i'm a little confused with the Notification email setup

i'm a little confused with the Notification email setup

Hello Zoho VO team and users.
1st off, my sincere appreciation for a great price of software in VO. Even more astounding is that Zoho allows it's use for free during the trial.
Along with the feedback from the forum users and the top-noch support i've seen on the forum, i have no doubt that VO will continue to improve into a high caliber suite.

Now, for some questions:
1)I've run into an issue of having the (private) group notification send the the emails to everyone in the group. I've also noticed that there are several instances in the admin area to enter the Outgoing mail server address (SMTP):
Settings-General-Mail Accounts
Settings-Admin-System Settings
Which SMTP address does the Group notification use?
(mind you, the SMTP server is an ISP, and not on the same box or LAN as the VO server)

2)what is the defference between these two above SMTP address, and which one is used for other group notifications?

3)When a Group notification is sent, which email address does it go to for the group members? The email address in:
Settings-Admin-All Users-<username>-Mail ID
Settings-Admin-Accounts- Account Name & Email

i'm sure i'll have other questions, as we get more familiar with VO.
Thanks for your time!

-soundwave4