Ordinarily, V8 sendmail forces envelope-sender route addresses [28] 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 . |