Hi, test results are in.
My own mail came as: Content-Transfer-Encoding: 8bit with the quoted mail address as > "Sa=C5=A1a_Jani=C5=A1ka" is "Sasa_Janiska" with haceks on the "s". The copy from debian-user@lists.debian.org came with Content-Transfer-Encoding: quoted-printable and the quoted mail address > "Sa=3DC5=3DA1a_Jani=3DC5=3DA1ka" is "Sasa_Janiska" with haceks on the "s"= I.e. the list mail server converted each "=" to "=3D", except the last My alpine mail client displays both as "Sa=C5=A1a_Jani=C5=A1ka" is "Sasa_Janiska" with haceks on the "s". I.e. it kept the "8bit" text as in the mailbox file and converted the "=3D" in "quoted-printable" back to "=". (This mail must look very confusing on a client which does not convert "quoted-printable" back to 8 bit. If so: convert equalsign+"3"+"D" to equalsign.) Have a nice day :) Thomas