When the .authinfo file has a user name but not a password, prompt

for the password.

lisp/ChangeLog

@@ -2,6 +2,8 @@
 
 	* mail/smtpmail.el (smtpmail-via-smtp): Make sure we don't send
 	QUIT twice.
+	(smtpmail-try-auth-methods): Require user name and password from
+	auth-source.
 
 2011-06-22  Martin Rudalics  <rudalics@gmx.at>
 

lisp/gnus/auth-source.el

@@ -713,7 +713,8 @@ Returns the deleted entries."
         when (string-match (concat "^" auth-source-magic)
                            (symbol-name sym))
         ;; remove that key
-        do (password-cache-remove (symbol-name sym))))
+        do (password-cache-remove (symbol-name sym)))
+  (setq auth-source-netrc-cache nil))
 
 (defun auth-source-remember (spec found)
   "Remember FOUND search results for SPEC."
@@ -1144,6 +1145,9 @@ See `auth-source-search' for details on SPEC."
          ;; we know (because of an assertion in auth-source-search) that the
          ;; :create parameter is either t or a list (which includes nil)
          (create-extra (if (eq t create) nil create))
+	 (current-data (car (auth-source-search :max 1
+						:host host
+						:port port)))
          (required (append base-required create-extra))
          (file (oref backend source))
          (add "")
@@ -1178,7 +1182,9 @@ See `auth-source-search' for details on SPEC."
     (dolist (r required)
       (let* ((data (aget valist r))
              ;; take the first element if the data is a list
-             (data (auth-source-netrc-element-or-first data))
+             (data (or (auth-source-netrc-element-or-first data)
+		       (plist-get current-data
+				  (intern (format ":%s" r) obarray))))
              ;; this is the default to be offered
              (given-default (aget auth-source-creation-defaults r))
              ;; the default supplementals are simple:

lisp/mail/smtpmail.el

@@ -483,11 +483,14 @@ The list is in preference order.")
           '((user  . "SMTP user at %h: ")
             (secret . "SMTP password for %u@%h: ")))
          (auth-info (car
-		     (auth-source-search :max 1
+		     (auth-source-search
+		      :max 1
 		      :host host
 		      :port (if port
 				(format "%s" port)
 			      "smtp")
+		      :require (and ask-for-password
+				    '(:user :secret))
 		      :create ask-for-password)))
          (user (plist-get auth-info :user))
          (password (plist-get auth-info :secret))