mkdir /etc/sv/saslauthd

/etc/sv/saslauthd/run:

#!/bin/sh
exec 2>&1
[ -r ./conf ] && . ./conf
exec saslauthd -d -a pam ${OPTS}
chmod +x /etc/sv/saslauthd/run
ln -s /etc/sv/saslauthd /var/service
sv status saslauthd
run: saslauthd: (pid 26128) 22s

Refs