-mail to an SMTP listener daemon. An argument of '\-' causes the mail
-to be written to standard output. Note that fetchmail's
-reconstruction of MAIL FROM and RCPT TO lines is not guaranteed
-correct; the caveats discussed under THE USE AND ABUSE OF MULTIDROP
-MAILBOXES below apply.
+mail to an SMTP listener daemon.
+
+An argument of '\-' causes the SMTP batch to be written to standard
+output, which is of limited use: this only makes sense for debugging,
+because fetchmail's regular output is interspersed on the same channel,
+so this isn't suitable for mail delivery. This special mode may be
+removed in a later release.
+
+Note that fetchmail's reconstruction of MAIL FROM and RCPT TO lines is
+not guaranteed correct; the caveats discussed under THE USE AND ABUSE OF
+MULTIDROP MAILBOXES below apply. This mode has precedence before
+\-\-mda and SMTP/LMTP.
+.TP
+.B \-\-bad\-header {reject|accept}
+(Keyword: bad\-header; since v6.3.15)
+.br
+Specify how fetchmail is supposed to treat messages with bad headers,
+i. e. headers with bad syntax. Traditionally, fetchmail has rejected such
+messages, but some distributors modified fetchmail to accept them. You can now
+configure fetchmail's behaviour per server.
+