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-rw-r--r--nixos/modules/services/mail/postfix.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 29e0cf7a8829..e8beba4b3586 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -77,7 +77,8 @@ let
       smtpd_tls_key_file = ${cfg.sslKey}
 
       smtpd_use_tls = yes
-
+    ''
+    + optionalString (cfg.recipientDelimiter != "") ''
       recipient_delimiter = ${cfg.recipientDelimiter}
     ''
     + optionalString (cfg.virtual != "") ''