Thanks for the info. I had already read the policy pages; I needed that info before I ever started the project.
So anyway - I was able to use the PHP mail() command to send email to discrete email addresses - so far, so good.
I'm still having a problem with the announcement list, however. I configured a list, added my own email address, confirmed it via the email I received, and verified that it's in the list on the Announcement list management page.
However, if I send an email via the PHP mail() command, using the announcement list (full @ path) as the recipient, it doesn't get delivered.
Am I doing something incorrect here?