Thank you so much for the link Christopher - I will need to look more into that link today.
Previously, I found and used this "Email Sending Disabled: Email sending is disabled which means no outgoing mail will be delivered. You can re-enable email in Configuration > General Settings > Mail." Which should work for us well enough. We really don't need any mail with the rest of the world. We only use WHMCS internally, we are not traditional web host and don't need the rest of the world.
Re: Do you have the Pre-Sales Contact form set to forward to an email address?
Not sure, I need to find it first to learn more about that.
I am guessing I do have that forwarding on now, else I would never have seen it?
Technically, I know I should just get a better understanding of the whole picture though. I will try to do that today.
<hmmm ... I still like my other setting to block all the sending... >
I think I will leave it as that for now. -> or perhaps build exceptions that are allowed to receive?
I don't know for now, let me think about t some more, to see what would work best for all, in most common situations.
Here is what I have for now. let's see what happens now. 2 entire phrases are now blocked.
Greatly appreciate your help.