modules/mail/default.nix

@@ -215,6 +215,7 @@ in
         }
 
 
+        mail_plugins = $mail_plugins listescape
         plugin {
           sieve_plugins = sieve_imapsieve sieve_extprograms
           sieve_global_extensions = +vnd.dovecot.pipe
@@ -230,6 +231,9 @@ in
           imapsieve_mailbox2_from = Spam
           imapsieve_mailbox2_causes = COPY
           imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
+
+          # https://doc.dovecot.org/configuration_manual/plugins/listescape_plugin/
+          listescape_char = "\\"
         }
       '';
     };