diff --git a/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/91lda b/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/91lda
index ec4b723..d8a5c96 100644
--- a/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/91lda
+++ b/root/etc/e-smith/templates/etc/dovecot/dovecot.conf/91lda
@@ -13,6 +13,8 @@ if ($subject ne ''){
 }
 }
 
+recipient_delimiter = -
+
 protocol lda \{
   mail_plugins = $mail_plugins {$OUT .= (($sieve{'status'} || 'disabled') eq 'enabled') ? 'sieve':''}
 \}
diff --git a/smeserver-dovecot.spec b/smeserver-dovecot.spec
index 617b480..3775632 100644
--- a/smeserver-dovecot.spec
+++ b/smeserver-dovecot.spec
@@ -1,5 +1,5 @@
 %define version 11.0.0
-%define release 17
+%define release 18
 %define name smeserver-dovecot
 
 
@@ -41,6 +41,9 @@ Configure the dovecot IMAP server with sieve scripts support,
 quota, ACL, extended logging, master user
 
 %changelog
+* Mon Nov 03 2025 Jean-Philippe Pialasse <jpp@koozali.org> 11.0.0-18.sme
+- set recipient_delimiter to dash [SME: 13261]
+
 * Tue Mar 18 2025 Jean-Philippe Pialasse <jpp@koozali.org> 11.0.0-17.sme
 - handle dhparam via template [SME: 12965]