Add bounce, suppression, and stats management tools

[stucchi]

Summary

• 8 new tools for managing bounces, suppressions, and delivery statistics:
  • getBounces, getBounce, activateBounce — list, inspect, and reactivate bounced addresses
  • getSuppressions, createSuppressions, deleteSuppressions — manage suppressed addresses
  • getBounceStats, getSpamStats — daily bounce and spam complaint statistics
• Added server.json and mcpName in package.json for MCP Registry publishing readiness
• Updated README with full documentation for all new tools

Motivation

The current server only supports sending emails and listing templates. In practice, managing bounces and suppressions is essential — for example, reactivating recipients blocked due to temporary mail server issues, or reviewing spam complaints. These tools wrap the existing Postmark Bounce API, Suppressions API, and Stats API.

MCP Registry

A server.json file is included with namespace io.github.activecampaign/postmark, ready for publishing via mcp-publisher. See the MCP Registry Quickstart for details.

Test plan

• Verify getBounces returns bounce list with filters (type, email, date range)
• Verify getBounce returns detailed bounce info for a given ID
• Verify activateBounce reactivates a blocked recipient
• Verify getSuppressions lists suppressed addresses per stream
• Verify createSuppressions suppresses given email addresses
• Verify deleteSuppressions removes suppressions
• Verify getBounceStats and getSpamStats return daily breakdowns
• Verify existing tools (sendEmail, sendEmailWithTemplate, listTemplates, getDeliveryStats) are unaffected

[dandigangi]

Thanks for contributing! The team and myself are reviewing!