diff --git a/mail/etc/postfix/canonical b/mail/etc/postfix/canonical
new file mode 100644
index 0000000..33c17f7
--- /dev/null
+++ b/mail/etc/postfix/canonical
@@ -0,0 +1 @@
+/^([^@]+)\+(.*)@ketrenos\.com$/ ${1}_${2}@ketrenos.com
\ No newline at end of file