+guint64 modest_utils_get_available_space (const gchar *maildir_path);
+
+/**
+ * modest_images_cache_get_id:
+ * @account: a #TnyAccount
+ * @uri: an uri string
+ *
+ * obtains the hash corresponding to an image external resource to be
+ * stored in image cache.
+ *
+ * Returns: a newly allocated string containing the hash key
+ */
+gchar *modest_images_cache_get_id (const gchar *account, const gchar *uri);
+
+
+/**
+ * modest_utils_get_account_name_from_recipient:
+ * @from: the result of a call to tny_header_dup_from
+ *
+ * returns the account name that corresponds to the given from address
+ *
+ * Returns: a newly allocated string containing the account name or
+ * %NULL in case of error
+ */
+gchar *modest_utils_get_account_name_from_recipient (const gchar *from);
+
+void modest_utils_on_entry_invalid_character (ModestValidatingEntry *self,
+ const gchar* character,
+ gpointer user_data);