I’m having the same problem with not receiving emails. I know that the PHP mail() function works because I use it with a Contact Form on the site. And I’m only sending it to 8 people so the BCC issue is moot for me.
I contacted my host and they told me that the website would default to using PHP mail(), but if it wasn’t working that I should change the server in my Admin. I’m not aware of any server changes available to me in the Admin!