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Request Parameters

The following parameters are used when sending an email:
ParameterTypeRequiredDescription
sender_addressstringYesEmail address that will appear in the “From” field
recipient_addressstringYesEmail address of the recipient
subjectstringYesSubject line of the email
bodystringYesContent of the email (plain text or HTML)
headersobjectNoOptional email headers as key-value pairs (cc, bcc, etc.)
attachment_uriarrayNoArray of URIs pointing to files you want to attach to the email

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Code Examples

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Send a Simple Text Email

curl --location 'https://api.a1base.com/v1/emails/{account_id}/send' \
--header 'X-API-Key: YOUR_API_KEY' \
--header 'X-API-Secret: YOUR_API_SECRET' \
--header 'Content-Type: application/json' \
--data-raw '{
    "sender_address": "[email protected]",  
    "recipient_address": "[email protected]", 
    "subject": "Hello from A1Base",
    "body": "This is an example email body.",
    "headers": {}
}'

​
Send an HTML Email

curl --location 'https://api.a1base.com/v1/emails/{account_id}/send' \
--header 'X-API-Key: YOUR_API_KEY' \
--header 'X-API-Secret: YOUR_API_SECRET' \
--header 'Content-Type: application/json' \
--data-raw '{
    "sender_address": "[email protected]",
    "recipient_address": "[email protected]",
    "subject": "Hello from A1Base",
    "body": "<!DOCTYPE html><html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" /><title>A1Mail for AI Agents</title></head><body><p>Hey,<br><br>Welcome to A1Mail!<br>A1Mail is an email API made for AI agents who chat, not spam.<br><br>With A1Mail you can:</p><ul><li>Create new addresses via a simple API</li><li>Send emails effortlessly</li><li>Receive messages instantly via webhooks</li><li>Protect deliverability with built-in spam filters</li><li>Integrate with any AI system</li><li>Enjoy transparent pricing—no hidden fees</li><li>Use your own subdomain for AI agents</li></ul>Find out more at <a href=\"http://www.a1mail.com\">www.a1mail.com</a>.</p></body></html>",
    "headers": {
        "cc": "[email protected]",
        "bcc": "[email protected]"
    }
}'

### Send an Email with Attachments

```bash
curl --location 'https://api.a1base.com/v1/emails/{account_id}/send' \
--header 'X-API-Key: YOUR_API_KEY' \
--header 'X-API-Secret: YOUR_API_SECRET' \
--header 'Content-Type: application/json' \
--data-raw '{
    "sender_address": "[email protected]",
    "recipient_address": "[email protected]",
    "subject": "Email with Attachments",
    "body": "Please find the attached files.",
    "headers": {},
    "attachment_uri": [
        "https://example.com/files/document.pdf",
        "https://example.com/files/image.jpg"
    ]
}'
We’d love to hear from you!Don’t hesitate to reach out to [email protected] or [email protected] if there’s any features you’d like to see or prioritised!

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Working with Attachments

To include attachments in your emails, use the attachment_uri parameter which accepts an array of URLs pointing to the files you want to attach.

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Supported Attachment Types

A1Mail supports most common file types for email attachments, including but not limited to:
  • PDF documents (*.pdf)
  • Images (*.jpg, *.jpeg, *.png, *.gif)
  • Office documents (*.docx, *.xlsx, *.pptx)
  • Text files (*.txt, *.csv)

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Attachment Size Limits

Attachments are subject to size limitations. Please ensure your attachments adhere to the following guidelines:
  • Individual attachment: Maximum 10MB
  • Total attachments per email: Maximum 25MB

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Hosting Attachments

Attachments must be accessible via a public URL. You can use your own hosting solution or any publicly accessible file storage service. Make sure the URLs provided in the attachment_uri array are directly accessible without authentication.