If your email is rejected by a mailbox provider and the error message directed you to Return Path, the following information may be helpful.

Today's email filters are extremely sophisticated. Following email industry best practices is one way to improve your inbox placement, but best practices are not going to maximize your deliverability and optimize your revenue.

Return Path recommends following bulk sender guidelines while also monitoring reputation data, campaign-level filtering data, and individual-level filtering data at all major email providers and filtering companies.

To get started, we suggest the following:

  • Create an account at
  • If your SenderScore is below 70, you need to repair your sender reputation. Download the Ultimate Guide to Email Deliverability to understand the factors that go into determining deliverability and how to improve your sender reputation.
  • If your SenderScore is above 70, continue following industry best practices and optimizing your email program. Read the report, The Art and Science of Subject Lines, to understand the best subject lines and keywords to drive engagement.
  • If your SenderScore is above 80, you may qualify for our Certification program, the industry-leading whitelist. Learn more about the Return Path Certification program.

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