Hi all
i'm the administrator of one zimbra server and i have an special issue, we use the zimbra server to send mails with a system to many destinations and what i need is

block all "outgoing mails" from zimbra to siidte@sii.cl
BUT is very important not reject mails from siidte@sii.cl
siidte is just a SENDING account from sii.cl and not allow receibe mails the problem is that many times siidte send mails to one or more accounts of my zimbra server that not exist
then zimbra respond with delivery status notification to siidte and then sii.cl block my IP with the error too many invalid recipients

so this is why i need to allow the reception from siidte@sii.cl and block the sending mails from my zimbra to siidte

how can i do this?