No installation instructions: this port has been deleted.
The package name of this deleted port was: rspamd
===> The following configuration options are available for rspamd-0.3.5:
RSPAMD_GPERF=off (default) "Enable google perf-tools profiling"
RSPAMD_JUDY=off (default) "Enable Judy arrays usage for performance"
RSPAMD_REDIRECTOR=off (default) "Install HTTP redirector"
===> Use 'make config' to modify these settings