3 files changed, 13 insertions, 2 deletions
diff --git a/program/steps/mail/sendmail.inc b/program/steps/mail/sendmail.inc
index 6691e000c..134664b85 100644
--- a/program/steps/mail/sendmail.inc
+++ b/program/steps/mail/sendmail.inc
@@ -456,7 +456,7 @@ if (is_array($_SESSION['compose']['attachments']))
 
 // choose transfer encoding for plain/text body
 if (preg_match('/[^\x00-\x7F]/', $MAIL_MIME->getTXTBody()))
-  $transfer_encoding = '8bit';
+  $transfer_encoding = $RCMAIL->config->get('force_7bit') ? 'quoted-printable' : '8bit';
 else
   $transfer_encoding = '7bit';
 
diff --git a/program/steps/settings/func.inc b/program/steps/settings/func.inc
index 094fa5995..7d59e73f1 100644
--- a/program/steps/settings/func.inc
+++ b/program/steps/settings/func.inc
@@ -449,7 +449,17 @@ function rcmail_user_prefs($current=null)
         'content' => $select_param_folding->show($config['mime_param_folding']),
       );
     }
-    
+
+    if (!isset($no_override['force_7bit'])) {
+      $field_id = 'rcmfd_force_7bit';
+      $input_7bit = new html_checkbox(array('name' => '_force_7bit', 'id' => $field_id, 'value' => 1));
+
+      $blocks['main']['options']['force_7bit'] = array(
+        'title' => html::label($field_id, Q(rcube_label('force7bit'))),
+        'content' => $input_7bit->show($config['force_7bit']?1:0),
+      );
+    }
+
     if (!isset($no_override['top_posting'])) {
       $field_id = 'rcmfd_top_posting';
       $select_replymode = new html_select(array('name' => '_top_posting', 'id' => $field_id, 'onchange' => "\$('#rcmfd_sig_above').attr('disabled',this.selectedIndex==0)"));
diff --git a/program/steps/settings/save_prefs.inc b/program/steps/settings/save_prefs.inc
index 531942557..8a732bf45 100644
--- a/program/steps/settings/save_prefs.inc
+++ b/program/steps/settings/save_prefs.inc
@@ -62,6 +62,7 @@ switch ($CURR_SECTION)
       'htmleditor'         => isset($_POST['_htmleditor']) ? TRUE : FALSE,
       'draft_autosave'     => isset($_POST['_draft_autosave']) ? intval($_POST['_draft_autosave']) : 0,
       'mime_param_folding' => isset($_POST['_mime_param_folding']) ? intval($_POST['_mime_param_folding']) : 0,
+      'force_7bit'         => isset($_POST['_force_7bit']) ? TRUE : FALSE,
       'show_sig'           => isset($_POST['_show_sig']) ? intval($_POST['_show_sig']) : 1,
       'top_posting'        => !empty($_POST['_top_posting']),
       'strip_existing_sig' => isset($_POST['_strip_existing_sig']),