Firstly, spammers can't use the addresses to send from, as they are only used for incomming mail. Secondly, they are set, by default, to expire within 6 hours. So after 6 hours the address no longer exists. Therefore, for spammers to be able to send spam to the account, they would first have to know what account is active, then send spam to it within the period in which the account is active. So it is not easy to spam, also, if spam does hit the account, it will not last more than the active period.
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