Document mail-default-headers and an alternative method to send Bcc

to a constant address.

diff --git a/man/sending.texi b/man/sending.texi
index 96b2c3ed7223d0c04dbe9ad85e029b976a569b77..42b2383fcf5b54048cbfb7c74ff9e477847202f9 100644 (file)
--- a/man/sending.texi
+++ b/man/sending.texi
@@ -150,8 +150,11 @@ which should not appear in the header of the message actually sent.
 Copies sent this way are called @dfn{blind carbon copies}.
 
 @vindex mail-self-blind
+@cindex copy of every outgoing message
 To send a blind carbon copy of every outgoing message to yourself, set
-the variable @code{mail-self-blind} to @code{t}.
+the variable @code{mail-self-blind} to @code{t}.  To send a blind carbon
+copy of every message to some other @var{address}, set the variable
+@code{mail-default-headers} to @samp{"Bcc: @var{address}\n"}.
 
 @item FCC
 This field contains the name of one file and directs Emacs to append a
@@ -236,6 +239,11 @@ Use both email address and full name, as in @samp{Elvis Parsley
 Allow the system to insert the @samp{From} field.
 @end table
 
+@vindex mail-default-headers
+  You can force Emacs to insert specific headers into the outgoing
+message by customizing the variable @code{mail-default-headers}.  Its
+value as a string is inserted before you edit the message.
+
 @node Mail Aliases
 @section Mail Aliases
 @cindex mail aliases