What are the determining factors between just mailing a group from your desktop, and creating a formal, hosted list?
There’s a severe penalty for violating the subscribers’ trust: spam complaints.
There are all sorts of other organizations which can benefit from getting the word out to their patrons.
The first thing anyone needs to do before creating an email list is define what the list is for.
If your business relies on someone else’s platform, it’s not really “your business” at all — it’s theirs.
It’s not an obvious thing to all: what exactly is an email list, in this context?