F=d
Never enclose route addresses in <> V8.7 and later
Ordinarily, V8 sendmail forces
envelope-sender route addresses[293] to be enclosed in angle brackets. But
beginning with V8.7 sendmail,
angle brackets can be omitted by specifying F=d
.
Under some circumstances, it is possible for these
angle-bracketed addresses to be given to a shell,
causing them to be wrongly viewed as I/O
redirection. This problem is most common with the
UUCP and prog
delivery agents.
[293] * Also see the
DontPruneRoutes
option in DontPruneRoutes on
page 1024, and how route addresses are handled in
rules in Handling Routing Addresses on page
693.
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