On Tue, Aug 04, 2020 at 05:47:35PM -0300, SysAdmin EM wrote: > > If you do believe there's actually a problem, i.e. something actually > > goes wrong as a result of trying to delivery 4XX failures on a second MX > > host, please explain what it is that does not work the way it should. > > I think I understood what I need, is it possible to send an email defer > when I receive a greylist error? I thought that with the command > "queue_run_delay" I could solve this but not.
No queue_run_delay has nothing to do with whether a second MX host is tried when the first responds with a 4XX error. It just controls how often qmgr(8) scans the deferred queue. Since you've not (yet?) explained what problem you're trying to solve, I'm not (yet) prepared to offer a (half-baked) solution. -- VIktor.