simstudioai · waleedlatif1 · Sep 29, 2026 · Sep 29, 2026
diff --git a/apps/docs/content/docs/integrations/mailgun.mdx b/apps/docs/content/docs/integrations/mailgun.mdx
@@ -32,6 +32,7 @@ Send an email using Mailgun API
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `domain` | string | Yes | Mailgun sending domain \(e.g., mg.example.com\) |
 | `from` | string | Yes | Sender email address \(e.g., sender@example.com or "Name &lt;sender@example.com&gt;"\) |
 | `to` | string | Yes | Recipient email address \(e.g., user@example.com\). Use comma-separated values for multiple recipients |
@@ -59,6 +60,7 @@ Retrieve a stored message by its key
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `domain` | string | Yes | Mailgun domain for retrieving messages \(e.g., mg.example.com\) |
 | `messageKey` | string | Yes | Message storage key |
 
@@ -89,6 +91,7 @@ List events (logs) for messages sent through Mailgun
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `domain` | string | Yes | Mailgun domain for listing events \(e.g., mg.example.com\) |
 | `event` | string | No | Filter by event type \(accepted, delivered, failed, opened, clicked, etc.\) |
 | `limit` | number | No | Maximum number of events to return \(default: 100\) |
@@ -110,6 +113,7 @@ Create a new mailing list
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `address` | string | Yes | Mailing list address \(e.g., newsletter@mg.example.com\) |
 | `name` | string | No | Mailing list name |
 | `description` | string | No | Mailing list description |
@@ -132,6 +136,7 @@ Get details of a mailing list
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `address` | string | Yes | Mailing list address to retrieve \(e.g., newsletter@mg.example.com\) |
 
 #### Output
@@ -150,6 +155,7 @@ Add a member to a mailing list
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `listAddress` | string | Yes | Mailing list address \(e.g., list@mg.example.com\) |
 | `address` | string | Yes | Member email address to add \(e.g., user@example.com\) |
 | `name` | string | No | Member name |
@@ -173,6 +179,7 @@ List all domains for your Mailgun account
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 
 #### Output
 
@@ -191,6 +198,7 @@ Get details of a specific domain
 | Parameter | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
 | `apiKey` | string | Yes | Mailgun API key |
+| `region` | string | No | Mailgun account region: "us" \(default\) or "eu" |
 | `domain` | string | Yes | Domain name to retrieve details for \(e.g., mg.example.com\) |
 
 #### Output

diff --git a/apps/sim/blocks/blocks/mailgun.ts b/apps/sim/blocks/blocks/mailgun.ts
@@ -70,6 +70,16 @@ export const MailgunBlock: BlockConfig<SendMessageResult> = {
       placeholder: 'Enter your Mailgun API key',
       required: true,
     },
+    {
+      id: 'region',
+      title: 'Region',
+      type: 'dropdown',
+      options: [
+        { label: 'US', id: 'us' },
+        { label: 'EU', id: 'eu' },
+      ],
+      value: () => 'us',
+    },
     {
       id: 'domain',
       title: 'Domain',
@@ -405,6 +415,7 @@ Return ONLY the JSON object - no explanations or markdown.`,
   inputs: {
     operation: { type: 'string', description: 'Operation to perform' },
     apiKey: { type: 'string', description: 'Mailgun API key' },
+    region: { type: 'string', description: 'Mailgun account region: "us" or "eu"' },
     domain: { type: 'string', description: 'Mailgun domain' },
     // Message inputs
     from: { type: 'string', description: 'Sender email address' },

diff --git a/apps/sim/tools/generated/tool-metadata.ts b/apps/sim/tools/generated/tool-metadata.ts
diff --git a/apps/sim/tools/mailgun/add_list_member.ts b/apps/sim/tools/mailgun/add_list_member.ts
@@ -1,4 +1,5 @@
 import type { AddListMemberParams, AddListMemberResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunAddListMemberTool: ToolConfig<AddListMemberParams, AddListMemberResult> = {
@@ -14,6 +15,12 @@ export const mailgunAddListMemberTool: ToolConfig<AddListMemberParams, AddListMe
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     listAddress: {
       type: 'string',
       required: true,
@@ -47,7 +54,7 @@ export const mailgunAddListMemberTool: ToolConfig<AddListMemberParams, AddListMe
   },
 
   request: {
-    url: (params) => `https://api.mailgun.net/v3/lists/${params.listAddress}/members`,
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/lists/${params.listAddress}/members`,
     method: 'POST',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/create_mailing_list.ts b/apps/sim/tools/mailgun/create_mailing_list.ts
@@ -1,4 +1,5 @@
 import type { CreateMailingListParams, CreateMailingListResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunCreateMailingListTool: ToolConfig<
@@ -17,6 +18,12 @@ export const mailgunCreateMailingListTool: ToolConfig<
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     address: {
       type: 'string',
       required: true,
@@ -44,7 +51,7 @@ export const mailgunCreateMailingListTool: ToolConfig<
   },
 
   request: {
-    url: () => 'https://api.mailgun.net/v3/lists',
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/lists`,
     method: 'POST',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/get_domain.ts b/apps/sim/tools/mailgun/get_domain.ts
@@ -1,4 +1,5 @@
 import type { GetDomainParams, GetDomainResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunGetDomainTool: ToolConfig<GetDomainParams, GetDomainResult> = {
@@ -14,6 +15,12 @@ export const mailgunGetDomainTool: ToolConfig<GetDomainParams, GetDomainResult>
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     domain: {
       type: 'string',
       required: true,
@@ -23,7 +30,7 @@ export const mailgunGetDomainTool: ToolConfig<GetDomainParams, GetDomainResult>
   },
 
   request: {
-    url: (params) => `https://api.mailgun.net/v3/domains/${params.domain}`,
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/domains/${params.domain}`,
     method: 'GET',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/get_mailing_list.ts b/apps/sim/tools/mailgun/get_mailing_list.ts
@@ -1,4 +1,5 @@
 import type { GetMailingListParams, GetMailingListResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunGetMailingListTool: ToolConfig<GetMailingListParams, GetMailingListResult> = {
@@ -14,6 +15,12 @@ export const mailgunGetMailingListTool: ToolConfig<GetMailingListParams, GetMail
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     address: {
       type: 'string',
       required: true,
@@ -23,7 +30,7 @@ export const mailgunGetMailingListTool: ToolConfig<GetMailingListParams, GetMail
   },
 
   request: {
-    url: (params) => `https://api.mailgun.net/v3/lists/${params.address}`,
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/lists/${params.address}`,
     method: 'GET',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/get_message.ts b/apps/sim/tools/mailgun/get_message.ts
@@ -1,4 +1,5 @@
 import type { GetMessageParams, GetMessageResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunGetMessageTool: ToolConfig<GetMessageParams, GetMessageResult> = {
@@ -14,6 +15,12 @@ export const mailgunGetMessageTool: ToolConfig<GetMessageParams, GetMessageResul
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     domain: {
       type: 'string',
       required: true,
@@ -30,7 +37,7 @@ export const mailgunGetMessageTool: ToolConfig<GetMessageParams, GetMessageResul
 
   request: {
     url: (params) =>
-      `https://api.mailgun.net/v3/domains/${params.domain}/messages/${params.messageKey}`,
+      `${getMailgunApiBaseUrl(params.region)}/domains/${params.domain}/messages/${params.messageKey}`,
     method: 'GET',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/list_domains.ts b/apps/sim/tools/mailgun/list_domains.ts
@@ -1,4 +1,5 @@
 import type { ListDomainsParams, ListDomainsResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunListDomainsTool: ToolConfig<ListDomainsParams, ListDomainsResult> = {
@@ -14,10 +15,16 @@ export const mailgunListDomainsTool: ToolConfig<ListDomainsParams, ListDomainsRe
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
   },
 
   request: {
-    url: () => 'https://api.mailgun.net/v3/domains',
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/domains`,
     method: 'GET',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,

diff --git a/apps/sim/tools/mailgun/list_messages.ts b/apps/sim/tools/mailgun/list_messages.ts
@@ -1,4 +1,5 @@
 import type { ListMessagesParams, ListMessagesResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunListMessagesTool: ToolConfig<ListMessagesParams, ListMessagesResult> = {
@@ -14,6 +15,12 @@ export const mailgunListMessagesTool: ToolConfig<ListMessagesParams, ListMessage
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     domain: {
       type: 'string',
       required: true,
@@ -36,7 +43,7 @@ export const mailgunListMessagesTool: ToolConfig<ListMessagesParams, ListMessage
 
   request: {
     url: (params) => {
-      const baseUrl = `https://api.mailgun.net/v3/${params.domain}/events`
+      const baseUrl = `${getMailgunApiBaseUrl(params.region)}/${params.domain}/events`
       const queryParams = new URLSearchParams()
 
       if (params.event) {

diff --git a/apps/sim/tools/mailgun/send_message.ts b/apps/sim/tools/mailgun/send_message.ts
@@ -1,4 +1,5 @@
 import type { SendMessageParams, SendMessageResult } from '@/tools/mailgun/types'
+import { getMailgunApiBaseUrl } from '@/tools/mailgun/utils'
 import type { ToolConfig } from '@/tools/types'
 
 export const mailgunSendMessageTool: ToolConfig<SendMessageParams, SendMessageResult> = {
@@ -14,6 +15,12 @@ export const mailgunSendMessageTool: ToolConfig<SendMessageParams, SendMessageRe
       visibility: 'user-only',
       description: 'Mailgun API key',
     },
+    region: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Mailgun account region: "us" (default) or "eu"',
+    },
     domain: {
       type: 'string',
       required: true,
@@ -74,7 +81,7 @@ export const mailgunSendMessageTool: ToolConfig<SendMessageParams, SendMessageRe
   },
 
   request: {
-    url: (params) => `https://api.mailgun.net/v3/${params.domain}/messages`,
+    url: (params) => `${getMailgunApiBaseUrl(params.region)}/${params.domain}/messages`,
     method: 'POST',
     headers: (params) => ({
       Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,