Use this element to define a mail test with the
use cases for the sequence are:
a) Class will test that it can successfully send an email.
b) Class will test that it can successfully connect to a mail server and get mailbox contents.
c) Class will test that it can successfully read a new email message from a mail server.
d) Class will test that it can send an email and read that same email from a mail server.
The sequence support a max of one send and one receive server. If each are specified, the complete
sequence is delivery of a message from one mail host to another.