I know that you send entries to [email protected]. but what do you put in the Subject line? Is it, for example, 4717 or Crossword 4717.
I am a bit concerned that if the subject line is not strictly correct then the email may not finish up in the correct place.
Given that the email address is used solely for crossword entries, it probably doesn't really matter what you put in the subject line. However the ST website refers to "the name and number of the competition in the subject line":
http://www.thesundaytimes.co.uk/sto/newsreview/brainpower/article585343.ece
So (using your example) "Crossword 4717" would seem to be correct.