Mailgun MCP Integration

Weldable's Mailgun MCP integration connects your AI agents to Mailgun's transactional email API. Built for developers, Mailgun handles email sending, receiving, routing, and validation with a focus on deliverability and detailed analytics. Weldable gives your agents the ability to send emails, manage mailing lists, track delivery events, and validate addresses through natural language commands, with API authentication managed automatically.

Your agent can send messages via API or SMTP, manage mailing list subscribers, query delivery logs and event data, and validate email addresses. Describe what you need and Weldable maps your intent to the correct Mailgun API endpoint.

Use cases

Transactional email delivery with event tracking

Your agent sends transactional emails through Mailgun when application events occur: account verification, order confirmation, or payment receipt. After sending, it can query Mailgun's events API to confirm delivery status, check for bounces, and retry failed sends. Pair this with a Slack alert when a critical email bounces so your support team can follow up through another channel.

Inbound email processing

Mailgun can receive incoming emails and route them to your application via webhooks. Your agent processes these inbound messages, extracting sender information, subject lines, and body content. Use this for support ticket creation: when a customer emails support@yourdomain.com, your agent reads the message through Mailgun, creates a ticket in your CRM, and sends an acknowledgment reply.

Email address validation before outreach

Before your agent sends a campaign or adds contacts to a mailing list, it validates email addresses through Mailgun's validation API. This checks for syntax errors, disposable email providers, and mailbox existence. Filtering out invalid addresses before sending protects your domain reputation and reduces bounce rates on every campaign.

Mailing list management

Your agent manages Mailgun mailing lists by adding subscribers from your CRM or Google Sheets, removing unsubscribed contacts, and updating member attributes. When a user changes their preferences in your application, the agent updates their mailing list membership accordingly. This keeps your Mailgun lists synchronized with your application's user data.

Delivery analytics and domain health monitoring

Your agent queries Mailgun's statistics API to pull delivery rates, bounce rates, complaint rates, and click tracking data across your sending domains. It compiles a daily or weekly health report, flags domains with rising bounce rates, and posts the summary to Slack. Catching deliverability issues early prevents small problems from escalating into blocklisted domains.

How it works

Connect your Mailgun account through Weldable's authentication flow. Your agent uses Mailgun's API with credentials that Weldable stores securely and manages on your behalf. Natural language commands get translated into the correct API calls, with domain selection, endpoint resolution, and parameter formatting handled automatically.

Once connected, your agent can send emails, manage mailing lists, validate addresses, query events, and pull delivery statistics. Chain Mailgun operations with other connected services to build workflows that combine email delivery with your CRM, support tools, and analytics platforms.

Tips

Send from verified domains only. Mailgun requires domain verification with DNS records (SPF, DKIM, DMARC) before sending. Make sure your sending domains are verified in Mailgun before your agent attempts to send from them. Unverified domains will cause API errors.

Use Mailgun's event polling for delivery confirmation. After sending an email, your agent can query the events API to check whether the message was delivered, opened, or bounced. This is especially useful for critical transactional emails where you need confirmation that the message reached the recipient.

Validate addresses in bulk before imports. Mailgun's batch validation API can check large lists of addresses at once. When your agent imports contacts from a Google Sheet or CRM export, run validation first to remove invalid addresses and avoid a spike in bounces on your next send.

Separate sending domains by email type. Use different Mailgun domains for transactional and marketing email. If marketing sends cause reputation damage on one domain, your transactional emails continue delivering from a clean domain with an unaffected reputation.

Tag messages for granular analytics. Mailgun supports custom tags on messages. Have your agent apply tags like "onboarding," "billing," or "weekly-digest" when sending so your analytics reports show performance by email category rather than a single aggregate view.