I'm having trouble with some customer's spam filters flagging my apps emails as spam. I have a custom domain and properly configured an SPF record for the google mail servers. Mail get through to most customers. However, some customers are filtering based on the return path. If I know that the obfuscated return path is unique to my application and that it does not change, then I can have them unblock based on that. Please let me know if this is true. Thanks.
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