On Fri, Nov 07, 2025 at 10:15:20PM +0000, Jeremy Harris via Exim-users wrote: > On 2025/11/07 8:54 PM, Marc MERLIN via Exim-users wrote: > > Logs showing when things work, below. Any idea how I can capture this > > better or what could be > > going wrong? > > Actually, that had its own problem: I understand it failed, but it was working as intended, it was spam, the server on the other side wasn't taking connections, it causes callout/callback to fail, and the spam score to go up. All good.
> So, at first sight it's not your problem but theirs. Correct. But this is not cause for a panic log of "Cannot assign requested address" > Going back to the recipient verify defer - Cannot assign requested address... > that would be a problem on your system. It it heavily loaded? My first that's my understanding too, but I can't find why or what. It's not very loaded, it's not a super busy mail server, it has 32000 ports to call out on and nowhere close to using them. > thought would be the assignment of the local port along with the IP being > used for the outbound interface, and the bind syscall failing due to > ephemeral port exhaustion. Any system-wide settings reserving ports > could be reducing the pool available, too (I used to see extreme examples > of that in a previous $JOB, associated with some major software packages...). Some settings google recommended to check: magic:~# cat /proc/sys/net/ipv4/ip_local_port_range 32768 60999 magic:# sysctl -p net.ipv4.tcp_tw_reuse = 1 magic:# cat /proc/sys/net/netfilter/nf_conntrack_count 1321 magic:# cat /proc/sys/net/netfilter/nf_conntrack_max 262144 > How to get more info? Well, there's the ACL-driven speculative debug > facility. > Start debug (to file) early on in the life of a message-handling, and then > discard it later if all has gone well past the roughly-determined danger > point. Oh, I didn't know about that option, will try it out if I can't figure out why/when it's failing. Thanks, Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Home page: http://marc.merlins.org/ -- ## subscription configuration (requires account): ## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/ ## unsubscribe (doesn't require an account): ## [email protected] ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
