Mailgun (inbound) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Mailgun (inbound) is the mailbox provider for 2,139 domains — 0.32% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 2,139 domains in the Tranco top-1M use Mailgun (inbound) (0.32% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- 30-day share change: -0.02 pp.
- Strongest TLD: .com (48.7% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Mailgun.
- Directory category: email service provider.
Why Mailgun (inbound) appears in this category
Mailgun inbound routing API for receiving.
We classify it as a email service 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.
Mailgun is an email platform operated by Twilio. Mailgun (inbound) refers to their mail-receiving service, where a domain's primary MX record routes all inbound mail through Mailgun's infrastructure rather than hosting mail in-house.
Mailgun inbound is concentrated among smaller and medium-sized sites—the long tail rather than the largest brands—predominantly in the .com space, with a global footprint skewed toward the United States. For senders, this means deliverability to Mailgun inbound recipients is relatively common when targeting SMBs. For domains using Mailgun inbound, the choice does not exempt them from sender authentication requirements; each domain remains responsible for its own SPF, DKIM, and filtering configuration.
Where Mailgun (inbound) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 3 | 0.1% |
| Top 10,000 | 34 | 1.6% |
| Top 100,000 | 241 | 11.3% |
| Top 1,000,000 | 1,848 | 86.4% |
| Unranked | 13 | 0.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,042 | 48.7% | |
| .org | 142 | 6.6% | |
| .net | 126 | 5.9% | |
| .io | 95 | 4.4% | |
| .app | 35 | 1.6% | |
| .co.uk | 30 | 1.4% | |
| .de | 29 | 1.4% | |
| .co | 28 | 1.3% | |
| .jp | 19 | 0.9% | |
| .com.br | 19 | 0.9% |
What Mailgun (inbound) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,139 domains.
| Type | Service | Domains | Share of Mailgun (inbound) users |
|---|---|---|---|
| ESP | Mailgun | 1,938 | 90.6% |
| ESP | Amazon SES | 62 | 2.9% |
| ESP | Zendesk | 49 | 2.3% |
| ESP | SendGrid (Twilio) | 39 | 1.8% |
| ESP | Mandrill | 37 | 1.7% |
| ESP | Mailchimp | 34 | 1.6% |
| ESP | Mailjet (Sinch) | 28 | 1.3% |
| ESP | Elastic Email | 20 | 0.9% |
| ESP | Help Scout | 17 | 0.8% |
| ESP | Campaign Monitor | 16 | 0.7% |
MX reputation and sender trust
Mailgun inbound is shared infrastructure: multiple customer domains use the same MX records. Each domain's email policies—SPF, DKIM, DMARC—must still be configured correctly for secure receipt and authentication. Senders reaching Mailgun inbound–backed recipients should expect those domains to validate inbound mail against published authentication records, as any mailbox provider would. Mailgun's own reputation as a mail router is separate from individual domains' reputations; misbehaviour by one Mailgun customer does not blacklist another, but the platform's general standing does affect overall mail-flow stability.
See the full Mailgun (inbound) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability specifically against Mailgun inbound?
Mailgun inbound is a mail receiver, not a sender service; testing means verifying that mail reaches domains using Mailgun as their MX. If a substantial proportion of your recipients are SMBs in the .com space, testing delivery to at least one Mailgun inbound–backed domain is prudent, though it should not replace testing against established ISPs or consumer mailboxes.
How many domains use Mailgun (inbound)?
2,139 domains in the Tranco top-1M use Mailgun (inbound) as their mailbox provider as of September 12, 2026 (0.32% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Mailgun (inbound) common enough to affect email deliverability testing?
Mailgun (inbound) accounts for 0.32% 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.
Is Mailgun (inbound) growing or declining?
Mailgun (inbound) is declining — its share moved -0.02 pp over the last 30 days (as of September 12, 2026).
Which countries or TLDs use Mailgun (inbound) most?
Mailgun (inbound)'s largest TLD is .com (48.7% of its domains); it appears across 191 TLDs in total.