bad charset selection in mails from the music store

[Abel Deuring]

I just bought a few albums via the U1 music store and paid in Euro. The confirmation mail did not correctly show the Euro symbol in the plain text representation. (The HTML variant of the text looks fine.) This is the relevant part of the message body:

----boundary_14_82252485-fe5d-4929-aabf-c6f4c030cc64
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

Vielen Dank, dass Sie den Ubuntu One Music Store benutzen.=0D=0ADies ist=
 Ihre Quittung f=FCr Ihre gekaufte Musik.=0D=0A=0D=0AIhre Bestellung:=0D=0A++++++++++++++++++++++++++++++++++++++++++++++++++++++=
 =0D=0Axxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 9,99?=0D=0Axxxxx=
 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 9,99?=0D=0Axxxxxxxxxxxxxxxxxx=
 xxxxxxxxxxxxxxxx 9,49?=0D=0Axxxxxxxxxxxxxxxxxxxxxxxxxxxxx=
 xxxxxxxxxxxxxxxxxxxx 9,99?=0D=0A =0D=0A++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
=0D=0ABestellungsnummer : xxxxxxxx=0D=0ABestellungszeitpunkt : 14/05/2012=
 13:35:15=0D=0AEmail : abel.deuring@xxxxxxxxxxxx=0D=0AZahlungsweise : Visa=
 Credit=0D=0APreis : 39,46€=0D=0A++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=

ISO-8859-1 does not contain the Euro symbol, so we have the usual mapping 9,99€ -> 9,99? The total amount is slightly better displayed: "39,46€" but that is also not strictly correct ;)