diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index be0193e0ba..f2402dd60a 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -1475,8 +1475,8 @@ public class MessageHelper {
                         attachmentPart.setDisposition(attachment.disposition);
                     if (attachment.cid != null)
                         attachmentPart.setHeader("Content-ID", attachment.cid);
-                    if ("message/rfc822".equals(attachment.type))
-                        attachmentPart.setHeader("Content-Transfer-Encoding", "base64");
+                    //if ("message/rfc822".equals(attachment.type))
+                    //    attachmentPart.setHeader("Content-Transfer-Encoding", "base64");
 
                     if (attachment.isInline())
                         relatedMultiPart.addBodyPart(attachmentPart);