Emails sending from browser?

[joeyk]

I suggest you go with a third party SMTP here.
There is a previous discussion regarding to this topic:

What tool to use to send millions of e-mails per month

Sorry for the long letter, but I think you need a quick email university here: You can send email from your server, using Postfix or other MTA (mail transport protocol) but a simple server starts with a crappy reputation, so you need to improve by warming up your IP. Just imagine, that your message is delivered by a really bad smelling door to door salesman. People won’t let you in. -> you land in spam. Again: unless you get good reputation, and grow your sending limits gradually. You can …

Good luck.