The best thing to do, is to have the AOL customers themselves, the parents of these girls, complain that they cannot receive email from their daughter's volleyball coach.<edit>changed sport.

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AOL is far more likely to listen to their own customers than they are to listen to you. (Unfortunately.)
Maybe you could make some kind of outline of a letter that the parents could send. Like, a list of pertinent facts and details. (But don't write a form letter for them. You want each one of them to write their own letter from a only a sketched outline of facts that you provide.)
Good luck,