There are many emails that DAP sends out, including, but not limited to...

- Double-optin & Thank-you emails to new members
- Admin notification emails on new sign-ups
- Error notification emails to Admin
- Autoresponder emails
- Broadcast emails

All of these emails are sent from your web host's local email system (a.k.a mail server).

Whatever you enter into the "From Name" and "From Email Id" fields here, is what is used to send those emails as.