+(defvar smtpmail-smtp-user)
+
+(defun message-multi-smtp-send-mail ()
+ "Send the current buffer to `message-send-mail-function'.
+Or, if there's a header that specifies a different method, use
+that instead."
+ (let ((method (message-field-value "X-Message-SMTP-Method")))
+ (if (not method)
+ (funcall message-send-mail-function)
+ (message-remove-header "X-Message-SMTP-Method")
+ (setq method (split-string method))
+ (cond
+ ((equal (car method) "sendmail")
+ (message-send-mail-with-sendmail))
+ ((equal (car method) "smtp")
+ (require 'smtpmail)
+ (let ((smtpmail-smtp-server (nth 1 method))
+ (smtpmail-smtp-service (nth 2 method))
+ (smtpmail-smtp-user (or (nth 3 method) smtpmail-smtp-user)))
+ (message-smtpmail-send-it)))
+ (t
+ (error "Unknown method %s" method))))))