01
Trigger on event
- Listen for a new event
- Parse and validate the payload
- Take an action with the linked tool
MailerSend
23 tools available
MailerSend is a transactional email service designed for developers to integrate email sending capabilities into their applications.
Connect MailerSend to Definable to automate repetitive tasks, sync data with the rest of your stack, trigger on real-world events. Personas call MailerSend's 23 tools directly from chat or scheduled flows. You can wire it into any persona to read, write, and react when an event fires.
Common workflows with MailerSend
02
Daily summary
- Pull yesterday's activity
- Summarise with the model of your choice
- Send the digest via email or Slack
03
Cross-tool sync
- Read records from one app
- Transform with a persona
- Write the result back via this integration
MailerSend actions 23
Every MailerSend action below is a callable tool any Definable persona can invoke.
Create Sending Domain
Tool to add a new sending domain to MailerSend. Use when you need to register and configure a domain before sending emails.
Create SMTP User
Tool to create a new SMTP user. Use after domain setup to obtain SMTP credentials.
Create API Token
Creates a new API token with specified scopes (permissions) for a domain. The token allows programmatic access to MailerSend API endpoints based on granted scopes. WARNING: The token value is only displayed once upon creation and cannot be retrieved later.
Create Webhook
Tool to create a new webhook for a MailerSend domain. Use after you have a domain ID and need to receive event notifications like sent, delivered, opened, etc.
Delete Webhook
Tool to delete an existing webhook. Use when the webhook is no longer needed. Returns empty response on successful deletion (HTTP 204).
Get API Quota
Tool to retrieve current API usage quota. Use when monitoring API rate limits to avoid exceeding allowed calls.
Get Domain
Tool to retrieve detailed information about a specific sending domain in MailerSend. Returns domain verification status (DKIM, SPF, MX, tracking), settings (click/open tracking, paused status), and metadata (creation/update timestamps). Use this when you need to check if a domain is properly verified and configured for sending emails, or to review domain-specific tracking settings. Note: For detailed DNS record values, use the Get Domain DNS Records action.
List Domain Recipients
Tool to list recipients for a domain. Use after obtaining the domain ID to view recipients with optional pagination.
Get sending domains
Retrieve a paginated list of all sending domains configured in your MailerSend account. Use this to: - View all domains available for sending emails - Check domain verification and DNS status - Filter by verification status to find verified or unverified domains - Review domain settings like tracking and sending preferences Returns domain details including verification status, DNS configuration, and tracking settings.
Get general API resources
Tool to retrieve general API resources and information. Use when you need an overview of all MailerSend endpoints before constructing specific calls.
List Sender Identities
Retrieves a paginated list of sender identities configured in your MailerSend account. Sender identities are the email addresses or domains authorized to send emails through MailerSend. Each identity includes verification status, reply-to configuration, domain association, and optional personal notes. Use this tool to discover available sender identities before sending emails or to verify which identities are ready for use. Returns: Paginated list of identity objects with metadata including verification status, domain details, and navigation links for pagination.
Get sent messages
Tool to retrieve a paginated list of sent messages. Use after sending emails to view message logs.
Get email recipients
Tool to retrieve a list of email recipients. Use when you need to list and filter recipients by list ID or search term.
Get SMS Activity
Tool to retrieve SMS activity logs. Use when you need to fetch delivery status and logs of sent SMS messages.
Get SMS Inbounds
Retrieve inbound SMS route configurations. Inbound routes define rules for forwarding incoming SMS messages to webhook URLs based on message content filters. Use this action when you need to: - List all configured SMS inbound routes - Filter routes by SMS number or enabled status - Review webhook forwarding configurations and filter rules
List SMS Messages
Retrieves a paginated list of SMS messages sent through the MailerSend API. Returns message details including sender, recipients, content, status, and timestamps. Use this to review sent SMS messages and track their delivery status. Note: For detailed activity tracking with filters (date ranges, status, phone numbers), use the SMS Activity endpoint instead.
Get SMS Numbers
Tool to retrieve a paginated list of SMS phone numbers. Use after purchasing numbers to fetch available SMS numbers.
Get SMS recipients
Tool to retrieve a list of SMS recipients. Use when you need to list and paginate SMS recipients, optionally filtering by SMS number ID and/or recipient status.
Get SMTP users
Tool to retrieve a list of SMTP users. Use when you need to list and paginate SMTP users.
Get email templates
Retrieves a paginated list of email templates from your MailerSend account. Use this tool when you need to: - List all available email templates - Filter templates by domain ID - Browse templates with pagination - Check template details like name, type, and creation date Returns template metadata including IDs, names, types, and timestamps. For full template content, use a separate get single template endpoint.
Get API Tokens
Retrieves a paginated list of API tokens associated with your MailerSend account. Returns token details including ID, name, status, creation date, and assigned scopes/permissions. Requires 'tokens_full' scope.
Get users
Tool to retrieve a list of users associated with your account. Use after authenticating with a valid API token.
List webhooks
Tool to retrieve a list of webhooks. Use when you need to list and paginate all configured webhooks, optionally filtering by domain.
Loops.so
The email platform for modern SaaS. A better way to send product, marketing, and transactional email.
Mailtrap
Email Delivery Platform for testing and sending transactional emails
Postmark
Postmark is an email delivery service that enables developers to send transactional emails with high deliverability and detailed analytics.
Resend
The universal API for sending emails.
SendGrid
SendGrid is a cloud-based email delivery platform providing transactional and marketing email services, with APIs for integration, analytics, and scalability
Smtp2go
SMTP2GO is a reliable email delivery service that ensures your emails reach recipients' inboxes efficiently.
Frequently asked questions
What can I automate with MailerSend on Definable?
Anything MailerSend exposes through its API. Common transactional email workflows on Definable include automate repetitive tasks, sync data with the rest of your stack, trigger on real-world events. Personas can call any of the 23 MailerSend tools directly, then chain the result into another integration without you writing code.
How does MailerSend authentication work?
MailerSend uses API_KEY on Definable. You connect once from the integrations page, scoped to the permissions you choose, and from then on any persona that has the integration enabled can act on your behalf. Tokens are encrypted at rest and rotated automatically.
Is the MailerSend integration included in my Definable plan?
Yes — every Definable plan, including Starter, includes access to all 23 MailerSend tools. You only need a separate MailerSend subscription if MailerSend itself charges per seat or per API call.
Is using MailerSend through Definable secure?
Every call from a persona to MailerSend is logged with the user, persona, prompt, and response. Tokens never leave Definable's secrets vault, scopes are configurable per persona, and you can revoke access at any time from the integration page.
How do I get started with MailerSend on Definable?
Sign up for Definable, open the integrations page, find MailerSend, and connect via OAuth or API key. You can immediately attach MailerSend to any persona and start running workflows. The free Starter plan includes 5,000 credits/month.
What MailerSend actions does Definable expose?
Definable exposes all 23 MailerSend actions as callable tools — including `Create Sending Domain`, `Create SMTP User`, `Create API Token`, plus 20 more. Each tool gets a typed parameter schema so personas know exactly how to call it.
Ready to automate with MailerSend?
Wire it up in minutes. No coding required.