+(defun nnimap-credentials (address &rest ports)
+ (let (port credentials)
+ ;; Request the credentials from all ports, but only query on the
+ ;; last port if all the previous ones have failed.
+ (while (and (null credentials)
+ (setq port (pop ports)))
+ (setq credentials
+ (auth-source-user-or-password
+ '("login" "password") address port nil (null ports))))
+ credentials))
+