Lark / Feishu (ByteDance) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Lark / Feishu (ByteDance) is the mailbox provider for 1,282 domains — 0.19% of 674,487 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 1,282 domains in the Tranco top-1M use Lark / Feishu (ByteDance) (0.19% of domains with MX records).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (56.6% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Zendesk.
- Directory category: mailbox provider.
Why Lark / Feishu (ByteDance) appears in this category
ByteDance collaboration suite incl. mailbox (Feishu in CN).
We classify it as a mailbox provider from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Lark is a unified collaboration platform owned by ByteDance, known as Feishu in mainland China, that combines messaging, calendar, document collaboration, and email functionality. When organisations adopt Lark, they can route incoming email through its infrastructure, establishing it as a mailbox provider within the broader email ecosystem.
In infrastructure terms, Lark occupies the long tail rather than the top tier—it appears far more often in smaller and mid-sized websites than in the largest global brands. Its footprint concentrates in the .com domain space, with particular prevalence among global and US-based organisations. Notably, Lark deployments frequently appear alongside other modern SaaS tools like Zendesk, indicating that its adoption correlates with organisations already committed to unified, software-as-a-service tooling.
Where Lark / Feishu (ByteDance) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 19 | 1.5% |
| Top 100,000 | 190 | 14.8% |
| Top 1,000,000 | 1,061 | 82.8% |
| Unranked | 12 | 0.9% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 726 | 56.6% | |
| .ai | 97 | 7.6% | |
| .cn | 52 | 4.1% | |
| .net | 40 | 3.1% | |
| .io | 36 | 2.8% | |
| .vn | 35 | 2.7% | |
| .org | 25 | 2.0% | |
| .id | 13 | 1.0% | |
| .me | 12 | 0.9% | |
| .app | 12 | 0.9% |
What Lark / Feishu (ByteDance) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,282 domains.
| Type | Service | Domains | Share of Lark / Feishu (ByteDance) users |
|---|---|---|---|
| ESP | Zendesk | 62 | 4.8% |
| ESP | Mailgun | 37 | 2.9% |
| ESP | Amazon SES | 32 | 2.5% |
| ESP | Alibaba DirectMail (APAC) | 10 | 0.8% |
| ESP | Alibaba DirectMail | 9 | 0.7% |
| ESP | SendGrid (Twilio) | 9 | 0.7% |
| ESP | Brevo (ex-Sendinblue) | 8 | 0.6% |
| ESP | MailerLite | 7 | 0.5% |
| ESP | HubSpot | 7 | 0.5% |
| ESP | SenderSRV | 6 | 0.5% |
Relevance for SaaS-Focused Sending Operations
For senders whose mail reaches small-to-mid-size organisations or companies operating within a contemporary SaaS ecosystem, Lark-hosted inboxes merit inclusion in email deliverability testing. Senders targeting large enterprises or consumer markets will encounter Lark less frequently and may prioritise testing against providers with broader distribution. Understanding Lark's user base helps senders tailor their testing strategy to their actual audience rather than testing against all providers uniformly.
See the full Lark / Feishu (ByteDance) data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
Why does Lark appear in deliverability research but seem less common than Gmail or Outlook?
Lark operates in the long tail of mail infrastructure, serving primarily small-to-mid-size organisations rather than the largest global brands. If you send to SaaS-heavy or enterprise-software audiences, Lark's prevalence in your recipient list may be much higher; conversely, for consumer or large-enterprise sends, it will appear less frequently.
How many domains use Lark / Feishu (ByteDance)?
1,282 domains in the Tranco top-1M use Lark / Feishu (ByteDance) as their mailbox provider as of September 14, 2026 (0.19% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Lark / Feishu (ByteDance) common enough to affect email deliverability testing?
Lark / Feishu (ByteDance) accounts for 0.19% of domains with MX records 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 Lark / Feishu (ByteDance) most?
Lark / Feishu (ByteDance)'s largest TLD is .com (56.6% of its domains); it appears across 100 TLDs in total.