF include often correlates with minimal sending history and smaller organisational footprint, neither inherently disqualifying nor credible. Senders on the platform should prioritise rigorous SPF, DKIM, and DMARC setup, consistent authentication across all sending infrastructure, prompt feedback-loop processing, and aggressive list hygiene. The reputation penalty for poor practices on ZeptoMail is sharper than for established senders on major platforms, precisely because the baseline expectation for authentication and list quality is higher in the long tail.
See the full Zoho ZeptoMail data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against Zoho ZeptoMail?
Yes, particularly if your recipient base includes SMBs, Google Workspace users, or organisations in emerging markets; ZeptoMail's presence is too common to ignore, though not as critical as testing major ISPs like Gmail or Microsoft. Include it as part of a geography- and business-type-representative sample.
How many domains use Zoho ZeptoMail?
2,581 domains in the Tranco top-1M use Zoho ZeptoMail as their email service provider (ESP) as of September 14, 2026 (0.40% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Zoho ZeptoMail common enough to affect email deliverability testing?
Zoho ZeptoMail accounts for 0.40% 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.
Is Zoho ZeptoMail growing or declining?
Zoho ZeptoMail has been stable — its share moved -0.01 pp over the last 30 days (as of September 14, 2026).
Which countries or TLDs use Zoho ZeptoMail most?
Zoho ZeptoMail's largest TLD is .com (59.7% of its domains); it appears across 168 TLDs in total.