# Verify recipients listed in local_rcpt_callout with a callout.
# This is especially handy for forwarding MX hosts (secondary MX or
# mail hubs) of domains that receive a lot of spam to non-existent
# addresses. The only way to check local parts for remote relay
# domains is to use a callout (add /callout), but please read the
# documentation about callouts before doing this.
deny
!acl = acl_whitelist_local_deny
recipients = ${if exists{CONFDIR/local_rcpt_callout}\
{CONFDIR/local_rcpt_callout}\
{}}
!verify = recipient/callout