On Wed, Sep 24, 2014 at 06:37:41AM -0400, Wietse Venema wrote: > Quanah Gibson-Mount: > > We've had one request so far for RFC 6710 support with Zimbra. Just > > curious if there are any plans on the table for implementation of this RFC > > within Postfix for 2.12 (or later). > > Postfix has no priorities. If you want to schedule different classes > of mail independently, install more Postfix instances.
This said, each transport is a separate scheduling pool of delivery agents. So with: http://www.postfix.org/postconf.5.html#sender_dependent_default_transport_maps one can arrange for some envelope senders, possibly only on the submission port and possibly restricted to particular logins, to be assigned to a dedicated clone of the smtp transport. If some senders send a small volume of high-priority mail, and provided the active queue is not saturated (leaving new email waiting in the "incoming" queue), assigning such senders to a dedicated transport effectively gives them "immediate" priority, provided no "content filter" results in these messages first waiting for scheduling via a shared filter transport. -- Viktor.
