Am 08.09.2012 20:28, schrieb Wietse Venema: > Robert Schetterer: >>> Nobody said that the fallback relay has to another machine. You >>> can and should in many cases configure a second Postfix instance >>> on each machine to be the fallback relay, this solves the greylisting >>> by IP problem, and keeps the fallback load distributed to all the >>> available hardware. >>> >>> In the fallback queue (instance) increase the active queue limits, >>> and delivery agent process limits, since you expect this mail to >>> generate less network traffic per delivery attempt and to incur >>> a larger active queue size due to the longer queue occupancy per >>> message. >>> >>> There is no need to redesign Postfix, in fact getting the junk out >>> of the primary queue is always preferable. >>> >> >> what about fallback relay being a loadbalancer ip , with logic included >> forward by i.e fifty fifty percent balance to other i.e two other >> postfix servers ? This should goal too, and leaves the first server >> power free >> for new jobs > > The issue is not computer power. The issue is that a fall-back MTA > requires a fundamentally different configuration (*). One benefit > of running the fall-back on the same host is that this reuses the > sender IP address, and thereby speeds up IP-based whitelisting > (greylist, postscreen). > > Wietse
ok understood, thx Wietse > > (*) To begin with, one has short timeouts for quick delivery, and > one has long timeouts to push out mail to problematic destinations. > -- Best Regards MfG Robert Schetterer
