for Postfix, switch to non-Postfix mailbox store
Original LP Author: Sumana Harihareswara , LP Link: https://bugs.launchpad.net/bugs/1414177
For Postfix, switch to http://www.postfix.org/VIRTUAL_README.html#in_virtual_other Non-Postfix mailbox store: separate domains, non-UNIX accounts virtual domains and maildir delivery by default. Delivery mechanics for other MTAs may or may not change.
From http://wiki.mailman.psf.io/DEV/Mailman%203.0?action=diff&rev2=30&rev1=28 -- a TODO for the Mailman 3.x series.