executing the mailer.
@@ -445,6 +445,7 @@ send_mail(line)
(void) sigemptyset(&set);
(void) sigaddset(&set, SIGCHLD);
(void) sigaddset(&set, SIGPIPE);
(void) sigprocmask(SIG_BLOCK, &set, &oset);
if (pipe(pfd) == -1)
The note is not visible to the blocked user.