1 files changed, 1 insertions, 1 deletions
diff --git a/program/include/rcube_mail_mime.php b/program/include/rcube_mail_mime.php
index f59354fea..ab93d3a70 100644
--- a/program/include/rcube_mail_mime.php
+++ b/program/include/rcube_mail_mime.php
@@ -180,7 +180,7 @@ class rcube_mail_mime extends Mail_mime
         }
       }
 
-      $input[$hdr_name] = $hdr_value;
+      $input[$hdr_name] = wordwrap($hdr_value, 990, "\n", true);  // hard limit header length
     }
 
     return $input;