+/**
+ * modest_tny_msg_estimate_size:
+ * @plain_body: a string
+ * @html_body: a string
+ * @parts_number: a gint (number of additional parts)
+ * @parts_size: a guint64 (sum of size of the additional parts)
+ *
+ * Estimates the size of the resulting message obtained from the size of the body
+ * parts, and adding the estimation of size headers.
+ */
+guint64
+modest_tny_msg_estimate_size (const gchar *plain_body, const gchar *html_body,
+ guint64 parts_count,
+ guint64 parts_size);
+
+/**
+ * modest_tny_msg_get_all_recipients_list:
+ * @header: a #TnyHeader
+ *
+ * Obtains a list of all the addresses available in @header.
+ *
+ * Returns: a newly allocated #GSList of strings. Caller should free strings and list.
+ */
+GSList *
+modest_tny_msg_header_get_all_recipients_list (TnyHeader *header);
+
+/**
+ * modest_tny_msg_get_all_recipients_list:
+ * @msg: a #TnyMsg
+ *
+ * Obtains a list of all the addresses available in a message header.
+ *
+ * Returns: a newly allocated #GSList of strings. Caller should free strings and list.
+ */
+GSList *
+modest_tny_msg_get_all_recipients_list (TnyMsg *msg);