ImprovMX offers first class email forwarding to your existing inbox, with additional advanced features1.
Postmark is a developer native email sending service for transactional and broadcast emails.
Choose Postmark if you need a fully featured API based email sending service. Choose ImprovMX if you need email forwarding and only need to do SMTP sending.
ImprovMX
Postmark
Pricing
Lower-cost fixed plans, scalable as you grow
Volume-based pricing, generally more expensive
Free Plan
Supports day-to-day domain forwarding
Best for testing due to low free tier limits[2]
Inbound Email
Native email forwarding and inbound webhooks
Only inbound webhooks
Advanced Forwarding
Webhook only; routing logic built in your app
Webhooks
Inbound email webhooks
Sending Volume
Monthly SMTP quotas per plan
Priced by monthly send volume
API
API manages domains, aliases and forwarding
API manages app email sending, tracking & delivery
CLI/MCP
Offers a CLI and an MCP server.
Email Send API
Not offered, but a send API is in progress
Offers a full REST sending API
Email Tracking
No open or click tracking
Full email engagement tracking
Email Templates
Not offered
Pre-built templates for transactional emails
Compliance
1. ImprovMX provides SMTP sending, rules routing, wildcard addresses, multiple recipient destinations, regex aliases and webhooks.
2. Postmark's free developer plan is capped at 100 emails per month, and they explicitly state no monthly overages are allowed on that plan so its mainly suitable for testing rather than real usage.
3. Postmark offers delivery, open, click, bounce, spam complaint, subscription change and SMTP API webhooks.
4. ImprovMX's CLI is built for terminal workflows, automation, and ai coding tools like Claude Code and OpenAI Codex.
Questions? Reach out to us, we love chatting about email service providers.
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