Mailendo email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 19, 2026), Mailendo is the email service provider (ESP) for 884 domains — 0.14% of 642,799 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 884 domains in the Tranco top-1M use Mailendo (0.14% of SPF-publishing domains).
- Snapshot date: 2026-09-19 — recomputed every day.
- Strongest TLD: .com (39.9% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email service provider.
Why Mailendo appears in this category
Polish marketing email platform.
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.
Mailendo is an email service provider that handles email delivery for websites, operating as a delegated SMTP relay identified in email infrastructure audits through SPF include mechanisms published by its customers.
Mailendo's customer base is concentrated among smaller and mid-market websites across international markets, predominantly on dot-com domains and often deployed alongside Google Workspace. This distribution means Mailendo's reputation is shaped by a broad but dispersed set of senders. For both senders and receivers, Mailendo's filtering status and IP reputation thus affect a diverse, internationally-distributed customer base rather than a small number of large platforms.
Where Mailendo sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 3 | 0.3% |
| Top 100,000 | 117 | 13.2% |
| Top 1,000,000 | 750 | 84.8% |
| Unranked | 14 | 1.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 353 | 39.9% | |
| .gr | 318 | 36.0% | |
| .org | 27 | 3.1% | |
| .co.uk | 22 | 2.5% | |
| .net | 11 | 1.2% | |
| .cy | 8 | 0.9% | |
| .eu | 8 | 0.9% | |
| .ro | 7 | 0.8% | |
| .edu | 7 | 0.8% | |
| .com.au | 6 | 0.7% |
What Mailendo users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 884 domains.
| Type | Service | Domains | Share of Mailendo users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 282 | 31.9% |
| Mailbox | Google Workspace | 259 | 29.3% |
| Mailbox | Self-Hosted | 154 | 17.4% |
| Mailbox | Unknown / Other | 40 | 4.5% |
| Mailbox | Proofpoint | 15 | 1.7% |
| Mailbox | Mimecast | 12 | 1.4% |
| ESP | Mailchimp | 83 | 9.4% |
| ESP | Amazon SES | 66 | 7.5% |
| ESP | Mandrill | 65 | 7.4% |
| ESP | ContactPigeon | 59 | 6.7% |
Shared reputation risk via SPF delegation
When a domain publishes Mailendo in its SPF record, that domain authorises Mailendo's infrastructure to send email on its behalf. Because Mailendo operates shared IP pools for multiple customers, poor sending practices by any customer—low list quality, compliance violations, or high complaint rates—can degrade those pools' reputation and impact deliverability for all customers sharing them. Responsible compliance across Mailendo's customer base protects shared reputation; conversely, concentrated bad-sending behaviour from a single customer can briefly affect others on the same infrastructure.
See the full Mailendo data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against Mailendo?
If your recipient population includes addresses from domains relying on Mailendo as their mail relay, testing with a Mailendo-originated sender is prudent. Otherwise, prioritise testing against the larger ESP platforms that account for a greater share of your recipient base.
How many domains use Mailendo?
884 domains in the Tranco top-1M use Mailendo as their email service provider (ESP) as of September 19, 2026 (0.14% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Mailendo common enough to affect email deliverability testing?
Mailendo accounts for 0.14% 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 Mailendo most?
Mailendo's largest TLD is .com (39.9% of its domains); it appears across 74 TLDs in total.