AI
How to Let AI Agents Send Email (Safely)
Giving an agent a send button is easy. Giving it one you won’t regret takes a few deliberate constraints.
MailCraft Team · June 12, 2026 · 6 min read
"Can my AI agent send email?" is the wrong first question. The right one is "what’s the worst plausible thing it could send, to how many people, and how fast could I find out?" Answer that, and the safety design mostly falls out on its own.
Scope the API key to the job
Every agent should get its own API key, scoped to only the resources it needs. An agent that drafts campaigns doesn’t need permission to manage API keys or delete sending domains. MailCraft API keys carry explicit scopes for exactly this reason — treat an agent’s key the way you’d treat a junior teammate’s access, not your own.
Separate "draft" from "send"
The single highest-leverage guardrail is a hard separation between the tool that creates a draft and the tool (or button) that actually sends. An agent can be given full creative freedom to draft, segment, and schedule — as long as "schedule" defaults to a future time that a human confirms, rather than "send now."
Rate-limit and cap by volume, not just by time
Put a hard ceiling on how many recipients any single agent-initiated send can reach without additional approval — say, 50 contacts for full autonomy, anything above that requires a human sign-off regardless of how confident the agent is. This bounds the blast radius of a bad draft to something recoverable.
Log everything, and make the log visible
Every send, draft, and API call an agent makes should be attributable to that agent’s key in your logs — not lumped in with human activity. When something looks off, you want to answer "what did the agent do in the last hour" in seconds, not by reconstructing it from support tickets.
Test the failure mode before you need to
Before turning an agent loose on anything customer-facing, deliberately try to get it to do the wrong thing in a staging environment: ask it to email a list it shouldn’t have access to, ask it to send immediately when it should draft, ask it a leading question designed to produce an off-brand message. If it fails safely in staging, you’ve found the edge of its guardrails before a real contact does.
Put it into practice
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