PHP. Руководство по PHP. 2005
imap_undelete
imap_undelete
Description
bool imap_undelete (resource imap_stream, int msg_number [, int flags])This function removes the deletion flag for a specified message, which is set by imap_delete() or imap_mail_move().
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
See also: imap_delete(), and imap_mail_move().
imap_uid
imap_unsubscribe