> Which is why on outbound Postfix instances I tend to set: > > delay_warning_time = 2h,
I'm interested by this functionality but I don't want the external senders to be informed of local delivery problems. And setting 2 postfix instances seems heavy for a small email server. Is it possible to set the delay_warning_time and confirm_delay_cleared parameters in the master.cf file for submission only ? Given http://www.postfix.org/smtpd.8.html, I think no. But is it something conceivable ? Guillaume Le 15/01/2020 à 22:56, Viktor Dukhovni a écrit : > On Wed, Jan 15, 2020 at 09:32:43PM +0100, azu...@pobox.sk wrote: > >>>>> Why? Someone was drunk and sent a bad email? Is "postsuper -d" >>>>> not sufficient? >>>>> >>>>> Wietse >>>> >>>> Use case: Users are sending undeliverable e-mails which are filling up >>>> mail queue and you must wait few days until they are bounced. You >>>> cannot simply delete them because, if you do, sender won't know it's >>>> undeliverable and will send something to that address again in the >>>> future. > > When you say "filling up mail queue" is that actually a problem, or just > something you could simply ignore with no ill-effect? The mail will > bounce eventually after (by default) ~5 days. > >>> Why not set a smaller maximal_queue_lifetime? > > As Wietse suggests, you can typically set the queue lifetime a bit > shorter (perhaps 2 days, but generally not much shorter, allowing > remote sites to fix problems they did not notice immediately). > With 5 days, you can wait out an outage that lasts across a long > holiday weekend. With 2 days, an outage that does not get noticed > until the next morning and takes a day to fix. > >> Because there can be legitimate situations where it is good to keep >> e-mails longer in the queue (full mailbox, temporary outage of >> recipient server [which can take days] etc.). > > Which is why on outbound Postfix instances I tend to set: > > delay_warning_time = 2h, > > giving my own senders generally same day notice of email that'll likely > never make it, but retries continue for ~2-5 days. In commercial > deployments serving more than a handful of users, I always separate > inbound and outbound processing into separate Postfix instances. > The inbound queue has the default "delay_warning_time = 0h", which > does not leak internal hiccups to outsiders. >
