mailerastro_send_email

// WHEN AI AGENTS USE THIS TOOL

AI agents use mailerastro_send_email to create or modify resources in MailerAstro. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON MAILERASTRO_SEND_EMAIL

Without a policy, an AI agent could call mailerastro_send_email repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach MailerAstro.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

mailerastro-mailerastro-email.yaml

tools:
  mailerastro_send_email:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full MailerAstro policy for all 6 tools.

// DETAILS

Tool Name mailerastro_send_email

Category Write

MCP Server MailerAstro MCP Server

Risk Level Medium

// MORE MAILERASTRO TOOLS

Write mailerastro_send_batch Read mailerastro_check_balance Read mailerastro_get_reputation Read mailerastro_get_send_history Read mailerastro_get_started

// WHAT CAN GO WRONG

Agents calling write-class tools like mailerastro_send_email have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update AbraFlexi invoice_received_create

// RELATED READING

// FAQ

What does the mailerastro_send_email tool do? +

Send a single transactional email through MailerAstro. Payment is automatic via your wallet's USDC balance on Base (x402 protocol). Pricing: - Plain text: $0.001 per email - HTML: $0.005 per email Your wallet address IS your identity — no API keys or accounts needed. First-time senders are automatically registered. Args: - wallet_address (string): Your 0x... Ethereum/Base wallet address - to (string): Recipient email address - from (string): Sender email address - from_name (string, optional): Display name for sender - subject (string): Email subject line - body (string): Email body (plain text or HTML) - content_type ('text' | 'html'): Content format (default: 'text') - reply_to (string, optional): Reply-to email address Returns: JSON with: success (boolean), messageId (string), cost (number), remainingBalance (number) Examples: - Send a welcome email: wallet_address="0x...", to="user@example.com", from="hello@myapp.com", subject="Welcome!", body="Thanks for signing up." - Send HTML email: same as above but content_type="html", body="<h1>Welcome!</h1>" Error Handling: - 402: Insufficient USDC balance. Fund your wallet on Base. - 429: Rate limited. Max 60 emails/minute. - Use mailerastro_check_balance to verify funds before sending.. It is categorised as a Write tool in the MailerAstro MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mailerastro_send_email? +

Add a rule in your Intercept YAML policy under the tools section for mailerastro_send_email. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the MailerAstro MCP server.

What risk level is mailerastro_send_email? +

mailerastro_send_email is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mailerastro_send_email? +

Yes. Add a rate_limit block to the mailerastro_send_email rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block mailerastro_send_email completely? +

Set action: deny in the Intercept policy for mailerastro_send_email. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides mailerastro_send_email? +

mailerastro_send_email is provided by the MailerAstro MCP server (mailerastro/mailerastro-email). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policies on MailerAstro