Updated · Volt Ghost team
Mailgun's inbound MX on listed domains
| MX host | Domains |
|---|---|
mxa.mailgun.org | 49 |
mxb.mailgun.org | 49 |
mxa.eu.mailgun.org | 1 |
mxb.eu.mailgun.org | 1 |
Every one of the 50 domains still answered with an MX record on 6 November 2026 (fresh DoH re-check of this group; 0 errors). The standard pair is mxa.mailgun.org plus mxb.mailgun.org; 1 domain used the .eu.mailgun.org pair instead.
| MX query, 6 Nov 2026 | Domains |
|---|---|
| MX record present | 50 (100%) |
When they were listed
| First listed | Domains | Gone by 6 Nov 2026 |
|---|---|---|
| 2018 or earlier | 22 | 0 (0%) |
| 2019 | 1 | 0 (0%) |
| 2021 | 13 | 0 (0%) |
| 2022 | 1 | 0 (0%) |
| 2023 | 5 | 0 (0%) |
| 2025 | 8 | 0 (0%) |
| Date | Change | Added |
|---|---|---|
| 9 November 2018 | Update disposable_email_blacklist.conf as disscused in #149 (e623c82) | 12 |
| 8 October 2018 | use neutral language for naming and describing assets in this repo (7448bb6) | 10 |
| 8 November 2021 | Add more 10minutemail domains (#289) (d929965) | 8 |
| 25 January 2025 | Update disposable_email_blocklist.conf (#555) (9646aed) | 5 |
| 28 April 2021 | Update disposable_email_blocklist.conf (#266) (32b9c8a) | 3 |
22 names date from the start of the list's Git history, and a noticeable 2021 cluster (13) matches upstream changes that added more short-lived mail domains. None of these 50 names are already fully listed on an S39 server page or an S40 month page, so the domain list below is complete for this group.
| Ending | Domains |
|---|---|
.com | 26 |
.net | 15 |
.org | 3 |
.online | 2 |
.pro | 1 |
.wtf | 1 |
API inboxes vs consumer temp mail
A Mailgun MX means mail is accepted by Mailgun and then routed by whatever the domain owner configured: a webhook, a store-and-forward rule, or an app inbox. Consumer services such as the ones in our best temp mail services comparison usually brand their own MX hosts; Mailgun-backed names look more like application domains, which is why they matter for temp email for testing and for abuse review alike.
For detection, start with the disposable email checker. If a domain is listed and its MX is Mailgun, you have both a list hit and a shared-infrastructure hint. If it is not listed, a Mailgun MX alone should not be enough to reject a sign-up; that is the same rule as for Cloudflare and Google on this family of pages, and the reason how sites detect disposable email puts list checks ahead of MX fingerprints.
Other forwarding and parking MX groups we have broken down: Cloudflare Email Routing, Google Workspace MX, Above.com parking.
Mailgun is an inbound email API used by apps to receive mail programmatically, not a consumer temp-mail brand. Domains that publish mxa.mailgun.org or mxb.mailgun.org (or the EU pair) are handing messages to that API. The 50 listed names here are disposable because they are on the list, not because Mailgun itself is a throwaway service.
Look up a domain
Look up one name to see if it receives mail through Mailgun, who hosts its email, or what its MX records say.
Questions
Is Mailgun a disposable email provider?
No. Mailgun sells sending and inbound email APIs to applications. Some disposable or catch-all services build their product on top of it, which is why listed domains can show Mailgun MX hosts.
How many listed domains use Mailgun?
50 on 6 November 2026. 49 use the US mxa/mxb.mailgun.org pair and 1 use the EU pair.
Can I detect temp mail by looking for mailgun.org in MX?
Only as a weak hint. Plenty of legitimate apps also receive mail through Mailgun. Pair the MX with a disposable-domain list check.
Why do testers care about this group?
Services built on an inbound API often expose many domains that all land in one backend. That pattern shows up in QA and in abuse reviews; see temp email for testing.
