How can I go about setting things up so I can email a quote, using my business's email address? I assume I need to put in SMTP details, and the farthest I've gotten is opening class.mail.inc that is located in C:\xampp\htdocs\account\reporting\includes. I don't know what I'm looking at or what to edit. Or even if I have the right document open? Or maybe I can edit something in the GUI? But the only thing I can find there is Setup > Company Setup, and then I enter my email address. But I can't find SMTP detail in the GUI.

I just want to send a quote, and the quote coming from my business's email address (so it's actually sent with it, authorized; not a fake email or anything).