Quite right. My mistake. The root cause in this case was musl libc in the Alpine Linux 3.9 container image, whose syslog call uses dgram only, unlike glibc, which will attempt stream as well. Thanks for pointing me in the right direction.
FWIW, the new CHUNKING support (BDAT command) in Postfix 3.4 works exactly as expected. Thanks for adding it. Cheers, -Lex On Fri, Feb 15, 2019 at 5:09 AM Wietse Venema <wie...@porcupine.org> wrote: > Lex Scarisbrick: > > The 3.4.0-RC2 version of Postfix appears to have dropped support for > > logging via TCP Unix sockets. As recently as 3.3.0 Postfix used a TCP > Unix > > socket to connect to syslog. This is obliquely referenced in the release > > notes: > > Postfix calls the syslog(3) system library function, so if anything > has changed there, complain to your vendor. > > Wietse >