Postmark Extended MCP Server

Your AI agent hooks into Postmark's entire system, handling everything from sending transactional emails to keeping your domains running smooth. This server gives you access to a massive set of tools that let you manage email delivery and infrastructure without ever having to log into the dashboard.

Sending Mail (The Basics)

When you need to send an email—whether it's a single alert or a huge campaign—you got options. You can use send_email for one-off sends, but if you're dealing with volume, you should hit up send_batch_emails or send_bulk_emails. For templated communication, use send_email_with_template, which populates variables into an existing template and delivers the message.

You can also send emails by passing a fully formed body directly through send_email.

Content Management and Testing (Templates & Signatures)

You don't just send content; you manage it first. To build new messages, use create_template, which lets you save brand-new email templates. After you write a template, always check its syntax with validate_template before hitting send—it catches errors immediately. If you need to modify an existing message body or variables, you'll run edit_template.

You can also pull up existing content using list_templates and get the full details of a template with get_template, or list all available signatures via list_sender_signatures to retrieve them fully with get_sender_signature. If you gotta tweak that signature, use edit_sender_signature; otherwise, you can delete it with delete_sender_signature. For the templates themselves, you've got list_templates and delete_template if you need to clean house.

Tracking Performance (The Analytics)

This server lets your agent track what happens after the email leaves. To see overall delivery metrics, run get_outbound_stats. For specific failures, you can get total bounce counts with get_outbound_bounces_stats and search historical records using search_bounces. You can also dive deep into a single failure by calling get_bounce, which retrieves detailed info for one bounce event, or grab the raw SMTP data dump via get_bounce_dump.

For open tracking, you can get total opens with get_outbound_opens_stats, count views broken down by specific client like Gmail using get_outbound_opens_clients_stats, or see counts grouped by the platform used to view it through get_outbound_opens_platforms_stats. To track link clicks, use search_outbound_clicks for historical searches. You can get a high-level count of successful sends with get_outbound_sends_stats, and if you need to know how many times links were clicked in bulk, check get_outbound_clicks_stats.

If your emails get flagged as spam, get_outbound_spam_stats tells you the total complaint count.

Infrastructure Management (Domains & Streams)

You gotta manage the backend stuff. To add a new domain to your account level, use add_domain; if it's time to ditch one, run delete_domain. You can also change an existing domain using edit_domain, or generate and apply new DKIM keys by calling rotate_domain_dkim. To check a domain's details, use get_domain or list every domain with list_domains.

For tracking specific communication channels, you can set up a dedicated message stream using create_message_stream, and if you need to see what streams are running, call list_message_streams. You can update a stream's details with edit_message_stream or restore it if you archived it using unarchive_message_stream. When setting up communication flow, you can also manage suppressions by calling create_suppressions (up to 50) and listing them with list_suppressions, or removing them entirely with delete_suppressions.

For webhooks, use create_webhook to set up an outgoing notification endpoint; you can then update it with edit_webhook or grab all details using get_webhook, and list every configured webhook endpoint with list_webhooks.

Advanced Flow Control (Servers & Messages)

To handle servers, use create_server to make a new instance at the account level, or view current settings via get_current_server and list all configured servers with list_servers. If you need to modify an active server's general settings, run edit_server, or change specific details of the currently running one using edit_current_server.

For inbound messages, your agent can get full headers for a message sent to your address with get_inbound_message_details, and if something failed coming in, you can try processing it again by calling retry_inbound_message or searching for past ones using search_inbound_messages. You also have the option of creating a server instance via create_server and deleting it with delete_server.

Data & Compliance Tools

When you gotta deal with data removal requests (like GDPR/CCPA), start the process by calling request_data_removal, and then check its status using get_data_removal_status. If a message stream was archived, use archive_message_stream to store it, or restore it with unarchive_message_stream. Finally, you can also run get_server to pull all configuration settings for the active server instance.