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This documentation covers the Email Service API authentication and key management.

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Limits

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Email Sending Limits

  • Maximum recipients per API call: 100 subscribers
  • Maximum sending rate: 250 emails per hour (custom rates are available)
  • Email content: HTML format supported
  • Subject line: Standard email subject length limits apply
  • From address: Must be a verified domain email address

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Registration

  1. Go to https://platform.sendr.app/auth/sign-up and create your account.
  2. Verify email address
  3. Next you have to fill your account details:
  • Workspace name: usually your company name like mycompany
  • Default Domain name: mycompany.com
  • Default sending email: [email protected]
  1. Enter your Profile details: First and Last name and Save it

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Domain DNS verification

You’ll receive an email with DNS settings for your domain. You need to update your DNS records accordingly.
Important: You can have ONE domain per one tenant/workspace. To add more domains, create additional workspaces/tenants using the UI or API.

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Required DNS Records Example

  1. DKIM Record
    • Type: TXT
    • Name/Host: mail._domainkey.mycompany.com
    • Value: v=DKIM1; k=rsa; p=XXX+XXXX/XXX/XXX/XXX/XXX/XXX
    • TTL: 3600 (or Auto)
  2. SPF Record
    • Type: TXT
    • Name/Host: mycompany.com
    • Value: v=spf1 a mx include:spf.sendrapp.org ~all
    • TTL: 3600 (or Auto)
  3. DMARC Record
    • Type: TXT
    • Name/Host: _dmarc.mycompany.com
    • Value: v=DMARC1; p=quarantine; rua=mailto:[email protected]
    • TTL: 3600 (or Auto)

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Authentication

The Email Service API uses API key authentication for all endpoints. Each request must include an API key in the Authorization header.

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Getting Your API Key

  1. API key generating automatically with limited scopes and sending after domain onboarding to the SENDR platform. Please check your email.
  2. Sometimes you might be need to regenerate your API key.
  3. Log in to your Sendr account
  4. Navigate to the API Keys section
  5. Generate a new API key or modify an existing one

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Using Your API Key

Include your API key in the Authorization header of every request: 
Authorization: your-api-key-here

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Error Handling

If your API key is invalid or expired, you’ll receive a 401 Unauthorized response. Check the error message for details on how to resolve the issue.