Sorry for the long email here. Let me know if anything isn't clear. In the spec, 32.4 sending to a.b.c.example is retried to another mx host. I've had yahoo return a temporary error which says roughly "don't email any of our mx hosts for a while". Yahoo has like 16 mx hosts, and like 100 domains which go to those hosts. I can't encode that into retry rules. I could setup a cronjob which queried all those mx hosts and put them into the exim config and that list would become invalid for some period between the cronjobs when they added a new mx host. I ended up basically making an ahoc queue runner which would do its own retry calculation for yahoo, and made any failure to yahoo freeze a message so my own queue runner could handle it.
That taught me: don't run queue runners in a short interfal, or else it will cause problems with retrying too much. Now, I've come into a situation where I want to run queue runners fast (like every minute) in order to send a lot of mail fast (but slower than I receive it), but I know I can't do that with queue runners without retrying too often. So, I'm setting up 2 exim spools, and 2 daemons, where 1 does fast queue runners that send to a second exim daemon which tries an immediately delivery but has a different spool, which does the default 30 minute queue runners. But that adds a fair bit of unnecessary overhead if exim could just do this with 1 spool, and retry rules that did what I want. So, I'm imagining a new feature that would upon a delivery failure, record the recipient domain, and it's mx hosts, and then for any future delivery which is to that domain or if that domains mx list has any of previously failed hosts, then defer. Am I missing something? -- Ian Kelling | Senior Systems Administrator, Free Software Foundation GPG Key: B125 F60B 7B28 7FF6 A2B7 DF8F 170A F0E2 9542 95DF https://fsf.org | https://gnu.org -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
