On 2023-09-07, raf via Mutt-users wrote: > On Wed, Sep 06, 2023 at 01:33:30PM +0200, f...@igh.de wrote: > >> Dear Mutt Users >> >> recently I experienced DKIM fails that depend on the >> Content-Transfer-Encoding of messages text part. >> >> Being a german I use to write my messages in german with UTF-8 >> encoding. I prefer plain text. My e-mails are DKIM signed. I have >> checked DKIM to be set up correctly twice. >> >> By default Mutt does 8bit encoding for text/plain. Now I found that >> several (most) of the recipient systems fail to check DKIM. >> >> If I force Mutt to change the encoding from 8bit to 7bit, base64, or >> quoted-printable (using ^E in the compose menu), the DKIM checks >> succeed. >> >> Can I force Mutt to use quoted-printable or base64 by default for >> encoding of plain text? >> >> Does anyone have similar experiences? Is there an explanation for this? >> May there be any interference with the MTA? >> >> Interestingly DKIM checks do not fail if I use non-ASCII characters in >> the subject. Also attachements do not cause DKIM to fail. >> >> Best Regards >> >> T. Finke >> >> -- >> ------------------------------------------------------------------------ >> T. Finke >> f...@igh.de >> ------------------------------------------------------------------------ > > Hi, This has come up recently in the Postfix mailing list. > MTAs can convert 8bit messages when sending to another MTA > that doesn't advertise that it can accept 8bit. If the DKIM > signing happens before the conversion, then subsequent DKIM > checks will fail. Work is being done in Postfix to address > this. I don't know about other MTAs. It seems unlikely that > there are any MTAs that can't accept 8bit messages, but perhaps > there are some that are misconfigured and don't advertise the > fact to other MTAs.
Has AOL/Yahoo/Verizon/...'s server software been finally fixed from its eternal dance between two different failure modes? (Either replacing non-ascii with ? or messing up the encoding); I think it also misadvertised 8-bit support to MUAs... But maybe that really just affects client connections and does not damage messages received from other servers? -- Nuno Silva
