Hello, I'm looking at headers for a particular message, and noticed two different Return-Path headers. The message is being sent by an ESP. One Return-Path uses a VERP address with the ESP's domain, and the other uses the same address as the friendly From:.
I haven't seen this in other headers before - is this common? Why would there be 2? I spent some quality time with RFC 2822 and couldn't determine if it's spec-legal to have two Return-Path headers or not. More to the point, it's using the one with the ESP domain for checking SPF, which is not what the desired behavior. I can reach out directly to the ESP in question to get more info, but wanted to ask this group first if there's some other resource I should consult for a firm understanding of using multiple Return-Path headers before I have that conversation. Thanks, Autumn Tyr-Salvia tyrsalvia@gmail atyrsalvia@agari
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