You can always check the header of the email also.
I have full headers showing on my business email accounts. Easily viewable to see the received from lines along with the IP address.
Example from this mornings email from the headers of a phisher email:
From : eBay <****@flixster.com>
Reply-To : bounce@flixster.com
Sent : Thursday, June 8, 2007 1:08 AM
To : **********@**********.com
Subject : message from buyer
Received: from mail2.flixster.com ([209.237.233.42])
How it would appear if I didn't have headers on:
From : eBay
Reply-To : eBay
Sent : Thursday, June 8, 2007 1:08 AM
To : *********@**********.com
Subject : message from buyer
As you all know, Just because it states eBay in the from line doesn't mean its from eBay.
All good advice above. I have just taken it a step further and use the headers in my email. It doesn't take any longer to read my email, just another preventive measure.
If you don't want to set up your email to view headers...you can always just view the headers on individual emails if you have any qualms.
Remember, never click any links!
Good Luck,
Donna