diff --git a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
index b9119a714d9..7bfd8aa4b12 100644
--- a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
+++ b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
@@ -22,6 +22,12 @@
     border: none;
     overflow: auto;
 
+    &::placeholder {
+        white-space: nowrap;
+        overflow-x: hidden;
+        text-overflow: ellipsis;
+    }
+
     &.o-composer-is-compact {
         // When composer is compact, textarea should not be rounded on the right as
         // buttons are glued to it