No existing Return-Path should be in the headers when your MTA receives
an email.. Some ESP's we have noticed, sloppily add one, even when it
isn't the final destination.. and yes, as Michael mentioned, sometimes
there are forgeries..
Too bad there are some important emails send via ESP's that exhibit this
problem, but fortunately not many..
I would not 'reject' a message for having a pre-existing Return-Path,
but would have not much trouble filing it in the customers spam folder
until the ESP gets their act in order..
IMHO
On 2019-04-11 12:25 p.m., Michael Wise via mailop 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.
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*Michael J Wise*
MicrosoftCorporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Got the Junk Mail Reporting Tool
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*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
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