I have implement TIP #140 (http://openacs.org/forums/message-view?message_id=3266832) and committed to HEAD.

ns_sendmail and its rollout support are now deprecated and replaced by acs-mail-lite services. However, ns_sendmail is provided as a wrapper to acs_mail_lite::send for backward compatibility. Therefore, rollout support for it is still available through acs-mail-lite one.

Rollout support parameters are now package paremeters instead of config.tcl ones. One of the advantages is that there's no need of restarting the server to change the delivery mode.