https://bugs.exim.org/show_bug.cgi?id=2518
--- Comment #3 from Jeremy Harris <jgh146exb@???> ---
> Unfortunately exim's daemon_go() unconditionally sets the global tcp_fastoption_ok > to TRUE if TCP_FASTOPEN is defined.
... and then unsets it if a setsockopt(..., TCP_FASTOPEN...) on any listening
socket fails. So presumably that call is not failing for you? Check with
a debug-enabled run of the daemon starting up; look for "setsockopt".
"src/daemon.c" line 1537.
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