VM0Agent Skills
Mailsac
Disposable email testing and validation with Mailsac API
Mailsac is a disposable email service for testing and development. This skill enables your agent to receive test emails, validate addresses, manage private inboxes, and configure webhooks.
Required Environment
| Name | Type | Description |
|---|---|---|
MAILSAC_API_KEY | secret | Mailsac API key |
Get your API key from your Mailsac account dashboard after signup.
Configuration
version: "1.0"
agents:
my-agent:
framework: claude-code
skills:
- https://github.com/vm0-ai/vm0-skills/tree/main/mailsacRun
Store your secret on the platform (recommended, one-time setup):
vm0 secret set MAILSAC_API_KEY your-mailsac-api-keyThen run your agent - secrets are automatically loaded:
vm0 run my-agent "check for new test emails"For CI/CD or temporary overrides, pass secrets at runtime: --secrets MAILSAC_API_KEY=value. See Environment Variables for details.
Example Instructions
# Email Test Agent
You use Mailsac to test email delivery workflows.
## Workflow
1. Reserve a private test inbox
2. Trigger the email sending workflow
3. Check the inbox for the delivered message
4. Validate email content and headers
## Checks
- Verify subject line matches expected format
- Confirm sender address is correct
- Check for required links in the body
- Validate that attachments are present# Email Validation Agent
You use Mailsac to validate email addresses.
## Workflow
1. Accept a list of email addresses
2. Validate each address format
3. Check for disposable email domains
4. Return validation results with reasons
## Output
- valid: proper format and real domain
- disposable: uses a temporary email service
- invalid: malformed or unreachable domain