Can AI agents send email safely?
Yes, but sending is an authority problem, not only an API integration. The application must decide who the agent represents and which messages it may send.
AI agents can send email safely in bounded workflows when they use a dedicated identity, a credential that cannot administer unrelated mailboxes, approved recipient and purpose rules, deterministic templates or constrained drafts, rate and volume limits, sensitive-data checks, human review for consequential or ambiguous messages, delivery observability, and a fast pause or revocation path. Do not give an experimental agent permanent sending authority merely because it successfully received a verification email.
Workflow at a glance
Use a reviewable outbound state machine
- 01Create a draft
Record purpose, source workflow, intended recipient, and supporting data.
- 02Run deterministic checks
Validate identity, recipient, content, attachment, and limits.
- 03Approve when required
Capture the reviewed artifact and approving principal.
- 04Send and observe
Keep provider request, acceptance, delivery, and response as distinct states.
Enforce policy in code around the model
- Allow only approved sender identities and recipient domains or records.
- Use templates or constrained fields for routine transactional messages.
- Block secrets, mailbox credentials, private thread content, and unsupported attachments.
- Apply per-mailbox and per-workflow rate limits and daily caps.
- Require approval for new recipients, commitments, sensitive data, and high-impact content.
Use a reviewable outbound state machine
-
01
Create a draft
Record purpose, source workflow, intended recipient, and supporting data.
-
02
Run deterministic checks
Validate identity, recipient, content, attachment, and limits.
-
03
Approve when required
Capture the reviewed artifact and approving principal.
-
04
Send and observe
Keep provider request, acceptance, delivery, and response as distinct states.
Make one mailbox easy to stop
| Problem | Immediate action | Evidence to keep |
|---|---|---|
| Unexpected recipients | Pause sending for the mailbox | Draft, policy result, and provider request ID |
| Credential exposure | Rotate the scoped key | Affected callers and effective time |
| Content policy failure | Cancel pending sends and tighten rule | Redacted message version and approval state |
| Provider rejection spike | Stop retries and inspect cause | Acceptance and bounce events |
Sources and product scope
Product behavior is verified against the mails0 source and documentation. External comparisons link to official vendor documentation checked on 2026-08-15.
- mails0 source repositoryImplementation, license, and deployment source
- mails0 authentication documentationCredential and mailbox scope
Related questions
Should every agent email require human approval?
Not every low-risk deterministic message needs manual review, but consequential, ambiguous, sensitive, or new-recipient communication should have an explicit approval gate.
Is a send API key enough to control an agent?
No. The application also needs sender and recipient policy, content checks, limits, approval, observability, and revocation.
When should a receive-only agent gain sending access?
After the inbound workflow shows recurring value, an owner accepts external representation, and the team implements the send controls and stop path.
Prove the smallest useful email loop.
Start with one scoped inbox and one expected message. Add durable identity, sending, and operational complexity only when the first loop works.