> On 30 Mar 2022, at 11:41 am, Nikolaos Milas <nmi...@noa.gr> wrote:
>
> Answering my own question, apparently mail (I cannot determine if ALL of it)
> IS in fact getting delivered, even if not logged in all cases.
>
> Answering to Victor, who replied to me in the meantime and provided valuable
> hints, esp. about the journal, I found that mail that is NOT logged in
> /var/log/maillog IS in fact recorded successfully in the systemd journal!
>
> I was wondering if low I/O performance of the virtual Hard Disk could lead to
> log entries not getting written successfully. This VM features a large
> virtual HD (see specs below) that is apparently associated with low I/O
> performance.
No, slow disks don't typically lose writes, they just slow down the system.
More likely systemd-journald has elected to not write the log entries to disk.
Consider a Linux distribution that does not use systemd, or a recent
version of Postfix that writes its own log files bypassing syslog.
The current state of Linux logging is rather sad...
--
Viktor.
