diff --git a/towncrier/newsfragments/2776.bugfix b/towncrier/newsfragments/2776.bugfix
new file mode 100644
index 00000000..6856660b
--- /dev/null
+++ b/towncrier/newsfragments/2776.bugfix
@@ -0,0 +1 @@
+Fix downloading attachments through snappymail.
diff --git a/webmails/snuffleupagus.rules b/webmails/snuffleupagus.rules
index 8dde7cee..ca657719 100644
--- a/webmails/snuffleupagus.rules
+++ b/webmails/snuffleupagus.rules
@@ -25,7 +25,7 @@ sp.readonly_exec.enable();
 
 # PHP has a lot of wrappers, most of them aren't usually useful, you should
 # only enable the ones you're using.
-sp.wrappers_whitelist.list("file,php,phar,mailsosubstreams");
+sp.wrappers_whitelist.list("file,php,phar,mailsosubstreams,mailsoliteral,mailsotempfile,mailsobinary");
 
 # Prevent sloppy comparisons.
 sp.sloppy_comparison.enable();