Hi. On Sat, Jun 13, 2020 at 12:21:12PM +0000, Andy Smith wrote: > Hi, > > On Sat, Jun 13, 2020 at 02:08:14PM +0200, l0f...@tuta.io wrote: > > 13 juin 2020 à 09:52 de a...@strugglers.net: > > > Looking at the email concerned, it had a line starting with "From" > > > quoted with a ">". > > > > > Indeed! I hope it's not a mistake of mine (usually I proofread my emails > > before sending them but who knows...). > > It was almost certainly done by Debian's mailing list software.
It was definitely done by Debian's mailing list software. It looks like this: 1) bendel.debian.org (postfix) receives the e-mail in question from w4.tutanota.de. 2) bendel (postfix) feeds incoming e-mail to bendel (amavisd), which reports that DKIM is OK: X-Amavis-Spam-Status: No, ... DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1 ... 3) bendel (amavisd) tosses e-mail back to bendel (postfix), which tosses it in turn to bendel (spamassassin). 4) The latter reports that DKIM test failed: X-Spam-Status: No, ... tests=DIGITS_LETTERS,DKIM_INVALID, DKIM_SIGNED 5) bendel (spamassassin) tosses the e-mail to bendel (postfix) again, the latter does the delivery. DKIM test fails again: Authentication-Results: w3.tutanota.de (dis=spam; info=dmarc domain policy); dmarc=fail (dis=spam p=quarantine; aspf=r; adkim=s; pSrc=dns) header.from=tuta.io; dkim=fail reason="body hash does not match" Reco
