Hey Brandon, Yes, all messages had 100% valid headers, and a single from address.
I connot remember which special characters exactly caused this bounce. It wasn’t all of the special characters, just 2 or 3 from my testing. Sure I can run it again and confirm if you like. Kind Regards, Richelo Killian From: Brandon Long <bl...@google.com> <bl...@google.com> Reply: Brandon Long <bl...@google.com> <bl...@google.com> Date: December 14, 2021 at 19:43:16 To: Richelo Killian <richelo.kill...@imnica.com> <richelo.kill...@imnica.com> Cc: mailop@mailop.org <mailop@mailop.org> <mailop@mailop.org> Subject: Re: [mailop] Gmail rejects multiple From:'s. Who else? If we sent you this message, our parser believed that you were sending us two or more addresses in the from header. I would be semi-curious if you had a valid rfc2822 (or later) address that we thought was two addresses. Brandon On Tue, Dec 14, 2021 at 12:19 AM Richelo Killian via mailop < mailop@mailop.org> wrote: > When I ran into those messages in the past from Google, the messages > actually did not have multiple from addresses. It turns out the issue was > the friendly from part had certain special characters in it. Not all > special characters, but certain ones do trigger this bounce mesage. > > So check that first before digging any deeper. I went down this rabit hole > ;-) > > Kind Regards, > > Richelo Killian > > From: Alessandro Vesely via mailop <mailop@mailop.org> <mailop@mailop.org> > Reply: Alessandro Vesely <ves...@tana.it> <ves...@tana.it> > Date: December 14, 2021 at 09:55:41 > To: mailop@mailop.org <mailop@mailop.org> <mailop@mailop.org> > Subject: Re: [mailop] Gmail rejects multiple From:'s. Who else? > > On Mon 13/Dec/2021 18:51:48 +0100 Brandon Long wrote: > > On Mon, Dec 13, 2021 at 9:46 AM Slavko via mailop <mailop@mailop.org> > wrote: > >> Dňa Mon, 13 Dec 2021 18:19:07 +0100 Alessandro Vesely via mailop < > mailop@mailop.org> napísal: > >> > >>> Is it customary to reject messages with multiple addresses in From:? > >>> Why? > >> > >> AFAIK, DMARC works with only one From: address, thus sites which > >> are verifying DMARC tends to reject multiple addresses in it. > > > > Basically, yes, DMARC doesn't handle multiple from addresses, otherwise > one > > could do From: m...@whatever.com, accou...@google.com and which domain > would > > this be considered from? I guess one could evaluate DMARC for both. > > > Evaluating both doesn't make much sense, because a DMARC receiver is > actually > verifying proper sending from the author's domain. The author who added > one or > more coauthors in the From: line is still sending through her usual MUA > and > submission server. Thus that's the only domain which is worth verifying. > > A Sender: line should point to the right domain. However, I'd propose that > the > sender be the first address in the From: line, which grants visibility and > simplifies verifiers' code. > > > > We also reject multiple From headers, which is much more common but > > basically always an error or spam. > > > Yes, that's explicitly forbidden and a known DKIM vulnerability (DKIM > signers > should specify From: twice in h=). > > > Best > Ale > -- > > > > > > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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