diff --git a/towncrier/newsfragments/3906.bugfix b/towncrier/newsfragments/3906.bugfix
new file mode 100644
index 00000000..045a083f
--- /dev/null
+++ b/towncrier/newsfragments/3906.bugfix
@@ -0,0 +1,2 @@
+Fix "passphrase changed" errors in snappymail. You may need to run:
+   find webmail/_data_/_default_/storage/ -name .cryptkey -delete
diff --git a/webmails/snappymail/defaults/application.ini b/webmails/snappymail/defaults/application.ini
index 5b11d751..b223bbd0 100644
--- a/webmails/snappymail/defaults/application.ini
+++ b/webmails/snappymail/defaults/application.ini
@@ -6,6 +6,7 @@ attachment_size_limit = {{ MAX_FILESIZE }}
 [security]
 allow_admin_panel = Off
 openpgp = On
+insecure_cryptkey = On
 
 [labs]
 allow_gravatar = Off