Configuring your mail reader 
I recommend you use 
Thunderbird
 for your mail program. Although I support Outlook  at Nevis, I don't encourage its
use.  Unfortunately, for technical and social reasons, the Microsoft
mail readers are prone to security problems.  Please consider using
a non-Microsoft program instead.
Here are some items to check in your configuration:
 Ports 
You may see a choice of port numbers. Here's a 
quick summary.
If you need some more details:
You can choose 
465 + SSL/TLS  or  
587 + STARTTLS. Always pick 
Normal password for the type of authentication. 
If you're interested: "STARTTLS" means to negotiate a security protocol and (perhaps) use an unencrypted connection if your mail reader doesn't support one. "SSL/TLS" means that there's no negotiation: Use an encrypted connection with the TLS protocol.
There's also a 
mail pictorial guide if you'd like to see screenshots of what 
WilliamSeligman uses.