!verify = sender/callout=no_cache
deny hosts = V4NET.0.0.3
!verify = recipient/callout=no_cache
+ deny hosts = V4NET.0.0.7
+ !verify = recipient/callout=no_cache,use_sender,random
deny hosts = V4NET.0.0.5
!verify = sender/callout=no_cache/check_postmaster
deny hosts = V4NET.0.0.6