diff --git a/lib/pyulib/src/uapps/umail.py b/lib/pyulib/src/uapps/umail.py
index 47ae1bf..310554a 100755
--- a/lib/pyulib/src/uapps/umail.py
+++ b/lib/pyulib/src/uapps/umail.py
@@ -57,6 +57,7 @@ def run_umail():
         ('c:', 'cc=', "Destinataires en copie"),
         ('b:', 'bcc=', "Destinataires en copie cachée"),
         ('a:', 'attach=', "Attacher un fichier"),
+        ('t:', 'content-type=', "Spécifier le type de contenu du fichier"),
         ('f:', 'body=', "Spécifier un fichier contenant le corps du message"),
         ])
     options, args = get_args(None, options, longoptions)
@@ -68,6 +69,7 @@ def run_umail():
     body = None
     bodyfile = None
     afiles = []
+    amimetypes = []
     for option, value in options:
         if option in ('-h', '--help'):
             display_help()
@@ -80,6 +82,8 @@ def run_umail():
             mbccs.extend(value.split(','))
         elif option in ('-a', '--attach'):
             afiles.append(value)
+        elif option in ('-t', '--content-type'):
+            amimetypes.append(value)
         elif option in ('-f', '--body'):
             bodyfile = value
             if bodyfile == "-":
@@ -117,9 +121,14 @@ def run_umail():
             body = MIMEText('\n'.join(lines), 'plain')
             body.set_charset('utf-8')
             msg.attach(body)
+        i = 0
         for afile in afiles:
             if not path.isfile(afile): die("%s: Fichier introuvable" % afile)
-            mimetype, encoding = mimetypes.guess_type(afile)
+            mimetype = amimetypes[i:i + 1] and amimetypes[i] or None
+            encoding = None
+            i += 1
+            if mimetype is None:
+                mimetype, encoding = mimetypes.guess_type(afile)
             if mimetype is None or encoding is not None:
                 mimetype = 'application/octet-stream'
             maintype, subtype = mimetype.split('/', 1)