Postmarkapp Postmark Account-level API
Browse all Postmarkapp APIs✓ Official Vendor SpecCommunicationsEmail DeliveryapiKey23 EndpointsREST
For Agents
Manage Postmark account infrastructure including servers, domains with DNS verification, sender signatures, and cross-server template distribution.
Use for: I need to create a new mail server in my Postmark account, I want to verify DKIM records for a sending domain, List all sender signatures configured in the account, Check whether a domain's SPF record is properly configured
Not supported: Does not handle individual email sending, bounce processing, or message statistics — use for account-level infrastructure management (servers, domains, senders) only.
The Postmark Account-level API enables management of servers, domains, sender signatures, and template distribution across a Postmark account with 23 endpoints. It handles domain DNS verification (DKIM, SPF, Return-Path), sender identity configuration, server provisioning, and cross-server template deployment for organizations managing multiple sending environments.
Install Jentic One Beta
Connect the Postmark Account-level API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Postmark Account-level API, 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.
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Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | 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.
Capabilities
What an agent can do with Postmark Account-level API.
Provision and configure mail servers within a Postmark account
Register and verify sending domains with automated DKIM, SPF, and Return-Path DNS checks
Create and manage sender signatures with SPF verification and DKIM rotation
Push email templates from one server to others for consistent cross-environment deployment
Rotate DKIM keys on domains to maintain email authentication security
Verify domain ownership through DNS record validation workflows
Use Cases
Patterns agents use Postmark Account-level API for, with concrete tasks.
★ Multi-Environment Server Management
Manage separate Postmark servers for development, staging, and production environments within a single account. The Account-level API allows agents to create servers with distinct configurations, push templates between them for deployment consistency, and maintain isolated sending environments. Each server maintains its own API token and sending statistics.
Create a new server via POST /servers with a name and color label, then push templates from an existing server to the new one using POST /templates/push
Domain Authentication Setup
Configure and verify sending domains with proper DNS authentication records. The API provides endpoints to register domains, check DKIM and SPF verification status, rotate DKIM keys, and verify Return-Path configuration. Agents can monitor verification status and alert when DNS records become invalid or need rotation.
Create a domain via POST /domains, then verify its DKIM record using PUT /domains/{domainid}/verifydkim and check the SPF status with PUT /domains/{domainid}/verifyspf
Sender Identity Management
Register and verify sender email addresses and signatures for use across the account. The API supports creating sender signatures, resending verification emails, requesting new DKIM keys, and verifying SPF for individual senders. This ensures all sending identities maintain proper authentication for deliverability.
List all senders via GET /senders, identify any with unverified SPF, and trigger SPF verification for each using PUT /senders/{signatureid}/verifyspf
AI Agent Email Infrastructure Automation
Enable AI agents to manage Postmark account infrastructure through Jentic. Agents can provision servers, verify domains, manage sender identities, and deploy templates across environments without hardcoding API paths or managing account-level tokens directly.
Search Jentic for 'verify email sending domain DNS', load the operation schema for domain DKIM verification, and execute against a specified domain ID
Key Endpoints
23 endpoints — the postmark account-level api enables management of servers, domains, sender signatures, and template distribution across a postmark account with 23 endpoints.
METHOD
PATH
DESCRIPTION
GET
/servers
List all servers in the account
POST
/servers
Create a new server
GET
/domains
List all sending domains
PUT
/domains/{domainid}/verifydkim
Verify DKIM DNS record for a domain
PUT
/domains/{domainid}/verifyspf
Verify SPF record for a domain
GET
/senders
List all sender signatures
POST
/templates/push
Push templates between servers
PUT
/domains/{domainid}/rotatedkim
Rotate DKIM key for a domain
GET
/servers
List all servers in the account
POST
/servers
Create a new server
GET
/domains
List all sending domains
PUT
/domains/{domainid}/verifydkim
Verify DKIM DNS record for a domain
PUT
/domains/{domainid}/verifyspf
Verify SPF record for a domain
GET
/senders
List all sender signatures
POST
/templates/push
Push templates between servers
PUT
/domains/{domainid}/rotatedkim
Rotate DKIM key for a domain
Why Jentic?
Three things that make agents converge on Jentic-routed access.
Credential isolation
Postmark account tokens (X-Postmark-Account-Token header) are stored encrypted in the Jentic vault. Agents receive scoped access that injects the token automatically — raw account credentials never enter the agent context.
Intent-based discovery
Agents search by intent (e.g., 'verify email domain DNS') and Jentic returns matching Postmark Account operations with parameter schemas, so agents can manage infrastructure without memorizing endpoint paths.
Time to first call
Direct Postmark Account API integration: 1-2 days for token management and domain verification workflows. Through Jentic: under 30 minutes — search, load schema, execute.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Postmark Account-level API through Jentic.
What authentication does the Postmark Account-level API use?
The Postmark Account-level API uses an account token passed in the X-Postmark-Account-Token header with every request. This is different from server-level tokens used for sending emails. Through Jentic, the account token is stored encrypted in the credential vault and injected into requests automatically.
Can I provision new mail servers with the Postmark Account API?
Yes. POST to /servers creates a new server with configurable name, color label, and delivery settings. Each server gets its own API token for sending and its own statistics. You can also retrieve and update server configurations via GET and PUT /servers/{serverid}.
How do I verify domain DNS records with this API?
Use PUT /domains/{domainid}/verifydkim to check DKIM, PUT /domains/{domainid}/verifyspf for SPF, and PUT /domains/{domainid}/verifyreturnpath for Return-Path records. Each returns the current verification status and expected DNS record values. You can also rotate DKIM keys via PUT /domains/{domainid}/rotatedkim.
How do I push templates between servers through Jentic?
Search Jentic for 'push email templates between servers', load the operation schema for POST /templates/push, and execute with the source server ID and destination server ID. This deploys all templates from one server to another. Install with pip install jentic and sign up at https://app.jentic.com/sign-up.
What is the difference between the Account API and the Server API?
The Account-level API manages infrastructure across your entire Postmark account — servers, domains, and sender signatures. The Server API handles individual email operations — sending messages, tracking bounces, and viewing statistics for a specific server. They use different authentication tokens.
Can I manage sender signatures programmatically?
Yes. GET /senders lists all signatures, POST /senders creates a new one, and PUT /senders/{signatureid}/verifyspf triggers SPF verification. You can also resend the confirmation email via POST /senders/{signatureid}/resend and request new DKIM keys via POST /senders/{signatureid}/requestnewdkim.
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