I'm hoping that the particular point you're getting at will be rendered moot by the spam filters and RBLs in Zimbra, which is a question I forgot to, or didn't think to ask originally... that is will ZCS be filtering as spam on the backup MX? I imagine RBL would come into play since that happens way before content filtering.
If somebody sends non-spam to an invalid address I'm sure they'd like to know, but spam should get silently dropped as it does now. |