Can someone explain to me the reason I would need an SMTP relay?
I have an exchange 2003 server on site.
Users access email within the "network" using Outlook 2010.
and outside the office via webmail, outlook.com, and Exchange on iPhone, Blackberry's, mail for exchange on Nokia's and Exchange on HTC's.
Our website sends emails out from one of our email addresses using SMTP.
My question is, do we need an SMTP relay, what does it do, and why do we need it?