Mailsac APIs for AI Agents
CommunicationsEmail DeliveryJentic-Generated SpecsAPI keyAgent Ready
Mailsac API Catalog
2 APIs across 1 product group. All share one credential.
Communications2
mailsac API SpecificationDrive disposable and reserved Mailsac inboxes at scale: bulk-reserve addresses, fetch messages with attachments, manage owned domains, and receive inbound webhooks.~47 endpointsMailsac APIReserve disposable email addresses, fetch incoming messages, and subscribe to inbound-mail webhooks for automated email testing.~16 endpoints
Which Mailsac API should I use?
| I want to... | Use | Why |
|---|---|---|
| Read messages and register webhooks on a single reserved inbox | Mailsac API | The 16-endpoint spec covers the core fetch, validate, and webhook surface for verifying sign-up, reset, and OTP flows without extra operations. |
| Bulk-reserve addresses, manage owned domains, or download attachments | mailsac API Specification | The 47-endpoint spec adds bulk address reservation, bulk validation, domain ownership, attachment-by-content-ID download, and websocket streams for high-volume QA. |
Install Jentic One Beta
Connect the Mailsac APIs to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Mailsac APIs, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmailsac.com" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmailsac.com" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Once connected, ask your agent something like: “reserve disposable email inboxes and read incoming messages for testing”.
Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring Mailsac by hand means sending your key in the right header, targeting the mailsac.com host, and tracking address, message, validation, and webhook endpoints across two specs yourself. Once Jentic One is installed, you or your agent can find and add either Mailsac spec from the Jentic directory, store the key once, and call every operation.
Permission scoping
Mailsac puts the address in the URL path, so a rule in your own Jentic One instance can pin an agent to a single test inbox. You choose which operations the agent may call, so reserving addresses, the bulk private-address create, or setting a webhook is excluded unless you add it.
Credential isolation
Your single Mailsac API key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context, and the same stored key serves both specs.
FAQs
Specific to using Mailsac APIs through Jentic.
How many Mailsac APIs does Jentic list and how do they differ?
Jentic lists two Mailsac specs. The 16-endpoint spec covers the core inbox surface: reserving an address, listing and reading messages, validating addresses, and registering webhooks. The 47-endpoint spec adds bulk address reservation, bulk validation, owned-domain management, attachment download by content ID, account statistics, and websocket streams. Choose the smaller spec for single-inbox verification and the larger one for high-volume or domain-level work.
Do I need separate credentials for each Mailsac API?
No. Both specs authenticate with a single Mailsac account API key. The 47-endpoint spec sends it in the X-API-Key header and the 16-endpoint spec sends it in the Mailsac-Key header, but the underlying key is the same, so one stored credential covers every operation across both.
What is Mailsac good for and what is it not for?
Mailsac is for receiving and inspecting email at disposable and reserved addresses: verifying sign-up confirmations, password resets, and OTP codes, capturing inbound mail at owned domains, and asserting on message content and attachments. It does not send outbound email, host production user mailboxes, or scan attachments for malware.
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