According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Mailgun (inbound) is the mailbox provider for 2,281 domains — 0.35% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 3 | 0.1% |
| Top 10,000 | 35 | 1.5% |
| Top 100,000 | 268 | 11.7% |
| Top 1,000,000 | 1,638 | 71.8% |
| Unranked | 337 | 14.8% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,147 | 50.3% | |
| .org | 145 | 6.4% | |
| .net | 131 | 5.7% | |
| .io | 102 | 4.5% | |
| .co.uk | 37 | 1.6% | |
| .app | 37 | 1.6% | |
| .co | 30 | 1.3% | |
| .de | 27 | 1.2% | |
| .me | 23 | 1.0% | |
| .nl | 22 | 1.0% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,281 domains.
| Type | Service | Domains | Share of Mailgun (inbound) users |
|---|---|---|---|
| ESP | Mailgun | 2,062 | 90.4% |
| ESP | Amazon SES | 62 | 2.7% |
| ESP | Zendesk | 54 | 2.4% |
| ESP | Mailchimp | 43 | 1.9% |
| ESP | SendGrid (Twilio) | 43 | 1.9% |
| ESP | Mandrill | 41 | 1.8% |
| ESP | Mailjet (Sinch) | 30 | 1.3% |
| ESP | Campaign Monitor | 27 | 1.2% |
| ESP | Help Scout | 21 | 0.9% |
| ESP | MailerSend | 18 | 0.8% |
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) →
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.
2,281 domains in the Tranco top-1M use Mailgun (inbound) as their mailbox provider as of July 13, 2026 (0.35% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Mailgun (inbound) accounts for 0.35% 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.
Mailgun (inbound) has been stable — its share moved -0.00 pp over the last 30 days (as of July 13, 2026).
Mailgun (inbound)'s largest TLD is .com (50.3% of its domains); it appears across 189 TLDs in total.