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: