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MailerSend

Triggers transactional emails and SMS alerts based on app events, monitors delivery rates across sending domains, and manages recipient lists in real time.

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Why use Ceven?

  1. AI native MailerSend integration

    • Describe the outcome and Ceven picks the right MailerSend calls, fills the parameters, and checks the result.
    • Structured, agent friendly tool schemas so each call runs reliably instead of by guesswork.
    • Rich coverage for reading, writing, and querying your MailerSend data, across all 23 of its actions.

  2. Managed auth

    • Built in OAuth with automatic token refresh and rotation.
    • One place to manage, scope, and revoke MailerSend access.
    • Per user and per environment credentials instead of shared keys.

  3. Agent optimized design

    • Actions are tuned from real success and error rates so reliability climbs over time.
    • Full execution logs so you always know what ran in MailerSend, when, and on whose behalf.
    • The agent pauses and asks when MailerSend is unclear instead of plowing ahead.

  4. Enterprise grade security

    • Fine grained access so you control which agents and people can reach MailerSend.
    • Least privilege by default, read scopes first and only the writes a workflow needs.
    • A full audit trail of every MailerSend action to support review and sign off.

Supported tools

Every action Ceven's agents can run on MailerSend, and when to use it.

Create Sending Domain
Use this when you need to register and configure a new domain before you can send any transactional emails.
Create SMTP User
Use this after domain setup to generate the specific SMTP credentials needed for your application server.
Create API Token
Use this to generate a new token with specific permission scopes for different environments or apps.
Create Webhook
Use this to set up a listener for events like sent, delivered, or opened for a specific domain.
Delete Webhook
Use this when a specific webhook is no longer needed to stop receiving event notifications.
Get API Quota
Pull your current usage levels to monitor rate limits and avoid service interruptions.
Get Domain
Pull the status and DNS configuration of a specific domain to verify it is correctly authenticated.
List Domain Recipients
Pull a paginated list of all recipients associated with a specific domain ID.
Get Sent Messages
Pull the message logs for sent emails to audit delivery timestamps and recipient status.
Get Email Recipients
Pull and filter your list of email recipients by list ID or specific search terms.
Get SMS Activity
Pull delivery status and logs for sent SMS messages to track mobile engagement.
Get Email Templates
Pull a list of available email templates to verify names and IDs before sending.
Get sending domains
Tool to retrieve a list of sending domains. use after configuring the mailersend api key.
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
Tool to list sender identities. use when you need to retrieve all configured email or domain sender identities after authenticating with your mailersend api token.
Get SMS Inbounds
Tool to retrieve inbound sms messages. use when you need to fetch sms messages received on your mailersend numbers.
List SMS Messages
Tool to list sent sms messages with optional filters. use after sending sms to review message logs.
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.
Get SMTP users
Tool to retrieve a list of smtp users. use when you need to list and paginate smtp users.
Get API Tokens
Tool to retrieve a list of api tokens. use when you need to list and paginate api tokens after authentication.
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.

23 actions · scroll to see them all

Frequently asked questions

Ceven monitors your MailerSend API quota in real time using the Get API Quota tool. If the agent detects that you are approaching your plan limit, it implements an exponential backoff strategy for all non critical requests. This prevents your account from being temporarily throttled during high volume bursts. For users on higher tiers, the agent optimizes batch requests to minimize the number of calls. If a hard limit is hit, Ceven queues the action and notifies the workflow owner via your preferred channel, ensuring that no transactional emails are lost and that the system recovers automatically once the quota resets.
Yes. The agent uses the Get Domain tool to pull the current DNS configuration and verification status directly from MailerSend. When a domain is marked as unverified, the agent can identify exactly which SPF or DKIM record is missing or mismatched. While Ceven cannot log into your DNS provider to change records, it can draft the exact TXT records you need to add and send them to your IT team. Once you update the records, you can tell the agent to recheck the status every few minutes until the domain is fully verified and ready to send.
Ceven acts as the destination for your MailerSend webhooks. You use the Create Webhook tool to point MailerSend events to a unique Ceven endpoint. When an email is opened or bounces, MailerSend pushes a JSON payload to Ceven. The agent parses this event and matches it to a running workflow. For example, a bounce event can trigger the agent to search for that user in your database and mark them as invalid. This turns a passive notification into an active data cleanup process without requiring you to build a custom backend listener for every single event type.
Ceven handles multi domain setups by treating the domain ID as a required context variable. When you ask the agent to list recipients or check logs, it first calls Get Sending Domains to map your friendly domain names to their internal IDs. If a workflow is not specific about the domain, the agent will ask for clarification or iterate through all active domains to find the relevant data. This allows you to manage separate brand identities or regional domains from a single Ceven agent while keeping the reporting and recipient lists strictly isolated as per your MailerSend configuration.
Ceven is bound by the pagination limits of the MailerSend API. When pulling large recipient lists, the agent automatically handles the cursor and page tokens to ensure every record is processed. However, users should be aware that MailerSend API responses are paginated, and extremely large lists with hundreds of thousands of entries may take several minutes to fully synchronize into a workflow context. To optimize this, we recommend using the search filters in the Get Email Recipients tool to narrow down the dataset by list ID or specific attributes whenever possible.
Ceven stores your MailerSend API tokens in an encrypted vault. These tokens are never exposed to the model or the end user in plain text. When an action is triggered, the agent retrieves the token and injects it into the request header. You can use the Create API Token tool to generate tokens with fine grained permissions, which we highly recommend. By creating a token that only has permission to send mail and read logs, you limit the blast radius if a token is ever compromised. You can rotate these tokens at any time through the MailerSend dashboard or via Ceven.
One specific quirk of MailerSend is that certain account level resources, such as creating new sending domains, may require a higher level of account verification or manual approval from the MailerSend team before they become active. Even if the API call returns a success response, the domain might remain in a pending state for several hours. Ceven handles this by polling the domain status and alerting you only when the state actually changes to verified. Additionally, some API endpoints have stricter rate limits than the general sending API, so bulk administrative changes should be scheduled during low traffic periods.
Yes. Ceven can orchestrate multi channel workflows using both MailerSend email and SMS tools. For instance, you can build a workflow where the agent first sends a transactional email with a detailed report and then follows up with a short SMS notification containing a link to that report. The agent tracks the delivery status of both messages independently. If the email bounces, the agent can be configured to rely more heavily on the SMS channel or trigger a fallback alert to a human operator. This ensures that critical communications reach the user regardless of their preferred inbox.

Alternatives to MailerSend

Other tools that solve a similar problem. Ceven supports these too, so you can switch or run more than one at once.

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