I've had arguments before with folks over this, but Gmail leaves them in and adds one on every smtp hop. Doesn't cost much and might be useful in debugging, especially with forwarding which changes the envelope sender.
Adding two for a single hop seems odd, but may be indicative of some quirk of the receiver, passing through multiple internal hops or even on the same box. If they're evaluating SPF on the wrong one, it's probably indicative of a bug on their side. Brandon On Thu, Apr 11, 2019, 12:26 PM Michael Wise via mailop <[email protected]> wrote: > > > Some people forge the Return-Path. > > Others add it prematurely. > > > > I’d trust the VERP over re-stating the Friendly, but who knows. > > > > Sometimes the safest thing, if you are the actual end receiver, is to > remove any Return-Path headers in the message, because gosh darned it, they > are only there to save the state of the RFC 821 values, and technically > serve no other legitimate purpose. > > > > Aloha, > > Michael. > > -- > > *Michael J Wise* > Microsoft Corporation| Spam Analysis > > "Your Spam Specimen Has Been Processed." > > Got the Junk Mail Reporting Tool > <http://www.microsoft.com/en-us/download/details.aspx?id=18275> ? > > > > *From:* mailop <[email protected]> *On Behalf Of *Autumn > Tyr-Salvia > *Sent:* Thursday, April 11, 2019 12:01 PM > *To:* Mailop <[email protected]> > *Subject:* [mailop] 2 Return-Path headers? > > > > 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 > _______________________________________________ > mailop mailing list > [email protected] > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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