AhaSend Email API & SMTP relay

npx add-mcp 'https://mcp.ahasend.com/mcp'

ahasend-mcp

A Go module with MCP tools for AhaSend. With these tools, an AI agent can send email, find out why an email failed, and manage domains, templates, contacts, lists, campaigns, webhooks, routes, suppressions, SMTP credentials and sub-accounts.

Each tool calls the AhaSend v2 API through ahasend-go. The API key's scopes decide what the agent can do.

The module builds a server with the official Go MCP SDK. Your program chooses how to serve it: stdio, HTTP, or any other SDK transport.

go get github.com/AhaSend/ahasend-mcp

Example

server, err := ahasendmcp.NewServer(
	&mcp.Implementation{Name: "my-app", Version: "1.0.0"},
	ahasendmcp.Options{
		Client:           api.NewAPIClient(api.WithAPIKey(apiKey)),
		AccountID:        accountID,
		DashboardBaseURL: "https://dash.ahasend.com",
		ConfirmationKey:  key, // at least 32 random bytes
	},
)
if err != nil {
	return err
}
return server.Run(ctx, &mcp.StdioTransport{})

Options

Field	What it does
Client	The ahasend-go client, with the API key. Required.
AccountID	The account the tools work on. Required.
DashboardBaseURL	The AhaSend dashboard URL, used in campaign links. Required.
ConfirmationKey	A secret of at least 32 bytes that signs campaign send questions. Required.
Scopes	The API key's scopes. Only tools the key can use are shown. nil shows every tool.
Toolsets	Show only these toolsets. nil shows all.
ReadOnly	Show only tools that change nothing.
Stateless	Set to true if you serve over stateless HTTP.
MaxRecipientsPerSend	The most recipients for one send. Default 50.
ReadInbound	Let the message tools return email the account received. Off by default.
Blocked	If set, every tool call returns this text as an error and does nothing.
Recorder	Gets one record per tool call: tool name, success, error kind and time taken. Never the inputs or results.

If you serve many users, build a new server for each request with that user's key and scopes. This is cheap. Use the same ConfirmationKey on every instance.

Catalogue() lists every tool with the scopes it needs. OfferedScopes() lists every scope the tools use, for a page where a user picks scopes.

Tools

Toolset	Tools
sending	send_email, send_conversation_email, send_template_email, cancel_scheduled_email
diagnostics	list_messages, get_message, diagnose_message, get_deliverability_stats, get_bounce_stats, get_delivery_time_stats
domains	list_domains, get_domain, add_domain, check_domain_dns, update_domain, delete_domain
templates	list_templates, get_template, get_published_template, create_template, update_template, delete_template, discard_template_draft, publish_template, list_template_versions, get_template_version, restore_template_version, list_campaign_templates, get_campaign_template, create_campaign_template, update_campaign_template, delete_campaign_template
audience	list_contacts, get_contact, create_contact, upsert_contacts, update_contact, delete_contact, list_contact_lists, list_lists, get_list, create_list, update_list, delete_list, list_list_contacts, add_contacts_to_list, upsert_list_contact, remove_contact_from_list, list_segments, get_segment, create_segment, update_segment, delete_segment, preview_segment, list_segment_contacts, list_contact_segments
campaigns	list_campaigns, get_campaign, create_campaign, update_campaign, delete_campaign, duplicate_campaign, send_campaign_test, send_campaign, schedule_campaign, unschedule_campaign, get_campaign_stats, list_campaign_recipients
management	get_account, list_webhooks, get_webhook, create_webhook, update_webhook, delete_webhook, list_routes, get_route, create_route, update_route, delete_route, list_suppressions, add_suppression, remove_suppression, list_smtp_credentials, get_smtp_credential, delete_smtp_credential, list_sub_accounts, get_sub_account, create_sub_account, update_sub_account, get_sub_account_usage

Each tool needs the scopes its API endpoint needs. send_campaign and schedule_campaign also need campaigns:read and lists:read, and segments:read to send a campaign that uses segments. The campaign template tools also need campaigns:read. preview_segment, list_segment_contacts and list_contact_segments need contacts:read as well as segments:read.

List tools return 20 items by default and at most 100. Pass the returned cursor to get the next page.

There are no tools to create API keys or SMTP credentials, change account settings, billing or team members, remove all suppressions, or delete or suspend sub-accounts.

Simple Editor designs and AhaML

The template, campaign template and campaign tools read and write a design of the dashboard's Simple Editor as AhaSend Markup (AhaML), an XML form of the design, in the content's markup field. get_template returns a template's working copy, the draft while one exists, so an agent edits what it read; get_published_template returns the copy a send uses.

The server has one resource, ahasend://docs/ahaml: the AhaML reference, with every tag, attribute, limit and error code. It is also at https://ahasend.com/docs/send-api/ahaml. The resource is listed on every connection, so an agent without web access can read it.

Safety rules

Campaign sends need a person's yes. send_campaign and schedule_campaign show the user a form with the send time, the number of contacts, the campaign name, subject, sender, lists and segments, and the excluded lists and segments. They send only if the user answers yes. If the campaign changes after the question, the tool asks again. If the client cannot show a form, the tool sends nothing and returns a link to the campaign in the dashboard.

One-off sends have a recipient limit. A single send to more than MaxRecipientsPerSend recipients (default 50) is refused. Use a campaign for bulk email.

Received email is hidden by default. Anyone can send email to an account's inbound addresses, and that email can contain text that tries to trick the agent. Unless ReadInbound is on, the message tools do not return received email. When it is on, received messages are marked untrusted: true.

Errors

When the API refuses a call, the tool returns an error with the API's message and what to do next. When it refuses AhaML, the error lists the problems, up to the first 100, each with its code, line, column, path and hint; the API's message gives how many there are.

Trying it locally

cmd/ahasend-mcp-dev serves every tool over stdio with your own API key. It is for testing only.

go build -o ahasend-mcp-dev ./cmd/ahasend-mcp-dev
claude mcp add ahasend \
  -e AHASEND_API_KEY=... -e AHASEND_ACCOUNT_ID=... \
  -- ./ahasend-mcp-dev

Set AHASEND_BASE_URL to use an API other than the default.

License

MIT