Michael is frustrated because he has been blocked by Yahoo for sending a lot of email to his friends. Leo says that this is because he reached the daily sending limit. This is a policy to prevent spammers from using Yahoo. Yahoo's Help has more about daily sending limits here: http://help.yahoo.com/kb/index?page=content&y=PROD_MAIL_ML&locale=en_US&id=SLN3353.
Leo advises setting up a Gmail account and using that to collect the yahoo email. He can set this up in gmail's settings. Also, Leo says that if Michael buys a domain name, he can then use any email provider he wants. Then if a free webmail turns him off, he can move to another one and nobody knows the difference.