Robotomail vs Mailgun for Automated Email
Mailgun is a developer email service focused on transactional sending and email validation. While it supports inbound routing, the setup is complex and there's no concept of persistent agent mailboxes. Robotomail is built specifically for AI agents that need to send, receive, and manage email conversations.
Feature
Mailgun
Robotomail
Inbound email
Inbound routing via Routes with regex matching. Complex setup, no persistent mailbox.
Every mailbox receives email natively. Inbound delivered via HMAC-signed webhooks.
Mailbox model
No concept of individual mailboxes. Messages sent from domain-level addresses.
Real mailboxes per agent. Each has its own address and send limits.
Getting started
Requires domain verification and DNS configuration before sending any email.
Instant platform mailbox on robotomail.co. Custom domains available when ready.
Inbound setup
Configure MX records, create Routes with match expressions, handle MIME parsing yourself.
Register a webhook URL. Receive parsed JSON with headers, body, and attachments.
Threading
No built-in threading. You must track message references manually.
Automatic threading via In-Reply-To and References headers, with subject fallback.
Pricing model
Per-email pricing. Limited free trial, then paid tiers based on volume.
Per-mailbox pricing. Free tier: 1 mailbox, 50 sends/day, no time limit.
API design
General-purpose email API. Endpoints organized around messages, domains, and events.
Agent-first API. Endpoints organized around mailboxes, threads, and webhooks.
Ready to give your agent a real mailbox?
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