Building an E-Mail Horizontal Service
Now we are going to build a horizontal service that supports e-mail messages to be sent by clients and eventually sent out to a Simple Mail Transport Protocol (SMTP) server somewhere on the network. It’s possible that we might want to store the e-mail message before being sent in case the system crashes after a client sends it, but before it can make its way to the SMTP server.
Although it’s not currently a requirement for the e-mails to be sent to anywhere else but the SMTP server, it’s possible it will be a requirement somewhere down the road and we would like to plan for it in our design. The following list summarizes the requirements for the e-mail service for the example auction site:
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