[Rspamd] Add SIEVE_HOST map and skip spoof check for these IPs

data/conf/rspamd/local.d/multimap.conf

@@ -83,3 +83,9 @@ GLOBAL_RCPT_BL {
   prefilter = true;
   action = "reject";
 }
+
+SIEVE_HOST {
+  type = "ip";
+  map = "$LOCAL_CONFDIR/custom/dovecot_trusted.map";
+  symbols_set = ["SIEVE_HOST"];
+}