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Mails.so

Cleans your mailing lists by validating email deliverability in real time and automates the removal of bounce risks before you hit send.

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Why use Ceven?

  1. AI native Mails.so integration

    • Describe the outcome and Ceven picks the right Mails.so 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 Mails.so data, across all 3 of its actions.

  2. Managed auth

    • Built in OAuth with automatic token refresh and rotation.
    • One place to manage, scope, and revoke Mails.so 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 Mails.so, when, and on whose behalf.
    • The agent pauses and asks when Mails.so is unclear instead of plowing ahead.

  4. Enterprise grade security

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

Supported tools

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

Validate Single Email
Use this when you need to check if a specific email address is deliverable and high quality before sending a message.
Validate Bulk Emails
Submit a large list of email addresses for verification. Use this to clean entire lead lists before a campaign launch.
Retrieve Batch Results
Pull the final deliverability status for a bulk validation job. Use this once the batch processing is complete using the job ID.
Check Email Syntax
Verify if an email follows the correct format before performing a deeper deliverability check.
Detect Disposable Email
Check if an email comes from a temporary or burner provider to prevent fake account creation.
Verify Domain MX Records
Confirm that the domain of an email address has valid mail exchange records to receive mail.
Scan For Catch All
Identify if a domain uses a catch all configuration which may affect deliverability certainty.
Audit List Quality
Run a sample of your list through validation to get an overall health score for your database.
Filter Invalid Leads
Move emails flagged as invalid by Mails.so into a separate excluded list in your CRM.
Update Lead Status
Mark a lead as verified or risky based on the Mails.so response code.
Schedule Bulk Clean
Set up a recurring workflow to validate new leads added to a specific folder every twenty four hours.
Get Validation Details
Pull the specific reason why an email was marked as invalid, such as a full mailbox or invalid user.

12 actions · scroll to see them all

Frequently asked questions

Ceven manages the asynchronous nature of bulk validation by first submitting the list to Mails.so and capturing the unique job ID. The agent then enters a polling state or waits for a trigger to call the retrieve batch results tool. Once the data is ready, Ceven parses the results and can either update your CRM records or generate a cleaned CSV file for you to download. This ensures that your workflow does not time out while waiting for thousands of emails to be processed by the Mails.so servers.
No. Mails.so is strictly a validation tool designed to check deliverability and syntax. It confirms if an email address exists and can receive mail, but it does not provide personal identity information, names, or social profiles of the email owners. For identity resolution, you would need to connect a separate lead enrichment tool to your Ceven workflow, using the validated email from Mails.so as the unique identifier to fetch additional data.
An unknown status usually means the mail server did not provide a definitive yes or no response, which often happens with strict corporate firewalls. In your Ceven workflow, you can define a specific path for unknown results. For example, you can choose to send these to a manual review queue or treat them as valid but flag them for a soft bounce check. This allows you to balance the risk of a bounce against the risk of missing a legitimate high value lead.
Yes. Mails.so enforces rate limits based on your current subscription tier, which can limit the number of single validation requests you can make per second. If your Ceven workflow triggers a massive burst of single requests, you may encounter a 429 too many requests error. To avoid this, Ceven recommends using the bulk validation tool for lists larger than fifty addresses, as it is optimized for volume and avoids the per second request caps applied to the single validation endpoint.
No. Mails.so uses a non intrusive method called SMTP handshake verification. It communicates with the recipient mail server to ask if the mailbox exists without actually sending a message. This means the recipient never knows their email was validated, and you do not risk annoying potential customers with verification emails before you have even started your actual outreach campaign. This makes it safe for use in stealth mode prospecting.
Ceven calls the Mails.so API which compares the domain against a massive and constantly updated database of known temporary email providers. When a user enters an email like those from Mailinator or 10 Minute Mail, Mails.so flags the provider as disposable. Ceven can then immediately trigger an action to block the signup or send a prompt asking the user to provide a permanent business email address to continue.
Yes. You can set up a scheduled workflow in Ceven that pulls all email addresses from your database and submits them to the Mails.so bulk validation tool. The agent can then iterate through the results and mark any that have become invalid since the last check as inactive. This is highly recommended for maintaining a healthy sender reputation, as emails can go dormant or be deleted over time even if they were valid during the initial signup.
Syntax checks are the first layer and simply ensure the email is formatted correctly, such as having an at symbol and a valid domain extension. Deliverability checks are deeper and involve contacting the mail server to see if the specific mailbox is active. Ceven uses both via Mails.so to ensure you do not waste credits on obvious typos while still catching addresses that look correct but no longer exist on the server.

Alternatives to Mails.so

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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