<div>
Thanks for the quick reply.
</div>


<div>
<div class="content wysiwyg-content">
Can someone explain to me the reason I would need an SMTP relay?<br />
<br />
I have an exchange 2003 server on site.<br />
Users access email within the &quot;network&quot; using Outlook 2010.<br />
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.<br />
<br />
Our website sends emails out from one of our email addresses using SMTP.<br />
<br />
My question is, do we need an SMTP relay, what does it do, and why do we need it?
</div>
</div>


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?

SMTP relay

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.