Troubleshooting Guide: Fixing SendGrid Rejection Issues in Apollo Campaigns

Are you facing email delivery issues with your Apollo campaigns, receiving messages like “SendGrid rejected this email because its send from domain is not whitelisted in your Sendgrid account”? Don’t worry; we’ve got you covered. Here’s a comprehensive troubleshooting guide to help you resolve this problem efficiently.

Fixing SendGrid Rejection Issues in Apollo Campaigns

Identifying the Problem:

The error message suggests that there might be issues with domain and sender authentication in your SendGrid account. This commonly occurs due to unverified domains, incorrect DNS settings, missing API keys, or misconfigured sender authentication.


  1. Fix Domain Authentication: Ensure that your domain is properly authenticated in SendGrid. This involves verifying the domain and updating DNS settings if necessary.
  2. Fix Sender Authentication: Check if sender authentication settings are correctly configured. This includes verifying sender identity and ensuring that SPF, DKIM, and DMARC records are properly set up.
  3. Update DNS Settings: Make sure that your DNS settings are accurately configured to authenticate your domain and sender identity.
  4. Verify and Recheck: Double-check all configurations and verifications to ensure they are correctly set up in SendGrid.
  5. Generate SendGrid API Key: If API keys are missing or not generated, create a new API key in SendGrid and ensure it has the necessary permissions for sending emails.

Setting Up Apollo Integration with SendGrid:

  1. Toggle “Use SendGrid as default for entire team” in Apollo settings.
  2. Click “Fix settings” to save changes automatically.
  3. Enable additional engagement events as needed and save the settings.
  4. Enable SendGrid for a Mailbox in Apollo.

Additional Resources:

For detailed instructions on setting up, configuring, and troubleshooting your SendGrid account with Apollo, refer to the following guides:

  1. Set Up, Configure, API
  2. Apollo’s Integration with SendGrid

By following these steps and utilizing the resources provided, you can efficiently resolve SendGrid rejection issues and ensure seamless email delivery for your Apollo campaigns.

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