!verify = sender/callout=postmaster_mailfrom=pmsend@a.domain
deny hosts = V4NET.0.0.9
!verify = sender/callout=fullpostmaster
+ warn !hosts = V4NET.0.0.10
+ condition = ${if def:sender_verify_failure}
+ logwrite = ($sender_verify_failure)
+
deny hosts = V4NET.0.0.10
!verify = recipient/callout=postmaster_mailfrom=pmsend@b.domain,\
use_postmaster,random/defer_ok