Currently this is possible via PhpMyAdmin, likely accessible from your control panel.
Click on the "lm_config" table and hit "Browse", then look at the value in the "admpw" field.
Another way would be by copying the following code into a file in your ListMail directory, ie "recover_password.php":
<?php// show admin password from ListMail$listmail_dir = ".";include($listmail_dir."/config.php");include($listmail_dir."/admin.php");$link = mysql_connect($sqlhost, $sqluser, $sqlpass) or die("Can't connect to MySQL");mysql_selectdb($sqldb) or die("Can't select database, does it exist?");echo "retrieving password.. ";$row = mysql_query("select admpw from $ctable where 1");if(mysql_num_rows($row)>0){ list($pw)=mysql_fetch_row($row); echo " your password is <b>$pw</b><br>";} else { echo "<b> could not read config!</b><br>";}?>
Upload it to your main ListMail folder and browse to it, you should be shown your password.