Initial commit.
Added outline of what programme has to do.
Added this as comments.
Added method to ensure "MAIL FROM" entered.
The code compares characters from the user's input and the string "MAIL
FROM" to ensure it's correctly entered.
Added and test email checking method.
The method ensures there aren't any spaces in the email address and no
more than 1 @ character.
Corrected email testing method.
Added test to ensure there's at least one @ symbol.
Cleaned up error/ok messages.
Made it so these are printed only once, depending on the outcome of the
FROM TO and email check tests.
Added more code to check RCPT TO entered correctly
Broke down email test method.
Created several smaller methods to test number and position of @'s and
existence of spaces.
Added module to test DATA command entered correct
Added method to read user's entire email.
Added method to print final string.
That is, it advises who is sending/receiving the email, echoes the email
text, and says when it's done.