Update line 75 of recaperar-password.php from:
$WA_MailObject = WA_SecurityAssist_Definition("yourmailserver.yourdomain.com","25","","","");
to:
$WA_MailObject = WA_SecurityAssist_Definition("","25","","","","");
I'm not sure what the cause of this is, but that should solve it. Did you use an encrypted password? What type of encryption? I'll see if I can reproduce the problem and get a bug logged.