diff --git a/mail/templates/default/app.css b/mail/templates/default/app.css
index a5ffcfebf6..2da035430d 100644
--- a/mail/templates/default/app.css
+++ b/mail/templates/default/app.css
@@ -755,6 +755,10 @@ blockquote blockquote blockquote blockquote blockquote blockquote{
 		border-right: none !important;
 		border-left: none !important;
 	}
+	/* set font size for printing of text mail body and all headers, attachments */
+	.td_display pre, .mailDisplayHeaders, .mailDisplayAttachments * {
+		font-size: 12pt !important;
+	}
 	.mailDisplayHeaders {
 		border-bottom: 0.1em solid #d7d7d7;
 		padding-top: 4px;
diff --git a/mail/templates/pixelegg/app.css b/mail/templates/pixelegg/app.css
index 14d1db0135..057199b377 100755
--- a/mail/templates/pixelegg/app.css
+++ b/mail/templates/pixelegg/app.css
@@ -751,6 +751,12 @@ blockquote blockquote blockquote blockquote blockquote blockquote {
     border-right: none !important;
     border-left: none !important;
   }
+  /* set font size for printing of text mail body and all headers, attachments */
+  .td_display pre,
+  .mailDisplayHeaders,
+  .mailDisplayAttachments * {
+    font-size: 12pt !important;
+  }
   .mailDisplayHeaders {
     border-bottom: 0.1em solid #d7d7d7;
     padding-top: 4px;