diff --git a/dovecot/conf/dovecot.conf b/dovecot/conf/dovecot.conf
index b06aca95..9d8b5e16 100644
--- a/dovecot/conf/dovecot.conf
+++ b/dovecot/conf/dovecot.conf
@@ -161,6 +161,14 @@ plugin {
 	sieve_default = /var/lib/dovecot/default.sieve
 	sieve_after = /var/lib/dovecot/after.sieve
   sieve_extdata_dict_uri = proxy::sieve
+
+  # Send vacation replies even for aliases
+  # See the Pigeonhole documentation about warnings: http://wiki2.dovecot.org/Pigeonhole/Sieve/Extensions/Vacation
+  # It appears that our implemntation of mail delivery meets criteria of section 4.5
+  # from RFC 5230 and that disabling the recipient checks is not an issue here.
+  sieve_vacation_dont_check_recipient = yes
+
+  # Include the recipient in vacation replies so that DKIM applies
   sieve_vacation_send_from_recipient = yes
 
   antispam_backend = mailtrain