How can I track an email sent from my website?

You can view all emails sent, and track if they have been delivered and/or opened by browsing to "Reports" > "Email Tracker":

You can use the "Search" functionality in the "Manage" menu to locate emails by Message ID, the date sent, Customer ID, first or last name, Customer Email, or who it was sent by:

Clicking on the ID shows you the trail of if, and how often, the email has been viewed:

And clicking on the "To" name will show all emails sent to that customer.

A warning triangle in the "Delivered" column indicates there was an issue with delivery and the customers email address should be verified before trying to resend:

Browse to the "Customer" report  and search for the relevant customer. This will show if the customer has 'Unsubscribed' from mailing lists, or if they have 'Complained' (i.e. reported the sending email address as Spam) or if the email has 'Bounced' (this means it is an invalid email address or it is a non-existent mailbox):

You can then select from the "Manage menu" for the relevant customer if you wish to remove the customer from any or all of these lists, which will be shown as appropriate:

A modal window will appear advising that the customers email address should not be removed from the suppression list unless you have received a request from them to do so: