Email notifications from ACS 3

Hi guys,<br/>
<br/>
I'm trying to get the SMTP email notification part of ACS3 working.<br/>
<br/>
Have tried to use a GMail account with no luck due to their security.<br/>
<br/>
Do any of you have details or recommendations for a mail server or service that will work with ACS3 or have any of you managed to get this feature to work?<br/>
<br/>
Cheers<br/>
<br/>
Dave