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Mailgun Provider needs option for EU server (domain is different) #12925

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#13027
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Mailgun Provider needs option for EU server (domain is different)#12925
#13027
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bugSomething isn't workingproviderstriageUnseen or unconfirmed by a maintainer yet. Provide extra information in the meantime.
@HexaCubist

Description

@HexaCubist
HexaCubist
opened on Apr 29, 2025

Provider type

Email

Environment

  System:
    OS: macOS 15.4.1
    CPU: (8) arm64 Apple M1
    Memory: 108.25 MB / 16.00 GB
    Shell: 4.0.1 - /opt/homebrew/bin/fish
  Binaries:
    Node: 20.15.1 - /usr/local/bin/node
    Yarn: 1.22.22 - /usr/local/bin/yarn
    npm: 10.7.0 - /usr/local/bin/npm
    bun: 1.2.4 - ~/.bun/bin/bun
  Browsers:
    Chrome: 135.0.7049.115
    Safari: 18.4
  npmPackages:
    @auth/drizzle-adapter: ^1.9.0 => 1.9.0 
    @auth/sveltekit: ^1.9.1 => 1.9.1

Reproduction URL

https://github.com/HexaCubist/next-auth-mailgun-eu

Describe the issue

Mailgun has two regions to send from since 2018: https://www.mailgun.com/about/regions/

API keys can be created for one region only, and the US region is hard-coded into the provider:

  • US Domain: api.mailgun.net
  • EU Domain: api.eu.mailgun.net

mailgun.ts:

...
      const res = await fetch(`https://api.mailgun.net/v3/${domain}/messages`, {
...

How to reproduce

  1. Clone repo
  2. Provide EU API keys for Mailgun
  3. Error:
[auth][error] Error: Mailgun error: Forbidden

Expected behavior

Mailgun provider should have configurable option to select region (EU or US), defaulting to the US.

Activity

HexaCubist
added
bugSomething isn't working
providers
triageUnseen or unconfirmed by a maintainer yet. Provide extra information in the meantime.
on Apr 29, 2025
HexaCubist

HexaCubist commented on Apr 29, 2025

@HexaCubist
HexaCubist
on Apr 29, 2025
Author

Related: #11923

benhovinga

benhovinga commented on Jun 3, 2025

@benhovinga
benhovinga
on Jun 3, 2025 · edited by benhovinga
Contributor

Possible solution to this issue. This follows a similar setup to the Microsoft Entra ID profilePhotoSize.

In packages/core/src/providers/mailgun.ts

export default function MailGun(
  config: EmailUserConfig & {
    /**
     * https://documentation.mailgun.com/docs/mailgun/api-reference/#base-url
     *
     * @default "US"
     */
    region?: "US" | "EU"
  }
): EmailConfig {
  const { region = "US" } = config
  const servers = {
    US: "api.mailgun.net",
    EU: "api.eu.mailgun.net",
  }
  const apiServer = servers[region]

// ...

const res = await fetch(`https://${apiServer}/v3/${domain}/messages`

// ...

When setting up the provider you would just need to include the region in the config

export const { handlers, auth, signIn, signOut } = NextAuth({
  providers: [
    Mailgun({
      region: "EU",  //  <-- HERE
      apiKey: process.env.AUTH_MAILGUN_KEY,
      from: "no-reply@company.com"
    }),
  ],
})
benhovinga
mentioned this on Jun 3, 2025
ThangHuuVu
closed this as completedin #13027on Jun 15, 2025
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        Mailgun Provider needs option for EU server (domain is different) · Issue #12925 · nextauthjs/next-auth