I use Gmail to manage my eleven different email accounts. I have all of my accounts set up as mail forwards (e.g. addison@cameronhuff.com forwards to myemail@gmail.com) and then SMTP for outgoing from Gmail. This set up allows me to have all of my different businesses funnelled into one account that's accessible on my phone and computer. When I reply to a message my email will be sent from the email address that it was sent to (and not the Gmail address).
Besides the incredible convenience of managing many email accounts through one, using Gmail gives me Google's anti-spam filters (they're great). Google anti-spam is also a great defence against phishing emails.
