diff --git a/controle_cotisation/mail_instructions_headers.txt b/controle_cotisation/mail_instructions_headers.txt
index 3387c3d..1aaafa7 100644
--- a/controle_cotisation/mail_instructions_headers.txt
+++ b/controle_cotisation/mail_instructions_headers.txt
@@ -4,4 +4,4 @@ To: <COURRIEL_COTISANT>
 Subject: =?UTF-8?Q?=5bTr=c3=a9sorerie=5d_-_modalit=c3=a9s_de_r=c3=a8glement_de_vo?=
  =?UTF-8?Q?tre_cotisation_ANNEE_CIVILE?=
 Content-Type: text/plain; charset=UTF-8; format=flowed
-Content-Transfer-Encoding: 8bit
\ No newline at end of file
+Content-Transfer-Encoding: quoted-printable
\ No newline at end of file
diff --git a/controle_cotisation/mail_recap_header.txt b/controle_cotisation/mail_recap_header.txt
index 3ec6294..560205a 100644
--- a/controle_cotisation/mail_recap_header.txt
+++ b/controle_cotisation/mail_recap_header.txt
@@ -3,4 +3,4 @@ To: tresorier@a-lec.org
 Subject: Suivi automatique des cotisations
 MIME-Version: 1.0
 Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
\ No newline at end of file
+Content-Transfer-Encoding: quoted-printable
\ No newline at end of file
diff --git a/controle_cotisation/mail_recu_headers.txt b/controle_cotisation/mail_recu_headers.txt
index 9e3eba2..11ea4d3 100644
--- a/controle_cotisation/mail_recu_headers.txt
+++ b/controle_cotisation/mail_recu_headers.txt
@@ -9,4 +9,4 @@ Content-Type: multipart/mixed; boundary="------------3yxkFgv0AINs5nd0i6BJrWaV"
 This is a multi-part message in MIME format.
 --------------3yxkFgv0AINs5nd0i6BJrWaV
 Content-Type: text/plain; charset=UTF-8; format=flowed
-Content-Transfer-Encoding: 8bit
\ No newline at end of file
+Content-Transfer-Encoding: quoted-printable
\ No newline at end of file