On 6 Jul 2022, at 10:24, Olaf Hopp (SCC) via Exim-users <exim-users@exim.org> wrote: > When DSN is switched off for a list sympa calls the exim with the args > -oi -odi -oem -f test2-ow...@test2.example.com -- my.n...@example.com > which runs fine. When DSN is enabled the args are > -oi -odi -oem -N success,delay,failure -V00000031 -f > bounce+my.name==a==example.com==test1==3...@test2.example.com -- > my.n...@example.com > which fails since "-N" means "This is a debugging option that inhibits > delivery of a message at the transport level..." > > Is anybody using sympa with DSN enabled lists who can give a hint ?
Sympa wants Sendmail-compatible (and Postfix-compatible) DSN submission at the command line, which Exim can't support, so you must find or write a Sendmail-alike wrapper program or script that injects DSN-enabled messages via SMTP and configure Sympa to use it. You have another problem, though. Sympa controls parallelism of submissions by using the -odi option. Tragically, Exim supports this just fine, but because it doesn’t support DSN submissions via the command line, and also doesn’t allow an SMTP listener daemon to use the -odi option (as Sendmail does), you’re powerless to perform synchronous deliveries of DSN-enabled messages, your best option being immediately queueing such messages and then running them from a queue with some limited number of (dynamically or pre-spawned) queue runners at some fixed low interval. (See main options remote_max_parallel and queue_run_max, and SMTP transport option serialize_hosts.) This comes at a regrettable cost to both latency and system load for polling for messages from the queue and starting enough runners to give good performance without abusing hosts. I humbly submit that Exim is really not the best choice in this (and similar “bulk mail”) situations, although if you want to, you can do it. Cheers, Sabahattin -- ## 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/
