(mail-specify-envelope-from): Initialize to

nil.  Contemporary sendmails issue an X-Authentication-Warning if
the sender is set with `-f.

diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index 542a91e0d2c9402023ee95aca207ec42f2374279..878ce8a49a3535737b836a88be22d4db3927c221 100644 (file)
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -63,7 +63,7 @@ controlled by a separate variable, `mail-specify-envelope-from'."
   :group 'sendmail)
 
 ;;;###autoload
-(defcustom mail-specify-envelope-from t
+(defcustom mail-specify-envelope-from nil
   "*If non-nil, specify the envelope-from address when sending mail.
 The value used to specify it is whatever is found in `user-mail-address'.