> On Nov 14, 2018, at 12:00 PM, Marek Kozlowski <m.kozlow...@mini.pw.edu.pl>
> wrote:
>
> Maybe there is some cached runtime information for postfix or some broken
> database?
No. The communications sockets don't any such "memory". If they're dropping
packets,
your kernel is fubared, and you need a more reliable O/S. Unless the packet
loss is
due to some sort of security software (SELinux, AppArmor?)...
Postfix unix-domain sockets have worked reliably for 21 years on multiple
Unix-like
operating systems (Solaris, HP-UX, AIX, FreeBSD, NetBSD, OpenBSD, Linux,
MacOS/X).
If your system is having trouble delivering 1-byte messages over a unix-domain
socket,
something is quite wrong with the system rather than Postfix.
The only thing to check is that you have nothing peculiar in master.cf. All
the entries should have type (2nd column) either "inet" or "unix", you should
not be using "fifo".
--
Viktor.
